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-rw-r--r--src/stdlib/mbtowc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stdlib/mbtowc.c b/src/stdlib/mbtowc.c
index c2780bf6..57ae03b9 100644
--- a/src/stdlib/mbtowc.c
+++ b/src/stdlib/mbtowc.c
@@ -7,6 +7,7 @@ int mbtowc(wchar_t * restrict pwc, const char * restrict s, size_t n)
{
SIGNAL_SAFE(0);
ASSERT_NOOVERLAP(pwc, sizeof(*pwc), s, n);
+ ASSERT_CTYPE(s);
/* FIXME: forward dependency on AMD1 */
#if 0