From: WanBingjiang <wanbingjiang@webray.com.cn>
Date: Tue, 17 Mar 2026 02:19:08 +0000 (+0800)
Subject: mbsalign: validate ESC character before processing escape sequences
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=4d28a8c89772dd1668eec8511c823aed16331f74;p=thirdparty%2Futil-linux.git

mbsalign: validate ESC character before processing escape sequences

Only process escape sequences when the control character is ESC.
This prevents \n[ or \n( from being misidentified as escape sequences.

Signed-off-by: WanBingjiang <wanbingjiang@webray.com.cn>
---

diff --git a/lib/mbsalign.c b/lib/mbsalign.c
index 97627537f..3e79ad10b 100644
--- a/lib/mbsalign.c
+++ b/lib/mbsalign.c
@@ -43,8 +43,13 @@ size_t mbs_nwidth(const char *buf, size_t bufsz)
 
 	while (p && *p && p <= last) {
 		if (iscntrl((unsigned char) *p)) {
+			char ctrl_char = *p;
 			p++;
 
+			/* only process escape sequences if the control char is ESC */
+			if (ctrl_char != '\e')
+				continue;
+
 			/* try detect "\e[x;ym" and skip on success */
 			if (*p && *p == '[') {
 				const char *e = p;