Win32: add lstat(), fetch st_dev and st_ino and fetch st_nlink for fstat

We need lstat() for various modules to work well with symlinks,
and the same modules often want to check for matches on the device
and inode number.

The values we're using for st_ino match those that the Python and Rust
libraries use, and Go uses the same volume and file index values for
testing if two stat objects refer to the same file.

They aren't entirely unique, given ReFS uses 128-bit file ids, but
the API used to check for this (GetFileInformationByHandleEx() for
FileIdInfo) is only available on server operating systems, so I can't
directly test it anyway.

1 files changed, 5 insertions, 1 deletions

diff --git a/dosish.h b/dosish.h
index 1860a0f066..3580693c90 100644
--- a/dosish.h
+++ b/dosish.h
@@ -70,7 +70,11 @@
  *	to include <sys/stat.h> and <sys/types.h> to get any typedef'ed
  *	information.
  */
-#define Stat_t struct _stati64
+#if defined(WIN32)
+#  define Stat_t struct w32_stat
+#else
+#  define Stat_t struct _stati64
+#endif
 
 /* USE_STAT_RDEV:
  *	This symbol is defined if this system has a stat structure declaring