win32: make stat(2) fetch additional metadata

Modify the WIN32 implementation of stat(2) to fetch inode number,
device id and number of hardlinks.  This requires opening a handle
to the target file so it will be slower.

A number of features can be enabled or start to work:

- tar can detect if an archive is being stored in itself;
- find can support the -inum and -links options;
- ls can display inode numbers;
- diff can detect attempts to compare a file with itself;
- du has better support for hardlinked files;
- cp can detect attempts to copy a file over itself.

1 files changed, 2 insertions, 1 deletions

diff --git a/editors/diff.c b/editors/diff.c
index 929beb054..815c8a915 100644
--- a/editors/diff.c
+++ b/editors/diff.c
@@ -1039,7 +1039,8 @@ int diff_main(int argc UNUSED_PARAM, char **argv)
          * single NFS file system, if a local device number (st_dev) exceeds
          * 255, or if a local inode number (st_ino) exceeds 16777215.
          */
-        if (ENABLE_DESKTOP && !ENABLE_PLATFORM_MINGW32
+        if (ENABLE_DESKTOP
+         && (!ENABLE_PLATFORM_MINGW32 || ENABLE_FEATURE_EXTRA_FILE_DATA)
          && stb[0].st_ino == stb[1].st_ino
          && stb[0].st_dev == stb[1].st_dev
          && stb[0].st_size == stb[1].st_size