Added "isDirectory" method to llvm::sys::Path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45168 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/System/Path.h

@@ -321,7 +321,7 @@ namespace sys {
       /// shared library.
       /// @brief Determine if the path reference a dynamic library.
       bool isDynamicLibrary() const;
-
+    
       /// This function determines if the path name references an existing file
       /// or directory in the file system.
       /// @returns true if the pathname references an existing file or
@@ -330,6 +330,12 @@ namespace sys {
       /// the file system.
       bool exists() const;
 
+      /// This function determines if the path name refences an 
+      /// existing directory.
+      /// @returns true if the pathname references an existing directory.
+      /// @brief Determins if the path is a directory in the file system.
+      bool isDirectory() const;
+    
       /// This function determines if the path name references a readable file
       /// or directory in the file system. This function checks for
       /// the existence and readability (by the current program) of the file

lib/System/Unix/Path.inc

@@ -288,6 +288,14 @@ Path::exists() const {
   return 0 == access(path.c_str(), F_OK );
 }
 
+bool
+Path::isDirectory() const {
+  struct stat buf;
+  if (0 != stat(path.c_str(), &buf))
+    return false;
+  return buf.st_mode & S_IFDIR ? true : false;
+}
+
 bool
 Path::canRead() const {
   return 0 == access(path.c_str(), F_OK | R_OK );

lib/System/Win32/Path.inc

@@ -253,6 +253,13 @@ Path::exists() const {
   return attr != INVALID_FILE_ATTRIBUTES;
 }
 
+bool
+Path::isDirectory() const {
+  DWORD attr = GetFileAttributes(path.c_str());
+  return (attr != INVALID_FILE_ATTRIBUTES) &&
+         (attr & FILE_ATTRIBUTE_DIRECTORY);
+}
+
 bool
 Path::canRead() const {
   // FIXME: take security attributes into account.