merge revision(s) 36668: [Backport #6846]

	* test/ruby/test_file_exhaustive.rb
	  (TestFileExhaustive#test_stat_special_file): add a test.
	  GetFileAttributesExW fails to get attributes of special files
	  such as pagefile.sys.

	* win32/win32.c (check_valid_dir): for performance, check the path
	  by FindFirstFileW only if the path contains "...".

	* win32/win32.c (winnt_stat): use GetFileAttributesExW instead of
	  FindFirstFileW since GetFileAttributesExW is faster.
	  Based on the patch by Dusan D. Majkic.
	  [ruby-core:47083] [Feature #6845]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@36792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 41 insertions, 17 deletions

diff --git a/win32/win32.c b/win32/win32.c
index 253a462f23..7c2671f43a 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -4234,7 +4234,14 @@ static int
 check_valid_dir(const WCHAR *path)
 {
     WIN32_FIND_DATAW fd;
-    HANDLE fh = open_dir_handle(path, &fd);
+    HANDLE fh;
+
+    /* GetFileAttributes() determines "..." as directory. */
+    /* We recheck it by FindFirstFile(). */
+    if (wcsstr(path, L"...") == NULL)
+	return 0;
+
+    fh = open_dir_handle(path, &fd);
     if (fh == INVALID_HANDLE_VALUE)
 	return -1;
     FindClose(fh);
@@ -4246,6 +4253,7 @@ winnt_stat(const WCHAR *path, struct stati64 *st)
 {
     HANDLE h;
     WIN32_FIND_DATAW wfd;
+    WIN32_FILE_ATTRIBUTE_DATA wfa;
 
     memset(st, 0, sizeof(*st));
     st->st_nlink = 1;
@@ -4254,27 +4262,43 @@ winnt_stat(const WCHAR *path, struct stati64 *st)
 	errno = ENOENT;
 	return -1;
     }
-    h = FindFirstFileW(path, &wfd);
-    if (h != INVALID_HANDLE_VALUE) {
-	FindClose(h);
-	st->st_mode  = fileattr_to_unixmode(wfd.dwFileAttributes, path);
-	st->st_atime = filetime_to_unixtime(&wfd.ftLastAccessTime);
-	st->st_mtime = filetime_to_unixtime(&wfd.ftLastWriteTime);
-	st->st_ctime = filetime_to_unixtime(&wfd.ftCreationTime);
-	st->st_size = ((__int64)wfd.nFileSizeHigh << 32) | wfd.nFileSizeLow;
+    if (GetFileAttributesExW(path, GetFileExInfoStandard, (void*)&wfa)) {
+	if (wfa.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+	    if (check_valid_dir(path)) return -1;
+	    st->st_size = 0;
+	}
+	else {
+	    st->st_size = ((__int64)wfa.nFileSizeHigh << 32) | wfa.nFileSizeLow;
+	}
+	st->st_mode  = fileattr_to_unixmode(wfa.dwFileAttributes, path);
+	st->st_atime = filetime_to_unixtime(&wfa.ftLastAccessTime);
+	st->st_mtime = filetime_to_unixtime(&wfa.ftLastWriteTime);
+	st->st_ctime = filetime_to_unixtime(&wfa.ftCreationTime);
     }
     else {
-	// If runtime stat(2) is called for network shares, it fails on WinNT.
-	// Because GetDriveType returns 1 for network shares. (Win98 returns 4)
-	DWORD attr = GetFileAttributesW(path);
-	if (attr == (DWORD)-1L) {
-	    errno = map_errno(GetLastError());
+	/* GetFileAttributesEx failed; check why. */
+	int e = GetLastError();
+
+	if ((e == ERROR_FILE_NOT_FOUND) || (e == ERROR_INVALID_NAME)
+	    || (e == ERROR_PATH_NOT_FOUND || (e == ERROR_BAD_NETPATH))) {
+	    errno = map_errno(e);
 	    return -1;
 	}
-	if (attr & FILE_ATTRIBUTE_DIRECTORY) {
-	    if (check_valid_dir(path)) return -1;
+
+	/* Fall back to FindFirstFile for ERROR_SHARING_VIOLATION */
+	h = FindFirstFileW(path, &wfd);
+	if (h != INVALID_HANDLE_VALUE) {
+	    FindClose(h);
+	    st->st_mode  = fileattr_to_unixmode(wfd.dwFileAttributes, path);
+	    st->st_atime = filetime_to_unixtime(&wfd.ftLastAccessTime);
+	    st->st_mtime = filetime_to_unixtime(&wfd.ftLastWriteTime);
+	    st->st_ctime = filetime_to_unixtime(&wfd.ftCreationTime);
+	    st->st_size = ((__int64)wfd.nFileSizeHigh << 32) | wfd.nFileSizeLow;
+	}
+	else {
+	    errno = map_errno(GetLastError());
+	    return -1;
 	}
-	st->st_mode  = fileattr_to_unixmode(attr, path);
     }
 
     st->st_dev = st->st_rdev = (iswalpha(path[0]) && path[1] == L':') ?