RetroArch/frontend/menu/file_browser.c

static bool directory_parse(void *data, const char *path)
{
   filebrowser_t *filebrowser = (filebrowser_t*)data;

   struct string_list *list = dir_list_new(path,
         filebrowser->current_dir.extensions, true);
   if(!list)
      return false;
   
   if (list->size)
      dir_list_sort(list, true);

   filebrowser->current_dir.ptr   = 0;
   strlcpy(filebrowser->current_dir.directory_path,
         path, sizeof(filebrowser->current_dir.directory_path));

   if (filebrowser->list)
      dir_list_free(filebrowser->list);

   filebrowser->list = list;

   return true;

}

static void filebrowser_free(void *data)
{
   filebrowser_t *filebrowser = (filebrowser_t*)data;

   dir_list_free(filebrowser->list);
   filebrowser->list = NULL;
   filebrowser->current_dir.ptr   = 0;
   free(filebrowser);
}

void filebrowser_set_root_and_ext(void *data, const char *ext, const char *root_dir)
{
   filebrowser_t *filebrowser = (filebrowser_t*)data;
   
   if (ext)
      strlcpy(filebrowser->current_dir.extensions, ext,
            sizeof(filebrowser->current_dir.extensions));

   strlcpy(filebrowser->current_dir.root_dir,
         root_dir, sizeof(filebrowser->current_dir.root_dir));
   filebrowser_iterate(filebrowser, FILEBROWSER_ACTION_RESET);
}

#define GET_CURRENT_PATH(browser) (browser->list->elems[browser->current_dir.ptr].data)

bool filebrowser_iterate(void *data, unsigned action)
{
   filebrowser_t *filebrowser = (filebrowser_t*)data;
   bool ret = true;
   unsigned entries_to_scroll = 19;

   switch(action)
   {
      case FILEBROWSER_ACTION_UP:
         if (!filebrowser->list->size)
            break;
         filebrowser->current_dir.ptr--;
         if (filebrowser->current_dir.ptr >= filebrowser->list->size)
            filebrowser->current_dir.ptr = filebrowser->list->size - 1;
         break;
      case FILEBROWSER_ACTION_DOWN:
         if (!filebrowser->list->size)
            break;
         filebrowser->current_dir.ptr++;
         if (filebrowser->current_dir.ptr >= filebrowser->list->size)
            filebrowser->current_dir.ptr = 0;
         break;
      case FILEBROWSER_ACTION_LEFT:
         if (!filebrowser->list->size)
            break;
         if (filebrowser->current_dir.ptr <= 5)
            filebrowser->current_dir.ptr = 0;
         else
            filebrowser->current_dir.ptr -= 5;
         break;
      case FILEBROWSER_ACTION_RIGHT:
         if (!filebrowser->list->size)
            break;
         filebrowser->current_dir.ptr = (min(filebrowser->current_dir.ptr + 5, 
                  filebrowser->list->size-1));
         break;
      case FILEBROWSER_ACTION_SCROLL_UP:
         if (!filebrowser->list->size)
            break;
         if (filebrowser->current_dir.ptr <= entries_to_scroll)
            filebrowser->current_dir.ptr= 0;
         else
            filebrowser->current_dir.ptr -= entries_to_scroll;
         break;
      case FILEBROWSER_ACTION_SCROLL_DOWN:
         if (!filebrowser->list->size)
            break;
         filebrowser->current_dir.ptr = (min(filebrowser->current_dir.ptr + 
                  entries_to_scroll, filebrowser->list->size-1));
         break;
      case FILEBROWSER_ACTION_OK:
         ret = directory_parse(filebrowser, GET_CURRENT_PATH(filebrowser));
         break;
      case FILEBROWSER_ACTION_CANCEL:
         fill_pathname_parent_dir(filebrowser->current_dir.directory_path,
               filebrowser->current_dir.directory_path,
               sizeof(filebrowser->current_dir.directory_path));

         ret = directory_parse(filebrowser, filebrowser->current_dir.directory_path);
         break;
      case FILEBROWSER_ACTION_RESET:
         ret = directory_parse(filebrowser, filebrowser->current_dir.root_dir);
         break;
      case FILEBROWSER_ACTION_RESET_CURRENT_DIR:
         ret = directory_parse(filebrowser, filebrowser->current_dir.directory_path);
         break;
      case FILEBROWSER_ACTION_PATH_ISDIR:
         ret = filebrowser->list->elems[filebrowser->current_dir.ptr].attr.b;
         break;
      case FILEBROWSER_ACTION_NOOP:
      default:
         break;
   }

   if (ret)
      strlcpy(filebrowser->current_dir.path, GET_CURRENT_PATH(filebrowser),
         sizeof(filebrowser->current_dir.path));

   return ret;
}

void filebrowser_update(void *data, uint64_t action_ori, const char *extensions)
{
   filebrowser_action_t action = FILEBROWSER_ACTION_NOOP;
   bool ret = true;

   switch (action_ori)
   {
      case RGUI_ACTION_DOWN:
         action = FILEBROWSER_ACTION_DOWN;
         break;
      case RGUI_ACTION_UP:
         action = FILEBROWSER_ACTION_UP;
         break;
      case RGUI_ACTION_RIGHT:
         action = FILEBROWSER_ACTION_RIGHT;
         break;
      case RGUI_ACTION_LEFT:
         action = FILEBROWSER_ACTION_LEFT;
         break;
      case RGUI_ACTION_SCROLL_DOWN:
         action = FILEBROWSER_ACTION_SCROLL_DOWN;
         break;
      case RGUI_ACTION_SCROLL_UP:
         action = FILEBROWSER_ACTION_SCROLL_UP;
         break;
      case RGUI_ACTION_CANCEL:
         {
            char tmp_str[PATH_MAX];
            fill_pathname_parent_dir(tmp_str, rgui->browser->current_dir.directory_path, sizeof(tmp_str));

            if (tmp_str[0] != '\0')
               action = FILEBROWSER_ACTION_CANCEL;
         }
         break;
      case RGUI_ACTION_START:
         action = FILEBROWSER_ACTION_RESET;
         filebrowser_set_root_and_ext(rgui->browser, NULL, default_paths.filesystem_root_dir);
         strlcpy(rgui->browser->current_dir.extensions, extensions,
               sizeof(rgui->browser->current_dir.extensions));
#ifdef HAVE_RMENU_XUI
         filebrowser_fetch_directory_entries(1ULL << RETRO_DEVICE_ID_JOYPAD_B);
#endif
         break;
   }

   if (action != FILEBROWSER_ACTION_NOOP)
      ret = filebrowser_iterate(rgui->browser, action);

   if (!ret)
      msg_queue_push(g_extern.msg_queue, "ERROR - Failed to open directory.", 1, 180);
}