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.

2 files changed, 4 insertions, 1 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 0c7e03ee8..61574b5ee 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1712,7 +1712,7 @@ int bb_xioctl(int fd, unsigned request, void *argp) FAST_FUNC;
 #define xioctl(fd,request,argp)        bb_xioctl(fd,request,argp)
 #endif
 
-#if !ENABLE_PLATFORM_MINGW32
+#if !ENABLE_PLATFORM_MINGW32 || ENABLE_FEATURE_EXTRA_FILE_DATA
 char *is_in_ino_dev_hashtable(const struct stat *statbuf) FAST_FUNC;
 void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name) FAST_FUNC;
 void reset_ino_dev_hashtable(void) FAST_FUNC;
diff --git a/include/mingw.h b/include/mingw.h
index 185eb66ed..0f403b993 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -283,6 +283,9 @@ int mingw_chmod(const char *path, int mode);
 typedef int nlink_t;
 typedef int blksize_t;
 typedef off_t blkcnt_t;
+#if ENABLE_FEATURE_EXTRA_FILE_DATA
+#define ino_t uint64_t
+#endif
 
 struct mingw_stat {
         dev_t     st_dev;