minix/lib/libc/stdio/fgetwc.c

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/* $NetBSD: fgetwc.c,v 1.13 2012/03/15 18:22:30 christos 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 <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: fgetwc.c,v 1.13 2012/03/15 18:22:30 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <wchar.h>
#include "reentrant.h"
#include "local.h"
wint_t
__fgetwc_unlock(FILE *fp)
{
struct wchar_io_data *wcio;
wchar_t wc;
size_t nr;
_DIAGASSERT(fp != NULL);
_SET_ORIENTATION(fp, 1);
wcio = WCIO_GET(fp);
_DIAGASSERT(wcio != NULL);
/* if there're ungetwc'ed wchars, use them */
if (wcio->wcio_ungetwc_inbuf)
return wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
if (fp->_r <= 0) {
restart:
if (__srefill(fp) != 0)
return WEOF;
}
nr = mbrtowc(&wc, (const char *)fp->_p,
(size_t)fp->_r, &wcio->wcio_mbstate_in);
if (nr == (size_t)-1) {
fp->_flags |= __SERR;
return WEOF;
} else if (nr == (size_t)-2) {
fp->_p += fp->_r;
fp->_r = 0;
goto restart;
}
if (wc == L'\0') {
while (*fp->_p != '\0') {
++fp->_p;
--fp->_r;
}
nr = 1;
}
fp->_p += nr;
_DIAGASSERT(__type_fit(int, fp->_r - nr));
fp->_r -= (int)nr;
return wc;
}
wint_t
fgetwc(FILE *fp)
{
wint_t r;
_DIAGASSERT(fp != NULL);
FLOCKFILE(fp);
r = __fgetwc_unlock(fp);
FUNLOCKFILE(fp);
return r;
}