diff --git a/libgambatte/libretro-common/compat/compat_strl.c b/libgambatte/libretro-common/compat/compat_strl.c
index 3172310..3a6392c 100644
--- a/libgambatte/libretro-common/compat/compat_strl.c
+++ b/libgambatte/libretro-common/compat/compat_strl.c
@@ -60,10 +60,3 @@ size_t strlcat(char *dest, const char *source, size_t size)
    return len + strlcpy(dest, source, size);
 }
 #endif
-
-char *strldup(const char *s, size_t n)
-{
-   char *dst = (char*)malloc(sizeof(char) * (n + 1));
-   strlcpy(dst, s, n);
-   return dst;
-}
diff --git a/libgambatte/libretro-common/compat/fopen_utf8.c b/libgambatte/libretro-common/compat/fopen_utf8.c
index 85abb59..384657b 100644
--- a/libgambatte/libretro-common/compat/fopen_utf8.c
+++ b/libgambatte/libretro-common/compat/fopen_utf8.c
@@ -37,27 +37,28 @@
 void *fopen_utf8(const char * filename, const char * mode)
 {
 #if defined(LEGACY_WIN32)
-   FILE             *ret = NULL;
    char * filename_local = utf8_to_local_string_alloc(filename);
-
-   if (!filename_local)
-      return NULL;
-   ret = fopen(filename_local, mode);
    if (filename_local)
+   {
+      FILE *ret          = fopen(filename_local, mode);
       free(filename_local);
-   return ret;
+      return ret;
+   }
 #else
-   wchar_t * filename_w = utf8_to_utf16_string_alloc(filename);
-   wchar_t * mode_w = utf8_to_utf16_string_alloc(mode);
-   FILE* ret = NULL;
-
-   if (filename_w && mode_w)
-      ret = _wfopen(filename_w, mode_w);
+   wchar_t * filename_w  = utf8_to_utf16_string_alloc(filename);
    if (filename_w)
+   {
+      FILE    *ret       = NULL;
+      wchar_t *mode_w    = utf8_to_utf16_string_alloc(mode);
+      if (mode_w)
+      {
+         ret             = _wfopen(filename_w, mode_w);
+         free(mode_w);
+      }
       free(filename_w);
-   if (mode_w)
-      free(mode_w);
-   return ret;
+      return ret;
+   }
 #endif
+   return NULL;
 }
 #endif
diff --git a/libgambatte/libretro-common/encodings/encoding_utf.c b/libgambatte/libretro-common/encodings/encoding_utf.c
index 2760824..f9c594d 100644
--- a/libgambatte/libretro-common/encodings/encoding_utf.c
+++ b/libgambatte/libretro-common/encodings/encoding_utf.c
@@ -51,9 +51,12 @@ static unsigned leading_ones(uint8_t c)
    return ones;
 }
 
-/* Simple implementation. Assumes the sequence is
- * properly synchronized and terminated. */
-
+/**
+ * utf8_conv_utf32:
+ *
+ * Simple implementation. Assumes the sequence is
+ * properly synchronized and terminated.
+ **/
 size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
       const char *in, size_t in_size)
 {
@@ -79,7 +82,7 @@ size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
       for (i = 0; i < extra; i++, in++, shift -= 6)
          c |= (*in & 0x3f) << shift;
 
-      *out++ = c;
+      *out++   = c;
       in_size -= 1 + extra;
       out_chars--;
       ret++;
@@ -88,6 +91,11 @@ size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
    return ret;
 }
 
+/**
+ * utf16_conv_utf8:
+ *
+ * Leaf function.
+ **/
 bool utf16_conv_utf8(uint8_t *out, size_t *out_chars,
      const uint16_t *in, size_t in_size)
 {
@@ -148,16 +156,20 @@ bool utf16_conv_utf8(uint8_t *out, size_t *out_chars,
    return false;
 }
 
-/* Acts mostly like strlcpy.
+/**
+ * utf8cpy:
+ *
+ * Acts mostly like strlcpy.
  *
  * Copies the given number of UTF-8 characters,
- * but at most d_len bytes.
+ * but at most @d_len bytes.
  *
- * Always NULL terminates.
- * Does not copy half a character.
+ * Always NULL terminates. Does not copy half a character.
+ * @s is assumed valid UTF-8.
+ * Use only if @chars is considerably less than @d_len. 
  *
- * Returns number of bytes. 's' is assumed valid UTF-8.
- * Use only if 'chars' is considerably less than 'd_len'. */
+ * @return Number of bytes. 
+ **/
 size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars)
 {
    const uint8_t *sb     = (const uint8_t*)s;
@@ -186,6 +198,11 @@ size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars)
    return sb-sb_org;
 }
 
+/**
+ * utf8skip:
+ *
+ * Leaf function
+ **/
 const char *utf8skip(const char *str, size_t chars)
 {
    const uint8_t *strb = (const uint8_t*)str;
@@ -204,6 +221,11 @@ const char *utf8skip(const char *str, size_t chars)
    return (const char*)strb;
 }
 
+/**
+ * utf8len:
+ *
+ * Leaf function.
+ **/
 size_t utf8len(const char *string)
 {
    size_t ret = 0;
@@ -220,7 +242,15 @@ size_t utf8len(const char *string)
    return ret;
 }
 
-/* Does not validate the input, returns garbage if it's not UTF-8. */
+/** 
+ * utf8_walk:
+ *
+ * Does not validate the input.
+ *
+ * Leaf function.
+ *
+ * @return Returns garbage if it's not UTF-8.
+ **/
 uint32_t utf8_walk(const char **string)
 {
    uint8_t first = UTF8_WALKBYTE(string);
@@ -248,24 +278,23 @@ static bool utf16_to_char(uint8_t **utf_data,
       size_t *dest_len, const uint16_t *in)
 {
    unsigned len    = 0;
-
    while (in[len] != '\0')
       len++;
-
    utf16_conv_utf8(NULL, dest_len, in, len);
    *dest_len  += 1;
-   *utf_data   = (uint8_t*)malloc(*dest_len);
-   if (*utf_data == 0)
-      return false;
-
-   return utf16_conv_utf8(*utf_data, dest_len, in, len);
+   if ((*utf_data = (uint8_t*)malloc(*dest_len)) != 0)
+      return utf16_conv_utf8(*utf_data, dest_len, in, len);
+   return false;
 }
 
+/**
+ * utf16_to_char_string:
+ **/
 bool utf16_to_char_string(const uint16_t *in, char *s, size_t len)
 {
-   size_t     dest_len  = 0;
-   uint8_t *utf16_data  = NULL;
-   bool            ret  = utf16_to_char(&utf16_data, &dest_len, in);
+   size_t     dest_len     = 0;
+   uint8_t *utf16_data     = NULL;
+   bool            ret     = utf16_to_char(&utf16_data, &dest_len, in);
 
    if (ret)
    {
@@ -274,13 +303,17 @@ bool utf16_to_char_string(const uint16_t *in, char *s, size_t len)
    }
 
    free(utf16_data);
-   utf16_data = NULL;
+   utf16_data              = NULL;
 
    return ret;
 }
 
 #if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
-/* Returned pointer MUST be freed by the caller if non-NULL. */
+/**
+ * mb_to_mb_string_alloc:
+ *
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
 static char *mb_to_mb_string_alloc(const char *str,
       enum CodePage cp_in, enum CodePage cp_out)
 {
@@ -300,10 +333,8 @@ static char *mb_to_mb_string_alloc(const char *str,
    if (!path_buf_wide_len)
       return strdup(str);
 
-   path_buf_wide = (wchar_t*)
-      calloc(path_buf_wide_len + sizeof(wchar_t), sizeof(wchar_t));
-
-   if (path_buf_wide)
+   if ((path_buf_wide = (wchar_t*)
+      calloc(path_buf_wide_len + sizeof(wchar_t), sizeof(wchar_t))))
    {
       MultiByteToWideChar(cp_in, 0,
             str, -1, path_buf_wide, path_buf_wide_len);
@@ -347,45 +378,49 @@ static char *mb_to_mb_string_alloc(const char *str,
 }
 #endif
 
-/* Returned pointer MUST be freed by the caller if non-NULL. */
+/**
+ * utf8_to_local_string_alloc:
+ *
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
 char* utf8_to_local_string_alloc(const char *str)
 {
    if (str && *str)
-   {
 #if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
       return mb_to_mb_string_alloc(str, CODEPAGE_UTF8, CODEPAGE_LOCAL);
 #else
-      /* assume string needs no modification if not on Windows */
-      return strdup(str);
+      return strdup(str); /* Assume string needs no modification if not on Windows */
 #endif
-   }
    return NULL;
 }
 
-/* Returned pointer MUST be freed by the caller if non-NULL. */
-char* local_to_utf8_string_alloc(const char *str)
+/**
+ * local_to_utf8_string_alloc:
+ *
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
+char *local_to_utf8_string_alloc(const char *str)
 {
-   if (str && *str)
-   {
+	if (str && *str)
 #if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
-      return mb_to_mb_string_alloc(str, CODEPAGE_LOCAL, CODEPAGE_UTF8);
+		return mb_to_mb_string_alloc(str, CODEPAGE_LOCAL, CODEPAGE_UTF8);
 #else
-      /* assume string needs no modification if not on Windows */
-      return strdup(str);
+      return strdup(str); /* Assume string needs no modification if not on Windows */
 #endif
-   }
-   return NULL;
+	return NULL;
 }
 
-/* Returned pointer MUST be freed by the caller if non-NULL. */
+/**
+ * utf8_to_utf16_string_alloc:
+ * 
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
 wchar_t* utf8_to_utf16_string_alloc(const char *str)
 {
 #ifdef _WIN32
    int len        = 0;
-   int out_len    = 0;
 #else
    size_t len     = 0;
-   size_t out_len = 0;
 #endif
    wchar_t *buf   = NULL;
 
@@ -393,63 +428,55 @@ wchar_t* utf8_to_utf16_string_alloc(const char *str)
       return NULL;
 
 #ifdef _WIN32
-   len = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
-
-   if (len)
+   if ((len = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0)))
    {
-      buf = (wchar_t*)calloc(len, sizeof(wchar_t));
-
-      if (!buf)
+      if (!(buf = (wchar_t*)calloc(len, sizeof(wchar_t))))
          return NULL;
 
-      out_len = MultiByteToWideChar(CP_UTF8, 0, str, -1, buf, len);
+      if ((MultiByteToWideChar(CP_UTF8, 0, str, -1, buf, len)) < 0)
+      {
+         free(buf);
+         return NULL;
+      }
    }
    else
    {
-      /* fallback to ANSI codepage instead */
-      len = MultiByteToWideChar(CP_ACP, 0, str, -1, NULL, 0);
-
-      if (len)
+      /* Fallback to ANSI codepage instead */
+      if ((len = MultiByteToWideChar(CP_ACP, 0, str, -1, NULL, 0)))
       {
-         buf = (wchar_t*)calloc(len, sizeof(wchar_t));
-
-         if (!buf)
+         if (!(buf = (wchar_t*)calloc(len, sizeof(wchar_t))))
             return NULL;
 
-         out_len = MultiByteToWideChar(CP_ACP, 0, str, -1, buf, len);
+         if ((MultiByteToWideChar(CP_ACP, 0, str, -1, buf, len)) < 0)
+         {
+            free(buf);
+            return NULL;
+         }
       }
    }
-
-   if (out_len < 0)
-   {
-      free(buf);
-      return NULL;
-   }
 #else
    /* NOTE: For now, assume non-Windows platforms' locale is already UTF-8. */
-   len = mbstowcs(NULL, str, 0) + 1;
-
-   if (len)
+   if ((len = mbstowcs(NULL, str, 0) + 1))
    {
-      buf = (wchar_t*)calloc(len, sizeof(wchar_t));
-
-      if (!buf)
+      if (!(buf = (wchar_t*)calloc(len, sizeof(wchar_t))))
          return NULL;
 
-      out_len = mbstowcs(buf, str, len);
-   }
-
-   if (out_len == (size_t)-1)
-   {
-      free(buf);
-      return NULL;
+      if ((mbstowcs(buf, str, len)) == (size_t)-1)
+      {
+         free(buf);
+         return NULL;
+      }
    }
 #endif
 
    return buf;
 }
 
-/* Returned pointer MUST be freed by the caller if non-NULL. */
+/**
+ * utf16_to_utf8_string_alloc:
+ *
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
 char* utf16_to_utf8_string_alloc(const wchar_t *str)
 {
 #ifdef _WIN32
@@ -465,20 +492,17 @@ char* utf16_to_utf8_string_alloc(const wchar_t *str)
 #ifdef _WIN32
    {
       UINT code_page = CP_UTF8;
-      len            = WideCharToMultiByte(code_page,
-            0, str, -1, NULL, 0, NULL, NULL);
 
       /* fallback to ANSI codepage instead */
-      if (!len)
+      if (!(len = WideCharToMultiByte(code_page,
+            0, str, -1, NULL, 0, NULL, NULL)))
       {
          code_page   = CP_ACP;
          len         = WideCharToMultiByte(code_page,
                0, str, -1, NULL, 0, NULL, NULL);
       }
 
-      buf = (char*)calloc(len, sizeof(char));
-
-      if (!buf)
+      if (!(buf = (char*)calloc(len, sizeof(char))))
          return NULL;
 
       if (WideCharToMultiByte(code_page,
@@ -491,13 +515,9 @@ char* utf16_to_utf8_string_alloc(const wchar_t *str)
 #else
    /* NOTE: For now, assume non-Windows platforms' 
     * locale is already UTF-8. */
-   len = wcstombs(NULL, str, 0) + 1;
-
-   if (len)
+   if ((len = wcstombs(NULL, str, 0) + 1))
    {
-      buf = (char*)calloc(len, sizeof(char));
-
-      if (!buf)
+      if (!(buf = (char*)calloc(len, sizeof(char))))
          return NULL;
 
       if (wcstombs(buf, str, len) == (size_t)-1)
diff --git a/libgambatte/libretro-common/file/file_path.c b/libgambatte/libretro-common/file/file_path.c
index fc11270..c696ff0 100644
--- a/libgambatte/libretro-common/file/file_path.c
+++ b/libgambatte/libretro-common/file/file_path.c
@@ -24,13 +24,13 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <errno.h>
+#include <locale.h>
 
 #include <sys/stat.h>
 
 #include <boolean.h>
 #include <file/file_path.h>
-#include <retro_assert.h>
+#include <retro_miscellaneous.h>
 #include <string/stdstring.h>
 #include <time/rtime.h>
 
@@ -69,6 +69,103 @@
 
 #endif
 
+/* Time format strings with AM-PM designation require special
+ * handling due to platform dependence */
+void strftime_am_pm(char *s, size_t len, const char* format,
+      const void *ptr)
+{
+   char *local = NULL;
+   const struct tm *timeptr = (const struct tm*)ptr;
+
+   /* Ensure correct locale is set
+    * > Required for localised AM/PM strings */
+   setlocale(LC_TIME, "");
+
+   strftime(s, len, format, timeptr);
+#if !(defined(__linux__) && !defined(ANDROID))
+   if ((local = local_to_utf8_string_alloc(s)))
+   {
+      if (!string_is_empty(local))
+         strlcpy(s, local, len);
+
+      free(local);
+      local = NULL;
+   }
+#endif
+}
+
+/**
+ * Create a new linked list with one node in it
+ * The path on this node will be set to NULL
+**/
+struct path_linked_list* path_linked_list_new(void)
+{
+   struct path_linked_list* paths_list = (struct path_linked_list*)malloc(sizeof(*paths_list));
+   paths_list->next = NULL;
+   paths_list->path = NULL;
+   return paths_list;
+}
+
+/**
+ * path_linked_list_free:
+ *
+ * Free the entire linked list
+ **/
+void path_linked_list_free(struct path_linked_list *in_path_linked_list)
+{
+   struct path_linked_list *node_tmp = (struct path_linked_list*)in_path_linked_list;
+   while (node_tmp)
+   {
+      struct path_linked_list *hold = NULL;
+      if (node_tmp->path)
+         free(node_tmp->path);
+      hold     = (struct path_linked_list*)node_tmp;
+      node_tmp = node_tmp->next;
+      if (hold)
+         free(hold);
+   }
+}
+
+/**
+ * path_linked_list_add_path:
+ *
+ * Add a node to the linked list with this path
+ * If the first node's path if it's not yet set the path
+ * on this node instead
+**/
+void path_linked_list_add_path(struct path_linked_list *in_path_linked_list,
+      char *path)
+{
+    /* If the first item does not have a path this is
+      a list which has just been created, so we just fill 
+      the path for the first item
+   */
+   if (!in_path_linked_list->path)
+      in_path_linked_list->path = strdup(path);
+   else
+   {  
+      struct path_linked_list *node = (struct path_linked_list*) malloc(sizeof(*node));
+
+      if (node)
+      {
+         struct path_linked_list *head = in_path_linked_list;
+
+         node->next                    = NULL;
+         node->path                    = strdup(path);
+
+         if (head)
+         {
+            while (head->next)
+               head        = head->next;
+
+            head->next     = node;
+         }
+         else
+            in_path_linked_list = node;
+      }
+   }
+}
+
 /**
  * path_get_archive_delim:
  * @path               : path
@@ -76,38 +173,24 @@
  * Find delimiter of an archive file. Only the first '#'
  * after a compression extension is considered.
  *
- * Returns: pointer to the delimiter in the path if it contains
+ * @return pointer to the delimiter in the path if it contains
  * a path inside a compressed file, otherwise NULL.
- */
+ **/
 const char *path_get_archive_delim(const char *path)
 {
-   const char *last_slash = find_last_slash(path);
-   const char *delim      = NULL;
    char buf[5];
-
-   buf[0] = '\0';
-
-   /* We search for delimiters after the last slash
-    * in the file path to avoid capturing delimiter
-    * characters in any parent directory names.
-    * If there are no slashes in the file name, then
-    * the path is just the file basename - in this
-    * case we search the path in its entirety */
-   if (!last_slash)
-      last_slash = path;
-
    /* Find delimiter position
     * > Since filenames may contain '#' characters,
     *   must loop until we find the first '#' that
     *   is directly *after* a compression extension */
-   delim = strchr(last_slash, '#');
+   const char *delim      = strchr(path, '#');
 
    while (delim)
    {
       /* Check whether this is a known archive type
        * > Note: The code duplication here is
        *   deliberate, to maximise performance */
-      if (delim - last_slash > 4)
+      if (delim - path > 4)
       {
          strlcpy(buf, delim - 4, sizeof(buf));
          buf[4] = '\0';
@@ -115,12 +198,12 @@ const char *path_get_archive_delim(const char *path)
          string_to_lower(buf);
 
          /* Check if this is a '.zip', '.apk' or '.7z' file */
-         if (string_is_equal(buf,     ".zip") ||
-             string_is_equal(buf,     ".apk") ||
-             string_is_equal(buf + 1, ".7z"))
+         if (   string_is_equal(buf,     ".zip")
+             || string_is_equal(buf,     ".apk")
+             || string_is_equal(buf + 1, ".7z"))
             return delim;
       }
-      else if (delim - last_slash > 3)
+      else if (delim - path > 3)
       {
          strlcpy(buf, delim - 3, sizeof(buf));
          buf[3] = '\0';
@@ -146,16 +229,36 @@ const char *path_get_archive_delim(const char *path)
  * Gets extension of file. Only '.'s
  * after the last slash are considered.
  *
- * Returns: extension part from the path.
- */
+ * @return extension part from the path.
+ **/
 const char *path_get_extension(const char *path)
 {
    const char *ext;
-   if (!string_is_empty(path) && ((ext = strrchr(path_basename(path), '.'))))
+   if (!string_is_empty(path) && ((ext = (char*)strrchr(path_basename(path), '.'))))
       return ext + 1;
    return "";
 }
 
+/**
+ * path_get_extension_mutable:
+ * @path               : path
+ *
+ * Specialized version of path_get_extension(). Return
+ * value is mutable.
+ *
+ * Gets extension of file. Only '.'s
+ * after the last slash are considered.
+ *
+ * @return extension part from the path.
+ **/
+char *path_get_extension_mutable(const char *path)
+{
+   char *ext = NULL;
+   if (!string_is_empty(path) && ((ext = (char*)strrchr(path_basename(path), '.'))))
+      return ext;
+   return NULL;
+}
+
 /**
  * path_remove_extension:
  * @path               : path
@@ -164,12 +267,12 @@ const char *path_get_extension(const char *path)
  * text after and including the last '.'.
  * Only '.'s after the last slash are considered.
  *
- * Returns:
+ * @return
  * 1) If path has an extension, returns path with the
  *    extension removed.
  * 2) If there is no extension, returns NULL.
  * 3) If path is empty or NULL, returns NULL
- */
+ **/
 char *path_remove_extension(char *path)
 {
    char *last = !string_is_empty(path)
@@ -187,16 +290,15 @@ char *path_remove_extension(char *path)
  *
  * Checks if path is a compressed file.
  *
- * Returns: true (1) if path is a compressed file, otherwise false (0).
+ * @return true if path is a compressed file, otherwise false.
  **/
 bool path_is_compressed_file(const char* path)
 {
    const char *ext = path_get_extension(path);
    if (!string_is_empty(ext))
-      if (  string_is_equal_noncase(ext, "zip") ||
-            string_is_equal_noncase(ext, "apk") ||
-            string_is_equal_noncase(ext, "7z"))
-         return true;
+      return (   string_is_equal_noncase(ext, "zip")
+              || string_is_equal_noncase(ext, "apk")
+              || string_is_equal_noncase(ext, "7z"));
    return false;
 }
 
@@ -220,53 +322,45 @@ bool path_is_compressed_file(const char* path)
  * out_path = "/foo/bar/baz/boo.asm"
  * E.g.: in_path = "/foo/bar/baz/boo.c", replace = ""     =>
  * out_path = "/foo/bar/baz/boo"
+ *
+ * @return Length of the string copied into @out
  */
-void fill_pathname(char *out_path, const char *in_path,
+size_t fill_pathname(char *out_path, const char *in_path,
       const char *replace, size_t size)
 {
+   size_t _len;
    char tmp_path[PATH_MAX_LENGTH];
-   char *tok                      = NULL;
-
-   tmp_path[0] = '\0';
-
+   char *tok   = NULL;
    strlcpy(tmp_path, in_path, sizeof(tmp_path));
    if ((tok = (char*)strrchr(path_basename(tmp_path), '.')))
       *tok = '\0';
 
-   fill_pathname_noext(out_path, tmp_path, replace, size);
+   _len  = strlcpy(out_path, tmp_path, size);
+   _len += strlcpy(out_path + _len, replace, size - _len);
+   return _len;
 }
 
+
 /**
- * fill_pathname_noext:
- * @out_path           : output path
- * @in_path            : input  path
- * @replace            : what to replace
- * @size               : buffer size of output path
+ * find_last_slash:
+ * @str                : path
+ * @size               : size of path
  *
- * Appends a filename extension 'replace' to 'in_path', and outputs
- * result in 'out_path'.
- *
- * Assumes in_path has no extension. If an extension is still
- * present in 'in_path', it will be ignored.
- *
- */
-size_t fill_pathname_noext(char *out_path, const char *in_path,
-      const char *replace, size_t size)
-{
-   strlcpy(out_path, in_path, size);
-   return strlcat(out_path, replace, size);
-}
+ * Find last slash in path. Tries to find
+ * a backslash as used for Windows paths,
+ * otherwise checks for a regular slash.
 
+ * @return pointer to last slash/backslash found in @str.
+ **/
 char *find_last_slash(const char *str)
 {
    const char *slash     = strrchr(str, '/');
-#ifdef _WIN32
    const char *backslash = strrchr(str, '\\');
 
    if (!slash || (backslash > slash))
       return (char*)backslash;
-#endif
-   return (char*)slash;
+   else
+      return (char*)slash;
 }
 
 /**
@@ -277,24 +371,20 @@ char *find_last_slash(const char *str)
  * Assumes path is a directory. Appends a slash
  * if not already there.
  **/
-void fill_pathname_slash(char *path, size_t size)
+size_t fill_pathname_slash(char *path, size_t size)
 {
    size_t path_len;
    const char *last_slash = find_last_slash(path);
-
    if (!last_slash)
-   {
-      strlcat(path, PATH_DEFAULT_SLASH(), size);
-      return;
-   }
-
-   path_len               = strlen(path);
+      return strlcat(path, PATH_DEFAULT_SLASH(), size);
+   path_len            = strlen(path);
    /* Try to preserve slash type. */
    if (last_slash != (path + path_len - 1))
    {
-      path[path_len]   = last_slash[0];
-      path[path_len+1] = '\0';
+      path[  path_len] = last_slash[0];
+      path[++path_len] = '\0';
    }
+   return path_len;
 }
 
 /**
@@ -317,12 +407,11 @@ void fill_pathname_slash(char *path, size_t size)
 size_t fill_pathname_dir(char *in_dir, const char *in_basename,
       const char *replace, size_t size)
 {
-   const char *base = NULL;
-
-   fill_pathname_slash(in_dir, size);
-   base = path_basename(in_basename);
-   strlcat(in_dir, base, size);
-   return strlcat(in_dir, replace, size);
+   size_t _len      = fill_pathname_slash(in_dir, size);
+   const char *base = path_basename(in_basename);
+   _len            += strlcpy(in_dir + _len, base,    size - _len);
+   _len            += strlcpy(in_dir + _len, replace, size - _len);
+   return _len;
 }
 
 /**
@@ -332,30 +421,15 @@ size_t fill_pathname_dir(char *in_dir, const char *in_basename,
  * @size               : size of output path
  *
  * Copies basename of @in_path into @out_path.
+ *
+ * @return Length of the string copied into @out
  **/
 size_t fill_pathname_base(char *out, const char *in_path, size_t size)
 {
    const char     *ptr = path_basename(in_path);
-
-   if (!ptr)
-      ptr = in_path;
-
-   return strlcpy(out, ptr, size);
-}
-
-void fill_pathname_base_noext(char *out,
-      const char *in_path, size_t size)
-{
-   fill_pathname_base(out, in_path, size);
-   path_remove_extension(out);
-}
-
-size_t fill_pathname_base_ext(char *out,
-      const char *in_path, const char *ext,
-      size_t size)
-{
-   fill_pathname_base_noext(out, in_path, size);
-   return strlcat(out, ext, size);
+   if (ptr)
+      return strlcpy(out, ptr, size);
+   return strlcpy(out, in_path, size);
 }
 
 /**
@@ -376,13 +450,6 @@ void fill_pathname_basedir(char *out_dir,
    path_basedir(out_dir);
 }
 
-void fill_pathname_basedir_noext(char *out_dir,
-      const char *in_path, size_t size)
-{
-   fill_pathname_basedir(out_dir, in_path, size);
-   path_remove_extension(out_dir);
-}
-
 /**
  * fill_pathname_parent_dir_name:
  * @out_dir            : output directory
@@ -391,12 +458,12 @@ void fill_pathname_basedir_noext(char *out_dir,
  *
  * Copies only the parent directory name of @in_dir into @out_dir.
  * The two buffers must not overlap. Removes trailing '/'.
- * Returns true on success, false if a slash was not found in the path.
+ *
+ * @return true on success, false if a slash was not found in the path.
  **/
 bool fill_pathname_parent_dir_name(char *out_dir,
       const char *in_dir, size_t size)
 {
-   bool success = false;
    char *temp   = strdup(in_dir);
    char *last   = find_last_slash(temp);
 
@@ -406,18 +473,30 @@ bool fill_pathname_parent_dir_name(char *out_dir,
       last      = find_last_slash(temp);
    }
 
+   /* Cut the last part of the string (the filename) after the slash,
+      leaving the directory name (or nested directory names) only. */
    if (last)
       *last     = '\0';
 
-   in_dir       = find_last_slash(temp);
+   /* Point in_dir to the address of the last slash. */
+   /* If find_last_slash returns NULL, it means there was no slash in temp,
+      so use temp as-is. */
+   if (!(in_dir = find_last_slash(temp)))
+       in_dir   = temp;
 
-   success      = in_dir && in_dir[1];
-
-   if (success)
-      strlcpy(out_dir, in_dir + 1, size);
+   if (in_dir && in_dir[1])
+   {
+       /* If path starts with an slash, eliminate it. */
+       if (path_is_absolute(in_dir))
+           strlcpy(out_dir, in_dir + 1, size);
+       else
+           strlcpy(out_dir, in_dir, size);
+       free(temp);
+       return true;
+   }
 
    free(temp);
-   return success;
+   return false;
 }
 
 /**
@@ -428,14 +507,18 @@ bool fill_pathname_parent_dir_name(char *out_dir,
  *
  * Copies parent directory of @in_dir into @out_dir.
  * Assumes @in_dir is a directory. Keeps trailing '/'.
- * If the path was already at the root directory, @out_dir will be an empty string.
+ * If the path was already at the root directory,
+ * @out_dir will be an empty string.
  **/
 void fill_pathname_parent_dir(char *out_dir,
       const char *in_dir, size_t size)
 {
+   size_t len = 0;
    if (out_dir != in_dir)
-      strlcpy(out_dir, in_dir, size);
-   path_parent_dir(out_dir);
+      len = strlcpy(out_dir, in_dir, size);
+   else
+      len = strlen(out_dir);
+   path_parent_dir(out_dir, len);
 }
 
 /**
@@ -453,14 +536,14 @@ void fill_pathname_parent_dir(char *out_dir,
 size_t fill_dated_filename(char *out_filename,
       const char *ext, size_t size)
 {
-   time_t cur_time = time(NULL);
+   size_t _len;
    struct tm tm_;
-
+   time_t cur_time = time(NULL);
    rtime_localtime(&cur_time, &tm_);
-
-   strftime(out_filename, size,
+   _len  = strftime(out_filename, size,
          "RetroArch-%m%d-%H%M%S", &tm_);
-   return strlcat(out_filename, ext, size);
+   _len += strlcpy(out_filename + _len, ext, size - _len);
+   return _len;
 }
 
 /**
@@ -475,31 +558,30 @@ size_t fill_dated_filename(char *out_filename,
  *
  * E.g.:
  * out_filename = "RetroArch-{year}{month}{day}-{Hour}{Minute}{Second}.{@ext}"
+ *
+ * @return Length of the string copied into @out_path
  **/
-void fill_str_dated_filename(char *out_filename,
+size_t fill_str_dated_filename(char *out_filename,
       const char *in_str, const char *ext, size_t size)
 {
-   char format[256];
    struct tm tm_;
+   char format[NAME_MAX_LENGTH];
+   size_t _len     = 0;
    time_t cur_time = time(NULL);
-
-   format[0]       = '\0';
-
    rtime_localtime(&cur_time, &tm_);
-
+   _len      = strlcpy(out_filename, in_str, size);
    if (string_is_empty(ext))
    {
       strftime(format, sizeof(format), "-%y%m%d-%H%M%S", &tm_);
-      fill_pathname_noext(out_filename, in_str, format, size);
+      _len  += strlcpy(out_filename + _len, format, size - _len);
    }
    else
    {
       strftime(format, sizeof(format), "-%y%m%d-%H%M%S.", &tm_);
-
-      fill_pathname_join_concat_noext(out_filename,
-            in_str, format, ext,
-            size);
+      _len  += strlcpy(out_filename + _len, format, size - _len);
+      _len  += strlcpy(out_filename + _len, ext,    size - _len);
    }
+   return _len;
 }
 
 /**
@@ -512,35 +594,33 @@ void fill_str_dated_filename(char *out_filename,
 void path_basedir(char *path)
 {
    char *last = NULL;
-
-   if (strlen(path) < 2)
+   if (!path || path[0] == '\0' || path[1] == '\0')
       return;
 
-   last = find_last_slash(path);
-
-   if (last)
+   if ((last = find_last_slash(path)))
       last[1] = '\0';
    else
-      strlcpy(path, "." PATH_DEFAULT_SLASH(), 3);
+   {
+      path[0] = '.';
+      path[1] = PATH_DEFAULT_SLASH_C();
+      path[2] = '\0';
+   }
 }
 
 /**
  * path_parent_dir:
  * @path               : path
+ * @len                : length of @path
  *
  * Extracts parent directory by mutating path.
  * Assumes that path is a directory. Keeps trailing '/'.
  * If the path was already at the root directory, returns empty string
  **/
-void path_parent_dir(char *path)
+void path_parent_dir(char *path, size_t len)
 {
-   size_t len = 0;
-
    if (!path)
       return;
    
-   len = strlen(path);
-
    if (len && PATH_CHAR_IS_SLASH(path[len - 1]))
    {
       bool path_was_absolute = path_is_absolute(path);
@@ -567,26 +647,29 @@ void path_parent_dir(char *path)
  *
  * Get basename from @path.
  *
- * Returns: basename from path.
+ * @return basename from path.
  **/
 const char *path_basename(const char *path)
 {
-   /* We cut at the first compression-related hash */
-   const char *delim = path_get_archive_delim(path);
-   if (delim)
-      return delim + 1;
-
-   {
-      /* We cut at the last slash */
-      const char *last  = find_last_slash(path);
-      if (last)
-         return last + 1;
-   }
-
+   /* We cut either at the first compression-related hash,
+    * or we cut at the last slash */
+   const char *ptr = NULL;
+   if (     (ptr = path_get_archive_delim(path))
+         || (ptr = find_last_slash(path)))
+      return ptr + 1;
    return path;
 }
 
 /* Specialized version */
+/**
+ * path_basename_nocompression:
+ * @path               : path
+ *
+ * Specialized version of path_basename().
+ * Get basename from @path.
+ *
+ * @return basename from path.
+ **/
 const char *path_basename_nocompression(const char *path)
 {
    /* We cut at the last slash */
@@ -602,30 +685,27 @@ const char *path_basename_nocompression(const char *path)
  *
  * Checks if @path is an absolute path or a relative path.
  *
- * Returns: true if path is absolute, false if path is relative.
+ * @return true if path is absolute, false if path is relative.
  **/
 bool path_is_absolute(const char *path)
 {
-   if (string_is_empty(path))
-      return false;
-
-   if (path[0] == '/')
-      return true;
-
-#if defined(_WIN32)
-   /* Many roads lead to Rome...
-    * Note: Drive letter can only be 1 character long */
-   if (string_starts_with_size(path,     "\\\\", STRLEN_CONST("\\\\")) ||
-       string_starts_with_size(path + 1, ":/",   STRLEN_CONST(":/"))   ||
-       string_starts_with_size(path + 1, ":\\",  STRLEN_CONST(":\\")))
-      return true;
-#elif defined(__wiiu__) || defined(VITA)
+   if (!string_is_empty(path))
    {
-      const char *seperator = strchr(path, ':');
-      if (seperator && (seperator[1] == '/'))
+      if (path[0] == '/')
          return true;
-   }
+#if defined(_WIN32)
+      /* Many roads lead to Rome...
+       * Note: Drive letter can only be 1 character long */
+      return ( string_starts_with_size(path,     "\\\\", STRLEN_CONST("\\\\"))
+            || string_starts_with_size(path + 1, ":/",   STRLEN_CONST(":/")) 
+            || string_starts_with_size(path + 1, ":\\",  STRLEN_CONST(":\\")));
+#elif defined(__wiiu__) || defined(VITA)
+      {
+         const char *seperator = strchr(path, ':');
+         return (seperator && (seperator[1] == '/'));
+      }
 #endif
+   }
 
    return false;
 }
@@ -640,7 +720,7 @@ bool path_is_absolute(const char *path)
  *
  * Relative paths are rebased on the current working dir.
  *
- * Returns: @buf if successful, NULL otherwise.
+ * @return @buf if successful, NULL otherwise.
  * Note: Not implemented on consoles
  * Note: Symlinks are only resolved on Unix-likes
  * Note: The current working dir might not be what you expect,
@@ -651,12 +731,13 @@ char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks)
 {
 #if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
 #ifdef _WIN32
-   char *ret = NULL;
-   wchar_t abs_path[PATH_MAX_LENGTH];
+   char *ret         = NULL;
    wchar_t *rel_path = utf8_to_utf16_string_alloc(buf);
 
    if (rel_path)
    {
+      wchar_t abs_path[PATH_MAX_LENGTH];
+
       if (_wfullpath(abs_path, rel_path, PATH_MAX_LENGTH))
       {
          char *tmp = utf16_to_utf8_string_alloc(abs_path);
@@ -697,20 +778,20 @@ char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks)
       return buf;
    }
 
-   t = 0; /* length of output */
+   t       = 0; /* length of output */
    buf_end = buf + strlen(buf);
 
    if (!path_is_absolute(buf))
    {
       size_t len;
       /* rebase on working directory */
-      if (!getcwd(tmp, PATH_MAX_LENGTH-1))
+      if (!getcwd(tmp, PATH_MAX_LENGTH - 1))
          return NULL;
 
       len = strlen(tmp);
-      t += len;
+      t  += len;
 
-      if (tmp[len-1] != '/')
+      if (tmp[len - 1] != '/')
          tmp[t++] = '/';
 
       if (string_is_empty(buf))
@@ -729,8 +810,7 @@ char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks)
     * if there are no slashes, they point relative to where one would be */
    do
    {
-      next = strchr(p, '/');
-      if (!next)
+      if (!(next = strchr(p, '/')))
          next = buf_end;
 
       if ((next - p == 2 && p[0] == '.' && p[1] == '.'))
@@ -742,8 +822,8 @@ char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks)
             return NULL;
 
          /* delete previous segment in tmp by adjusting size t
-          * tmp[t-1] == '/', find '/' before that */
-         t = t-2;
+          * tmp[t - 1] == '/', find '/' before that */
+         t -= 2;
          while (tmp[t] != '/')
             t--;
          t++;
@@ -755,15 +835,14 @@ char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks)
       else
       {
          /* fail when truncating */
-         if (t + next-p+1 > PATH_MAX_LENGTH-1)
+         if (t + next - p + 1 > PATH_MAX_LENGTH - 1)
             return NULL;
 
          while (p <= next)
             tmp[t++] = *p++;
       }
-
-   }
-   while (next < buf_end);
+   }while(next < buf_end);
+   
 
 end:
    tmp[t] = '\0';
@@ -787,6 +866,8 @@ end:
  * Both @path and @base are assumed to be absolute paths without "." or "..".
  *
  * E.g. path /a/b/e/f.cg with base /a/b/c/d/ turns into ../../e/f.cg
+ *
+ * @return Length of the string copied into @out
  **/
 size_t path_relative_to(char *out,
       const char *path, const char *base, size_t size)
@@ -796,8 +877,15 @@ size_t path_relative_to(char *out,
 
 #ifdef _WIN32
    /* For different drives, return absolute path */
-   if (strlen(path) >= 2 && strlen(base) >= 2
-         && path[1] == ':' && base[1] == ':'
+   if (
+            path
+         && base
+         && path[0] != '\0' 
+         && path[1] != '\0'
+         && base[0] != '\0'
+         && base[1] != '\0'
+         && path[1] == ':' 
+         && base[1] == ':'
          && path[0] != base[0])
       return strlcpy(out, path, size);
 #endif
@@ -840,7 +928,9 @@ void fill_pathname_resolve_relative(char *out_path,
       return;
    }
 
-   fill_pathname_basedir(out_path, in_refpath, size);
+   if (out_path != in_refpath)
+      strlcpy(out_path, in_refpath, size);
+   path_basedir(out_path);
    strlcat(out_path, in_path, size);
    path_resolve_realpath(out_path, size, false);
 }
@@ -855,17 +945,68 @@ void fill_pathname_resolve_relative(char *out_path,
  * Joins a directory (@dir) and path (@path) together.
  * Makes sure not to get  two consecutive slashes
  * between directory and path.
+ *
+ * Deprecated. Use fill_pathname_join_special() instead
+ * if you can ensure @dir and @out_path won't overlap.
+ *
+ * @return Length of the string copied into @out_path
  **/
 size_t fill_pathname_join(char *out_path,
       const char *dir, const char *path, size_t size)
 {
+   size_t _len = 0;
    if (out_path != dir)
-      strlcpy(out_path, dir, size);
+      _len = strlcpy(out_path, dir, size);
+   if (*out_path)
+      _len = fill_pathname_slash(out_path, size);
+   _len   += strlcpy(out_path + _len, path, size - _len);
+   return _len;
+}
+
+/**
+ * fill_pathname_join_special:
+ * @out_path           : output path
+ * @dir                : directory. Cannot be identical to @out_path
+ * @path               : path
+ * @size               : size of output path
+ *
+ *
+ * Specialized version of fill_pathname_join.
+ * Unlike fill_pathname_join(),
+ * @dir and @out_path CANNOT be identical.
+ *
+ * Joins a directory (@dir) and path (@path) together.
+ * Makes sure not to get  two consecutive slashes
+ * between directory and path.
+ *
+ * @return Length of the string copied into @out_path
+ **/
+size_t fill_pathname_join_special(char *out_path,
+      const char *dir, const char *path, size_t size)
+{
+   size_t len = strlcpy(out_path, dir, size);
 
    if (*out_path)
-      fill_pathname_slash(out_path, size);
+   {
+      const char *last_slash = find_last_slash(out_path);
+      if (last_slash)
+      {
+         /* Try to preserve slash type. */
+         if (last_slash != (out_path + len - 1))
+         {
+            out_path[  len] = last_slash[0];
+            out_path[++len] = '\0';
+         }
+      }
+      else
+      {
+         out_path[  len]    = PATH_DEFAULT_SLASH_C();
+         out_path[++len]    = '\0';
+      }
+   }
 
-   return strlcat(out_path, path, size);
+   len += strlcpy(out_path + len, path, size - len);
+   return len;
 }
 
 size_t fill_pathname_join_special_ext(char *out_path,
@@ -873,37 +1014,12 @@ size_t fill_pathname_join_special_ext(char *out_path,
       const char *last, const char *ext,
       size_t size)
 {
-   fill_pathname_join(out_path, dir, path, size);
+   size_t _len = fill_pathname_join(out_path, dir, path, size);
    if (*out_path)
-      fill_pathname_slash(out_path, size);
-
-   strlcat(out_path, last, size);
-   return strlcat(out_path, ext, size);
-}
-
-size_t fill_pathname_join_concat_noext(char *out_path,
-      const char *dir, const char *path,
-      const char *concat,
-      size_t size)
-{
-   fill_pathname_noext(out_path, dir, path, size);
-   return strlcat(out_path, concat, size);
-}
-
-size_t fill_pathname_join_concat(char *out_path,
-      const char *dir, const char *path,
-      const char *concat,
-      size_t size)
-{
-   fill_pathname_join(out_path, dir, path, size);
-   return strlcat(out_path, concat, size);
-}
-
-void fill_pathname_join_noext(char *out_path,
-      const char *dir, const char *path, size_t size)
-{
-   fill_pathname_join(out_path, dir, path, size);
-   path_remove_extension(out_path);
+      _len     = fill_pathname_slash(out_path, size);
+   _len       += strlcpy(out_path + _len, last, size - _len);
+   _len       += strlcpy(out_path + _len, ext,  size - _len);
+   return _len;
 }
 
 /**
@@ -920,120 +1036,50 @@ void fill_pathname_join_noext(char *out_path,
 size_t fill_pathname_join_delim(char *out_path, const char *dir,
       const char *path, const char delim, size_t size)
 {
-   size_t copied;
-   /* behavior of strlcpy is undefined if dst and src overlap */
+   size_t _len;
+   /* Behavior of strlcpy is undefined if dst and src overlap */
    if (out_path == dir)
-      copied = strlen(dir);
+      _len          = strlen(dir);
    else
-      copied = strlcpy(out_path, dir, size);
+      _len          = strlcpy(out_path, dir, size);
 
-   out_path[copied]   = delim;
-   out_path[copied+1] = '\0';
+   out_path[_len]   = delim;
+   out_path[_len+1] = '\0';
 
    if (path)
-      copied = strlcat(out_path, path, size);
-   return copied;
+      return strlcat(out_path, path, size);
+   return _len;
 }
 
-size_t fill_pathname_join_delim_concat(char *out_path, const char *dir,
-      const char *path, const char delim, const char *concat,
-      size_t size)
-{
-   fill_pathname_join_delim(out_path, dir, path, delim, size);
-   return strlcat(out_path, concat, size);
-}
-
-/**
- * fill_short_pathname_representation:
- * @out_rep            : output representation
- * @in_path            : input path
- * @size               : size of output representation
- *
- * Generates a short representation of path. It should only
- * be used for displaying the result; the output representation is not
- * binding in any meaningful way (for a normal path, this is the same as basename)
- * In case of more complex URLs, this should cut everything except for
- * the main image file.
- *
- * E.g.: "/path/to/game.img" -> game.img
- *       "/path/to/myarchive.7z#folder/to/game.img" -> game.img
- */
-size_t fill_short_pathname_representation(char* out_rep,
-      const char *in_path, size_t size)
-{
-   char path_short[PATH_MAX_LENGTH];
-
-   path_short[0] = '\0';
-
-   fill_pathname(path_short, path_basename(in_path), "",
-            sizeof(path_short));
-
-   return strlcpy(out_rep, path_short, size);
-}
-
-void fill_short_pathname_representation_noext(char* out_rep,
-      const char *in_path, size_t size)
-{
-   fill_short_pathname_representation(out_rep, in_path, size);
-   path_remove_extension(out_rep);
-}
-
-void fill_pathname_expand_special(char *out_path,
+size_t fill_pathname_expand_special(char *out_path,
       const char *in_path, size_t size)
 {
 #if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
+   char *app_dir = NULL;
    if (in_path[0] == '~')
    {
-      char *home_dir = (char*)malloc(PATH_MAX_LENGTH * sizeof(char));
-
-      home_dir[0] = '\0';
-
-      fill_pathname_home_dir(home_dir,
-         PATH_MAX_LENGTH * sizeof(char));
-
-      if (*home_dir)
-      {
-         size_t src_size = strlcpy(out_path, home_dir, size);
-         retro_assert(src_size < size);
-
-         out_path  += src_size;
-         size      -= src_size;
-
-         if (!PATH_CHAR_IS_SLASH(out_path[-1]))
-         {
-            src_size = strlcpy(out_path, PATH_DEFAULT_SLASH(), size);
-            retro_assert(src_size < size);
-
-            out_path += src_size;
-            size     -= src_size;
-         }
-
-         in_path += 2;
-      }
-
-      free(home_dir);
+      app_dir    = (char*)malloc(PATH_MAX_LENGTH * sizeof(char));
+      fill_pathname_home_dir(app_dir, PATH_MAX_LENGTH * sizeof(char));
    }
    else if (in_path[0] == ':')
    {
-      char *application_dir = (char*)malloc(PATH_MAX_LENGTH * sizeof(char));
+      app_dir    = (char*)malloc(PATH_MAX_LENGTH * sizeof(char));
+      app_dir[0] = '\0';
+      fill_pathname_application_dir(app_dir, PATH_MAX_LENGTH * sizeof(char));
+   }
 
-      application_dir[0]    = '\0';
-
-      fill_pathname_application_dir(application_dir,
-            PATH_MAX_LENGTH * sizeof(char));
-
-      if (*application_dir)
+   if (app_dir)
+   {
+      if (*app_dir)
       {
-         size_t src_size   = strlcpy(out_path, application_dir, size);
-         retro_assert(src_size < size);
+         size_t src_size = strlcpy(out_path, app_dir, size);
 
-         out_path  += src_size;
-         size      -= src_size;
+         out_path       += src_size;
+         size           -= src_size;
 
          if (!PATH_CHAR_IS_SLASH(out_path[-1]))
          {
-            src_size = strlcpy(out_path, PATH_DEFAULT_SLASH(), size);
-            retro_assert(src_size < size);
+            src_size  = strlcpy(out_path, PATH_DEFAULT_SLASH(), size);
 
             out_path += src_size;
             size     -= src_size;
@@ -1042,14 +1088,13 @@ void fill_pathname_expand_special(char *out_path,
          in_path += 2;
       }
 
-      free(application_dir);
+      free(app_dir);
    }
 #endif
-
-   retro_assert(strlcpy(out_path, in_path, size) < size);
+   return strlcpy(out_path, in_path, size);
 }
 
-void fill_pathname_abbreviate_special(char *out_path,
+size_t fill_pathname_abbreviate_special(char *out_path,
       const char *in_path, size_t size)
 {
 #if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
@@ -1060,7 +1105,6 @@ void fill_pathname_abbreviate_special(char *out_path,
    char home_dir[PATH_MAX_LENGTH];
 
    application_dir[0] = '\0';
-   home_dir[0]        = '\0';
 
    /* application_dir could be zero-string. Safeguard against this.
     *
@@ -1087,8 +1131,6 @@ void fill_pathname_abbreviate_special(char *out_path,
       {
          size_t src_size  = strlcpy(out_path, notations[i], size);
 
-         retro_assert(src_size < size);
-
          out_path        += src_size;
          size            -= src_size;
          in_path         += strlen(candidates[i]);
@@ -1103,35 +1145,58 @@ void fill_pathname_abbreviate_special(char *out_path,
          break; /* Don't allow more abbrevs to take place. */
       }
    }
-
 #endif
-
-   retro_assert(strlcpy(out_path, in_path, size) < size);
+   return strlcpy(out_path, in_path, size);
 }
 
-/* Changes the slashes to the correct kind for the os 
- * So forward slash on linux and backslash on Windows */
+/**
+ * pathname_conform_slashes_to_os:
+ *
+ * @path               : path
+ *
+ * Leaf function.
+ *
+ * Changes the slashes to the correct kind for the OS 
+ * So forward slash on linux and backslash on Windows
+ **/
 void pathname_conform_slashes_to_os(char *path)
 {
-   /* Conform slashes to os standard so we get proper matching */
-   char* p;
+   /* Conform slashes to OS standard so we get proper matching */
+   char *p;
    for (p = path; *p; p++)
       if (*p == '/' || *p == '\\')
          *p = PATH_DEFAULT_SLASH_C();
 }
 
-/* Change all shashes to forward so they are more portable between windows and linux */
+/**
+ * pathname_make_slashes_portable:
+ * @path               : path
+ *
+ * Leaf function.
+ *
+ * Change all slashes to forward so they are more 
+ * portable between Windows and Linux
+ **/
 void pathname_make_slashes_portable(char *path)
 {
-   /* Conform slashes to os standard so we get proper matching */
-   char* p;
+   /* Conform slashes to OS standard so we get proper matching */
+   char *p;
    for (p = path; *p; p++)
       if (*p == '/' || *p == '\\')
          *p = '/';
 }
 
-/* Get the number of slashes in a path, returns an integer */
-int get_pathname_num_slashes(const char *in_path)
+/**
+ * get_pathname_num_slashes:
+ * @in_path            : input path
+ *
+ * Leaf function.
+ *
+ * Get the number of slashes in a path.
+ *
+ * @return number of slashes found in @in_path.
+ **/
+static int get_pathname_num_slashes(const char *in_path)
 {
    int num_slashes = 0;
    int i = 0;
@@ -1147,11 +1212,20 @@ int get_pathname_num_slashes(const char *in_path)
    return num_slashes;
 }
 
-/* Fills the supplied path with either the abbreviated path or the relative path, which ever
- * one is has less depth / number of slashes
- * If lengths of abbreviated and relative paths are the same the relative path will be used
- * in_path can be an absolute, relative or abbreviated path */
-void fill_pathname_abbreviated_or_relative(char *out_path, const char *in_refpath, const char *in_path, size_t size)
+/**
+ * fill_pathname_abbreviated_or_relative:
+ *
+ * Fills the supplied path with either the abbreviated path or 
+ * the relative path, which ever one has less depth / number of slashes
+ * 
+ * If lengths of abbreviated and relative paths are the same,
+ * the relative path will be used
+ * @in_path can be an absolute, relative or abbreviated path
+ *
+ * @return Length of the string copied into @out_path
+ **/
+size_t fill_pathname_abbreviated_or_relative(char *out_path,
+      const char *in_refpath, const char *in_path, size_t size)
 {
    char in_path_conformed[PATH_MAX_LENGTH];
    char in_refpath_conformed[PATH_MAX_LENGTH];
@@ -1160,15 +1234,13 @@ void fill_pathname_abbreviated_or_relative(char *out_path, const char *in_refpat
    char relative_path[PATH_MAX_LENGTH];
    char abbreviated_path[PATH_MAX_LENGTH];
    
-   in_path_conformed[0]    = '\0';
-   in_refpath_conformed[0] = '\0';
    expanded_path[0]        = '\0';
    absolute_path[0]        = '\0';
    relative_path[0]        = '\0';
    abbreviated_path[0]     = '\0';
 
-   strcpy_literal(in_path_conformed, in_path);
-   strcpy_literal(in_refpath_conformed, in_refpath);
+   strlcpy(in_path_conformed, in_path, sizeof(in_path_conformed));
+   strlcpy(in_refpath_conformed, in_refpath, sizeof(in_refpath_conformed));
 
    pathname_conform_slashes_to_os(in_path_conformed);
    pathname_conform_slashes_to_os(in_refpath_conformed);
@@ -1197,9 +1269,8 @@ void fill_pathname_abbreviated_or_relative(char *out_path, const char *in_refpat
    /* Use the shortest path, preferring the relative path*/
    if (  get_pathname_num_slashes(relative_path) <= 
          get_pathname_num_slashes(abbreviated_path))
-      retro_assert(strlcpy(out_path, relative_path, size) < size);
-   else
-      retro_assert(strlcpy(out_path, abbreviated_path, size) < size);
+      return strlcpy(out_path, relative_path, size);
+   return strlcpy(out_path, abbreviated_path, size);
 }
 
 /**
@@ -1212,22 +1283,23 @@ void fill_pathname_abbreviated_or_relative(char *out_path, const char *in_refpat
 void path_basedir_wrapper(char *path)
 {
    char *last = NULL;
-   if (strlen(path) < 2)
+   if (!path || path[0] == '\0' || path[1] == '\0')
       return;
 
 #ifdef HAVE_COMPRESSION
    /* We want to find the directory with the archive in basedir. */
-   last = (char*)path_get_archive_delim(path);
-   if (last)
+   if ((last = (char*)path_get_archive_delim(path)))
       *last = '\0';
 #endif
 
-   last = find_last_slash(path);
-
-   if (last)
+   if ((last = find_last_slash(path)))
       last[1] = '\0';
    else
-      strlcpy(path, "." PATH_DEFAULT_SLASH(), 3);
+   {
+      path[0] = '.';
+      path[1] = PATH_DEFAULT_SLASH_C();
+      path[2] = '\0';
+   }
 }
 
 #if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
@@ -1282,8 +1354,9 @@ void fill_pathname_application_path(char *s, size_t len)
          char resolved_bundle_dir_buf[PATH_MAX_LENGTH] = {0};
          if (realpath(s, resolved_bundle_dir_buf))
          {
-            strlcpy(s, resolved_bundle_dir_buf, len - 1);
-            strlcat(s, "/", len);
+            size_t _len = strlcpy(s, resolved_bundle_dir_buf, len - 1);
+            s[  _len]   = '/';
+            s[++_len]   = '\0';
          }
       }
 #endif
@@ -1293,7 +1366,7 @@ void fill_pathname_application_path(char *s, size_t len)
 #ifndef HAVE_COCOATOUCH
       /* Not sure what this does but it breaks 
        * stuff for iOS, so skipping */
-      retro_assert(strlcat(s, "nobin", len) < len);
+      strlcat(s, "nobin", len);
 #endif
       return;
    }
@@ -1329,9 +1402,8 @@ void fill_pathname_application_path(char *s, size_t len)
 
          snprintf(link_path, sizeof(link_path), "/proc/%u/%s",
                (unsigned)pid, exts[i]);
-         ret = readlink(link_path, s, len - 1);
 
-         if (ret >= 0)
+         if ((ret = readlink(link_path, s, len - 1)) >= 0)
          {
             s[ret] = '\0';
             return;
@@ -1368,13 +1440,7 @@ void fill_pathname_home_dir(char *s, size_t len)
 bool is_path_accessible_using_standard_io(const char *path)
 {
 #ifdef __WINRT__
-   char relative_path_abbrev[PATH_MAX_LENGTH];
-   fill_pathname_abbreviate_special(relative_path_abbrev,
-         path, sizeof(relative_path_abbrev));
-   return (strlen(relative_path_abbrev) >= 2 )
-      &&  (    relative_path_abbrev[0] == ':'
-            || relative_path_abbrev[0] == '~')
-      && PATH_CHAR_IS_SLASH(relative_path_abbrev[1]);
+   return GetFileAttributesA(path) != INVALID_FILE_ATTRIBUTES;
 #else
    return true;
 #endif
diff --git a/libgambatte/libretro-common/file/file_path_io.c b/libgambatte/libretro-common/file/file_path_io.c
index 63587e3..d8f8187 100644
--- a/libgambatte/libretro-common/file/file_path_io.c
+++ b/libgambatte/libretro-common/file/file_path_io.c
@@ -24,13 +24,11 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <errno.h>
 
 #include <sys/stat.h>
 
 #include <boolean.h>
 #include <file/file_path.h>
-#include <retro_assert.h>
 #include <compat/strl.h>
 #include <compat/posix_string.h>
 #include <retro_miscellaneous.h>
@@ -74,7 +72,7 @@ int path_stat(const char *path)
  *
  * Checks if path is a directory.
  *
- * Returns: true (1) if path is a directory, otherwise false (0).
+ * @return true if path is a directory, otherwise false.
  */
 bool path_is_directory(const char *path)
 {
@@ -105,8 +103,10 @@ int32_t path_get_size(const char *path)
  * @dir                : directory
  *
  * Create directory on filesystem.
+ * 
+ * Recursive function.
  *
- * Returns: true (1) if directory could be created, otherwise false (0).
+ * @return true if directory could be created, otherwise false.
  **/
 bool path_mkdir(const char *dir)
 {
@@ -118,12 +118,10 @@ bool path_mkdir(const char *dir)
 
    /* Use heap. Real chance of stack 
     * overflow if we recurse too hard. */
-   basedir            = strdup(dir);
+   if (!(basedir = strdup(dir)))
+      return false;
 
-   if (!basedir)
-	   return false;
-
-   path_parent_dir(basedir);
+   path_parent_dir(basedir, strlen(basedir));
 
    if (!*basedir || !strcmp(basedir, dir))
    {
diff --git a/libgambatte/libretro-common/include/array/rhmap.h b/libgambatte/libretro-common/include/array/rhmap.h
index 0736fdd..d6aec90 100644
--- a/libgambatte/libretro-common/include/array/rhmap.h
+++ b/libgambatte/libretro-common/include/array/rhmap.h
@@ -228,18 +228,6 @@ RHMAP__UNUSED static void* rhmap__grow(void* old_ptr, size_t elem_size, size_t r
    return new_vals;
 }
 
-RHMAP__UNUSED static char* rhmap__strdup(const char * str)
-{
-   size_t full_len = strlen(str) + 1;
-   char *dup_str   = (char *)malloc(full_len);
-
-   if (!dup_str)
-      return NULL;
-
-   memcpy(dup_str, str, full_len);
-   return dup_str;
-}
-
 RHMAP__UNUSED static ptrdiff_t rhmap__idx(struct rhmap__hdr* hdr, uint32_t key, const char * str, int add, size_t del)
 {
    uint32_t i;
@@ -272,7 +260,7 @@ RHMAP__UNUSED static ptrdiff_t rhmap__idx(struct rhmap__hdr* hdr, uint32_t key,
       }
       if (!hdr->keys[i])
       {
-         if (add) { hdr->len++; hdr->keys[i] = key; if (str) hdr->key_strs[i] = rhmap__strdup(str); return (ptrdiff_t)i; }
+         if (add) { hdr->len++; hdr->keys[i] = key; if (str) hdr->key_strs[i] = strdup(str); return (ptrdiff_t)i; }
          return (ptrdiff_t)-1;
       }
    }
diff --git a/libgambatte/libretro-common/include/encodings/utf.h b/libgambatte/libretro-common/include/encodings/utf.h
index bea4e14..ccd08fa 100644
--- a/libgambatte/libretro-common/include/encodings/utf.h
+++ b/libgambatte/libretro-common/include/encodings/utf.h
@@ -38,29 +38,99 @@ enum CodePage
    CODEPAGE_UTF8  = 65001 /* CP_UTF8 */
 };
 
+/**
+ * utf8_conv_utf32:
+ *
+ * Simple implementation. Assumes the sequence is
+ * properly synchronized and terminated.
+ **/
 size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
       const char *in, size_t in_size);
 
+/**
+ * utf16_conv_utf8:
+ *
+ * Leaf function.
+ **/
 bool utf16_conv_utf8(uint8_t *out, size_t *out_chars,
       const uint16_t *in, size_t in_size);
 
+/**
+ * utf8len:
+ *
+ * Leaf function.
+ **/
 size_t utf8len(const char *string);
 
+/**
+ * utf8cpy:
+ *
+ * Acts mostly like strlcpy.
+ *
+ * Copies the given number of UTF-8 characters,
+ * but at most @d_len bytes.
+ *
+ * Always NULL terminates. Does not copy half a character.
+ * @s is assumed valid UTF-8.
+ * Use only if @chars is considerably less than @d_len. 
+ *
+ * Hidden non-leaf function cost:
+ * - Calls memcpy
+ *
+ * @return Number of bytes. 
+ **/
 size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars);
 
+/**
+ * utf8skip:
+ *
+ * Leaf function
+ **/
 const char *utf8skip(const char *str, size_t chars);
 
+/** 
+ * utf8_walk:
+ *
+ * Does not validate the input.
+ *
+ * Leaf function.
+ *
+ * @return Returns garbage if it's not UTF-8.
+ **/
 uint32_t utf8_walk(const char **string);
 
+/**
+ * utf16_to_char_string:
+ **/
 bool utf16_to_char_string(const uint16_t *in, char *s, size_t len);
 
-char* utf8_to_local_string_alloc(const char *str);
+/**
+ * utf8_to_local_string_alloc:
+ *
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
+char *utf8_to_local_string_alloc(const char *str);
 
-char* local_to_utf8_string_alloc(const char *str);
+/**
+ * local_to_utf8_string_alloc:
+ *
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
+char *local_to_utf8_string_alloc(const char *str);
 
-wchar_t* utf8_to_utf16_string_alloc(const char *str);
+/**
+ * utf8_to_utf16_string_alloc:
+ * 
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
+wchar_t *utf8_to_utf16_string_alloc(const char *str);
 
-char* utf16_to_utf8_string_alloc(const wchar_t *str);
+/**
+ * utf16_to_utf8_string_alloc:
+ *
+ * @return Returned pointer MUST be freed by the caller if non-NULL.
+ **/
+char *utf16_to_utf8_string_alloc(const wchar_t *str);
 
 RETRO_END_DECLS
 
diff --git a/libgambatte/libretro-common/include/file/file_path.h b/libgambatte/libretro-common/include/file/file_path.h
index 452763f..d410cc4 100644
--- a/libgambatte/libretro-common/include/file/file_path.h
+++ b/libgambatte/libretro-common/include/file/file_path.h
@@ -51,6 +51,28 @@ enum
    RARCH_FILE_UNSUPPORTED
 };
 
+struct path_linked_list
+{
+   char *path;
+   struct path_linked_list *next;
+};
+
+/**
+ * Create a new linked list with one item in it
+ * The path on this item will be set to NULL
+**/
+struct path_linked_list* path_linked_list_new(void);
+
+/* Free the entire linked list */
+void path_linked_list_free(struct path_linked_list *in_path_linked_list);
+
+/**
+ * Add a node to the linked list with this path
+ * If the first node's path if it's not yet set, 
+ * set this instead
+**/
+void path_linked_list_add_path(struct path_linked_list *in_path_linked_list, char *path);
+
 /**
  * path_is_compressed_file:
  * @path               : path
@@ -81,12 +103,12 @@ bool path_is_compressed_file(const char *path);
  * path_get_archive_delim:
  * @path               : path
  *
- * Gets delimiter of an archive file. Only the first '#'
+ * Find delimiter of an archive file. Only the first '#'
  * after a compression extension is considered.
  *
- * Returns: pointer to the delimiter in the path if it contains
- * a compressed file, otherwise NULL.
- */
+ * @return pointer to the delimiter in the path if it contains
+ * a path inside a compressed file, otherwise NULL.
+ **/
 const char *path_get_archive_delim(const char *path);
 
 /**
@@ -96,10 +118,28 @@ const char *path_get_archive_delim(const char *path);
  * Gets extension of file. Only '.'s
  * after the last slash are considered.
  *
- * Returns: extension part from the path.
- */
+ * Hidden non-leaf function cost:
+ * - calls string_is_empty()
+ * - calls strrchr
+ *
+ * @return extension part from the path.
+ **/
 const char *path_get_extension(const char *path);
 
+/**
+ * path_get_extension_mutable:
+ * @path               : path
+ *
+ * Specialized version of path_get_extension(). Return
+ * value is mutable.
+ *
+ * Gets extension of file. Only '.'s
+ * after the last slash are considered.
+ *
+ * @return extension part from the path.
+ **/
+char *path_get_extension_mutable(const char *path);
+
 /**
  * path_remove_extension:
  * @path               : path
@@ -108,7 +148,10 @@ const char *path_get_extension(const char *path);
  * text after and including the last '.'.
  * Only '.'s after the last slash are considered.
  *
- * Returns:
+ * Hidden non-leaf function cost:
+ * - calls strrchr
+ *
+ * @return
  * 1) If path has an extension, returns path with the
  *    extension removed.
  * 2) If there is no extension, returns NULL.
@@ -122,9 +165,26 @@ char *path_remove_extension(char *path);
  *
  * Get basename from @path.
  *
- * Returns: basename from path.
+ * Hidden non-leaf function cost:
+ * - Calls path_get_archive_delim()
+ *   - can call find_last_slash() once if it returns NULL
+ *
+ * @return basename from path.
  **/
 const char *path_basename(const char *path);
+
+/**
+ * path_basename_nocompression:
+ * @path               : path
+ *
+ * Specialized version of path_basename().
+ * Get basename from @path.
+ *
+ * Hidden non-leaf function cost:
+ * - Calls find_last_slash()
+ *
+ * @return basename from path.
+ **/
 const char *path_basename_nocompression(const char *path);
 
 /**
@@ -139,12 +199,13 @@ void path_basedir(char *path);
 /**
  * path_parent_dir:
  * @path               : path
+ * @len                : length of @path
  *
  * Extracts parent directory by mutating path.
  * Assumes that path is a directory. Keeps trailing '/'.
  * If the path was already at the root directory, returns empty string
  **/
-void path_parent_dir(char *path);
+void path_parent_dir(char *path, size_t len);
 
 /**
  * path_resolve_realpath:
@@ -156,7 +217,7 @@ void path_parent_dir(char *path);
  *
  * Relative paths are rebased on the current working dir.
  *
- * Returns: @buf if successful, NULL otherwise.
+ * @return @buf if successful, NULL otherwise.
  * Note: Not implemented on consoles
  * Note: Symlinks are only resolved on Unix-likes
  * Note: The current working dir might not be what you expect,
@@ -178,8 +239,11 @@ char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks);
  * Both @path and @base are assumed to be absolute paths without "." or "..".
  *
  * E.g. path /a/b/e/f.cgp with base /a/b/c/d/ turns into ../../e/f.cgp
+ *
+ * @return Length of the string copied into @out
  **/
-size_t path_relative_to(char *out, const char *path, const char *base, size_t size);
+size_t path_relative_to(char *out, const char *path, const char *base,
+      size_t size);
 
 /**
  * path_is_absolute:
@@ -187,7 +251,7 @@ size_t path_relative_to(char *out, const char *path, const char *base, size_t si
  *
  * Checks if @path is an absolute path or a relative path.
  *
- * Returns: true if path is absolute, false if path is relative.
+ * @return true if path is absolute, false if path is relative.
  **/
 bool path_is_absolute(const char *path);
 
@@ -211,8 +275,15 @@ bool path_is_absolute(const char *path);
  * out_path = "/foo/bar/baz/boo.asm"
  * E.g.: in_path = "/foo/bar/baz/boo.c", replace = ""     =>
  * out_path = "/foo/bar/baz/boo"
+ *
+ * Hidden non-leaf function cost:
+ * - calls strlcpy 2x
+ * - calls strrchr
+ * - calls strlcat
+ *
+ * @return Length of the string copied into @out
  */
-void fill_pathname(char *out_path, const char *in_path,
+size_t fill_pathname(char *out_path, const char *in_path,
       const char *replace, size_t size);
 
 /**
@@ -226,6 +297,12 @@ void fill_pathname(char *out_path, const char *in_path,
  *
  * E.g.:
  * out_filename = "RetroArch-{month}{day}-{Hours}{Minutes}.{@ext}"
+ *
+ * Hidden non-leaf function cost:
+ * - Calls rtime_localtime()
+ * - Calls strftime
+ * - Calls strlcat
+ *
  **/
 size_t fill_dated_filename(char *out_filename,
       const char *ext, size_t size);
@@ -242,34 +319,33 @@ size_t fill_dated_filename(char *out_filename,
  *
  * E.g.:
  * out_filename = "RetroArch-{year}{month}{day}-{Hour}{Minute}{Second}.{@ext}"
+ *
+ * Hidden non-leaf function cost:
+ * - Calls time
+ * - Calls rtime_localtime()
+ * - Calls strlcpy 2x
+ * - Calls string_is_empty()
+ * - Calls strftime
+ * - Calls strlcat
+ *
+ * @return Length of the string copied into @out_path
  **/
-void fill_str_dated_filename(char *out_filename,
+size_t fill_str_dated_filename(char *out_filename,
       const char *in_str, const char *ext, size_t size);
 
-/**
- * fill_pathname_noext:
- * @out_path           : output path
- * @in_path            : input  path
- * @replace            : what to replace
- * @size               : buffer size of output path
- *
- * Appends a filename extension 'replace' to 'in_path', and outputs
- * result in 'out_path'.
- *
- * Assumes in_path has no extension. If an extension is still
- * present in 'in_path', it will be ignored.
- *
- */
-size_t fill_pathname_noext(char *out_path, const char *in_path,
-      const char *replace, size_t size);
-
 /**
  * find_last_slash:
- * @str : input path
+ * @str                : path
+ * @size               : size of path
  *
- * Gets a pointer to the last slash in the input path.
+ * Find last slash in path. Tries to find
+ * a backslash on Windows too which takes precedence
+ * over regular slash.
+
+ * Hidden non-leaf function cost: 
+ * - calls strrchr
  *
- * Returns: a pointer to the last slash in the input path.
+ * @return pointer to last slash/backslash found in @str.
  **/
 char *find_last_slash(const char *str);
 
@@ -289,6 +365,11 @@ char *find_last_slash(const char *str);
  *
  * E.g..: in_dir = "/tmp/some_dir", in_basename = "/some_content/foo.c",
  * replace = ".asm" => in_dir = "/tmp/some_dir/foo.c.asm"
+ *
+ * Hidden non-leaf function cost:
+ * - Calls fill_pathname_slash()
+ * - Calls path_basename()
+ * - Calls strlcpy 2x
  **/
 size_t fill_pathname_dir(char *in_dir, const char *in_basename,
       const char *replace, size_t size);
@@ -300,16 +381,15 @@ size_t fill_pathname_dir(char *in_dir, const char *in_basename,
  * @size               : size of output path
  *
  * Copies basename of @in_path into @out_path.
+ *
+ * Hidden non-leaf function cost:
+ * - Calls path_basename()
+ * - Calls strlcpy
+ *
+ * @return length of the string copied into @out
  **/
 size_t fill_pathname_base(char *out_path, const char *in_path, size_t size);
 
-void fill_pathname_base_noext(char *out_dir,
-      const char *in_path, size_t size);
-
-size_t fill_pathname_base_ext(char *out,
-      const char *in_path, const char *ext,
-      size_t size);
-
 /**
  * fill_pathname_basedir:
  * @out_dir            : output directory
@@ -319,12 +399,13 @@ size_t fill_pathname_base_ext(char *out,
  * Copies base directory of @in_path into @out_path.
  * If in_path is a path without any slashes (relative current directory),
  * @out_path will get path "./".
+ *
+ * Hidden non-leaf function cost:
+ * - Calls strlcpy
+ * - Calls path_basedir()
  **/
 void fill_pathname_basedir(char *out_path, const char *in_path, size_t size);
 
-void fill_pathname_basedir_noext(char *out_dir,
-      const char *in_path, size_t size);
-
 /**
  * fill_pathname_parent_dir_name:
  * @out_dir            : output directory
@@ -333,7 +414,13 @@ void fill_pathname_basedir_noext(char *out_dir,
  *
  * Copies only the parent directory name of @in_dir into @out_dir.
  * The two buffers must not overlap. Removes trailing '/'.
- * Returns true on success, false if a slash was not found in the path.
+ *
+ * Hidden non-leaf function cost:
+ * - Calls strdup
+ * - Calls find_last_slash() x times
+ * - Can call strlcpy
+ *
+ * @return true on success, false if a slash was not found in the path.
  **/
 bool fill_pathname_parent_dir_name(char *out_dir,
       const char *in_dir, size_t size);
@@ -347,6 +434,11 @@ bool fill_pathname_parent_dir_name(char *out_dir,
  * Copies parent directory of @in_dir into @out_dir.
  * Assumes @in_dir is a directory. Keeps trailing '/'.
  * If the path was already at the root directory, @out_dir will be an empty string.
+ *
+ * Hidden non-leaf function cost:
+ * - Can call strlcpy if (@out_dir != @in_dir)
+ * - Calls strlen if (@out_dir == @in_dir)
+ * - Calls path_parent_dir()
  **/
 void fill_pathname_parent_dir(char *out_dir,
       const char *in_dir, size_t size);
@@ -374,30 +466,51 @@ void fill_pathname_resolve_relative(char *out_path, const char *in_refpath,
  * @size               : size of output path
  *
  * Joins a directory (@dir) and path (@path) together.
- * Makes sure not to get  two consecutive slashes
+ * Makes sure not to get two consecutive slashes
  * between directory and path.
+ * 
+ * Hidden non-leaf function cost: 
+ * - calls strlcpy at least once
+ * - calls fill_pathname_slash()
+ *
+ * Deprecated. Use fill_pathname_join_special() instead
+ * if you can ensure @dir != @out_path
+ *
+ * @return Length of the string copied into @out_path
  **/
 size_t fill_pathname_join(char *out_path, const char *dir,
       const char *path, size_t size);
 
+/**
+ * fill_pathname_join_special:
+ * @out_path           : output path
+ * @dir                : directory. Cannot be identical to @out_path
+ * @path               : path
+ * @size               : size of output path
+ *
+ *
+ * Specialized version of fill_pathname_join.
+ * Unlike fill_pathname_join(),
+ * @dir and @out_path CANNOT be identical.
+ *
+ * Joins a directory (@dir) and path (@path) together.
+ * Makes sure not to get two consecutive slashes
+ * between directory and path.
+ *
+ * Hidden non-leaf function cost: 
+ * - calls strlcpy 2x
+ * - calls find_last_slash()
+ *
+ * @return Length of the string copied into @out_path
+ **/
+size_t fill_pathname_join_special(char *out_path,
+      const char *dir, const char *path, size_t size);
+
 size_t fill_pathname_join_special_ext(char *out_path,
       const char *dir,  const char *path,
       const char *last, const char *ext,
       size_t size);
 
-size_t fill_pathname_join_concat_noext(char *out_path,
-      const char *dir, const char *path,
-      const char *concat,
-      size_t size);
-
-size_t fill_pathname_join_concat(char *out_path,
-      const char *dir, const char *path,
-      const char *concat,
-      size_t size);
-
-void fill_pathname_join_noext(char *out_path,
-      const char *dir, const char *path, size_t size);
-
 /**
  * fill_pathname_join_delim:
  * @out_path           : output path
@@ -408,45 +521,57 @@ void fill_pathname_join_noext(char *out_path,
  *
  * Joins a directory (@dir) and path (@path) together
  * using the given delimiter (@delim).
+ *
+ * Hidden non-leaf function cost: 
+ * - can call strlen
+ * - can call strlcpy
+ * - can call strlcat
  **/
 size_t fill_pathname_join_delim(char *out_path, const char *dir,
       const char *path, const char delim, size_t size);
 
-size_t fill_pathname_join_delim_concat(char *out_path, const char *dir,
-      const char *path, const char delim, const char *concat,
-      size_t size);
+size_t fill_pathname_expand_special(char *out_path,
+      const char *in_path, size_t size);
+
+size_t fill_pathname_abbreviate_special(char *out_path,
+      const char *in_path, size_t size);
 
 /**
- * fill_short_pathname_representation:
- * @out_rep            : output representation
- * @in_path            : input path
- * @size               : size of output representation
+ * fill_pathname_abbreviated_or_relative:
  *
- * Generates a short representation of path. It should only
- * be used for displaying the result; the output representation is not
- * binding in any meaningful way (for a normal path, this is the same as basename)
- * In case of more complex URLs, this should cut everything except for
- * the main image file.
+ * Fills the supplied path with either the abbreviated path or 
+ * the relative path, which ever one has less depth / number of slashes
+ * 
+ * If lengths of abbreviated and relative paths are the same,
+ * the relative path will be used
+ * @in_path can be an absolute, relative or abbreviated path
  *
- * E.g.: "/path/to/game.img" -> game.img
- *       "/path/to/myarchive.7z#folder/to/game.img" -> game.img
- */
-size_t fill_short_pathname_representation(char* out_rep,
-      const char *in_path, size_t size);
-
-void fill_short_pathname_representation_noext(char* out_rep,
-      const char *in_path, size_t size);
-
-void fill_pathname_expand_special(char *out_path,
-      const char *in_path, size_t size);
-
-void fill_pathname_abbreviate_special(char *out_path,
-      const char *in_path, size_t size);
-
-void fill_pathname_abbreviated_or_relative(char *out_path, const char *in_refpath, const char *in_path, size_t size);
+ * @return Length of the string copied into @out_path
+ **/
+size_t fill_pathname_abbreviated_or_relative(char *out_path,
+		const char *in_refpath, const char *in_path, size_t size);
 
+/**
+ * pathname_conform_slashes_to_os:
+ *
+ * @path               : path
+ * 
+ * Leaf function.
+ *
+ * Changes the slashes to the correct kind for the os 
+ * So forward slash on linux and backslash on Windows
+ **/
 void pathname_conform_slashes_to_os(char *path);
 
+/**
+ * pathname_make_slashes_portable:
+ * @path               : path
+ *
+ * Leaf function.
+ *
+ * Change all slashes to forward so they are more 
+ * portable between Windows and Linux
+ **/
 void pathname_make_slashes_portable(char *path);
 
 /**
@@ -464,8 +589,8 @@ void path_basedir_wrapper(char *path);
  *
  * Checks if character (@c) is a slash.
  *
- * Returns: true (1) if character is a slash, otherwise false (0).
- */
+ * @return true if character is a slash, otherwise false.
+ **/
 #ifdef _WIN32
 #define PATH_CHAR_IS_SLASH(c) (((c) == '/') || ((c) == '\\'))
 #else
@@ -477,8 +602,8 @@ void path_basedir_wrapper(char *path);
  *
  * Gets the default slash separator.
  *
- * Returns: default slash separator.
- */
+ * @return default slash separator.
+ **/
 #ifdef _WIN32
 #define PATH_DEFAULT_SLASH() "\\"
 #define PATH_DEFAULT_SLASH_C() '\\'
@@ -494,8 +619,13 @@ void path_basedir_wrapper(char *path);
  *
  * Assumes path is a directory. Appends a slash
  * if not already there.
+
+ * Hidden non-leaf function cost: 
+ * - calls find_last_slash()
+ *   - can call strlcat once if it returns false
+ * - calls strlen
  **/
-void fill_pathname_slash(char *path, size_t size);
+size_t fill_pathname_slash(char *path, size_t size);
 
 #if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
 void fill_pathname_application_path(char *buf, size_t size);
@@ -509,7 +639,16 @@ void fill_pathname_home_dir(char *buf, size_t size);
  *
  * Create directory on filesystem.
  *
- * Returns: true (1) if directory could be created, otherwise false (0).
+ * Recursive function.
+ *
+ * Hidden non-leaf function cost:
+ * - Calls strdup
+ * - Calls path_parent_dir()
+ * - Calls strcmp
+ * - Calls path_is_directory()
+ * - Calls path_mkdir()
+ *
+ * @return true if directory could be created, otherwise false.
  **/
 bool path_mkdir(const char *dir);
 
@@ -519,10 +658,15 @@ bool path_mkdir(const char *dir);
  *
  * Checks if path is a directory.
  *
- * Returns: true (1) if path is a directory, otherwise false (0).
+ * @return true if path is a directory, otherwise false.
  */
 bool path_is_directory(const char *path);
 
+/* Time format strings with AM-PM designation require special
+ * handling due to platform dependence */
+void strftime_am_pm(char *s, size_t len, const char* format,
+      const void* timeptr);
+
 bool path_is_character_special(const char *path);
 
 int path_stat(const char *path);
diff --git a/libgambatte/libretro-common/include/libretro.h b/libgambatte/libretro-common/include/libretro.h
index 4bd3f2f..cb1c2d2 100644
--- a/libgambatte/libretro-common/include/libretro.h
+++ b/libgambatte/libretro-common/include/libretro.h
@@ -291,6 +291,7 @@ enum retro_language
    RETRO_LANGUAGE_CATALAN             = 29,
    RETRO_LANGUAGE_BRITISH_ENGLISH     = 30,
    RETRO_LANGUAGE_HUNGARIAN           = 31,
+   RETRO_LANGUAGE_BELARUSIAN          = 32,
    RETRO_LANGUAGE_LAST,
 
    /* Ensure sizeof(enum) == sizeof(int) */
@@ -928,8 +929,6 @@ enum retro_mod
                                             * anything else.
                                             * It is recommended to expose all relevant pointers through
                                             * retro_get_memory_* as well.
-                                            *
-                                            * Can be called from retro_init and retro_load_game.
                                             */
 #define RETRO_ENVIRONMENT_SET_GEOMETRY 37
                                            /* const struct retro_game_geometry * --
@@ -1767,6 +1766,90 @@ enum retro_mod
                                             * (see enum retro_savestate_context)
                                             */
 
+#define RETRO_ENVIRONMENT_GET_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_SUPPORT (73 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                            /* struct retro_hw_render_context_negotiation_interface * --
+                                             * Before calling SET_HW_RNEDER_CONTEXT_NEGOTIATION_INTERFACE, a core can query
+                                             * which version of the interface is supported.
+                                             *
+                                             * Frontend looks at interface_type and returns the maximum supported
+                                             * context negotiation interface version.
+                                             * If the interface_type is not supported or recognized by the frontend, a version of 0
+                                             * must be returned in interface_version and true is returned by frontend.
+                                             *
+                                             * If this environment call returns true with interface_version greater than 0,
+                                             * a core can always use a negotiation interface version larger than what the frontend returns, but only
+                                             * earlier versions of the interface will be used by the frontend.
+                                             * A frontend must not reject a negotiation interface version that is larger than
+                                             * what the frontend supports. Instead, the frontend will use the older entry points that it recognizes.
+                                             * If this is incompatible with a particular core's requirements, it can error out early.
+                                             *
+                                             * Backwards compatibility note:
+                                             * This environment call was introduced after Vulkan v1 context negotiation.
+                                             * If this environment call is not supported by frontend - i.e. the environment call returns false -
+                                             * only Vulkan v1 context negotiation is supported (if Vulkan HW rendering is supported at all).
+                                             * If a core uses Vulkan negotiation interface with version > 1, negotiation may fail unexpectedly.
+                                             * All future updates to the context negotiation interface implies that frontend must support
+                                             * this environment call to query support.
+                                             */
+
+#define RETRO_ENVIRONMENT_GET_JIT_CAPABLE 74
+                                           /* bool * --
+                                            * Result is set to true if the frontend has already verified JIT can be
+                                            * used, mainly for use iOS/tvOS. On other platforms the result is true.
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_MICROPHONE_INTERFACE (75 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_microphone_interface * --
+                                            * Returns an interface that can be used to receive input from the microphone driver.
+                                            *
+                                            * Returns true if microphone support is available,
+                                            * even if no microphones are plugged in.
+                                            * Returns false if mic support is disabled or unavailable.
+                                            *
+                                            * This callback can be invoked at any time,
+                                            * even before the microphone driver is ready.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_NETPACKET_INTERFACE 76
+                                           /* const struct retro_netpacket_callback * --
+                                            * When set, a core gains control over network packets sent and
+                                            * received during a multiplayer session. This can be used to
+                                            * emulate multiplayer games that were originally played on two
+                                            * or more separate consoles or computers connected together.
+                                            *
+                                            * The frontend will take care of connecting players together,
+                                            * and the core only needs to send the actual data as needed for
+                                            * the emulation, while handshake and connection management happen
+                                            * in the background.
+                                            *
+                                            * When two or more players are connected and this interface has
+                                            * been set, time manipulation features (such as pausing, slow motion,
+                                            * fast forward, rewinding, save state loading, etc.) are disabled to
+                                            * avoid interrupting communication.
+                                            *
+                                            * Should be set in either retro_init or retro_load_game, but not both.
+                                            *
+                                            * When not set, a frontend may use state serialization-based
+                                            * multiplayer, where a deterministic core supporting multiple
+                                            * input devices does not need to take any action on its own.
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_DEVICE_POWER (77 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_device_power * --
+                                            * Returns the device's current power state as reported by the frontend.
+                                            * This is useful for emulating the battery level in handheld consoles,
+                                            * or for reducing power consumption when on battery power.
+                                            *
+                                            * The return value indicates whether the frontend can provide this information,
+                                            * even if the parameter is NULL.
+                                            *
+                                            * If the frontend does not support this functionality,
+                                            * then the provided argument will remain unchanged.
+                                            *
+                                            * Note that this environment call describes the power state for the entire device,
+                                            * not for individual peripherals like controllers.
+                                            */
+
 /* VFS functionality */
 
 /* File paths:
@@ -1941,13 +2024,13 @@ struct retro_vfs_interface_info
 
 enum retro_hw_render_interface_type
 {
-	RETRO_HW_RENDER_INTERFACE_VULKAN = 0,
-	RETRO_HW_RENDER_INTERFACE_D3D9   = 1,
-	RETRO_HW_RENDER_INTERFACE_D3D10  = 2,
-	RETRO_HW_RENDER_INTERFACE_D3D11  = 3,
-	RETRO_HW_RENDER_INTERFACE_D3D12  = 4,
+   RETRO_HW_RENDER_INTERFACE_VULKAN     = 0,
+   RETRO_HW_RENDER_INTERFACE_D3D9       = 1,
+   RETRO_HW_RENDER_INTERFACE_D3D10      = 2,
+   RETRO_HW_RENDER_INTERFACE_D3D11      = 3,
+   RETRO_HW_RENDER_INTERFACE_D3D12      = 4,
    RETRO_HW_RENDER_INTERFACE_GSKIT_PS2  = 5,
-   RETRO_HW_RENDER_INTERFACE_DUMMY  = INT_MAX
+   RETRO_HW_RENDER_INTERFACE_DUMMY      = INT_MAX
 };
 
 /* Base struct. All retro_hw_render_interface_* types
@@ -2723,9 +2806,17 @@ enum retro_hw_context_type
    /* Vulkan, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE. */
    RETRO_HW_CONTEXT_VULKAN           = 6,
 
-   /* Direct3D, set version_major to select the type of interface
-    * returned by RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */
-   RETRO_HW_CONTEXT_DIRECT3D         = 7,
+   /* Direct3D11, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */
+   RETRO_HW_CONTEXT_D3D11            = 7,
+
+   /* Direct3D10, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */
+   RETRO_HW_CONTEXT_D3D10            = 8,
+
+   /* Direct3D12, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */
+   RETRO_HW_CONTEXT_D3D12            = 9,
+
+   /* Direct3D9, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */
+   RETRO_HW_CONTEXT_D3D9             = 10,
 
    RETRO_HW_CONTEXT_DUMMY = INT_MAX
 };
@@ -2980,6 +3071,100 @@ struct retro_disk_control_ext_callback
    retro_get_image_label_t get_image_label;     /* Optional - may be NULL */
 };
 
+/* Definitions for RETRO_ENVIRONMENT_SET_NETPACKET_INTERFACE.
+ * A core can set it if sending and receiving custom network packets
+ * during a multiplayer session is desired.
+ */
+
+/* Netpacket flags for retro_netpacket_send_t */
+#define RETRO_NETPACKET_UNRELIABLE  0        /* Packet to be sent unreliable, depending on network quality it might not arrive. */
+#define RETRO_NETPACKET_RELIABLE    (1 << 0) /* Reliable packets are guaranteed to arrive at the target in the order they were send. */
+#define RETRO_NETPACKET_UNSEQUENCED (1 << 1) /* Packet will not be sequenced with other packets and may arrive out of order. Cannot be set on reliable packets. */
+
+/* Used by the core to send a packet to one or more connected players.
+ * A single packet sent via this interface can contain up to 64 KB of data.
+ *
+ * The broadcast flag can be set to true to send to multiple connected clients.
+ * In a broadcast, the client_id argument indicates 1 client NOT to send the
+ * packet to (pass 0xFFFF to send to everyone). Otherwise, the client_id
+ * argument indicates a single client to send the packet to.
+ *
+ * A frontend must support sending reliable packets (RETRO_NETPACKET_RELIABLE).
+ * Unreliable packets might not be supported by the frontend, but the flags can
+ * still be specified. Reliable transmission will be used instead.
+ *
+ * If this function is called passing NULL for buf, it will instead flush all
+ * previously buffered outgoing packets and instantly read any incoming packets.
+ * During such a call, retro_netpacket_receive_t and retro_netpacket_stop_t can
+ * be called. The core can perform this in a loop to do a blocking read, i.e.,
+ * wait for incoming data, but needs to handle stop getting called and also
+ * give up after a short while to avoid freezing on a connection problem.
+ *
+ * This function is not guaranteed to be thread-safe and must be called during
+ * retro_run or any of the netpacket callbacks passed with this interface.
+ */
+typedef void (RETRO_CALLCONV *retro_netpacket_send_t)(int flags, const void* buf, size_t len, uint16_t client_id, bool broadcast);
+
+/* Called by the frontend to signify that a multiplayer session has started.
+ * If client_id is 0 the local player is the host of the session and at this
+ * point no other player has connected yet.
+ *
+ * If client_id is > 0 the local player is a client connected to a host and
+ * at this point is already fully connected to the host.
+ *
+ * The core must store the retro_netpacket_send_t function pointer provided
+ * here and use it whenever it wants to send a packet. This function pointer
+ * remains valid until the frontend calls retro_netpacket_stop_t.
+ */
+typedef void (RETRO_CALLCONV *retro_netpacket_start_t)(uint16_t client_id, retro_netpacket_send_t send_fn);
+
+/* Called by the frontend when a new packet arrives which has been sent from
+ * another player with retro_netpacket_send_t. The client_id argument indicates
+ * who has sent the packet.
+ */
+typedef void (RETRO_CALLCONV *retro_netpacket_receive_t)(const void* buf, size_t len, uint16_t client_id);
+
+/* Called by the frontend when the multiplayer session has ended.
+ * Once this gets called the retro_netpacket_send_t function pointer passed
+ * to retro_netpacket_start_t will not be valid anymore.
+ */
+typedef void (RETRO_CALLCONV *retro_netpacket_stop_t)(void);
+
+/* Called by the frontend every frame (between calls to retro_run while
+ * updating the state of the multiplayer session.
+ * This is a good place for the core to call retro_netpacket_send_t from.
+ */
+typedef void (RETRO_CALLCONV *retro_netpacket_poll_t)(void);
+
+/* Called by the frontend when a new player connects to the hosted session.
+ * This is only called on the host side, not for clients connected to the host.
+ * If this function returns false, the newly connected player gets dropped.
+ * This can be used for example to limit the number of players.
+ */
+typedef bool (RETRO_CALLCONV *retro_netpacket_connected_t)(uint16_t client_id);
+
+/* Called by the frontend when a player leaves or disconnects from the hosted session.
+ * This is only called on the host side, not for clients connected to the host.
+ */
+typedef void (RETRO_CALLCONV *retro_netpacket_disconnected_t)(uint16_t client_id);
+
+/**
+ * A callback interface for giving a core the ability to send and receive custom
+ * network packets during a multiplayer session between two or more instances
+ * of a libretro frontend.
+ *
+ * @see RETRO_ENVIRONMENT_SET_NETPACKET_INTERFACE
+ */
+struct retro_netpacket_callback
+{
+   retro_netpacket_start_t        start;
+   retro_netpacket_receive_t      receive;
+   retro_netpacket_stop_t         stop;         /* Optional - may be NULL */
+   retro_netpacket_poll_t         poll;         /* Optional - may be NULL */
+   retro_netpacket_connected_t    connected;    /* Optional - may be NULL */
+   retro_netpacket_disconnected_t disconnected; /* Optional - may be NULL */
+};
+
 enum retro_pixel_format
 {
    /* 0RGB1555, native endian.
@@ -3782,6 +3967,289 @@ struct retro_throttle_state
    float rate;
 };
 
+/**
+ * Opaque handle to a microphone that's been opened for use.
+ * The underlying object is accessed or created with \c retro_microphone_interface_t.
+ */
+typedef struct retro_microphone retro_microphone_t;
+
+/**
+ * Parameters for configuring a microphone.
+ * Some of these might not be honored,
+ * depending on the available hardware and driver configuration.
+ */
+typedef struct retro_microphone_params
+{
+   /**
+    * The desired sample rate of the microphone's input, in Hz.
+    * The microphone's input will be resampled,
+    * so cores can ask for whichever frequency they need.
+    *
+    * If zero, some reasonable default will be provided by the frontend
+    * (usually from its config file).
+    *
+    * @see retro_get_mic_rate_t
+    */
+   unsigned rate;
+} retro_microphone_params_t;
+
+/**
+ * @copydoc retro_microphone_interface::open_mic
+ */
+typedef retro_microphone_t *(RETRO_CALLCONV *retro_open_mic_t)(const retro_microphone_params_t *params);
+
+/**
+ * @copydoc retro_microphone_interface::close_mic
+ */
+typedef void (RETRO_CALLCONV *retro_close_mic_t)(retro_microphone_t *microphone);
+
+/**
+ * @copydoc retro_microphone_interface::get_params
+ */
+typedef bool (RETRO_CALLCONV *retro_get_mic_params_t)(const retro_microphone_t *microphone, retro_microphone_params_t *params);
+
+/**
+ * @copydoc retro_microphone_interface::set_mic_state
+ */
+typedef bool (RETRO_CALLCONV *retro_set_mic_state_t)(retro_microphone_t *microphone, bool state);
+
+/**
+ * @copydoc retro_microphone_interface::get_mic_state
+ */
+typedef bool (RETRO_CALLCONV *retro_get_mic_state_t)(const retro_microphone_t *microphone);
+
+/**
+ * @copydoc retro_microphone_interface::read_mic
+ */
+typedef int (RETRO_CALLCONV *retro_read_mic_t)(retro_microphone_t *microphone, int16_t* samples, size_t num_samples);
+
+/**
+ * The current version of the microphone interface.
+ * Will be incremented whenever \c retro_microphone_interface or \c retro_microphone_params_t
+ * receive new fields.
+ *
+ * Frontends using cores built against older mic interface versions
+ * should not access fields introduced in newer versions.
+ */
+#define RETRO_MICROPHONE_INTERFACE_VERSION 1
+
+/**
+ * An interface for querying the microphone and accessing data read from it.
+ *
+ * @see RETRO_ENVIRONMENT_GET_MICROPHONE_INTERFACE
+ */
+struct retro_microphone_interface
+{
+   /**
+    * The version of this microphone interface.
+    * Set by the core to request a particular version,
+    * and set by the frontend to indicate the returned version.
+    * 0 indicates that the interface is invalid or uninitialized.
+    */
+   unsigned interface_version;
+
+   /**
+    * Initializes a new microphone.
+    * Assuming that microphone support is enabled and provided by the frontend,
+    * cores may call this function whenever necessary.
+    * A microphone could be opened throughout a core's lifetime,
+    * or it could wait until a microphone is plugged in to the emulated device.
+    *
+    * The returned handle will be valid until it's freed,
+    * even if the audio driver is reinitialized.
+    *
+    * This function is not guaranteed to be thread-safe.
+    *
+    * @param args[in] Parameters used to create the microphone.
+    * May be \c NULL, in which case the default value of each parameter will be used.
+    *
+    * @returns Pointer to the newly-opened microphone,
+    * or \c NULL if one couldn't be opened.
+    * This likely means that no microphone is plugged in and recognized,
+    * or the maximum number of supported microphones has been reached.
+    *
+    * @note Microphones are \em inactive by default;
+    * to begin capturing audio, call \c set_mic_state.
+    * @see retro_microphone_params_t
+    */
+   retro_open_mic_t open_mic;
+
+   /**
+    * Closes a microphone that was initialized with \c open_mic.
+    * Calling this function will stop all microphone activity
+    * and free up the resources that it allocated.
+    * Afterwards, the handle is invalid and must not be used.
+    *
+    * A frontend may close opened microphones when unloading content,
+    * but this behavior is not guaranteed.
+    * Cores should close their microphones when exiting, just to be safe.
+    *
+    * @param microphone Pointer to the microphone that was allocated by \c open_mic.
+    * If \c NULL, this function does nothing.
+    *
+    * @note The handle might be reused if another microphone is opened later.
+    */
+   retro_close_mic_t close_mic;
+
+   /**
+    * Returns the configured parameters of this microphone.
+    * These may differ from what was requested depending on
+    * the driver and device configuration.
+    *
+    * Cores should check these values before they start fetching samples.
+    *
+    * Will not change after the mic was opened.
+    *
+    * @param microphone[in] Opaque handle to the microphone
+    * whose parameters will be retrieved.
+    * @param params[out] The parameters object that the
+    * microphone's parameters will be copied to.
+    *
+    * @return \c true if the parameters were retrieved,
+    * \c false if there was an error.
+    */
+   retro_get_mic_params_t get_params;
+
+   /**
+    * Enables or disables the given microphone.
+    * Microphones are disabled by default
+    * and must be explicitly enabled before they can be used.
+    * Disabled microphones will not process incoming audio samples,
+    * and will therefore have minimal impact on overall performance.
+    * Cores may enable microphones throughout their lifetime,
+    * or only for periods where they're needed.
+    *
+    * Cores that accept microphone input should be able to operate without it;
+    * we suggest substituting silence in this case.
+    *
+    * @param microphone Opaque handle to the microphone
+    * whose state will be adjusted.
+    * This will have been provided by \c open_mic.
+    * @param state \c true if the microphone should receive audio input,
+    * \c false if it should be idle.
+    * @returns \c true if the microphone's state was successfully set,
+    * \c false if \c microphone is invalid
+    * or if there was an error.
+    */
+   retro_set_mic_state_t set_mic_state;
+
+   /**
+    * Queries the active state of a microphone at the given index.
+    * Will return whether the microphone is enabled,
+    * even if the driver is paused.
+    *
+    * @param microphone Opaque handle to the microphone
+    * whose state will be queried.
+    * @return \c true if the provided \c microphone is valid and active,
+    * \c false if not or if there was an error.
+    */
+   retro_get_mic_state_t get_mic_state;
+
+   /**
+    * Retrieves the input processed by the microphone since the last call.
+    * \em Must be called every frame unless \c microphone is disabled,
+    * similar to how \c retro_audio_sample_batch_t works.
+    *
+    * @param[in] microphone Opaque handle to the microphone
+    * whose recent input will be retrieved.
+    * @param[out] samples The buffer that will be used to store the microphone's data.
+    * Microphone input is in mono (i.e. one number per sample).
+    * Should be large enough to accommodate the expected number of samples per frame;
+    * for example, a 44.1kHz sample rate at 60 FPS would require space for 735 samples.
+    * @param[in] num_samples The size of the data buffer in samples (\em not bytes).
+    * Microphone input is in mono, so a "frame" and a "sample" are equivalent in length here.
+    *
+    * @return The number of samples that were copied into \c samples.
+    * If \c microphone is pending driver initialization,
+    * this function will copy silence of the requested length into \c samples.
+    *
+    * Will return -1 if the microphone is disabled,
+    * the audio driver is paused,
+    * or there was an error.
+    */
+   retro_read_mic_t read_mic;
+};
+
+/**
+ * Describes how a device is being powered.
+ * @see RETRO_ENVIRONMENT_GET_DEVICE_POWER
+ */
+enum retro_power_state
+{
+   /**
+    * Indicates that the frontend cannot report its power state at this time,
+    * most likely due to a lack of support.
+    *
+    * \c RETRO_ENVIRONMENT_GET_DEVICE_POWER will not return this value;
+    * instead, the environment callback will return \c false.
+    */
+   RETRO_POWERSTATE_UNKNOWN = 0,
+
+   /**
+    * Indicates that the device is running on its battery.
+    * Usually applies to portable devices such as handhelds, laptops, and smartphones.
+    */
+   RETRO_POWERSTATE_DISCHARGING,
+
+   /**
+    * Indicates that the device's battery is currently charging.
+    */
+   RETRO_POWERSTATE_CHARGING,
+
+   /**
+    * Indicates that the device is connected to a power source
+    * and that its battery has finished charging.
+    */
+   RETRO_POWERSTATE_CHARGED,
+
+   /**
+    * Indicates that the device is connected to a power source
+    * and that it does not have a battery.
+    * This usually suggests a desktop computer or a non-portable game console.
+    */
+   RETRO_POWERSTATE_PLUGGED_IN
+};
+
+/**
+ * Indicates that an estimate is not available for the battery level or time remaining,
+ * even if the actual power state is known.
+ */
+#define RETRO_POWERSTATE_NO_ESTIMATE (-1)
+
+/**
+ * Describes the power state of the device running the frontend.
+ * @see RETRO_ENVIRONMENT_GET_DEVICE_POWER
+ */
+struct retro_device_power
+{
+   /**
+    * The current state of the frontend's power usage.
+    */
+   enum retro_power_state state;
+
+   /**
+    * A rough estimate of the amount of time remaining (in seconds)
+    * before the device powers off.
+    * This value depends on a variety of factors,
+    * so it is not guaranteed to be accurate.
+    *
+    * Will be set to \c RETRO_POWERSTATE_NO_ESTIMATE if \c state does not equal \c RETRO_POWERSTATE_DISCHARGING.
+    * May still be set to \c RETRO_POWERSTATE_NO_ESTIMATE if the frontend is unable to provide an estimate.
+    */
+   int seconds;
+
+   /**
+    * The approximate percentage of battery charge,
+    * ranging from 0 to 100 (inclusive).
+    * The device may power off before this reaches 0.
+    *
+    * The user might have configured their device
+    * to stop charging before the battery is full,
+    * so do not assume that this will be 100 in the \c RETRO_POWERSTATE_CHARGED state.
+    */
+   int8_t percent;
+};
+
 /* Callbacks */
 
 /* Environment callback. Gives implementations a way of performing
diff --git a/libgambatte/libretro-common/include/retro_common_api.h b/libgambatte/libretro-common/include/retro_common_api.h
index 0f68b7d..ebb645d 100644
--- a/libgambatte/libretro-common/include/retro_common_api.h
+++ b/libgambatte/libretro-common/include/retro_common_api.h
@@ -101,6 +101,26 @@ typedef int ssize_t;
 #define STRING_REP_UINT64 "%" PRIu64
 #define STRING_REP_USIZE "%" PRIuPTR
 
+/* Wrap a declaration in RETRO_DEPRECATED() to produce a compiler warning when
+it's used. This is intended for developer machines, so it won't work on ancient
+or obscure compilers */
+#if defined(_MSC_VER)
+#if _MSC_VER >= 1400 /* Visual C 2005 or later */
+#define RETRO_DEPRECATED(decl) __declspec(deprecated) decl
+#endif
+#elif defined(__GNUC__)
+#if __GNUC__ >= 3 /* GCC 3 or later */
+#define RETRO_DEPRECATED(decl) decl __attribute__((deprecated))
+#endif
+#elif defined(__clang__)
+#if __clang_major__ >= 3 /* clang 3 or later */
+#define RETRO_DEPRECATED(decl) decl __attribute__((deprecated))
+#endif
+#endif
+#ifndef RETRO_DEPRECATED /* Unsupported compilers */
+#define RETRO_DEPRECATED(decl) decl
+#endif
+
 /*
 I would like to see retro_inline.h moved in here; possibly boolean too.
 
diff --git a/libgambatte/libretro-common/include/retro_miscellaneous.h b/libgambatte/libretro-common/include/retro_miscellaneous.h
index f0dfb5c..953ab18 100644
--- a/libgambatte/libretro-common/include/retro_miscellaneous.h
+++ b/libgambatte/libretro-common/include/retro_miscellaneous.h
@@ -49,6 +49,10 @@
 #include <compat/msvc.h>
 #endif
 
+#ifdef IOS
+#include <sys/param.h>
+#endif
+
 static INLINE void bits_or_bits(uint32_t *a, uint32_t *b, uint32_t count)
 {
    uint32_t i;
@@ -74,14 +78,29 @@ static INLINE bool bits_any_set(uint32_t* ptr, uint32_t count)
    return false;
 }
 
+static INLINE bool bits_any_different(uint32_t *a, uint32_t *b, uint32_t count)
+{
+   uint32_t i;
+   for (i = 0; i < count; i++)
+   {
+      if (a[i] != b[i])
+         return true;
+   }
+   return false;
+}
+
 #ifndef PATH_MAX_LENGTH
-#if defined(_XBOX1) || defined(_3DS) || defined(PSP) || defined(PS2) || defined(GEKKO)|| defined(WIIU) || defined(ORBIS) || defined(__PSL1GHT__) || defined(__PS3__)
+#if defined(_XBOX1) || defined(_3DS) || defined(PSP) || defined(PS2) || defined(GEKKO)|| defined(WIIU) || defined(__PSL1GHT__) || defined(__PS3__)
 #define PATH_MAX_LENGTH 512
 #else
 #define PATH_MAX_LENGTH 4096
 #endif
 #endif
 
+#ifndef NAME_MAX_LENGTH
+#define NAME_MAX_LENGTH 256
+#endif
+
 #ifndef MAX
 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 #endif
diff --git a/libgambatte/libretro-common/include/streams/file_stream.h b/libgambatte/libretro-common/include/streams/file_stream.h
index 5276f87..079221e 100644
--- a/libgambatte/libretro-common/include/streams/file_stream.h
+++ b/libgambatte/libretro-common/include/streams/file_stream.h
@@ -59,7 +59,7 @@ int64_t filestream_truncate(RFILE *stream, int64_t length);
  * @bufsize            : optional buffer size (-1 or 0 to use default)
  *
  * Opens a file for reading or writing, depending on the requested mode.
- * Returns a pointer to an RFILE if opened successfully, otherwise NULL.
+ * @return A pointer to an RFILE if opened successfully, otherwise NULL.
  **/
 RFILE* filestream_open(const char *path, unsigned mode, unsigned hints);
 
@@ -75,6 +75,17 @@ void filestream_rewind(RFILE *stream);
 
 int filestream_close(RFILE *stream);
 
+/**
+ * filestream_read_file:
+ * @path             : path to file.
+ * @buf              : buffer to allocate and read the contents of the
+ *                     file into. Needs to be freed manually.
+ * @len              : optional output integer containing bytes read.
+ *
+ * Read the contents of a file into @buf.
+ *
+ * @return Non-zero on success.
+ */
 int64_t filestream_read_file(const char *path, void **buf, int64_t *len);
 
 char* filestream_gets(RFILE *stream, char *s, size_t len);
@@ -87,6 +98,16 @@ int filestream_scanf(RFILE *stream, const char* format, ...);
 
 int filestream_eof(RFILE *stream);
 
+/**
+ * filestream_write_file:
+ * @path             : path to file.
+ * @data             : contents to write to the file.
+ * @size             : size of the contents.
+ *
+ * Writes data to a file.
+ *
+ * @return true on success, otherwise false.
+ **/
 bool filestream_write_file(const char *path, const void *data, int64_t size);
 
 int filestream_putc(RFILE *stream, int c);
@@ -107,7 +128,11 @@ const char* filestream_get_path(RFILE *stream);
 
 bool filestream_exists(const char *path);
 
-/* Returned pointer must be freed by the caller. */
+/**
+ * filestream_getline:
+ *
+ * Returned pointer must be freed by the caller.
+ **/
 char* filestream_getline(RFILE *stream);
 
 libretro_vfs_implementation_file* filestream_get_vfs_handle(RFILE *stream);
diff --git a/libgambatte/libretro-common/include/string/stdstring.h b/libgambatte/libretro-common/include/string/stdstring.h
index e7087d6..4e38e8d 100644
--- a/libgambatte/libretro-common/include/string/stdstring.h
+++ b/libgambatte/libretro-common/include/string/stdstring.h
@@ -48,7 +48,7 @@ RETRO_BEGIN_DECLS
 #define TOUPPER(c)   ((c) & ~(lr_char_props[(unsigned char)(c)] & 0x20))
 
 /* C standard says \f \v are space, but this one disagrees */
-#define ISSPACE(c)   (lr_char_props[(unsigned char)(c)] & 0x80) 
+#define ISSPACE(c)   (lr_char_props[(unsigned char)(c)] & 0x80)
 
 #define ISDIGIT(c)   (lr_char_props[(unsigned char)(c)] & 0x40)
 #define ISALPHA(c)   (lr_char_props[(unsigned char)(c)] & 0x20)
@@ -92,16 +92,20 @@ static INLINE bool string_ends_with_size(const char *str, const char *suffix,
 
 static INLINE bool string_ends_with(const char *str, const char *suffix)
 {
-   if (!str || !suffix)
-      return false;
-   return string_ends_with_size(str, suffix, strlen(str), strlen(suffix));
+   return str && suffix && string_ends_with_size(str, suffix, strlen(str), strlen(suffix));
 }
 
-/* Returns the length of 'str' (c.f. strlen()), but only
+/**
+ * strlen_size:
+ *
+ * Leaf function.
+ *
+ * @return the length of 'str' (c.f. strlen()), but only
  * checks the first 'size' characters
  * - If 'str' is NULL, returns 0
  * - If 'str' is not NULL and no '\0' character is found
- *   in the first 'size' characters, returns 'size' */
+ *   in the first 'size' characters, returns 'size'
+ **/
 static INLINE size_t strlen_size(const char *str, size_t size)
 {
    size_t i = 0;
@@ -130,25 +134,68 @@ static INLINE bool string_is_equal_case_insensitive(const char *a,
    return (result == 0);
 }
 
+static INLINE bool string_starts_with_case_insensitive(const char *str,
+      const char *prefix)
+{
+   int result              = 0;
+   const unsigned char *p1 = (const unsigned char*)str;
+   const unsigned char *p2 = (const unsigned char*)prefix;
+
+   if (!str || !prefix)
+      return false;
+   if (p1 == p2)
+      return true;
+
+   while ((result = tolower (*p1++) - tolower (*p2)) == 0)
+      if (*p2++ == '\0')
+         break;
+
+   return (result == 0 || *p2 == '\0');
+}
+
 char *string_to_upper(char *s);
 
 char *string_to_lower(char *s);
 
 char *string_ucwords(char *s);
 
-char *string_replace_substring(const char *in, const char *pattern,
-      const char *by);
+char *string_replace_substring(const char *in,
+      const char *pattern, size_t pattern_len,
+      const char *replacement, size_t replacement_len);
 
-/* Remove leading whitespaces */
+/**
+ * string_trim_whitespace_left:
+ *
+ * Remove leading whitespaces
+ **/
 char *string_trim_whitespace_left(char *const s);
 
-/* Remove trailing whitespaces */
+/**
+ * string_trim_whitespace_right:
+ *
+ * Remove trailing whitespaces
+ **/
 char *string_trim_whitespace_right(char *const s);
 
-/* Remove leading and trailing whitespaces */
+/**
+ * string_trim_whitespace:
+ *
+ * Remove leading and trailing whitespaces
+ **/
 char *string_trim_whitespace(char *const s);
 
-/*
+/**
+ * word_wrap:
+ * @dst                : pointer to destination buffer.
+ * @dst_size           : size of destination buffer.
+ * @src                : pointer to input string.
+ * @src_len            : length of @src
+ * @line_width         : max number of characters per line.
+ * @wideglyph_width    : not used, but is necessary to keep
+ *                       compatibility with word_wrap_wideglyph().
+ * @max_lines          : max lines of destination string.
+ *                       0 means no limit.
+ *
  * Wraps string specified by 'src' to destination buffer
  * specified by 'dst' and 'dst_size'.
  * This function assumes that all glyphs in the string
@@ -156,58 +203,57 @@ char *string_trim_whitespace(char *const s);
  * regular Latin characters - i.e. it will not wrap
  * correctly any text containing so-called 'wide' Unicode
  * characters (e.g. CJK languages, emojis, etc.).
- *
- * @param dst             pointer to destination buffer.
- * @param dst_size        size of destination buffer.
- * @param src             pointer to input string.
- * @param line_width      max number of characters per line.
- * @param wideglyph_width not used, but is necessary to keep
- *                        compatibility with word_wrap_wideglyph().
- * @param max_lines       max lines of destination string.
- *                        0 means no limit.
- */
-void word_wrap(char *dst, size_t dst_size, const char *src,
+ **/
+size_t word_wrap(char *dst, size_t dst_size, const char *src, size_t src_len,
       int line_width, int wideglyph_width, unsigned max_lines);
 
-/*
- * Wraps string specified by 'src' to destination buffer
- * specified by 'dst' and 'dst_size'.
+/**
+ * word_wrap_wideglyph:
+ * @dst                : pointer to destination buffer.
+ * @dst_size           : size of destination buffer.
+ * @src                : pointer to input string.
+ * @src_len            : length of @src
+ * @line_width         : max number of characters per line.
+ * @wideglyph_width    : effective width of 'wide' Unicode glyphs.
+ *                       the value here is normalised relative to the
+ *                       typical on-screen pixel width of a regular
+ *                       Latin character:
+ *                       - a regular Latin character is defined to
+ *                         have an effective width of 100
+ *                       - wideglyph_width = 100 * (wide_character_pixel_width / latin_character_pixel_width)
+ *                       - e.g. if 'wide' Unicode characters in 'src'
+ *                         have an on-screen pixel width twice that of
+ *                         regular Latin characters, wideglyph_width
+ *                         would be 200
+ * @max_lines          : max lines of destination string.
+ *                       0 means no limit.
+ *
+ * Wraps string specified by @src to destination buffer
+ * specified by @dst and @dst_size.
  * This function assumes that all glyphs in the string
  * are:
  * - EITHER 'non-wide' Unicode glyphs, with an on-screen
  *   pixel width similar to that of regular Latin characters
  * - OR 'wide' Unicode glyphs (e.g. CJK languages, emojis, etc.)
- *   with an on-screen pixel width defined by 'wideglyph_width'
+ *   with an on-screen pixel width defined by @wideglyph_width
  * Note that wrapping may occur in inappropriate locations
- * if 'src' string contains 'wide' Unicode characters whose
+ * if @src string contains 'wide' Unicode characters whose
  * on-screen pixel width deviates greatly from the set
- * 'wideglyph_width' value.
- *
- * @param dst             pointer to destination buffer.
- * @param dst_size        size of destination buffer.
- * @param src             pointer to input string.
- * @param line_width      max number of characters per line.
- * @param wideglyph_width effective width of 'wide' Unicode glyphs.
- *                        the value here is normalised relative to the
- *                        typical on-screen pixel width of a regular
- *                        Latin character:
- *                        - a regular Latin character is defined to
- *                          have an effective width of 100
- *                        - wideglyph_width = 100 * (wide_character_pixel_width / latin_character_pixel_width)
- *                        - e.g. if 'wide' Unicode characters in 'src'
- *                          have an on-screen pixel width twice that of
- *                          regular Latin characters, wideglyph_width
- *                          would be 200
- * @param max_lines       max lines of destination string.
- *                        0 means no limit.
- */
-void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src,
-      int line_width, int wideglyph_width, unsigned max_lines);
+ * @wideglyph_width value.
+ **/
+size_t word_wrap_wideglyph(
+      char *dst, size_t dst_size,
+      const char *src, size_t src_len,
+      int line_width, int wideglyph_width,
+      unsigned max_lines);
 
-/* Splits string into tokens seperated by 'delim'
+/**
+ * string_tokenize:
+ *
+ * Splits string into tokens seperated by @delim
  * > Returned token string must be free()'d
  * > Returns NULL if token is not found
- * > After each call, 'str' is set to the position after the
+ * > After each call, @str is set to the position after the
  *   last found token
  * > Tokens *include* empty strings
  * Usage example:
@@ -220,29 +266,120 @@ void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src,
  *        free(token);
  *        token = NULL;
  *    }
- */
+ **/
 char* string_tokenize(char **str, const char *delim);
 
-/* Removes every instance of character 'c' from 'str' */
+/**
+ * string_remove_all_chars:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ *
+ * Leaf function.
+ *
+ * Removes every instance of character @c from @str
+ **/
 void string_remove_all_chars(char *str, char c);
 
-/* Replaces every instance of character 'find' in 'str'
- * with character 'replace' */
+/**
+ * string_replace_all_chars:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ * @find               : character to find
+ * @replace            : character to replace @find with
+ *
+ * Hidden non-leaf function cost:
+ * - Calls strchr (in a loop)
+ *
+ * Replaces every instance of character @find in @str
+ * with character @replace
+ **/
 void string_replace_all_chars(char *str, char find, char replace);
 
-/* Converts string to unsigned integer.
- * Returns 0 if string is invalid  */
+/**
+ * string_to_unsigned:
+ * @str                : input string
+ *
+ * Converts string to unsigned integer.
+ *
+ * @return 0 if string is invalid, otherwise > 0
+ **/
 unsigned string_to_unsigned(const char *str);
 
-/* Converts hexadecimal string to unsigned integer.
+/**
+ * string_hex_to_unsigned:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ *
+ * Converts hexadecimal string to unsigned integer.
  * Handles optional leading '0x'.
- * Returns 0 if string is invalid  */
+ *
+ * @return 0 if string is invalid, otherwise > 0
+ **/
 unsigned string_hex_to_unsigned(const char *str);
 
 char *string_init(const char *src);
 
 void string_set(char **string, const char *src);
 
+/**
+ * string_count_occurrences_single_character:
+ *
+ * Leaf function.
+ *
+ * Get the total number of occurrences of character @c in @str.
+ *
+ * @return Total number of occurrences of character @c
+ */
+int string_count_occurrences_single_character(const char *str, char c);
+
+/**
+ * string_replace_whitespace_with_single_character:
+ *
+ * Leaf function.
+ *
+ * Replaces all spaces with given character @c.
+ **/
+void string_replace_whitespace_with_single_character(char *str, char c);
+
+/**
+ * string_replace_multi_space_with_single_space:
+ *
+ * Leaf function.
+ *
+ * Replaces multiple spaces with a single space in a string.
+ **/
+void string_replace_multi_space_with_single_space(char *str);
+
+/**
+ * string_remove_all_whitespace:
+ *
+ * Leaf function.
+ *
+ * Remove all spaces from the given string.
+ **/
+void string_remove_all_whitespace(char *str_trimmed, const char *str);
+
+/* Retrieve the last occurance of the given character in a string. */
+int string_index_last_occurance(const char *str, char c);
+
+/**
+ * string_find_index_substring_string:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ * @substr             : substring to find in @str
+ *
+ * Hidden non-leaf function cost:
+ * - Calls strstr
+ *
+ * Find the position of substring @substr in string @str.
+ **/
+int string_find_index_substring_string(const char *str, const char *substr);
+
+/**
+ * string_copy_only_ascii:
+ *
+ * Leaf function.
+ *
+ * Strips non-ASCII characters from a string.
+ **/
+void string_copy_only_ascii(char *str_stripped, const char *str);
+
 extern const unsigned char lr_char_props[256];
 
 RETRO_END_DECLS
diff --git a/libgambatte/libretro-common/include/vfs/vfs_implementation.h b/libgambatte/libretro-common/include/vfs/vfs_implementation.h
index c7d6bb0..b88d2f3 100644
--- a/libgambatte/libretro-common/include/vfs/vfs_implementation.h
+++ b/libgambatte/libretro-common/include/vfs/vfs_implementation.h
@@ -71,6 +71,12 @@ bool retro_vfs_dirent_is_dir_impl(libretro_vfs_implementation_dir *dirstream);
 
 int retro_vfs_closedir_impl(libretro_vfs_implementation_dir *dirstream);
 
+#ifdef __WINRT__
+
+void uwp_set_acl(const wchar_t* path, const wchar_t* AccessString);
+
+#endif
+
 RETRO_END_DECLS
 
 #endif
diff --git a/libgambatte/libretro-common/streams/file_stream.c b/libgambatte/libretro-common/streams/file_stream.c
index 3543dcc..befb31c 100644
--- a/libgambatte/libretro-common/streams/file_stream.c
+++ b/libgambatte/libretro-common/streams/file_stream.c
@@ -25,7 +25,6 @@
 #include <string.h>
 #include <stdarg.h>
 #include <ctype.h>
-#include <errno.h>
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
@@ -46,7 +45,6 @@ struct RFILE
 {
    struct retro_vfs_file_handle *hfile;
 	bool error_flag;
-	bool eof_flag;
 };
 
 static retro_vfs_get_path_t filestream_get_path_cb = NULL;
@@ -109,18 +107,14 @@ bool filestream_exists(const char *path)
 
    if (!path || !*path)
       return false;
-
-   dummy                  = filestream_open(
+   if (!(dummy = filestream_open(
          path,
          RETRO_VFS_FILE_ACCESS_READ,
-         RETRO_VFS_FILE_ACCESS_HINT_NONE);
-
-   if (!dummy)
+         RETRO_VFS_FILE_ACCESS_HINT_NONE)))
       return false;
 
    if (filestream_close(dummy) != 0)
-      if (dummy)
-         free(dummy);
+      free(dummy);
 
    dummy = NULL;
    return true;
@@ -165,7 +159,7 @@ int64_t filestream_truncate(RFILE *stream, int64_t length)
  * @hints              :
  *
  * Opens a file for reading or writing, depending on the requested mode.
- * Returns a pointer to an RFILE if opened successfully, otherwise NULL.
+ * @return A pointer to an RFILE if opened successfully, otherwise NULL.
  **/
 RFILE* filestream_open(const char *path, unsigned mode, unsigned hints)
 {
@@ -184,7 +178,6 @@ RFILE* filestream_open(const char *path, unsigned mode, unsigned hints)
 
    output             = (RFILE*)malloc(sizeof(RFILE));
    output->error_flag = false;
-   output->eof_flag   = false;
    output->hfile      = fp;
    return output;
 }
@@ -226,7 +219,7 @@ int filestream_vscanf(RFILE *stream, const char* format, va_list *args)
    char buf[4096];
    char subfmt[64];
    va_list args_copy;
-   const char * bufiter = buf;
+   const char *bufiter  = buf;
    int        ret       = 0;
    int64_t startpos     = filestream_tell(stream);
    int64_t maxlen       = filestream_read(stream, buf, sizeof(buf)-1);
@@ -241,7 +234,11 @@ int filestream_vscanf(RFILE *stream, const char* format, va_list *args)
     *   cause the va_list to have an indeterminate value
     *   in the function calling filestream_vscanf(),
     *   leading to unexpected behaviour */
+#ifdef __va_copy
+   __va_copy(args_copy, *args);
+#else
    va_copy(args_copy, *args);
+#endif
 
    while (*format)
    {
@@ -333,7 +330,7 @@ int filestream_vscanf(RFILE *stream, const char* format, va_list *args)
    }
 
    va_end(args_copy);
-   filestream_seek(stream, startpos+(bufiter-buf),
+   filestream_seek(stream, startpos + (bufiter - buf),
          RETRO_VFS_SEEK_POSITION_START);
 
    return ret;
@@ -363,14 +360,12 @@ int64_t filestream_seek(RFILE *stream, int64_t offset, int seek_position)
    if (output == VFS_ERROR_RETURN_VALUE)
       stream->error_flag = true;
 
-   stream->eof_flag      = false;
-
    return output;
 }
 
 int filestream_eof(RFILE *stream)
 {
-   return stream->eof_flag;
+   return filestream_tell(stream) == filestream_get_size(stream) ? EOF : 0;
 }
 
 int64_t filestream_tell(RFILE *stream)
@@ -395,7 +390,6 @@ void filestream_rewind(RFILE *stream)
       return;
    filestream_seek(stream, 0L, RETRO_VFS_SEEK_POSITION_START);
    stream->error_flag = false;
-   stream->eof_flag   = false;
 }
 
 int64_t filestream_read(RFILE *stream, void *s, int64_t len)
@@ -410,8 +404,6 @@ int64_t filestream_read(RFILE *stream, void *s, int64_t len)
 
    if (output == VFS_ERROR_RETURN_VALUE)
       stream->error_flag = true;
-   if (output < len)
-      stream->eof_flag   = true;
 
    return output;
 }
@@ -509,9 +501,7 @@ int filestream_printf(RFILE *stream, const char* format, ...)
 
 int filestream_error(RFILE *stream)
 {
-   if (stream && stream->error_flag)
-      return 1;
-   return 0;
+   return (stream && stream->error_flag);
 }
 
 int filestream_close(RFILE *stream)
@@ -540,7 +530,7 @@ int filestream_close(RFILE *stream)
  *
  * Read the contents of a file into @buf.
  *
- * Returns: non zero on success.
+ * @return Non-zero on success.
  */
 int64_t filestream_read_file(const char *path, void **buf, int64_t *len)
 {
@@ -557,25 +547,20 @@ int64_t filestream_read_file(const char *path, void **buf, int64_t *len)
       return 0;
    }
 
-   content_buf_size = filestream_get_size(file);
-
-   if (content_buf_size < 0)
+   if ((content_buf_size = filestream_get_size(file)) < 0)
       goto error;
 
-   content_buf      = malloc((size_t)(content_buf_size + 1));
-
-   if (!content_buf)
+   if (!(content_buf = malloc((size_t)(content_buf_size + 1))))
       goto error;
    if ((int64_t)(uint64_t)(content_buf_size + 1) != (content_buf_size + 1))
       goto error;
 
-   ret = filestream_read(file, content_buf, (int64_t)content_buf_size);
-   if (ret < 0)
+   if ((ret = filestream_read(file, content_buf, (int64_t)content_buf_size)) <
+         0)
       goto error;
 
    if (filestream_close(file) != 0)
-      if (file)
-         free(file);
+      free(file);
 
    *buf    = content_buf;
 
@@ -589,9 +574,8 @@ int64_t filestream_read_file(const char *path, void **buf, int64_t *len)
    return 1;
 
 error:
-   if (file)
-      if (filestream_close(file) != 0)
-         free(file);
+   if (filestream_close(file) != 0)
+      free(file);
    if (content_buf)
       free(content_buf);
    if (len)
@@ -608,8 +592,8 @@ error:
  *
  * Writes data to a file.
  *
- * Returns: true (1) on success, false (0) otherwise.
- */
+ * @return true on success, otherwise false.
+ **/
 bool filestream_write_file(const char *path, const void *data, int64_t size)
 {
    int64_t ret   = 0;
@@ -618,20 +602,18 @@ bool filestream_write_file(const char *path, const void *data, int64_t size)
          RETRO_VFS_FILE_ACCESS_HINT_NONE);
    if (!file)
       return false;
-
    ret = filestream_write(file, data, size);
    if (filestream_close(file) != 0)
-      if (file)
-         free(file);
-
-   if (ret != size)
-      return false;
-
-   return true;
+      free(file);
+   return (ret == size);
 }
 
-/* Returned pointer must be freed by the caller. */
-char* filestream_getline(RFILE *stream)
+/**
+ * filestream_getline:
+ *
+ * Returned pointer must be freed by the caller.
+ **/
+char *filestream_getline(RFILE *stream)
 {
    char *newline_tmp  = NULL;
    size_t cur_size    = 8;
@@ -646,16 +628,15 @@ char* filestream_getline(RFILE *stream)
       return NULL;
    }
 
-   in                 = filestream_getc(stream);
+   in = filestream_getc(stream);
 
    while (in != EOF && in != '\n')
    {
       if (idx == cur_size)
       {
          cur_size    *= 2;
-         newline_tmp  = (char*)realloc(newline, cur_size + 1);
 
-         if (!newline_tmp)
+         if (!(newline_tmp = (char*)realloc(newline, cur_size + 1)))
          {
             free(newline);
             return NULL;
diff --git a/libgambatte/libretro-common/streams/file_stream_transforms.c b/libgambatte/libretro-common/streams/file_stream_transforms.c
index cc6965f..e94a311 100644
--- a/libgambatte/libretro-common/streams/file_stream_transforms.c
+++ b/libgambatte/libretro-common/streams/file_stream_transforms.c
@@ -69,17 +69,27 @@ RFILE* rfopen(const char *path, const char *mode)
 
 int rfclose(RFILE* stream)
 {
+   if (!stream)
+      return EOF;
+
    return filestream_close(stream);
 }
 
 int64_t rftell(RFILE* stream)
 {
+   if (!stream)
+      return -1;
+
    return filestream_tell(stream);
 }
 
 int64_t rfseek(RFILE* stream, int64_t offset, int origin)
 {
    int seek_position = -1;
+
+   if (!stream)
+      return -1;
+
    switch (origin)
    {
       case SEEK_SET:
@@ -99,39 +109,61 @@ int64_t rfseek(RFILE* stream, int64_t offset, int origin)
 int64_t rfread(void* buffer,
    size_t elem_size, size_t elem_count, RFILE* stream)
 {
+   if (!stream || (elem_size == 0) || (elem_count == 0))
+      return 0;
+
    return (filestream_read(stream, buffer, elem_size * elem_count) / elem_size);
 }
 
 char *rfgets(char *buffer, int maxCount, RFILE* stream)
 {
+   if (!stream)
+      return NULL;
+
    return filestream_gets(stream, buffer, maxCount);
 }
 
 int rfgetc(RFILE* stream)
 {
+   if (!stream)
+      return EOF;
+
    return filestream_getc(stream);
 }
 
 int64_t rfwrite(void const* buffer,
    size_t elem_size, size_t elem_count, RFILE* stream)
 {
-   return filestream_write(stream, buffer, elem_size * elem_count);
+   if (!stream || (elem_size == 0) || (elem_count == 0))
+      return 0;
+
+   return (filestream_write(stream, buffer, elem_size * elem_count) / elem_size);
 }
 
 int rfputc(int character, RFILE * stream)
 {
-    return filestream_putc(stream, character);
+   if (!stream)
+      return EOF;
+
+   return filestream_putc(stream, character);
 }
 
 int64_t rfflush(RFILE * stream)
 {
-    return filestream_flush(stream);
+   if (!stream)
+      return EOF;
+
+   return filestream_flush(stream);
 }
 
 int rfprintf(RFILE * stream, const char * format, ...)
 {
    int result;
    va_list vl;
+
+   if (!stream)
+      return -1;
+
    va_start(vl, format);
    result = filestream_vprintf(stream, format, vl);
    va_end(vl);
@@ -152,6 +184,10 @@ int rfscanf(RFILE * stream, const char * format, ...)
 {
    int result;
    va_list vl;
+
+   if (!stream)
+      return 0;
+
    va_start(vl, format);
    result = filestream_vscanf(stream, format, &vl);
    va_end(vl);
diff --git a/libgambatte/libretro-common/string/stdstring.c b/libgambatte/libretro-common/string/stdstring.c
index d637988..7f05883 100644
--- a/libgambatte/libretro-common/string/stdstring.c
+++ b/libgambatte/libretro-common/string/stdstring.c
@@ -24,6 +24,7 @@
 #include <ctype.h>
 #include <string.h>
 
+#include <compat/strl.h>
 #include <string/stdstring.h>
 #include <encodings/utf.h>
 
@@ -89,9 +90,11 @@ char *string_ucwords(char *s)
 }
 
 char *string_replace_substring(const char *in,
-      const char *pattern, const char *replacement)
+      const char *pattern, size_t pattern_len,
+      const char *replacement, size_t replacement_len)
 {
-   size_t numhits, pattern_len, replacement_len, outlen;
+   size_t outlen;
+   size_t numhits     = 0;
    const char *inat   = NULL;
    const char *inprev = NULL;
    char          *out = NULL;
@@ -102,9 +105,6 @@ char *string_replace_substring(const char *in,
    if (!pattern || !replacement)
       return strdup(in);
 
-   pattern_len     = strlen(pattern);
-   replacement_len = strlen(replacement);
-   numhits         = 0;
    inat            = in;
 
    while ((inat = strstr(inat, pattern)))
@@ -114,9 +114,8 @@ char *string_replace_substring(const char *in,
    }
 
    outlen          = strlen(in) - pattern_len*numhits + replacement_len*numhits;
-   out             = (char *)malloc(outlen+1);
 
-   if (!out)
+   if (!(out = (char *)malloc(outlen+1)))
       return NULL;
 
    outat           = out;
@@ -129,7 +128,7 @@ char *string_replace_substring(const char *in,
       outat += inat-inprev;
       memcpy(outat, replacement, replacement_len);
       outat += replacement_len;
-      inat += pattern_len;
+      inat  += pattern_len;
       inprev = inat;
    }
    strcpy(outat, inprev);
@@ -137,7 +136,11 @@ char *string_replace_substring(const char *in,
    return out;
 }
 
-/* Remove leading whitespaces */
+/**
+ * string_trim_whitespace_left:
+ *
+ * Remove leading whitespaces
+ **/
 char *string_trim_whitespace_left(char *const s)
 {
    if (s && *s)
@@ -158,7 +161,11 @@ char *string_trim_whitespace_left(char *const s)
    return s;
 }
 
-/* Remove trailing whitespaces */
+/**
+ * string_trim_whitespace_right:
+ *
+ * Remove trailing whitespaces
+ **/
 char *string_trim_whitespace_right(char *const s)
 {
    if (s && *s)
@@ -178,7 +185,11 @@ char *string_trim_whitespace_right(char *const s)
    return s;
 }
 
-/* Remove leading and trailing whitespaces */
+/**
+ * string_trim_whitespace:
+ *
+ * Remove leading and trailing whitespaces
+ **/
 char *string_trim_whitespace(char *const s)
 {
    string_trim_whitespace_right(s);  /* order matters */
@@ -187,49 +198,62 @@ char *string_trim_whitespace(char *const s)
    return s;
 }
 
-void word_wrap(char *dst, size_t dst_size, const char *src, int line_width, int wideglyph_width, unsigned max_lines)
+/**
+ * word_wrap:
+ * @dst                : pointer to destination buffer.
+ * @dst_size           : size of destination buffer.
+ * @src                : pointer to input string.
+ * @line_width         : max number of characters per line.
+ * @wideglyph_width    : not used, but is necessary to keep
+ *                       compatibility with word_wrap_wideglyph().
+ * @max_lines          : max lines of destination string.
+ *                       0 means no limit.
+ *
+ * Wraps string specified by 'src' to destination buffer
+ * specified by 'dst' and 'dst_size'.
+ * This function assumes that all glyphs in the string
+ * have an on-screen pixel width similar to that of
+ * regular Latin characters - i.e. it will not wrap
+ * correctly any text containing so-called 'wide' Unicode
+ * characters (e.g. CJK languages, emojis, etc.).
+ **/
+size_t word_wrap(
+      char *dst,       size_t dst_size,
+      const char *src, size_t src_len,
+      int line_width,  int wideglyph_width, unsigned max_lines)
 {
-   char *lastspace     = NULL;
+   char *last_space    = NULL;
    unsigned counter    = 0;
    unsigned lines      = 1;
-   size_t src_len      = strlen(src);
    const char *src_end = src + src_len;
 
    /* Prevent buffer overflow */
    if (dst_size < src_len + 1)
-      return;
+      return 0;
 
    /* Early return if src string length is less
     * than line width */
-   if (src_len < line_width)
-   {
-      strcpy(dst, src);
-      return;
-   }
+   if (src_len < (size_t)line_width)
+      return strlcpy(dst, src, dst_size);
 
    while (*src != '\0')
    {
-      unsigned char_len;
-
-      char_len = (unsigned)(utf8skip(src, 1) - src);
+      unsigned char_len = (unsigned)(utf8skip(src, 1) - src);
       counter++;
 
       if (*src == ' ')
-         lastspace = dst; /* Remember the location of the whitespace */
+         last_space = dst; /* Remember the location of the whitespace */
       else if (*src == '\n')
       {
          /* If newlines embedded in the input,
           * reset the index */
          lines++;
-         counter = 0;
+         counter   = 0;
 
          /* Early return if remaining src string
           * length is less than line width */
          if (src_end - src <= line_width)
-         {
-            strcpy(dst, src);
-            return;
-         }
+            return strlcpy(dst, src, dst_size);
      }
 
       while (char_len--)
@@ -239,36 +263,69 @@ void word_wrap(char *dst, size_t dst_size, const char *src, int line_width, int
       {
          counter = 0;
 
-         if (lastspace && (max_lines == 0 || lines < max_lines))
+         if (last_space && (max_lines == 0 || lines < max_lines))
          {
             /* Replace nearest (previous) whitespace
              * with newline character */
-            *lastspace = '\n';
+            *last_space = '\n';
             lines++;
 
-            src -= dst - lastspace - 1;
-            dst = lastspace + 1;
-            lastspace  = NULL;
+            src        -= dst - last_space - 1;
+            dst         = last_space + 1;
+            last_space  = NULL;
 
             /* Early return if remaining src string
              * length is less than line width */
             if (src_end - src < line_width)
-            {
-               strcpy(dst, src);
-               return;
-            }
+               return strlcpy(dst, src, dst_size);
          }
       }
    }
 
    *dst = '\0';
+   return 0;
 }
 
-void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_width, int wideglyph_width, unsigned max_lines)
+/**
+ * word_wrap_wideglyph:
+ * @dst                : pointer to destination buffer.
+ * @dst_size           : size of destination buffer.
+ * @src                : pointer to input string.
+ * @line_width         : max number of characters per line.
+ * @wideglyph_width    : effective width of 'wide' Unicode glyphs.
+ *                       the value here is normalised relative to the
+ *                       typical on-screen pixel width of a regular
+ *                       Latin character:
+ *                       - a regular Latin character is defined to
+ *                         have an effective width of 100
+ *                       - wideglyph_width = 100 * (wide_character_pixel_width / latin_character_pixel_width)
+ *                       - e.g. if 'wide' Unicode characters in 'src'
+ *                         have an on-screen pixel width twice that of
+ *                         regular Latin characters, wideglyph_width
+ *                         would be 200
+ * @max_lines          : max lines of destination string.
+ *                       0 means no limit.
+ *
+ * Wraps string specified by @src to destination buffer
+ * specified by @dst and @dst_size.
+ * This function assumes that all glyphs in the string
+ * are:
+ * - EITHER 'non-wide' Unicode glyphs, with an on-screen
+ *   pixel width similar to that of regular Latin characters
+ * - OR 'wide' Unicode glyphs (e.g. CJK languages, emojis, etc.)
+ *   with an on-screen pixel width defined by @wideglyph_width
+ * Note that wrapping may occur in inappropriate locations
+ * if @src string contains 'wide' Unicode characters whose
+ * on-screen pixel width deviates greatly from the set
+ * @wideglyph_width value.
+ **/
+size_t word_wrap_wideglyph(char *dst, size_t dst_size,
+      const char *src, size_t src_len, int line_width,
+      int wideglyph_width, unsigned max_lines)
 {
    char *lastspace                   = NULL;
    char *lastwideglyph               = NULL;
-   const char *src_end               = src + strlen(src);
+   const char *src_end               = src + src_len;
    unsigned lines                    = 1;
    /* 'line_width' means max numbers of characters per line,
     * but this metric is only meaningful when dealing with
@@ -294,20 +351,15 @@ void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_w
    unsigned counter_normalized       = 0;
    int line_width_normalized         = line_width * 100;
    int additional_counter_normalized = wideglyph_width - 100;
- 
+
    /* Early return if src string length is less
     * than line width */
    if (src_end - src < line_width)
-   {
-      strlcpy(dst, src, dst_size);
-      return;
-   }
+      return strlcpy(dst, src, dst_size);
 
    while (*src != '\0')
    {
-      unsigned char_len;
-
-      char_len = (unsigned)(utf8skip(src, 1) - src);
+      unsigned char_len   = (unsigned)(utf8skip(src, 1) - src);
       counter_normalized += 100;
 
       /* Prevent buffer overflow */
@@ -315,7 +367,7 @@ void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_w
          break;
 
       if (*src == ' ')
-         lastspace = dst; /* Remember the location of the whitespace */
+         lastspace          = dst; /* Remember the location of the whitespace */
       else if (*src == '\n')
       {
          /* If newlines embedded in the input,
@@ -326,16 +378,13 @@ void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_w
          /* Early return if remaining src string
           * length is less than line width */
          if (src_end - src <= line_width)
-         {
-            strlcpy(dst, src, dst_size);
-            return;
-         }
+            return strlcpy(dst, src, dst_size);
       }
       else if (char_len >= 3)
       {
          /* Remember the location of the first byte
           * whose length as UTF-8 >= 3*/
-         lastwideglyph = dst;
+         lastwideglyph       = dst;
          counter_normalized += additional_counter_normalized;
       }
 
@@ -354,17 +403,14 @@ void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_w
             /* Insert newline character */
             *lastwideglyph = '\n';
             lines++;
-            src -= dst - lastwideglyph;
-            dst = lastwideglyph + 1;
-            lastwideglyph = NULL;
+            src           -= dst - lastwideglyph;
+            dst            = lastwideglyph + 1;
+            lastwideglyph  = NULL;
 
             /* Early return if remaining src string
              * length is less than line width */
             if (src_end - src <= line_width)
-            {
-               strlcpy(dst, src, dst_size);
-               return;
-            }
+               return strlcpy(dst, src, dst_size);
          }
          else if (lastspace)
          {
@@ -372,28 +418,29 @@ void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_w
              * with newline character */
             *lastspace = '\n';
             lines++;
-            src -= dst - lastspace - 1;
-            dst = lastspace + 1;
-            lastspace = NULL;
+            src       -= dst - lastspace - 1;
+            dst        = lastspace + 1;
+            lastspace  = NULL;
 
             /* Early return if remaining src string
              * length is less than line width */
             if (src_end - src < line_width)
-            {
-               strlcpy(dst, src, dst_size);
-               return;
-            }
+               return strlcpy(dst, src, dst_size);
          }
       }
    }
 
    *dst = '\0';
+   return 0;
 }
 
-/* Splits string into tokens seperated by 'delim'
+/**
+ * string_tokenize:
+ *
+ * Splits string into tokens seperated by @delim
  * > Returned token string must be free()'d
  * > Returns NULL if token is not found
- * > After each call, 'str' is set to the position after the
+ * > After each call, @str is set to the position after the
  *   last found token
  * > Tokens *include* empty strings
  * Usage example:
@@ -406,7 +453,7 @@ void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_w
  *        free(token);
  *        token = NULL;
  *    }
- */
+ **/
 char* string_tokenize(char **str, const char *delim)
 {
    /* Taken from https://codereview.stackexchange.com/questions/216956/strtok-function-thread-safe-supports-empty-tokens-doesnt-change-string# */
@@ -419,25 +466,20 @@ char* string_tokenize(char **str, const char *delim)
    if (!str || string_is_empty(delim))
       return NULL;
 
-   str_ptr = *str;
 
    /* Note: we don't check string_is_empty() here,
     * empty strings are valid */
-   if (!str_ptr)
+   if (!(str_ptr = *str))
       return NULL;
 
    /* Search for delimiter */
-   delim_ptr = strstr(str_ptr, delim);
-
-   if (delim_ptr)
+   if ((delim_ptr = strstr(str_ptr, delim)))
       token_len = delim_ptr - str_ptr;
    else
       token_len = strlen(str_ptr);
 
    /* Allocate token string */
-   token = (char *)malloc((token_len + 1) * sizeof(char));
-
-   if (!token)
+   if (!(token = (char *)malloc((token_len + 1) * sizeof(char))))
       return NULL;
 
    /* Copy token */
@@ -450,42 +492,53 @@ char* string_tokenize(char **str, const char *delim)
    return token;
 }
 
-/* Removes every instance of character 'c' from 'str' */
+/**
+ * string_remove_all_chars:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ *
+ * Leaf function.
+ *
+ * Removes every instance of character @c from @str
+ **/
 void string_remove_all_chars(char *str, char c)
 {
-   char *read_ptr  = NULL;
-   char *write_ptr = NULL;
-
-   if (string_is_empty(str))
-      return;
-
-   read_ptr  = str;
-   write_ptr = str;
+   char *read_ptr  = str;
+   char *write_ptr = str;
 
    while (*read_ptr != '\0')
    {
       *write_ptr = *read_ptr++;
-      write_ptr += (*write_ptr != c) ? 1 : 0;
+      if (*write_ptr != c)
+         write_ptr++;
    }
 
    *write_ptr = '\0';
 }
 
-/* Replaces every instance of character 'find' in 'str'
- * with character 'replace' */
+/**
+ * string_replace_all_chars:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ * @find               : character to find
+ * @replace            : character to replace @find with
+ *
+ * Replaces every instance of character @find in @str
+ * with character @replace
+ **/
 void string_replace_all_chars(char *str, char find, char replace)
 {
    char *str_ptr = str;
-
-   if (string_is_empty(str))
-      return;
-
    while ((str_ptr = strchr(str_ptr, find)))
       *str_ptr++ = replace;
 }
 
-/* Converts string to unsigned integer.
- * Returns 0 if string is invalid  */
+/**
+ * string_to_unsigned:
+ * @str                : input string
+ *
+ * Converts string to unsigned integer.
+ *
+ * @return 0 if string is invalid, otherwise > 0
+ **/
 unsigned string_to_unsigned(const char *str)
 {
    const char *ptr = NULL;
@@ -502,27 +555,33 @@ unsigned string_to_unsigned(const char *str)
    return (unsigned)strtoul(str, NULL, 10);
 }
 
-/* Converts hexadecimal string to unsigned integer.
+/**
+ * string_hex_to_unsigned:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ *
+ * Converts hexadecimal string to unsigned integer.
  * Handles optional leading '0x'.
- * Returns 0 if string is invalid  */
+ *
+ * @return 0 if string is invalid, otherwise > 0
+ **/
 unsigned string_hex_to_unsigned(const char *str)
 {
    const char *hex_str = str;
    const char *ptr     = NULL;
-   size_t len;
-
-   if (string_is_empty(str))
-      return 0;
 
    /* Remove leading '0x', if required */
-   len = strlen(str);
-
-   if (len >= 2)
-      if ((str[0] == '0') &&
-          ((str[1] == 'x') || (str[1] == 'X')))
+   if (str[0] != '\0' && str[1] != '\0')
+   {
+      if ( (str[0] == '0') &&
+          ((str[1] == 'x') ||
+           (str[1] == 'X')))
+      {
          hex_str = str + 2;
-
-   if (string_is_empty(hex_str))
+         if (string_is_empty(hex_str))
+            return 0;
+      }
+   }
+   else
       return 0;
 
    /* Check for valid characters */
@@ -534,3 +593,117 @@ unsigned string_hex_to_unsigned(const char *str)
 
    return (unsigned)strtoul(hex_str, NULL, 16);
 }
+
+/**
+ * string_count_occurrences_single_character:
+ *
+ * Leaf function.
+ *
+ * Get the total number of occurrences of character @c in @str.
+ *
+ * @return Total number of occurrences of character @c
+ */
+int string_count_occurrences_single_character(const char *str, char c)
+{
+   int count = 0;
+
+   for (; *str; str++)
+      if (*str == c)
+         count++;
+
+   return count;
+}
+
+/**
+ * string_replace_whitespace_with_single_character:
+ *
+ * Leaf function.
+ *
+ * Replaces all spaces with given character @c.
+ **/
+void string_replace_whitespace_with_single_character(char *str, char c)
+{
+   for (; *str; str++)
+      if (ISSPACE(*str))
+         *str = c;
+}
+
+/**
+ * string_replace_multi_space_with_single_space:
+ *
+ * Leaf function.
+ *
+ * Replaces multiple spaces with a single space in a string.
+ **/
+void string_replace_multi_space_with_single_space(char *str)
+{
+   char *str_trimmed  = str;
+   bool prev_is_space = false;
+   bool curr_is_space = false;
+
+   for (; *str; str++)
+   {
+      curr_is_space  = ISSPACE(*str);
+      if (prev_is_space && curr_is_space)
+         continue;
+      *str_trimmed++ = *str;
+      prev_is_space  = curr_is_space;
+   }
+   *str_trimmed = '\0';
+}
+
+/**
+ * string_remove_all_whitespace:
+ *
+ * Leaf function.
+ *
+ * Remove all spaces from the given string.
+ **/
+void string_remove_all_whitespace(char *str_trimmed, const char *str)
+{
+   for (; *str; str++)
+      if (!ISSPACE(*str))
+         *str_trimmed++ = *str;
+   *str_trimmed = '\0';
+}
+
+/**
+ * Retrieve the last occurance of the given character in a string.
+ */
+int string_index_last_occurance(const char *str, char c)
+{
+   const char *pos = strrchr(str, c);
+   if (pos)
+      return (int)(pos - str);
+   return -1;
+}
+
+/**
+ * string_find_index_substring_string:
+ * @str                : input string (must be non-NULL, otherwise UB)
+ * @substr             : substring to find in @str
+ *
+ * Find the position of substring @substr in string @str.
+ **/
+int string_find_index_substring_string(const char *str, const char *substr)
+{
+   const char *pos = strstr(str, substr);
+   if (pos)
+      return (int)(pos - str);
+   return -1;
+}
+
+/**
+ * string_copy_only_ascii:
+ *
+ * Leaf function.
+ *
+ * Strips non-ASCII characters from a string.
+ **/
+void string_copy_only_ascii(char *str_stripped, const char *str)
+{
+   for (; *str; str++)
+      if (*str > 0x1F && *str < 0x7F)
+         *str_stripped++ = *str;
+   *str_stripped = '\0';
+}
diff --git a/libgambatte/libretro-common/time/rtime.c b/libgambatte/libretro-common/time/rtime.c
index d66c228..fee0dab 100644
--- a/libgambatte/libretro-common/time/rtime.c
+++ b/libgambatte/libretro-common/time/rtime.c
@@ -22,7 +22,6 @@
 
 #ifdef HAVE_THREADS
 #include <rthreads/rthreads.h>
-#include <retro_assert.h>
 #include <stdlib.h>
 #endif
 
@@ -41,8 +40,6 @@ void rtime_init(void)
 #ifdef HAVE_THREADS
    if (!rtime_localtime_lock)
       rtime_localtime_lock = slock_new();
-
-   retro_assert(rtime_localtime_lock);
 #endif
 }
 
diff --git a/libgambatte/libretro-common/vfs/vfs_implementation.c b/libgambatte/libretro-common/vfs/vfs_implementation.c
index 7a24a95..2d958fe 100644
--- a/libgambatte/libretro-common/vfs/vfs_implementation.c
+++ b/libgambatte/libretro-common/vfs/vfs_implementation.c
@@ -26,7 +26,7 @@
 #include <errno.h>
 #include <sys/types.h>
 
-#include <string/stdstring.h>
+#include <string/stdstring.h> /* string_is_empty */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
@@ -57,11 +57,6 @@
 #  include <dirent.h>
 #  endif
 #  include <unistd.h>
-#  if defined(ORBIS)
-#  include <sys/fcntl.h>
-#  include <sys/dirent.h>
-#  include <orbisFile.h>
-#  endif
 #  if defined(WIIU)
 #  include <malloc.h>
 #  endif
@@ -74,11 +69,6 @@
 #  include <psp2/io/fcntl.h>
 #  include <psp2/io/dirent.h>
 #  include <psp2/io/stat.h>
-#elif defined(ORBIS)
-#  include <orbisFile.h>
-#  include <ps4link.h>
-#  include <sys/dirent.h>
-#  include <sys/fcntl.h>
 #elif !defined(_WIN32)
 #  if defined(PSP)
 #    include <pspiofilemgr.h>
@@ -124,19 +114,66 @@
 #include <unistd.h>
 #endif
 
-#if defined(ORBIS)
-#include <orbisFile.h>
-#include <sys/fcntl.h>
-#include <sys/dirent.h>
-#endif
+
 #if defined(PSP)
 #include <pspkernel.h>
 #endif
 
 #if defined(__PS3__) || defined(__PSL1GHT__)
-#include <defines/ps3_defines.h>
-#if defined(__PSL1GHT__)
+#define FS_SUCCEEDED 0
+#define FS_TYPE_DIR 1
+#ifdef __PSL1GHT__
 #include <lv2/sysfs.h>
+#ifndef O_RDONLY
+#define O_RDONLY SYS_O_RDONLY
+#endif
+#ifndef O_WRONLY
+#define O_WRONLY SYS_O_WRONLY
+#endif
+#ifndef O_CREAT
+#define O_CREAT SYS_O_CREAT
+#endif
+#ifndef O_TRUNC
+#define O_TRUNC SYS_O_TRUNC
+#endif
+#ifndef O_RDWR
+#define O_RDWR SYS_O_RDWR
+#endif
+#else
+#include <cell/cell_fs.h>
+#ifndef O_RDONLY
+#define O_RDONLY CELL_FS_O_RDONLY
+#endif
+#ifndef O_WRONLY
+#define O_WRONLY CELL_FS_O_WRONLY
+#endif
+#ifndef O_CREAT
+#define O_CREAT CELL_FS_O_CREAT
+#endif
+#ifndef O_TRUNC
+#define O_TRUNC CELL_FS_O_TRUNC
+#endif
+#ifndef O_RDWR
+#define O_RDWR CELL_FS_O_RDWR
+#endif
+#ifndef sysFsStat
+#define sysFsStat cellFsStat
+#endif
+#ifndef sysFSDirent
+#define sysFSDirent CellFsDirent
+#endif
+#ifndef sysFsOpendir
+#define sysFsOpendir cellFsOpendir
+#endif
+#ifndef sysFsReaddir
+#define sysFsReaddir cellFsReaddir
+#endif
+#ifndef sysFSDirent
+#define sysFSDirent CellFsDirent
+#endif
+#ifndef sysFsClosedir
+#define sysFsClosedir cellFsClosedir
+#endif
 #endif
 #endif
 
@@ -200,13 +237,6 @@ int64_t retro_vfs_file_seek_internal(
 #ifdef ATLEAST_VC2005
       /* VC2005 and up have a special 64-bit fseek */
       return _fseeki64(stream->fp, offset, whence);
-#elif defined(ORBIS)
-      {
-         int ret = orbisLseek(stream->fd, offset, whence);
-         if (ret < 0)
-            return -1;
-         return 0;
-      }
 #elif defined(HAVE_64BIT_OFFSETS)
       return fseeko(stream->fp, (off_t)offset, whence);
 #else
@@ -269,22 +299,9 @@ int64_t retro_vfs_file_seek_internal(
 libretro_vfs_implementation_file *retro_vfs_file_open_impl(
       const char *path, unsigned mode, unsigned hints)
 {
-#if defined(VFS_FRONTEND) || defined(HAVE_CDROM)
-   int                             path_len = (int)strlen(path);
-#endif
-#ifdef VFS_FRONTEND
-   const char                 *dumb_prefix  = "vfsonly://";
-   size_t                   dumb_prefix_siz = STRLEN_CONST("vfsonly://");
-   int                      dumb_prefix_len = (int)dumb_prefix_siz;
-#endif
-#ifdef HAVE_CDROM
-   const char *cdrom_prefix                 = "cdrom://";
-   size_t cdrom_prefix_siz                  = STRLEN_CONST("cdrom://");
-   int cdrom_prefix_len                     = (int)cdrom_prefix_siz;
-#endif
    int                                flags = 0;
    const char                     *mode_str = NULL;
-   libretro_vfs_implementation_file *stream = 
+   libretro_vfs_implementation_file *stream =
       (libretro_vfs_implementation_file*)
       malloc(sizeof(*stream));
 
@@ -306,9 +323,18 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
    stream->scheme                 = VFS_SCHEME_NONE;
 
 #ifdef VFS_FRONTEND
-   if (path_len >= dumb_prefix_len)
-      if (!memcmp(path, dumb_prefix, dumb_prefix_len))
-         path             += dumb_prefix_siz;
+   if (     path
+         && path[0] == 'v'
+         && path[1] == 'f'
+         && path[2] == 's'
+         && path[3] == 'o'
+         && path[4] == 'n'
+         && path[5] == 'l'
+         && path[6] == 'y'
+         && path[7] == ':'
+         && path[8] == '/'
+         && path[9] == '/')
+         path             += sizeof("vfsonly://")-1;
 #endif
 
 #ifdef HAVE_CDROM
@@ -325,13 +351,19 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
    stream->cdrom.last_frame[0]    = '\0';
    stream->cdrom.last_frame_valid = false;
 
-   if (path_len > cdrom_prefix_len)
+   if (     path
+         && path[0] == 'c'
+         && path[1] == 'd'
+         && path[2] == 'r'
+         && path[3] == 'o'
+         && path[4] == 'm'
+         && path[5] == ':'
+         && path[6] == '/'
+         && path[7] == '/'
+         && path[8] != '\0')
    {
-      if (!memcmp(path, cdrom_prefix, cdrom_prefix_len))
-      {
-         path             += cdrom_prefix_siz;
-         stream->scheme    = VFS_SCHEME_CDROM;
-      }
+      path             += sizeof("cdrom://")-1;
+      stream->scheme    = VFS_SCHEME_CDROM;
    }
 #endif
 
@@ -359,24 +391,20 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
          mode_str = "wb";
 
          flags    = O_WRONLY | O_CREAT | O_TRUNC;
-#if !defined(ORBIS)
 #if !defined(_WIN32)
          flags   |= S_IRUSR | S_IWUSR;
 #else
          flags   |= O_BINARY;
-#endif
 #endif
          break;
 
       case RETRO_VFS_FILE_ACCESS_READ_WRITE:
          mode_str = "w+b";
          flags    = O_RDWR | O_CREAT | O_TRUNC;
-#if !defined(ORBIS)
 #if !defined(_WIN32)
          flags   |= S_IRUSR | S_IWUSR;
 #else
          flags   |= O_BINARY;
-#endif
 #endif
          break;
 
@@ -385,12 +413,10 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
          mode_str = "r+b";
 
          flags    = O_RDWR;
-#if !defined(ORBIS)
 #if !defined(_WIN32)
          flags   |= S_IRUSR | S_IWUSR;
 #else
          flags   |= O_BINARY;
-#endif
 #endif
          break;
 
@@ -400,15 +426,6 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
 
    if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
    {
-#ifdef ORBIS
-      int fd = orbisOpen(path, flags, 0644);
-      if (fd < 0)
-      {
-         stream->fd = -1;
-         goto error;
-      }
-      stream->fd    = fd;
-#else
       FILE *fp;
 #ifdef HAVE_CDROM
       if (stream->scheme == VFS_SCHEME_CDROM)
@@ -425,25 +442,24 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
       else
 #endif
       {
-         fp = (FILE*)fopen_utf8(path, mode_str);
-
-         if (!fp)
+         if (!(fp = (FILE*)fopen_utf8(path, mode_str)))
             goto error;
 
          stream->fp  = fp;
       }
+
       /* Regarding setvbuf:
        *
        * https://www.freebsd.org/cgi/man.cgi?query=setvbuf&apropos=0&sektion=0&manpath=FreeBSD+11.1-RELEASE&arch=default&format=html
        *
-       * If the size argument is not zero but buf is NULL, 
+       * If the size argument is not zero but buf is NULL,
        * a buffer of the given size will be allocated immediately, and
        * released on close. This is an extension to ANSI C.
        *
-       * Since C89 does not support specifying a NULL buffer 
+       * Since C89 does not support specifying a NULL buffer
        * with a non-zero size, we create and track our own buffer for it.
        */
-      /* TODO: this is only useful for a few platforms, 
+      /* TODO: this is only useful for a few platforms,
        * find which and add ifdef */
 #if defined(_3DS)
       if (stream->scheme != VFS_SCHEME_CDROM)
@@ -455,19 +471,14 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
 #elif defined(WIIU)
       if (stream->scheme != VFS_SCHEME_CDROM)
       {
-         const int bufsize = 128*1024;
+         const int bufsize = 128 * 1024;
          stream->buf = (char*)memalign(0x40, bufsize);
          if (stream->fp)
             setvbuf(stream->fp, stream->buf, _IOFBF, bufsize);
-      }
-#elif !defined(PSP)
-      if (stream->scheme != VFS_SCHEME_CDROM)
-      {
          stream->buf = (char*)calloc(1, 0x4000);
          if (stream->fp)
             setvbuf(stream->fp, stream->buf, _IOFBF, 0x4000);
       }
-#endif
 #endif
    }
    else
@@ -503,18 +514,12 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
 
          retro_vfs_file_seek_internal(stream, 0, SEEK_SET);
 
-         stream->mapped = (uint8_t*)mmap((void*)0,
-               stream->mapsize, PROT_READ,  MAP_SHARED, stream->fd, 0);
-
-         if (stream->mapped == MAP_FAILED)
+         if ((stream->mapped = (uint8_t*)mmap((void*)0,
+               stream->mapsize, PROT_READ,  MAP_SHARED, stream->fd, 0)) == MAP_FAILED)
             stream->hints &= ~RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS;
       }
 #endif
    }
-#ifdef ORBIS
-   stream->size = orbisLseek(stream->fd, 0, SEEK_END);
-   orbisLseek(stream->fd, 0, SEEK_SET);
-#else
 #ifdef HAVE_CDROM
    if (stream->scheme == VFS_SCHEME_CDROM)
    {
@@ -535,7 +540,6 @@ libretro_vfs_implementation_file *retro_vfs_file_open_impl(
 
       retro_vfs_file_seek_internal(stream, 0, SEEK_SET);
    }
-#endif
    return stream;
 
 error:
@@ -570,14 +574,7 @@ int retro_vfs_file_close_impl(libretro_vfs_implementation_file *stream)
    }
 
    if (stream->fd > 0)
-   {
-#ifdef ORBIS
-      orbisClose(stream->fd);
-      stream->fd = -1;
-#else
       close(stream->fd);
-#endif
-   }
 #ifdef HAVE_CDROM
 end:
    if (stream->cdrom.cue_buf)
@@ -600,12 +597,7 @@ int retro_vfs_file_error_impl(libretro_vfs_implementation_file *stream)
    if (stream->scheme == VFS_SCHEME_CDROM)
       return retro_vfs_file_error_cdrom(stream);
 #endif
-#ifdef ORBIS
-   /* TODO/FIXME - implement this? */
-   return 0;
-#else
    return ferror(stream->fp);
-#endif
 }
 
 int64_t retro_vfs_file_size_impl(libretro_vfs_implementation_file *stream)
@@ -617,18 +609,20 @@ int64_t retro_vfs_file_size_impl(libretro_vfs_implementation_file *stream)
 
 int64_t retro_vfs_file_truncate_impl(libretro_vfs_implementation_file *stream, int64_t length)
 {
-   if (!stream)
-      return -1;
-
 #ifdef _WIN32
-   if (_chsize(_fileno(stream->fp), length) != 0)
-      return -1;
+   if (stream && _chsize(_fileno(stream->fp), length) == 0)
+   {
+	   stream->size = length;
+	   return 0;
+   }
 #elif !defined(VITA) && !defined(PSP) && !defined(PS2) && !defined(ORBIS) && (!defined(SWITCH) || defined(HAVE_LIBNX))
-   if (ftruncate(fileno(stream->fp), (off_t)length) != 0)
-      return -1;
+   if (stream && ftruncate(fileno(stream->fp), (off_t)length) == 0)
+   {
+      stream->size = length;
+      return 0;
+   }
 #endif
-
-   return 0;
+   return -1;
 }
 
 int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream)
@@ -642,14 +636,6 @@ int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream)
       if (stream->scheme == VFS_SCHEME_CDROM)
          return retro_vfs_file_tell_cdrom(stream);
 #endif
-#ifdef ORBIS
-      {
-         int64_t ret = orbisLseek(stream->fd, 0, SEEK_CUR);
-         if (ret < 0)
-            return -1;
-         return ret;
-      }
-#else
 #ifdef ATLEAST_VC2005
       /* VC2005 and up have a special 64-bit ftell */
       return _ftelli64(stream->fp);
@@ -657,13 +643,12 @@ int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream)
       return ftello(stream->fp);
 #else
       return ftell(stream->fp);
-#endif
 #endif
    }
 #ifdef HAVE_MMAP
    /* Need to check stream->mapped because this function
     * is called in filestream_open() */
-   if (stream->mapped && stream->hints & 
+   if (stream->mapped && stream->hints &
          RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
       return stream->mappos;
 #endif
@@ -676,21 +661,7 @@ int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream)
 int64_t retro_vfs_file_seek_impl(libretro_vfs_implementation_file *stream,
       int64_t offset, int seek_position)
 {
-   int whence = -1;
-   switch (seek_position)
-   {
-      case RETRO_VFS_SEEK_POSITION_START:
-         whence = SEEK_SET;
-         break;
-      case RETRO_VFS_SEEK_POSITION_CURRENT:
-         whence = SEEK_CUR;
-         break;
-      case RETRO_VFS_SEEK_POSITION_END:
-         whence = SEEK_END;
-         break;
-   }
-
-   return retro_vfs_file_seek_internal(stream, offset, whence);
+   return retro_vfs_file_seek_internal(stream, offset, seek_position);
 }
 
 int64_t retro_vfs_file_read_impl(libretro_vfs_implementation_file *stream,
@@ -705,13 +676,7 @@ int64_t retro_vfs_file_read_impl(libretro_vfs_implementation_file *stream,
       if (stream->scheme == VFS_SCHEME_CDROM)
          return retro_vfs_file_read_cdrom(stream, s, len);
 #endif
-#ifdef ORBIS
-      if (orbisRead(stream->fd, s, (size_t)len) < 0)
-         return -1;
-      return 0;
-#else
       return fread(s, 1, (size_t)len, stream->fp);
-#endif
    }
 #ifdef HAVE_MMAP
    if (stream->hints & RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
@@ -734,83 +699,80 @@ int64_t retro_vfs_file_read_impl(libretro_vfs_implementation_file *stream,
 
 int64_t retro_vfs_file_write_impl(libretro_vfs_implementation_file *stream, const void *s, uint64_t len)
 {
+   int64_t pos    = 0;
+   ssize_t result = -1;
+
    if (!stream)
       return -1;
 
    if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
    {
-#ifdef ORBIS
-      if (orbisWrite(stream->fd, s, (size_t)len) < 0)
-         return -1;
-      return 0;
-#else
-      return fwrite(s, 1, (size_t)len, stream->fp);
-#endif
-   }
+      pos    = retro_vfs_file_tell_impl(stream);
+      result = fwrite(s, 1, (size_t)len, stream->fp);
 
+      if (result != -1 && pos + result > stream->size)
+         stream->size = pos + result;
+
+      return result;
+   }
 #ifdef HAVE_MMAP
    if (stream->hints & RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
       return -1;
 #endif
-   return write(stream->fd, s, (size_t)len);
+
+   pos    = retro_vfs_file_tell_impl(stream);
+   result = write(stream->fd, s, (size_t)len);
+
+   if (result != -1 && pos + result > stream->size)
+      stream->size = pos + result;
+
+   return result;
 }
 
 int retro_vfs_file_flush_impl(libretro_vfs_implementation_file *stream)
 {
-   if (!stream)
-      return -1;
-#ifdef ORBIS
-   return 0;
-#else
-   return fflush(stream->fp) == 0 ? 0 : -1;
-#endif
+   if (stream && fflush(stream->fp) == 0)
+      return 0;
+   return -1;
 }
 
 int retro_vfs_file_remove_impl(const char *path)
 {
+   if (path && *path)
+   {
+      int ret          = -1;
 #if defined(_WIN32) && !defined(_XBOX)
-   /* Win32 (no Xbox) */
-
+      /* Win32 (no Xbox) */
 #if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500
-   char *path_local    = NULL;
+      char *path_local = NULL;
+      if ((path_local = utf8_to_local_string_alloc(path)))
+      {
+         /* We need to check if path is a directory */
+         if ((retro_vfs_stat_impl(path, NULL) & RETRO_VFS_STAT_IS_DIRECTORY) != 0)
+            ret = _rmdir(path_local);
+         else
+            ret = remove(path_local);
+         free(path_local);
+      }
 #else
-   wchar_t *path_wide  = NULL;
+      wchar_t *path_wide = NULL;
+      if ((path_wide = utf8_to_utf16_string_alloc(path)))
+      {
+         /* We need to check if path is a directory */
+         if ((retro_vfs_stat_impl(path, NULL) & RETRO_VFS_STAT_IS_DIRECTORY) != 0)
+            ret = _wrmdir(path_wide);
+         else
+            ret = _wremove(path_wide);
+         free(path_wide);
+      }
+#endif
+#else
+      ret = remove(path);
 #endif
-   if (!path || !*path)
-      return -1;
-#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500
-   path_local = utf8_to_local_string_alloc(path);
-
-   if (path_local)
-   {
-      int ret = remove(path_local);
-      free(path_local);
-
       if (ret == 0)
          return 0;
    }
-#else
-   path_wide = utf8_to_utf16_string_alloc(path);
-
-   if (path_wide)
-   {
-      int ret = _wremove(path_wide);
-      free(path_wide);
-
-      if (ret == 0)
-         return 0;
-   }
-#endif
    return -1;
-#elif defined(ORBIS)
-   /* Orbis
-    * TODO/FIXME - stub for now */
-   return 0;
-#else
-   if (remove(path) == 0)
-      return 0;
-   return -1;
-#endif
 }
 
 int retro_vfs_file_rename_impl(const char *old_path, const char *new_path)
@@ -862,13 +824,6 @@ int retro_vfs_file_rename_impl(const char *old_path, const char *new_path)
 #endif
    return ret;
 
-#elif defined(ORBIS)
-   /* Orbis */
-   /* TODO/FIXME - Stub for now */
-   if (!old_path || !*old_path || !new_path || !*new_path)
-      return -1;
-   return 0;
-
 #else
    /* Every other platform */
    if (!old_path || !*old_path || !new_path || !*new_path)
@@ -888,154 +843,123 @@ const char *retro_vfs_file_get_path_impl(
 
 int retro_vfs_stat_impl(const char *path, int32_t *size)
 {
-   bool is_dir               = false;
-   bool is_character_special = false;
-#if defined(VITA) || defined(PSP)
-   /* Vita / PSP */
-   SceIoStat buf;
-   int dir_ret;
-   char *tmp                 = NULL;
-   size_t len                = 0;
+   int ret                   = RETRO_VFS_STAT_IS_VALID;
 
    if (!path || !*path)
       return 0;
+   {
+#if defined(VITA)
+      /* Vita / PSP */
+      SceIoStat stat_buf;
+      int dir_ret;
+      char *tmp                 = strdup(path);
+      size_t len                = strlen(tmp);
+      if (tmp[len-1] == '/')
+         tmp[len-1]             = '\0';
 
-   tmp                       = strdup(path);
-   len                       = strlen(tmp);
-   if (tmp[len-1] == '/')
-      tmp[len-1] = '\0';
+      dir_ret                   = sceIoGetstat(tmp, &stat_buf);
+      free(tmp);
+      if (dir_ret < 0)
+         return 0;
 
-   dir_ret                   = sceIoGetstat(tmp, &buf);
-   free(tmp);
-   if (dir_ret < 0)
-      return 0;
+      if (size)
+         *size                  = (int32_t)stat_buf.st_size;
 
-   if (size)
-      *size                  = (int32_t)buf.st_size;
-
-   is_dir                    = FIO_S_ISDIR(buf.st_mode);
-#elif defined(ORBIS)
-   /* Orbis */
-   int dir_ret               = 0;
-
-   if (!path || !*path)
-      return 0;
-
-   if (size)
-      *size                  = (int32_t)buf.st_size;
-
-   dir_ret                   = orbisDopen(path);
-   is_dir                    = dir_ret > 0;
-   orbisDclose(dir_ret);
-
-   is_character_special      = S_ISCHR(buf.st_mode);
+      if (FIO_S_ISDIR(stat_buf.st_mode))
+         ret              |= RETRO_VFS_STAT_IS_DIRECTORY;
 #elif defined(__PSL1GHT__) || defined(__PS3__)
-   /* Lowlevel Lv2 */
-   sysFSStat buf;
+      /* Lowlevel Lv2 */
+      sysFSStat stat_buf;
 
-   if (!path || !*path)
-      return 0;
-   if (sysFsStat(path, &buf) < 0)
-      return 0;
+      if (sysFsStat(path, &stat_buf) < 0)
+         return 0;
 
-   if (size)
-      *size                  = (int32_t)buf.st_size;
+      if (size)
+         *size = (int32_t)stat_buf.st_size;
 
-   is_dir                    = ((buf.st_mode & S_IFMT) == S_IFDIR);
+      if ((stat_buf.st_mode & S_IFMT) == S_IFDIR)
+         ret  |= RETRO_VFS_STAT_IS_DIRECTORY;
 #elif defined(_WIN32)
-   /* Windows */
-   DWORD file_info;
-   struct _stat buf;
+      /* Windows */
+      struct _stat stat_buf;
 #if defined(LEGACY_WIN32)
-   char *path_local          = NULL;
+      char *path_local          = utf8_to_local_string_alloc(path);
+      DWORD file_info           = GetFileAttributes(path_local);
+
+      if (!string_is_empty(path_local))
+         _stat(path_local, &stat_buf);
+
+      if (path_local)
+         free(path_local);
 #else
-   wchar_t *path_wide        = NULL;
+      wchar_t *path_wide        = utf8_to_utf16_string_alloc(path);
+      DWORD file_info           = GetFileAttributesW(path_wide);
+
+      _wstat(path_wide, &stat_buf);
+
+      if (path_wide)
+         free(path_wide);
 #endif
+      if (file_info == INVALID_FILE_ATTRIBUTES)
+         return 0;
 
-   if (!path || !*path)
-      return 0;
-
-#if defined(LEGACY_WIN32)
-   path_local                = utf8_to_local_string_alloc(path);
-   file_info                 = GetFileAttributes(path_local);
-
-   if (!string_is_empty(path_local))
-      _stat(path_local, &buf);
-
-   if (path_local)
-      free(path_local);
-#else
-   path_wide                 = utf8_to_utf16_string_alloc(path);
-   file_info                 = GetFileAttributesW(path_wide);
-
-   _wstat(path_wide, &buf);
-
-   if (path_wide)
-      free(path_wide);
-#endif
-
-   if (file_info == INVALID_FILE_ATTRIBUTES)
-      return 0;
-
-   if (size)
-      *size = (int32_t)buf.st_size;
-
-   is_dir = (file_info & FILE_ATTRIBUTE_DIRECTORY);
+      if (size)
+         *size = (int32_t)stat_buf.st_size;
 
+      if (file_info & FILE_ATTRIBUTE_DIRECTORY)
+         ret  |= RETRO_VFS_STAT_IS_DIRECTORY;
 #elif defined(GEKKO)
-   /* On GEKKO platforms, paths cannot have
-    * trailing slashes - we must therefore
-    * remove them */
-   char *path_buf = NULL;
-   int stat_ret   = -1;
-   struct stat stat_buf;
-   size_t len;
+      /* On GEKKO platforms, paths cannot have
+       * trailing slashes - we must therefore
+       * remove them */
+      size_t len;
+      char *path_buf = NULL;
+      struct stat stat_buf;
 
-   if (string_is_empty(path))
-      return 0;
+      if (!(path_buf = strdup(path)))
+         return 0;
 
-   path_buf = strdup(path);
-   if (!path_buf)
-      return 0;
+      if ((len = strlen(path_buf)) > 0)
+         if (path_buf[len - 1] == '/')
+            path_buf[len - 1] = '\0';
 
-   len = strlen(path_buf);
-   if (len > 0)
-      if (path_buf[len - 1] == '/')
-         path_buf[len - 1] = '\0';
+      if (stat(path_buf, &stat_buf) < 0)
+      {
+         free(path_buf);
+         return 0;
+      }
 
-   stat_ret = stat(path_buf, &stat_buf);
-   free(path_buf);
-
-   if (stat_ret < 0)
-      return 0;
-
-   if (size)
-      *size             = (int32_t)stat_buf.st_size;
-
-   is_dir               = S_ISDIR(stat_buf.st_mode);
-   is_character_special = S_ISCHR(stat_buf.st_mode);
+      free(path_buf);
+      
+      if (size)
+         *size = (int32_t)stat_buf.st_size;
 
+      if (S_ISDIR(stat_buf.st_mode))
+         ret |= RETRO_VFS_STAT_IS_DIRECTORY;
+      if (S_ISCHR(stat_buf.st_mode))
+         ret |= RETRO_VFS_STAT_IS_CHARACTER_SPECIAL;
 #else
-   /* Every other platform */
-   struct stat buf;
+      /* Every other platform */
+      struct stat stat_buf;
 
-   if (!path || !*path)
-      return 0;
-   if (stat(path, &buf) < 0)
-      return 0;
+      if (stat(path, &stat_buf) < 0)
+         return 0;
 
-   if (size)
-      *size             = (int32_t)buf.st_size;
+      if (size)
+         *size = (int32_t)stat_buf.st_size;
 
-   is_dir               = S_ISDIR(buf.st_mode);
-   is_character_special = S_ISCHR(buf.st_mode);
+      if (S_ISDIR(stat_buf.st_mode))
+         ret |= RETRO_VFS_STAT_IS_DIRECTORY;
+      if (S_ISCHR(stat_buf.st_mode))
+         ret |= RETRO_VFS_STAT_IS_CHARACTER_SPECIAL;
 #endif
-   return RETRO_VFS_STAT_IS_VALID | (is_dir ? RETRO_VFS_STAT_IS_DIRECTORY : 0) | (is_character_special ? RETRO_VFS_STAT_IS_CHARACTER_SPECIAL : 0);
+   }
+   return ret;
 }
 
 #if defined(VITA)
 #define path_mkdir_error(ret) (((ret) == SCE_ERROR_ERRNO_EEXIST))
-#elif defined(PSP) || defined(PS2) || defined(_3DS) || defined(WIIU) || defined(SWITCH) || defined(ORBIS)
+#elif defined(PSP) || defined(PS2) || defined(_3DS) || defined(WIIU) || defined(SWITCH)
 #define path_mkdir_error(ret) ((ret) == -1)
 #else
 #define path_mkdir_error(ret) ((ret) < 0 && errno == EEXIST)
@@ -1058,13 +982,11 @@ int retro_vfs_mkdir_impl(const char *dir)
 #endif
 #elif defined(IOS)
    int ret = mkdir(dir, 0755);
-#elif defined(VITA) || defined(PSP)
+#elif defined(VITA)
    int ret = sceIoMkdir(dir, 0777);
-#elif defined(ORBIS)
-   int ret = orbisMkdir(dir, 0755);
 #elif defined(__QNX__)
    int ret = mkdir(dir, 0777);
-#elif defined(GEKKO)
+#elif defined(GEKKO) || defined(WIIU)
    /* On GEKKO platforms, mkdir() fails if
     * the path has a trailing slash. We must
     * therefore remove it. */
@@ -1111,16 +1033,13 @@ struct libretro_vfs_implementation_dir
    HANDLE directory;
    bool next;
    char path[PATH_MAX_LENGTH];
-#elif defined(VITA) || defined(PSP)
+#elif defined(VITA)
    SceUID directory;
    SceIoDirent entry;
 #elif defined(__PSL1GHT__) || defined(__PS3__)
    int error;
    int directory;
    sysFSDirent entry;
-#elif defined(ORBIS)
-   int directory;
-   struct dirent entry;
 #else
    DIR *directory;
    const struct dirent *entry;
@@ -1131,7 +1050,7 @@ static bool dirent_check_error(libretro_vfs_implementation_dir *rdir)
 {
 #if defined(_WIN32)
    return (rdir->directory == INVALID_HANDLE_VALUE);
-#elif defined(VITA) || defined(PSP) || defined(ORBIS)
+#elif defined(VITA) || defined(ORBIS)
    return (rdir->directory < 0);
 #elif defined(__PSL1GHT__) || defined(__PS3__)
    return (rdir->error != FS_SUCCEEDED);
@@ -1144,7 +1063,6 @@ libretro_vfs_implementation_dir *retro_vfs_opendir_impl(
       const char *name, bool include_hidden)
 {
 #if defined(_WIN32)
-   unsigned path_len;
    char path_buf[1024];
    size_t copied      = 0;
 #if defined(LEGACY_WIN32)
@@ -1155,28 +1073,25 @@ libretro_vfs_implementation_dir *retro_vfs_opendir_impl(
 #endif
    libretro_vfs_implementation_dir *rdir;
 
-   /*Reject null or empty string paths*/
+   /* Reject NULL or empty string paths*/
    if (!name || (*name == 0))
       return NULL;
 
    /*Allocate RDIR struct. Tidied later with retro_closedir*/
-   rdir = (libretro_vfs_implementation_dir*)calloc(1, sizeof(*rdir));
-   if (!rdir)
+   if (!(rdir = (libretro_vfs_implementation_dir*)
+            calloc(1, sizeof(*rdir))))
       return NULL;
 
    rdir->orig_path       = strdup(name);
 
 #if defined(_WIN32)
-   path_buf[0]           = '\0';
-   path_len              = strlen(name);
-
    copied                = strlcpy(path_buf, name, sizeof(path_buf));
 
    /* Non-NT platforms don't like extra slashes in the path */
-   if (name[path_len - 1] != '\\')
-      path_buf[copied++]   = '\\';
+   if (path_buf[copied - 1] != '\\')
+      path_buf [copied++]  = '\\';
 
-   path_buf[copied]        = '*';
+   path_buf[copied  ]      = '*';
    path_buf[copied+1]      = '\0';
 
 #if defined(LEGACY_WIN32)
@@ -1193,15 +1108,13 @@ libretro_vfs_implementation_dir *retro_vfs_opendir_impl(
       free(path_wide);
 #endif
 
-#elif defined(VITA) || defined(PSP)
+#elif defined(VITA)
    rdir->directory       = sceIoDopen(name);
 #elif defined(_3DS)
    rdir->directory       = !string_is_empty(name) ? opendir(name) : NULL;
    rdir->entry           = NULL;
 #elif defined(__PSL1GHT__) || defined(__PS3__)
    rdir->error           = sysFsOpendir(name, &rdir->directory);
-#elif defined(ORBIS)
-   rdir->directory       = orbisDopen(name);
 #else
    rdir->directory       = opendir(name);
    rdir->entry           = NULL;
@@ -1233,14 +1146,12 @@ bool retro_vfs_readdir_impl(libretro_vfs_implementation_dir *rdir)
 
    rdir->next = true;
    return (rdir->directory != INVALID_HANDLE_VALUE);
-#elif defined(VITA) || defined(PSP)
+#elif defined(VITA)
    return (sceIoDread(rdir->directory, &rdir->entry) > 0);
 #elif defined(__PSL1GHT__) || defined(__PS3__)
    uint64_t nread;
    rdir->error = sysFsReaddir(rdir->directory, &rdir->entry, &nread);
    return (nread != 0);
-#elif defined(ORBIS)
-   return (orbisDread(rdir->directory, &rdir->entry) > 0);
 #else
    return ((rdir->entry = readdir(rdir->directory)) != NULL);
 #endif
@@ -1259,7 +1170,7 @@ const char *retro_vfs_dirent_get_name_impl(libretro_vfs_implementation_dir *rdir
    if (name)
       free(name);
    return (char*)rdir->entry.cFileName;
-#elif defined(VITA) || defined(PSP) || defined(ORBIS) || defined(__PSL1GHT__) || defined(__PS3__)
+#elif defined(VITA) || defined(__PSL1GHT__) || defined(__PS3__)
    return rdir->entry.d_name;
 #else
    if (!rdir || !rdir->entry)
@@ -1273,22 +1184,12 @@ bool retro_vfs_dirent_is_dir_impl(libretro_vfs_implementation_dir *rdir)
 #if defined(_WIN32)
    const WIN32_FIND_DATA *entry = (const WIN32_FIND_DATA*)&rdir->entry;
    return entry->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
-#elif defined(PSP) || defined(VITA)
-   const SceIoDirent *entry     = (const SceIoDirent*)&rdir->entry;
-#if defined(PSP)
-   return (entry->d_stat.st_attr & FIO_SO_IFDIR) == FIO_SO_IFDIR;
 #elif defined(VITA)
+   const SceIoDirent *entry     = (const SceIoDirent*)&rdir->entry;
    return SCE_S_ISDIR(entry->d_stat.st_mode);
-#endif
 #elif defined(__PSL1GHT__) || defined(__PS3__)
    sysFSDirent *entry          = (sysFSDirent*)&rdir->entry;
    return (entry->d_type == FS_TYPE_DIR);
-#elif defined(ORBIS)
-   const struct dirent *entry   = &rdir->entry;
-   if (entry->d_type == DT_DIR)
-      return true;
-   if (!(entry->d_type == DT_UNKNOWN || entry->d_type == DT_LNK))
-      return false;
 #else
    struct stat buf;
    char path[PATH_MAX_LENGTH];
@@ -1301,8 +1202,7 @@ bool retro_vfs_dirent_is_dir_impl(libretro_vfs_implementation_dir *rdir)
       return false;
 #endif
    /* dirent struct doesn't have d_type, do it the slow way ... */
-   path[0] = '\0';
-   fill_pathname_join(path, rdir->orig_path, retro_vfs_dirent_get_name_impl(rdir), sizeof(path));
+   fill_pathname_join_special(path, rdir->orig_path, retro_vfs_dirent_get_name_impl(rdir), sizeof(path));
    if (stat(path, &buf) < 0)
       return false;
    return S_ISDIR(buf.st_mode);
@@ -1317,12 +1217,10 @@ int retro_vfs_closedir_impl(libretro_vfs_implementation_dir *rdir)
 #if defined(_WIN32)
    if (rdir->directory != INVALID_HANDLE_VALUE)
       FindClose(rdir->directory);
-#elif defined(VITA) || defined(PSP)
+#elif defined(VITA)
    sceIoDclose(rdir->directory);
 #elif defined(__PSL1GHT__) || defined(__PS3__)
    rdir->error = sysFsClosedir(rdir->directory);
-#elif defined(ORBIS)
-   orbisDclose(rdir->directory);
 #else
    if (rdir->directory)
       closedir(rdir->directory);