From 982e9e623501dc1c6655ca37fef505c3ec7af8d1 Mon Sep 17 00:00:00 2001
From: mame <mame@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 13 Jan 2018 13:08:05 +0000
Subject: [PATCH] string.c (struct mapping_buffer): Use FLEX_ARY_LEN

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61811 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 string.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/string.c b/string.c
index 798fd52e3c..22734e0e1b 100644
--- a/string.c
+++ b/string.c
@@ -6384,7 +6384,7 @@ typedef struct mapping_buffer {
     size_t capa;
     size_t used;
     struct mapping_buffer *next;
-    OnigUChar space[1];
+    OnigUChar space[FLEX_ARY_LEN];
 } mapping_buffer;
 
 static VALUE
@@ -6410,7 +6410,7 @@ rb_str_casemap(VALUE source, OnigCaseFoldType *flags, rb_encoding *enc)
 	if (CASEMAP_DEBUG) {
 	    fprintf(stderr, "Buffer allocation, capa is %"PRIuSIZE"\n", capa); /* for tuning */
 	}
-	current_buffer->next = xmalloc(offsetof(mapping_buffer, space) + capa);
+	current_buffer->next = xmalloc(sizeof(mapping_buffer) + capa);
 	current_buffer = current_buffer->next;
 	current_buffer->next = NULL;
 	current_buffer->capa = capa;