locale/FreeBSD/btowc.c

   1 /*-
   2  * Copyright (c) 2002, 2003 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/btowc.c,v 1.4 2004/05/12 14:26:54 tjr Exp $");
  29
  30 #include "xlocale_private.h"
  31
  32 #include <stdio.h>
  33 #include <wchar.h>
  34 #include "mblocal.h"
  35
  36 wint_t
  37 btowc_l(int c, locale_t loc)
  38 {
  39         static const mbstate_t initial;
  40         mbstate_t mbs = initial;
  41         char cc;
  42         wchar_t wc;
  43
  44         NORMALIZE_LOCALE(loc);
  45         if (c == EOF)
  46                 return (WEOF);
  47         /*
  48          * We expect mbrtowc() to return 0 or 1, hence the check for n > 1
  49          * which detects error return values as well as "impossible" byte
  50          * counts.
  51          */
  52         cc = (char)c;
  53         if (loc->__lc_ctype->__mbrtowc(&wc, &cc, 1, &mbs, loc) > 1)
  54                 return (WEOF);
  55         return (wc);
  56 }
  57
  58 wint_t
  59 btowc(int c)
  60 {
  61         return btowc_l(c, __current_locale());
  62 }