lib/libc/locale/btowc.c

   1 /*-
   2  * Copyright (c) 2002, 2003 Tim J. Robbins.
   3  * All rights reserved.
   4  *
   5  * Copyright (c) 2011 The FreeBSD Foundation
   6  * All rights reserved.
   7  * Portions of this software were developed by David Chisnall
   8  * under sponsorship from the FreeBSD Foundation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * $FreeBSD: head/lib/libc/locale/btowc.c 227753 2011-11-20 14:45:42Z theraven $
  32  */
  33
  34
  35 #include <stdio.h>
  36 #include <wchar.h>
  37 #include "mblocal.h"
  38
  39 wint_t
  40 btowc_l(int c, locale_t l)
  41 {
  42         static const mbstate_t initial;
  43         mbstate_t mbs = initial;
  44         char cc;
  45         wchar_t wc;
  46         FIX_LOCALE(l);
  47
  48         if (c == EOF)
  49                 return (WEOF);
  50         /*
  51          * We expect mbrtowc() to return 0 or 1, hence the check for n > 1
  52          * which detects error return values as well as "impossible" byte
  53          * counts.
  54          */
  55         cc = (char)c;
  56         if (XLOCALE_CTYPE(l)->__mbrtowc(&wc, &cc, 1, &mbs) > 1)
  57                 return (WEOF);
  58         return (wc);
  59 }
  60 wint_t
  61 btowc(int c)
  62 {
  63         return btowc_l(c, __get_locale());
  64 }