From 43f4934e6d6ef14e38baf1f007f2ccc09d2781dc Mon Sep 17 00:00:00 2001
From: Tomoyuki Sahara <tsahara@iij.ad.jp>
Date: Fri, 2 Nov 2012 10:48:39 +0900
Subject: printf("%s", NULL) is not safe on some platforms.

---
 tools/mruby/mruby.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/mruby/mruby.c b/tools/mruby/mruby.c
index 07d0da36c..acecc7c8e 100644
--- a/tools/mruby/mruby.c
+++ b/tools/mruby/mruby.c
@@ -168,7 +168,7 @@ showcallinfo(mrb_state *mrb)
 {
   mrb_callinfo *ci;
   mrb_int ciidx;
-  const char *filename, *sep;
+  const char *filename, *method, *sep;
   int i, line;
 
   printf("trace:\n");
@@ -199,11 +199,15 @@ showcallinfo(mrb_state *mrb)
     else
       sep = "#";
 
+    method = mrb_sym2name(mrb, ci->mid);
+    if (method == NULL)
+      method = "(???)";
+
     printf("\t[%d] %s:%d:in %s%s%s\n",
     	   i, filename, line,
 	   mrb_class_name(mrb, ci->proc->target_class),
 	   sep,
-	   mrb_sym2name(mrb, ci->mid));
+	   method);
   }
 }
 
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