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FreeBSD/Linux Kernel Cross Reference
sys/locale/mbtowc.c

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    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: stable/6/lib/libc/locale/mbtowc.c 132821 2004-07-29 06:18:40Z tjr $");
   29 
   30 #include <stdlib.h>
   31 #include <wchar.h>
   32 #include "mblocal.h"
   33 
   34 int
   35 mbtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n)
   36 {
   37         static const mbstate_t initial;
   38         static mbstate_t mbs;
   39         size_t rval;
   40 
   41         if (s == NULL) {
   42                 /* No support for state dependent encodings. */
   43                 mbs = initial;
   44                 return (0);
   45         }
   46         rval = __mbrtowc(pwc, s, n, &mbs);
   47         if (rval == (size_t)-1 || rval == (size_t)-2)
   48                 return (-1);
   49         return ((int)rval);
   50 }

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