[PATCH 2/3] Win32: replace MSVCRT's fstat() with a Win32-based implementation

[Karsten Blees <karsten.blees@gmail.com>]

fstat() is the only stat-related CRT function for which we don't have a
full replacement yet (and thus the only reason to stick with MSVCRT's
'struct stat' definition).

Fully implement fstat(), in preparation of implementing a POSIX 2013
compatible 'struct stat' with nanosecond-precision file times.

Signed-off-by: Karsten Blees <blees@dcon.de>
---
 compat/mingw.c | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index ba3cfb0..6d73a3d 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -532,28 +532,38 @@ int mingw_fstat(int fd, struct stat *buf)
 {
 	HANDLE fh = (HANDLE)_get_osfhandle(fd);
 	BY_HANDLE_FILE_INFORMATION fdata;
+	DWORD avail;
 
 	if (fh == INVALID_HANDLE_VALUE) {
 		errno = EBADF;
 		return -1;
 	}
-	/* direct non-file handles to MS's fstat() */
-	if (GetFileType(fh) != FILE_TYPE_DISK)
-		return _fstati64(fd, buf);
 
-	if (GetFileInformationByHandle(fh, &fdata)) {
-		buf->st_ino = 0;
-		buf->st_gid = 0;
-		buf->st_uid = 0;
-		buf->st_nlink = 1;
+	/* initialize stat fields */
+	memset(buf, 0, sizeof(*buf));
+	buf->st_nlink = 1;
+
+	switch (GetFileType(fh) & ~FILE_TYPE_REMOTE) {
+	case FILE_TYPE_DISK:
+		if (!GetFileInformationByHandle(fh, &fdata))
+			break;
 		buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 		buf->st_size = fdata.nFileSizeLow |
 			(((off_t)fdata.nFileSizeHigh)<<32);
-		buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 		buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 		buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 		buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 		return 0;
+
+	case FILE_TYPE_CHAR:
+		buf->st_mode = _S_IFCHR;
+		return 0;
+
+	case FILE_TYPE_PIPE:
+		buf->st_mode = _S_IFIFO;
+		if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
+			buf->st_size = avail;
+		return 0;
 	}
 	errno = EBADF;
 	return -1;
-- 
2.3.0.3.ge7778af


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