Delimiter runs

src/util.c

@@ -81,3 +81,7 @@ void resetstring(struct string *str) {
 int isctrl(int c) {
 	return (0 <= c && c <= 0x1f) || c == 0x7f;
 }
+
+int ispunc(int c) {
+	return strchr("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~", c) != NULL;
+}