commit 545031a076d4b5712442a8fc2d983f1e9d9f4f79
from: Hiltjo Posthuma <hiltjo@codemadness.org>
date: Sun Oct 27 19:08:46 2024 UTC

util.c: output function might override errno and thus affect perror()

Original patch by Raymond Cole with some modifications, thanks!

commit - 475d8093cb8d29d5756937bfa9e0b3b9e415f632
commit + 545031a076d4b5712442a8fc2d983f1e9d9f4f79
blob - 96b82c980c4ce304d329fc60e582379ab0400993
blob + 8e26a51bd3a3b526d351c314a4916a2e64759a0e
--- util.c
+++ util.c
@@ -1,4 +1,5 @@
 /* See LICENSE file for copyright and license details. */
+#include <errno.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -10,17 +11,17 @@ void
 die(const char *fmt, ...)
 {
 	va_list ap;
+	int saved_errno;
 
+	saved_errno = errno;
+
 	va_start(ap, fmt);
 	vfprintf(stderr, fmt, ap);
 	va_end(ap);
 
-	if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
-		fputc(' ', stderr);
-		perror(NULL);
-	} else {
-		fputc('\n', stderr);
-	}
+	if (fmt[0] && fmt[strlen(fmt)-1] == ':')
+		fprintf(stderr, " %s", strerror(saved_errno));
+	fputc('\n', stderr);
 
 	exit(1);
 }