82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
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/*-
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* Copyright (c) 2002 Tim J. Robbins.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <rune.h>
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#include <stdlib.h>
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#include <wchar.h>
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size_t
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mbrtowc(wchar_t *__restrict pwc, const char *__restrict s, size_t n,
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mbstate_t *__restrict ps __unused)
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{
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const char *e;
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rune_t r;
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if (s == NULL) {
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pwc = NULL;
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s = "";
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n = 1;
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}
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if (*s == '\0') {
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if (pwc != NULL)
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*pwc = L'\0';
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return (0);
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}
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if ((r = sgetrune(s, n, &e)) == _INVALID_RUNE) {
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/*
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* The design of sgetrune() doesn't give us any way to tell
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* between incomplete and invalid multibyte sequences.
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*/
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if (n >= (size_t)MB_CUR_MAX) {
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/*
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* If we have been supplied with at least MB_CUR_MAX
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* bytes and still cannot find a valid character, the
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* data must be invalid.
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*/
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errno = EILSEQ;
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return ((size_t)-1);
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}
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/*
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* .. otherwise, it's an incomplete character or an invalid
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* character we cannot detect yet.
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*/
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return ((size_t)-2);
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}
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if (pwc != NULL)
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*pwc = (wchar_t)r;
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return ((size_t)(e - s));
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}
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