escape control characters in SLT_Debug as %XX

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@916 d4fa192b-c00b-0410-8231-f00ffab90ce4

lib/libvarnishapi/shmlog.c

@@ -291,6 +291,17 @@ VSL_H_Print(void *priv, unsigned tag, unsigned fd, unsigned len, unsigned spec,
 
 	assert(fo != NULL);
 	if (tag == SLT_Debug) {
+		fprintf(fo, "%5d %-12s %c \"", fd, VSL_tags[tag],
+		    ((spec & VSL_S_CLIENT) ? 'c' : (spec & VSL_S_BACKEND) ? 'b' : ' '));
+		while (len-- > 0) {
+			if (*ptr >= ' ' && *ptr <= '~')
+				fprintf(fo, "%c", *ptr);
+			else
+				fprintf(fo, "%%%02x", *ptr);
+			ptr++;
+		}
+		fprintf(fo, "\"\n");
+		return (0);
 	}
 	fprintf(fo, "%5d %-12s %c %.*s\n",
 	    fd, VSL_tags[tag],