Add implementation of strnlen for systems without this function

Signed-off-by: Yaakov Selkowitz <yselkowitz@users.sourceforge.net>
Signed-off-by: Jeremy Huddleston <jeremyhu@freedesktop.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/strnlen.c b/strnlen.c
new file mode 100644
index 0000000..725e262
--- /dev/null
+++ b/strnlen.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2009 Apple Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+ /*
+  * Author:  Jeremy Huddleston, Apple Inc.
+  */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <strnlen.h>
+#include <string.h>
+
+size_t strnlen(const char *s, size_t maxlen) {
+    const char *p = memchr(s, 0, maxlen);
+    return (size_t)(p ? (p - s) : maxlen);
+}