Re: PATCH: Re: Globbing for Empty Directories?

[Wayne Davison <wayned@users.sourceforge.net>]

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On Thu, Apr 01, 2004 at 07:43:35PM +0100, Peter Stephenson wrote:
> +qualnonemptydir(char *name, struct stat *buf, off_t days, char *str)

Here's a minor optimization for this function.  It avoids reading the
directory if the st_nlink count is greater than 2 (since this must mean
that it has subdirs, and hence is not empty).  I decided to move the
opendir() call down below this nlink test, so I had to pre-qualify the
name using S_ISDIR().

I believe that this is portable.  Any objections/hesitations?

..wayne..

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--- Src/glob.c	1 Apr 2004 18:33:22 -0000	1.32
+++ Src/glob.c	6 Apr 2004 17:04:48 -0000
@@ -2807,10 +2807,16 @@ qualsheval(char *name, struct stat *buf,
 static int
 qualnonemptydir(char *name, struct stat *buf, off_t days, char *str)
 {
-    DIR *dirh = opendir(name);
+    DIR *dirh;
     struct dirent *de;
 
-    if (dirh == NULL)
+    if (!S_ISDIR(buf->st_mode))
+	return 0;
+
+    if (buf->st_nlink > 2)
+	return 1;
+
+    if (!(dirh = opendir(name)))
 	return 0;
 
     while ((de = readdir(dirh))) {