1 files changed, 24 insertions, 0 deletions
diff --git a/src/compat/strndup.c b/src/compat/strndup.c
new file mode 100644
index 0000000..1db7069
--- /dev/null
+++ b/src/compat/strndup.c
@@ -0,0 +1,24 @@
+/* -*- mode: c; c-file-style: "openbsd" -*- */
+
+#include <stdlib.h>
+#include <string.h>
+#include "compat.h"
+
+/*
+ * Similar to `strdup()` but copies at most n bytes.
+ */
+char *
+strndup(const char *string, size_t maxlen)
+{
+	char *result;
+	/* We may use `strnlen()` but it may be unavailable. */
+	const char *end = memchr(string, '\0', maxlen);
+	size_t len = end ? (size_t)(end - string) : maxlen;
+
+	result = malloc(len + 1);
+	if (!result) return 0;
+
+	memcpy(result, string, len);
+	result[len] = '\0';
+	return result;
+}