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/*-
* Copyright (c) 2002 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"
static __inline wint_t __fgetwc_nbf(FILE *);
/*
* Non-MT-safe version.
*/
wint_t
__fgetwc(FILE *fp)
{
wint_t wc;
if (MB_CUR_MAX == 1) {
/*
* Assume we're using a single-byte locale. A safer test
* might be to check _CurrentRuneLocale->encoding.
*/
wc = (wint_t)__sgetc(fp);
} else
wc = __fgetwc_nbf(fp);
return (wc);
}
/*
* MT-safe version.
*/
wint_t
fgetwc(FILE *fp)
{
wint_t r;
FLOCKFILE(fp);
ORIENT(fp, 1);
r = __fgetwc(fp);
FUNLOCKFILE(fp);
return (r);
}
static __inline wint_t
__fgetwc_nbf(FILE *fp)
{
char buf[MB_LEN_MAX];
mbstate_t mbs;
size_t n, nconv;
int c;
wchar_t wc;
n = 0;
while (n < MB_CUR_MAX) {
if ((c = __sgetc(fp)) == EOF) {
if (n == 0)
return (WEOF);
break;
}
buf[n++] = (char)c;
memset(&mbs, 0, sizeof(mbs));
nconv = mbrtowc(&wc, buf, n, &mbs);
if (nconv == n)
return (wc);
else if (nconv == 0)
return (L'\0');
else if (nconv == (size_t)-1)
break;
}
while (n-- != 0)
__ungetc((unsigned char)buf[n], fp);
errno = EILSEQ;
fp->_flags |= __SERR;
return (WEOF);
}
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