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cp: long arguments when interpolating strings as \*[xyz args...]

Reported by Dirk-Wilhelm Peters <peters@schwertfisch.de>.

--- a/cp.c

+++ b/cp.c

@@ -26,7 +26,7 @@

 		i += utf8next(d + i, cp_noninext);

 	} else if (!n_cp && c == '[') {

 		c = cp_noninext();

-		while (i < NMLEN - 1 && c >= 0 && c != ']') {

+		while (i < len - 1 && c >= 0 && c != ']') {

 			d[i++] = c;

 			c = cp_noninext();

 		}