From 4ddbe16d881bb8ea70f63ea55f92fa5bb4c7802d Mon Sep 17 00:00:00 2001
From: sin
Date: Wed, 4 Mar 2015 18:26:59 +0000
Subject: Fix mbsrtowcs() check

---
 include/wchar.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/wchar.h b/include/wchar.h
index 9e5413f..78485c0 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -41,10 +41,13 @@ __fortify_mbsrtowcs(wchar_t *d, const char **s,
                     size_t wn, mbstate_t *st)
 {
 	size_t bos = __builtin_object_size(d, 0);
+	size_t r;
 
-	if (wn > bos / sizeof(wchar_t))
+	bos /= sizeof(wchar_t);
+	r = mbsrtowcs(d, s, wn > bos ? bos : wn, st);
+	if (bos < wn && d && *s && r != (size_t)-1)
 		__builtin_trap();
-	return mbsrtowcs(d, s, wn, st);
+	return r;
 }
 
 static inline __attribute__ ((always_inline))
-- 
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