90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
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/* $NetBSD: fgetwc.c,v 1.1 2001/12/07 11:47:41 yamt Exp $ */
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/*-
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* Copyright (c)2001 Citrus Project,
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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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* $Citrus$
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <wchar.h>
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#include "local.h"
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#include "reentrant.h"
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wint_t
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fgetwc(FILE *fp)
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{
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struct wchar_io_data *wcio;
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mbstate_t *st;
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wchar_t wc;
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size_t size;
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_DIAGASSERT(fp != NULL);
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FLOCKFILE(fp);
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_SET_ORIENTATION(fp, 1);
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wcio = WCIO_GET(fp);
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if (wcio == 0) {
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FUNLOCKFILE(fp);
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errno = ENOMEM;
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return WEOF;
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}
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/* if there're ungetwc'ed wchars, use them */
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if (wcio->wcio_ungetwc_inbuf) {
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wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
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FUNLOCKFILE(fp);
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return wc;
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}
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st = &wcio->wcio_mbstate_in;
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do {
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char c;
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int ch = __sgetc(fp);
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if (ch == EOF) {
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FUNLOCKFILE(fp);
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return WEOF;
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}
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c = ch;
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size = mbrtowc(&wc, &c, 1, st);
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if (size == (size_t)-1) {
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FUNLOCKFILE(fp);
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errno = EILSEQ;
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return WEOF;
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}
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} while (size == (size_t)-2);
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FUNLOCKFILE(fp);
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_DIAGASSERT(size == 1);
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return wc;
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}
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