win32: use correct errno for fopen() of directory

We already fixed up errno when a directory was opened by open().
Do the same for fopen().  This allows grep to give a more useful
error message when it's asked to open a directory.

Adds 64 bytes.

(GitHub issue #521)

1 files changed, 6 insertions, 1 deletions

diff --git a/win32/mingw.c b/win32/mingw.c
index 061e7bac6..529381b43 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -284,12 +284,17 @@ ssize_t FAST_FUNC mingw_open_read_close(const char *fn, void *buf, size_t size)
 FILE *mingw_fopen (const char *filename, const char *otype)
 {
         int fd;
+        FILE *stream;
 
         if (get_dev_type(filename) == DEV_NULL)
                 filename = "nul";
         else if ((fd=get_dev_fd(filename)) >= 0)
                 return fdopen(fd, otype);
-        return fopen(filename, otype);
+        stream = fopen(filename, otype);
+        if (stream == NULL && errno == EACCES && strcmp(otype, "r") == 0 &&
+                        mingw_is_directory(filename))
+                errno = EISDIR;
+        return stream;
 }
 
 #undef read