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-rw-r--r--src/stdio/vsnprintf_s.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/stdio/vsnprintf_s.c b/src/stdio/vsnprintf_s.c
index 3d094fe5..2f980931 100644
--- a/src/stdio/vsnprintf_s.c
+++ b/src/stdio/vsnprintf_s.c
@@ -1,9 +1,12 @@
#include <stdio.h>
+#include <string.h>
#include "_stdio.h"
int vsnprintf_s(char * restrict s, rsize_t n, const char * restrict format, va_list arg)
{
SIGNAL_SAFE(0);
+ ASSERT_NOOVERLAP(s, n, format, strlen(format));
+
struct io_options opt = {
.fnname = __func__,
.string = s,