From: Karel Zak <kzak@redhat.com>
Date: Wed, 22 Apr 2026 10:21:50 +0000 (+0200)
Subject: agetty: add cred_read_num() for credential numeric parsing
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=82de7e2e30c7d8bc381ef8685414012d04deb18a;p=thirdparty%2Futil-linux.git

agetty: add cred_read_num() for credential numeric parsing

Introduce cred_read_num() helper that reads a systemd credential
file and parses the value as a number. The type argument selects
between unsigned ('u') and signed ('d') parsing, making it easy
to extend for other numeric types in the future.

Addresses: https://github.com/util-linux/util-linux/issues/2255
Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/term-utils/agetty.c b/term-utils/agetty.c
index de5215d48..959386706 100644
--- a/term-utils/agetty.c
+++ b/term-utils/agetty.c
@@ -3108,6 +3108,43 @@ static int cred_read_str(struct path_cxt *pc, const char *name,
 	return 0;
 }
 
+static int cred_read_num(struct path_cxt *pc, const char *name,
+			 struct options *op, size_t offset, int type)
+{
+	char *str = NULL;
+	int rc;
+
+	if (ul_path_read_string(pc, &str, name) < 0)
+		return -1;
+
+	switch (type) {
+	case 'u':
+	{
+		uint32_t num;
+		rc = ul_strtou32(str, &num, 10);
+		if (rc == 0)
+			*((unsigned int *) ((char *) op + offset)) = num;
+		break;
+	}
+	case 'd':
+	{
+		int32_t num;
+		rc = ul_strtos32(str, &num, 10);
+		if (rc == 0)
+			*((int *) ((char *) op + offset)) = num;
+		break;
+	}
+	default:
+		rc = -EINVAL;
+		break;
+	}
+
+	if (rc)
+		log_warn(_("invalid '%s' credential value"), name);
+	free(str);
+	return rc;
+}
+
 static void load_credentials(struct options *op)
 {
 	char *env;