From 3de5006ae5530fa9568177005c59e0a4a808acc1 Mon Sep 17 00:00:00 2001
From: CismonX <admin@cismon.net>
Date: Sat, 11 Jan 2025 19:17:18 +0800
Subject: [PATCH] fsck_util: fix escape_control_chars()

Argument passed to iscntrl() must be representable as unsigned char.
---
 src/fsck_util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/fsck_util.c b/src/fsck_util.c
index 3cceee8..682ac51 100644
--- a/src/fsck_util.c
+++ b/src/fsck_util.c
@@ -86,7 +86,7 @@ escape_control_chars (
 ) {
     int cnt = 0;
     for (char *end = stpncpy(dst, src, dst_max); dst < end; ++dst) {
-        if (iscntrl(*dst)) {
+        if (iscntrl((unsigned char)(*dst))) {
             *dst = ch;
             ++cnt;
         }