libc/upstream-openbsd/lib/libc/stdio/vswscanf.c

/* $OpenBSD: vswscanf.c,v 1.2 2012/12/05 23:20:01 deraadt Exp $ */

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Donn Seeley at UUNET Technologies, Inc.
 *
 * 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "local.h"

static int	eofread(void *, char *, int);

static int
eofread(void *cookie, char *buf, int len)
{
	return (0);
}

int
vswscanf(const wchar_t * __restrict str, const wchar_t * __restrict fmt,
    __va_list ap)
{
	mbstate_t mbs;
	FILE f;
	struct __sfileext fext;
	char *mbstr;
	size_t len, mlen;
	int r;
	const wchar_t *strp;

	/*
	 * XXX Convert the wide character string to multibyte, which
	 * __vfwscanf() will convert back to wide characters.
	 */
	len = wcslen(str) * MB_CUR_MAX;
	if ((mbstr = malloc(len + 1)) == NULL)
		return (EOF);
	bzero(&mbs, sizeof(mbs));
	strp = str;
	if ((mlen = wcsrtombs(mbstr, &strp, len, &mbs)) == (size_t)-1) {
		free(mbstr);
		return (EOF);
	}
	if (mlen == len)
		mbstr[len] = '\0';
	_FILEEXT_SETUP(&f, &fext);
	f._flags = __SRD;
	f._bf._base = f._p = (unsigned char *)mbstr;
	f._bf._size = f._r = mlen;
	f._read = eofread;
	f._lb._base = NULL;
	r = __vfwscanf(&f, fmt, ap);
	free(mbstr);

	return (r);
}