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-rw-r--r--src/stdio/fprintf_s.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/stdio/fprintf_s.c b/src/stdio/fprintf_s.c
index 2e5ed670..83843f78 100644
--- a/src/stdio/fprintf_s.c
+++ b/src/stdio/fprintf_s.c
@@ -1,11 +1,13 @@
#include <stdio.h>
#include <stdarg.h>
+#include <string.h>
#include "_stdio.h"
/** write formatted output to a file stream **/
int fprintf_s(FILE * restrict stream, const char * restrict format, ...)
{
SIGNAL_SAFE(0);
+ ASSERT_NOOVERLAP(stream, sizeof(*stream), format, strlen(format));
int retval;
va_list ap;
va_start(ap, format);