New module 'strnlen1'.

[gnulib.git] / lib / strnlen1.c

diff --git a/lib/strnlen1.c b/lib/strnlen1.c
new file mode 100644 (file)
index 0000000..6cc2da8
--- /dev/null
+++ b/lib/strnlen1.c
@@ -0,0 +1,39 @@
+/* Find the length of STRING + 1, but scan at most MAXLEN bytes.
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library General Public License as published
+   by the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Specification.  */
+#include "strnlen1.h"
+
+#include <string.h>
+
+/* Find the length of STRING + 1, but scan at most MAXLEN bytes.
+   If no '\0' terminator is found in that many characters, return MAXLEN.  */
+/* This is the same as strnlen (string, maxlen - 1) + 1.  */
+size_t
+strnlen1 (const char *string, size_t maxlen)
+{
+  const char *end = memchr (string, '\0', maxlen);
+  if (end != NULL)
+    return end - string + 1;
+  else
+    return maxlen;
+}