freebsd-dev/lib/libc/stdio/fgetwc.c

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/*-
* Copyright (c) 2002-2004 Tim J. Robbins.
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "local.h"
#include "mblocal.h"
/*
* MT-safe version.
*/
wint_t
fgetwc(FILE *fp)
{
wint_t r;
FLOCKFILE(fp);
ORIENT(fp, 1);
r = __fgetwc(fp);
FUNLOCKFILE(fp);
return (r);
}
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/*
* Non-MT-safe version.
*/
wint_t
__fgetwc(FILE *fp)
{
wchar_t wc;
size_t nconv;
if (fp->_r <= 0 && __srefill(fp))
return (WEOF);
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if (MB_CUR_MAX == 1) {
/* Fast path for single-byte encodings. */
wc = *fp->_p++;
fp->_r--;
return (wc);
}
do {
nconv = __mbrtowc(&wc, fp->_p, fp->_r, &fp->_mbstate);
if (nconv == (size_t)-1)
break;
else if (nconv == (size_t)-2)
continue;
else if (nconv == 0) {
/*
* Assume that the only valid representation of
* the null wide character is a single null byte.
*/
fp->_p++;
fp->_r--;
return (L'\0');
} else {
fp->_p += nconv;
fp->_r -= nconv;
return (wc);
}
} while (__srefill(fp) == 0);
fp->_flags |= __SERR;
errno = EILSEQ;
return (WEOF);
}