From 4b43b375b7abae22070cd86bfc26a8222233150e Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Wed, 31 Jan 2024 13:24:56 -0500
Subject: check for overlapping pointers

---
 src/stdio/vfprintf_s.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/stdio/vfprintf_s.c')

diff --git a/src/stdio/vfprintf_s.c b/src/stdio/vfprintf_s.c
index 941b03c0..b11f27e8 100644
--- a/src/stdio/vfprintf_s.c
+++ b/src/stdio/vfprintf_s.c
@@ -1,11 +1,14 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
 #include "_stdio.h"
 
 /** write formatted output to a file stream **/
 int vfprintf_s(FILE * restrict stream, const char * restrict format, va_list arg)
 {
 	SIGNAL_SAFE(0);
+	ASSERT_NOOVERLAP(stream, sizeof(*stream), format, strlen(format));
+
 	struct io_options opt = {
 		.fnname = __func__,
 		.stream = stream,
-- 
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