79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
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/* $NetBSD: ungetwc.c,v 1.3 2005/06/12 05:21:27 lukem 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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: ungetwc.c,v 1.3 2005/06/12 05:21:27 lukem Exp $");
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#endif /* LIBC_SCCS and not lint */
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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 "reentrant.h"
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#include "local.h"
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wint_t
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ungetwc(wint_t wc, FILE *fp)
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{
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struct wchar_io_data *wcio;
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_DIAGASSERT(fp);
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if (wc == WEOF)
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return WEOF;
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FLOCKFILE(fp);
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_SET_ORIENTATION(fp, 1);
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/*
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* XXX since we have no way to transform a wchar string to
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* a char string in reverse order, we can't use ungetc.
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*/
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/* XXX should we flush ungetc buffer? */
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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; /* XXX */
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return WEOF;
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}
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if (wcio->wcio_ungetwc_inbuf >= WCIO_UNGETWC_BUFSIZE) {
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FUNLOCKFILE(fp);
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return WEOF;
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}
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wcio->wcio_ungetwc_buf[wcio->wcio_ungetwc_inbuf++] = wc;
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__sclearerr(fp);
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FUNLOCKFILE(fp);
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return wc;
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}
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