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Win32: implement stat() with symlink support

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With respect to symlinks, the current stat() implementation is almost the
same as lstat(): except for the file type (st_mode & S_IFMT), it returns
information about the link rather than the target.

Implement stat by opening the file with as little permissions as possible
and calling GetFileInformationByHandle on it. This way, all link resoltion
is handled by the Windows file system layer.

If symlinks are disabled, use lstat() as before, but fail with ELOOP if a
symlink would have to be resolved.

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Karsten Blees
2015-05-16 01:18:14 +02:00
committed by Johannes Schindelin
parent 86ed1cb292
commit 17c17319b5
1 changed files with 18 additions and 1 deletions
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19
compat/mingw.c
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@@ -802,9 +802,26 @@ int mingw_lstat(const char *file_name, struct stat *buf)
{
return do_lstat(0, file_name, buf);
}
int mingw_stat(const char *file_name, struct stat *buf)
{
return do_lstat(1, file_name, buf);
wchar_t wfile_name[MAX_LONG_PATH];
HANDLE hnd;
int result;
/* open the file and let Windows resolve the links */
if (xutftowcs_long_path(wfile_name, file_name) < 0)
return -1;
hnd = CreateFileW(wfile_name, 0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hnd == INVALID_HANDLE_VALUE) {
errno = err_win_to_posix(GetLastError());
return -1;
}
result = get_file_info_by_handle(hnd, buf);
CloseHandle(hnd);
return result;
}
int mingw_fstat(int fd, struct stat *buf)