New module 'mbsnlen'.

[gnulib.git] / lib / mbsnlen.c

diff --git a/lib/mbsnlen.c b/lib/mbsnlen.c
new file mode 100644 (file)
index 0000000..4cd3358
--- /dev/null
+++ b/lib/mbsnlen.c
@@ -0,0 +1,50 @@
+/* Counting the multibyte characters in a string.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2007.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU 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 General Public License for more details.
+
+   You should have received a copy of the GNU 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.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <string.h>
+
+#include <stdlib.h>
+
+#if HAVE_MBRTOWC
+# include "mbiter.h"
+#endif
+
+/* Return the number of multibyte characters in the character string starting
+   at STRING and ending at STRING + LEN.  */
+size_t
+mbsnlen (const char *string, size_t len)
+{
+#if HAVE_MBRTOWC
+  if (MB_CUR_MAX > 1)
+    {
+      size_t count;
+      mbi_iterator_t iter;
+
+      count = 0;
+      for (mbi_init (iter, string, len); mbi_avail (iter); mbi_advance (iter))
+       count++;
+
+      return count;
+    }
+  else
+#endif
+    return len;
+}