1 files changed, 15 insertions, 0 deletions
diff --git a/src/compat/strnlen.c b/src/compat/strnlen.c
new file mode 100644
index 0000000..07db4a4
--- /dev/null
+++ b/src/compat/strnlen.c
@@ -0,0 +1,15 @@
+/* -*- mode: c; c-file-style: "openbsd" -*- */
+
+#include <string.h>
+#include "compat.h"
+
+/*
+ * Determine the length of a fixed-size string. This is really a
+ * wrapper around `memchr()`.
+ */
+size_t
+strnlen(const char *string, size_t maxlen)
+{
+	const char *end = memchr(string, '\0', maxlen);
+	return end ? (size_t)(end - string) : maxlen;
+}