win32: try to get link count for directories

On Unix the link count of a directory reflects the number of
subdirectories it contains.  Enhance readdir(3) to return file
types and use this to count subdirectories when stat(2) is called
for a directory.

As with other features that might slow down stat(2) this is
controlled by the build-time setting FEATURE_EXTRA_FILE_DATA.
(Commit d82db8e9a 'win32: make stat(2) fetch additional metadata').

(GitHub issue #254)

1 files changed, 11 insertions, 0 deletions

diff --git a/win32/dirent.c b/win32/dirent.c
index b7de19391..b5b379209 100644
--- a/win32/dirent.c
+++ b/win32/dirent.c
@@ -10,6 +10,17 @@ static inline void finddata2dirent(struct dirent *ent, WIN32_FIND_DATAA *fdata)
 {
         /* copy file name from WIN32_FIND_DATA to dirent */
         strcpy(ent->d_name, fdata->cFileName);
+
+#if ENABLE_FEATURE_EXTRA_FILE_DATA
+        if ((fdata->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
+                        (fdata->dwReserved0 == IO_REPARSE_TAG_SYMLINK ||
+                        fdata->dwReserved0 ==  IO_REPARSE_TAG_MOUNT_POINT))
+                ent->d_type = DT_LNK;
+        else if (fdata->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+                ent->d_type = DT_DIR;
+        else
+                ent->d_type = DT_REG;
+#endif
 }
 
 DIR *opendir(const char *name)