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/fopen.c | 2 ++
 1 file changed, 2 insertions(+)

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

diff --git a/src/stdio/fopen.c b/src/stdio/fopen.c
index e2ff7efc..4c9eabd7 100644
--- a/src/stdio/fopen.c
+++ b/src/stdio/fopen.c
@@ -1,6 +1,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "_stdio.h"
 
 /** open a file stream **/
@@ -11,6 +12,7 @@ FILE * fopen(const char * restrict filename, const char * restrict mode)
 	size_t i;
 
 	SIGNAL_SAFE(0);
+	ASSERT_NOOVERLAP(filename, strlen(filename), mode, strlen(mode));
 
 	for (i = 0; i < FOPEN_MAX; i++) {
 		if (__stdio.FILES[i].bmode == 0) {
-- 
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