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/fputs.c | 3 +++
 1 file changed, 3 insertions(+)

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

diff --git a/src/stdio/fputs.c b/src/stdio/fputs.c
index a82338d1..c4d32dec 100644
--- a/src/stdio/fputs.c
+++ b/src/stdio/fputs.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #include "_stdio.h"
 
 /** write a string to a file stream **/
@@ -6,6 +7,8 @@
 int fputs(const char * restrict s, FILE * restrict stream)
 {
 	SIGNAL_SAFE(0);
+	ASSERT_NOOVERLAP(s, strlen(s), stream, sizeof(*stream));
+
 	flockfile(stream);
 	while (*s) {
 		if (fputc(*s++, stream) == EOF) {
-- 
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