locale/FreeBSD/mblen.c

   1 /*-
   2  * Copyright (c) 2002-2004 Tim J. Robbins.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/locale/mblen.c,v 1.9 2004/07/29 06:18:40 tjr Exp $");
  29
  30 #include "xlocale_private.h"
  31
  32 #include <stdlib.h>
  33 #include <wchar.h>
  34 #include "mblocal.h"
  35
  36 int
  37 mblen_l(const char *s, size_t n, locale_t loc)
  38 {
  39         static const mbstate_t initial;
  40         size_t rval;
  41
  42         NORMALIZE_LOCALE(loc);
  43         if (s == NULL) {
  44                 /* No support for state dependent encodings. */
  45                 loc->__mbs_mblen = initial;
  46                 return (0);
  47         }
  48         rval = loc->__lc_ctype->__mbrtowc(NULL, s, n, &loc->__mbs_mblen, loc);
  49         if (rval == (size_t)-1 || rval == (size_t)-2)
  50                 return (-1);
  51         return ((int)rval);
  52 }
  53
  54 int
  55 mblen(const char *s, size_t n)
  56 {
  57         return mblen_l(s, n, __current_locale());
  58 }