Don't call strlen() when we only need to look at the next character or two.

(closes issue #18042)
Reported by: wdoekes
Patches:
      astsvn-inefficient-ast-uri-decode.patch uploaded by wdoekes (license 717)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@302554 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/utils.c

@@ -419,7 +419,7 @@ void ast_uri_decode(char *s)
 	unsigned int tmp;
 
 	for (o = s; *s; s++, o++) {
-		if (*s == '%' && strlen(s) > 2 && sscanf(s + 1, "%2x", &tmp) == 1) {
+		if (*s == '%' && s[1] != '\0' && s[2] != '\0' && sscanf(s + 1, "%2x", &tmp) == 1) {
 			/* have '%', two chars and correct parsing */
 			*o = tmp;
 			s += 2;	/* Will be incremented once more when we break out */