Windows: Use a customized struct stat that also has the st_blocks member.

Windows's struct stat does not have a st_blocks member. Since we already
have our own stat/lstat/fstat implementations, we can just as well use
a customized struct stat. This patch introduces just that, and also fills
in the st_blocks member. On the other hand, we don't provide members that
are never used.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>

compat/mingw.c

@@ -31,6 +31,11 @@ static inline time_t filetime_to_time_t(const FILETIME *ft)
 	return (time_t)winTime;
 }
 
+static inline size_t size_to_blocks(size_t s)
+{
+	return (s+511)/512;
+}
+
 extern int _getdrive( void );
 /* We keep the do_lstat code in a separate function to avoid recursion.
  * When a path ends with a slash, the stat will fail with ENOENT. In
@@ -52,10 +57,10 @@ static int do_lstat(const char *file_name, struct stat *buf)
 		buf->st_ino = 0;
 		buf->st_gid = 0;
 		buf->st_uid = 0;
-		buf->st_nlink = 1;
 		buf->st_mode = fMode;
 		buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
-		buf->st_dev = buf->st_rdev = (_getdrive() - 1);
+		buf->st_blocks = size_to_blocks(buf->st_size);
+		buf->st_dev = _getdrive() - 1;
 		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));
@@ -89,7 +94,7 @@ static int do_lstat(const char *file_name, struct stat *buf)
  * complete. Note that Git stat()s are redirected to mingw_lstat()
  * too, since Windows doesn't really handle symlinks that well.
  */
-int mingw_lstat(const char *file_name, struct stat *buf)
+int mingw_lstat(const char *file_name, struct mingw_stat *buf)
 {
 	int namelen;
 	static char alt_name[PATH_MAX];
@@ -117,7 +122,8 @@ int mingw_lstat(const char *file_name, struct stat *buf)
 }
 
 #undef fstat
-int mingw_fstat(int fd, struct stat *buf)
+#undef stat
+int mingw_fstat(int fd, struct mingw_stat *buf)
 {
 	HANDLE fh = (HANDLE)_get_osfhandle(fd);
 	BY_HANDLE_FILE_INFORMATION fdata;
@@ -127,8 +133,22 @@ int mingw_fstat(int fd, struct stat *buf)
 		return -1;
 	}
 	/* direct non-file handles to MS's fstat() */
-	if (GetFileType(fh) != FILE_TYPE_DISK)
-		return fstat(fd, buf);
+	if (GetFileType(fh) != FILE_TYPE_DISK) {
+		struct stat st;
+		if (fstat(fd, &st))
+			return -1;
+		buf->st_ino = st.st_ino;
+		buf->st_gid = st.st_gid;
+		buf->st_uid = st.st_uid;
+		buf->st_mode = st.st_mode;
+		buf->st_size = st.st_size;
+		buf->st_blocks = size_to_blocks(buf->st_size);
+		buf->st_dev = st.st_dev;
+		buf->st_atime = st.st_atime;
+		buf->st_mtime = st.st_mtime;
+		buf->st_ctime = st.st_ctime;
+		return 0;
+	}
 
 	if (GetFileInformationByHandle(fh, &fdata)) {
 		int fMode = S_IREAD;
@@ -142,10 +162,10 @@ int mingw_fstat(int fd, struct stat *buf)
 		buf->st_ino = 0;
 		buf->st_gid = 0;
 		buf->st_uid = 0;
-		buf->st_nlink = 1;
 		buf->st_mode = fMode;
 		buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
-		buf->st_dev = buf->st_rdev = (_getdrive() - 1);
+		buf->st_blocks = size_to_blocks(buf->st_size);
+		buf->st_dev = _getdrive() - 1;
 		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));

compat/mingw.h

@@ -59,8 +59,6 @@ struct itimerval {
 };
 #define ITIMER_REAL 0
 
-#define st_blocks st_size/512	/* will be cleaned up later */
-
 /*
  * trivial stubs
  */
@@ -161,12 +159,22 @@ int mingw_rename(const char*, const char*);
 
 /* Use mingw_lstat() instead of lstat()/stat() and
  * mingw_fstat() instead of fstat() on Windows.
+ * struct stat is redefined because it lacks the st_blocks member.
  */
-int mingw_lstat(const char *file_name, struct stat *buf);
-int mingw_fstat(int fd, struct stat *buf);
+struct mingw_stat {
+	unsigned st_mode;
+	time_t st_mtime, st_atime, st_ctime;
+	unsigned st_dev, st_ino, st_uid, st_gid;
+	size_t st_size;
+	size_t st_blocks;
+};
+int mingw_lstat(const char *file_name, struct mingw_stat *buf);
+int mingw_fstat(int fd, struct mingw_stat *buf);
 #define fstat mingw_fstat
 #define lstat mingw_lstat
-#define stat(x,y) mingw_lstat(x,y)
+#define stat mingw_stat
+static inline int mingw_stat(const char *file_name, struct mingw_stat *buf)
+{ return mingw_lstat(file_name, buf); }
 
 int mingw_utime(const char *file_name, const struct utimbuf *times);
 #define utime mingw_utime