xref: /src/lib/libc/stdio/fputwc.c

/* $NetBSD: fputwc.c,v 1.5 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: fputwc.c,v 1.5 2012/03/15 18:22:30 christos Exp $");
#endif /* LIBC_SCCS and not lint */

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <wchar.h>
#include "reentrant.h"
#include "local.h"
#include "fvwrite.h"

wint_t
__fputwc_unlock(wchar_t wc, FILE *fp)
{
	struct wchar_io_data *wcio;
	mbstate_t *st;
	size_t size;
	char buf[MB_LEN_MAX];
	struct __suio uio;
	struct __siov iov;

	_DIAGASSERT(fp != NULL);

	/* LINTED we don't play with buf */
	iov.iov_base = (void *)buf;
	uio.uio_iov = &iov;
	uio.uio_iovcnt = 1;

	_SET_ORIENTATION(fp, 1);
	wcio = WCIO_GET(fp);
	if (wcio == 0) {
		errno = ENOMEM;
		return WEOF;
	}

	wcio->wcio_ungetwc_inbuf = 0;
	st = &wcio->wcio_mbstate_out;

	size = wcrtomb(buf, wc, st);
	if (size == (size_t)-1) {
		errno = EILSEQ;
		return WEOF;
	}

	_DIAGASSERT(size != 0);

	uio.uio_resid = iov.iov_len = size;
	if (__sfvwrite(fp, &uio)) {
		return WEOF;
	}

	return (wint_t)wc;
}

wint_t
fputwc(wchar_t wc, FILE *fp)
{
	wint_t r;

	_DIAGASSERT(fp != NULL);

	FLOCKFILE(fp);
	r = __fputwc_unlock(wc, fp);
	FUNLOCKFILE(fp);

	return r;
}