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/* $OpenBSD: fgetwc.c,v 1.6 2015/12/24 19:55:39 schwarze Exp $ */
/* $NetBSD: fgetwc.c,v 1.3 2003/03/07 07:11:36 tshiozak Exp $ */
/*-
* Copyright (c)2001 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Citrus$
*/
#include <errno.h>
#include <stdio.h>
#include <wchar.h>
#include "local.h"
wint_t
__fgetwc_unlock(FILE *fp)
{
struct wchar_io_data *wcio;
mbstate_t *st;
wchar_t wc;
size_t size;
_SET_ORIENTATION(fp, 1);
wcio = WCIO_GET(fp);
if (wcio == 0) {
errno = ENOMEM;
return WEOF;
}
/* if there're ungetwc'ed wchars, use them */
if (wcio->wcio_ungetwc_inbuf) {
wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
return wc;
}
st = &wcio->wcio_mbstate_in;
do {
char c;
int ch = __sgetc(fp);
if (ch == EOF) {
return WEOF;
}
c = ch;
size = mbrtowc(&wc, &c, 1, st);
if (size == (size_t)-1) {
fp->_flags |= __SERR;
return WEOF;
}
} while (size == (size_t)-2);
return wc;
}
wint_t
fgetwc(FILE *fp)
{
wint_t r;
FLOCKFILE(fp);
r = __fgetwc_unlock(fp);
FUNLOCKFILE(fp);
return (r);
}
DEF_STRONG(fgetwc);
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