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File _service:tar_scm:backport-Explicitly-override-only-newlines.patch of Package shadow (Revision 3443a5b5012cc1b60f510bdcfb20866e)

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From ffc480c2e93f05266e4b130229877ad13f71a8c0 Mon Sep 17 00:00:00 2001
From: Samanta Navarro <ferivoz@riseup.net>
Date: Mon, 30 Jan 2023 11:53:47 +0000
Subject: [PATCH] Explicitly override only newlines

Override only newlines with '\0' to avoid undesired truncation of
actual line content.

Signed-off-by: Samanta Navarro <ferivoz@riseup.net>
---
 lib/port.c        | 6 +++---
 libmisc/console.c | 3 ++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/port.c b/lib/port.c
index 0bea2ef4..90eb1498 100644
--- a/lib/port.c
+++ b/lib/port.c
@@ -130,8 +130,8 @@ static struct port *getportent (void)
       again:
 
 	/*
-	 * Get the next line and remove the last character, which
-	 * is a '\n'.  Lines which begin with '#' are all ignored.
+	 * Get the next line and remove optional trailing '\n'.
+	 * Lines which begin with '#' are all ignored.
 	 */
 
 	if (fgets (buf, (int) sizeof buf, ports) == 0) {
@@ -149,7 +149,7 @@ static struct port *getportent (void)
 	 * TTY devices.
 	 */
 
-	buf[strlen (buf) - 1] = 0;
+	buf[strcspn (buf, "\n")] = 0;
 
 	port.pt_names = ttys;
 	for (cp = buf, j = 0; j < PORT_TTY; j++) {
diff --git a/libmisc/console.c b/libmisc/console.c
index bc024eba..63d3ceb3 100644
--- a/libmisc/console.c
+++ b/libmisc/console.c
@@ -71,7 +71,8 @@ static bool is_listed (const char *cfgin, const char *tty, bool def)
 	 */
 
 	while (fgets (buf, (int) sizeof (buf), fp) != NULL) {
-		buf[strlen (buf) - 1] = '\0';
+		/* Remove optional trailing '\n'. */
+		buf[strcspn (buf, "\n")] = '\0';
 		if (strcmp (buf, tty) == 0) {
 			(void) fclose (fp);
 			return true;
-- 
2.27.0