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, 3 insertions, 3 deletions

diff --git a/archival/tar.c b/archival/tar.c
index b9ae93004..54989b953 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -161,7 +161,7 @@ typedef struct TarBallInfo {
 # endif
         HardLinkInfo *hlInfoHead;       /* Hard Link Tracking Information */
         HardLinkInfo *hlInfo;           /* Hard Link Info for the current file */
-#if !ENABLE_PLATFORM_MINGW32
+#if !ENABLE_PLATFORM_MINGW32 || ENABLE_FEATURE_EXTRA_FILE_DATA
 //TODO: save only st_dev + st_ino
         struct stat tarFileStatBuf;     /* Stat info for the tarball, letting
                                          * us know the inode and device that the
@@ -529,7 +529,7 @@ static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statb
                 }
         }
 
-#if !ENABLE_PLATFORM_MINGW32
+#if !ENABLE_PLATFORM_MINGW32 || ENABLE_FEATURE_EXTRA_FILE_DATA
         /* It is a bad idea to store the archive we are in the process of creating,
          * so check the device and inode to be sure that this particular file isn't
          * the new tarball */
@@ -707,7 +707,7 @@ static NOINLINE int writeTarFile(
 
         /*tbInfo->hlInfoHead = NULL; - already is */
 
-#if !ENABLE_PLATFORM_MINGW32
+#if !ENABLE_PLATFORM_MINGW32 || ENABLE_FEATURE_EXTRA_FILE_DATA
         /* Store the stat info for the tarball's file, so
          * can avoid including the tarball into itself....  */
         xfstat(tbInfo->tarFd, &tbInfo->tarFileStatBuf, "can't stat tar file");