1 files changed, 49 insertions, 0 deletions
diff --git a/usr.bin/xlint/lint1/msg_374.c b/usr.bin/xlint/lint1/msg_374.c
new file mode 100644
index 000000000000..1d4312623e58
--- /dev/null
+++ b/usr.bin/xlint/lint1/msg_374.c
@@ -0,0 +1,49 @@
+/*	$NetBSD: msg_374.c,v 1.6 2024/08/31 06:57:31 rillig Exp $	*/
+# 3 "msg_374.c"
+
+// Test for message: unknown conversion '%.*s', must be one of 'bfF=:*' [374]
+
+/*
+ * In the new-style format, an unknown conversion is assumed to have a single
+ * argument, followed by a null-terminated description.
+ */
+
+/* lint1-extra-flags: -X 351 */
+
+typedef typeof(sizeof(0)) size_t;
+typedef unsigned long long uint64_t;
+
+int snprintb(char *, size_t, const char *, uint64_t);
+
+void
+example(uint64_t u64)
+{
+	char buf[64];
+
+	/* expect+4: warning: unknown conversion 'x', must be one of 'bfF=:*' [374] */
+	snprintb(buf, sizeof(buf),
+	    "\177\020"
+	    "x12345\0",
+	    u64);
+
+	/* expect+4: warning: unknown conversion '\000', must be one of 'bfF=:*' [374] */
+	snprintb(buf, sizeof(buf),
+	    "\177\020"
+	    "\00012345\0",
+	    u64);
+
+	/* expect+5: warning: redundant '\0' at the end of the format [377] */
+	snprintb(buf, sizeof(buf),
+	    "\177\020"
+	    "b\00012345\0"
+	    "\0",
+	    u64);
+
+	// Real-life example: the '\b' is a typo.
+	//
+	/* expect+4: warning: unknown conversion '\b', must be one of 'bfF=:*' [374] */
+	snprintb(buf, sizeof(buf),
+	    "\177\020"
+	    "b\15ENCNT\0b\16" "TC\0\b\20DSBL_CSR_DRN\0",
+	    u64);
+}