From 54e1fc310d7dfdf8e85393e912959ad58cdc38a8 Mon Sep 17 00:00:00 2001
From: Jean-loup Gailly <jloup@gailly.net>
Date: Wed, 13 Jan 2010 14:54:52 +0100
Subject: [PATCH] Do not crash if zzgo run without arguments.

---
 zzgo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/zzgo.c b/zzgo.c
index 3e1adce..be21680 100644
--- a/zzgo.c
+++ b/zzgo.c
@@ -42,10 +42,10 @@ static struct engine *(*engine_init[E_MAX])(char *arg, struct board *b) = {
 
 static struct engine *init_engine(enum engine_id engine, char *e_arg, struct board *b)
 {
-	char *arg = strdup(e_arg);
+	char *arg = e_arg? strdup(e_arg) : e_arg;
 	assert(engine < E_MAX);
 	struct engine *e = engine_init[engine](arg, b);
-	free(arg);
+	if (arg) free(arg);
 	return e;
 }
 
-- 
2.11.4.GIT