git config: Don't rely on regexec() returning 1 on non-match

dotdash · gitster · commit 9e4bbeb95f5c · 2007-12-05T11:34:44.000-08:00
Some systems don't return 1 from regexec() when the pattern does not
match (notably HP-UX which returns 20).

Bug identified by Dscho and H.Merijn Brand.

Signed-off-by: Björn Steinbrink &lt;B.Steinbrink@gmx.de&gt;
Tested-by: H.Merijn Brand &lt;h.m.brand@xs4all.nl&gt;
Cc: Johannes Schindelin &lt;Johannes.Schindelin@gmx.de&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/builtin-config.c b/builtin-config.c
@@ -38,8 +38,7 @@ static int show_config(const char* key_, const char* value_)
 	if (use_key_regexp && regexec(key_regexp, key_, 0, NULL, 0))
 		return 0;
 	if (regexp != NULL &&
-			 (do_not_match ^
-			  regexec(regexp, (value_?value_:""), 0, NULL, 0)))
+	    (do_not_match ^ !!regexec(regexp, (value_?value_:""), 0, NULL, 0)))
 		return 0;
 
 	if (show_keys) {
