Add default file name if URL is a directory, giving index.html behavior. From Kate

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5162 42af7a65-404d-4744-a932-0658087f49c3

apps/netutils/webserver/httpd_mmap.c

@@ -89,6 +89,18 @@ int httpd_mmap_open(const char *name, struct httpd_fs_file *file)
        return ERROR;
     }
 
+  if (S_ISDIR(st.st_mode)) 
+    {
+       errno = EISDIR;
+       return ERROR;
+    }
+
+  if (!S_ISREG(st.st_mode)) 
+    {
+       errno = ENOENT;
+       return ERROR;
+    }
+
   if (st.st_size > INT_MAX)
     {
        errno = EFBIG;