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      1 /* $OpenBSD: vswscanf.c,v 1.2 2012/12/05 23:20:01 deraadt Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Donn Seeley at UUNET Technologies, Inc.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 4. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <limits.h>
     36 #include <stdarg.h>
     37 #include <stdio.h>
     38 #include <stdlib.h>
     39 #include <string.h>
     40 #include <wchar.h>
     41 #include "local.h"
     42 
     43 static int	eofread(void *, char *, int);
     44 
     45 static int
     46 eofread(void *cookie, char *buf, int len)
     47 {
     48 	return (0);
     49 }
     50 
     51 int
     52 vswscanf(const wchar_t * __restrict str, const wchar_t * __restrict fmt,
     53     __va_list ap)
     54 {
     55 	mbstate_t mbs;
     56 	FILE f;
     57 	struct __sfileext fext;
     58 	char *mbstr;
     59 	size_t len, mlen;
     60 	int r;
     61 	const wchar_t *strp;
     62 
     63 	/*
     64 	 * XXX Convert the wide character string to multibyte, which
     65 	 * __vfwscanf() will convert back to wide characters.
     66 	 */
     67 	len = wcslen(str) * MB_CUR_MAX;
     68 	if ((mbstr = malloc(len + 1)) == NULL)
     69 		return (EOF);
     70 	bzero(&mbs, sizeof(mbs));
     71 	strp = str;
     72 	if ((mlen = wcsrtombs(mbstr, &strp, len, &mbs)) == (size_t)-1) {
     73 		free(mbstr);
     74 		return (EOF);
     75 	}
     76 	if (mlen == len)
     77 		mbstr[len] = '\0';
     78 	_FILEEXT_SETUP(&f, &fext);
     79 	f._flags = __SRD;
     80 	f._bf._base = f._p = (unsigned char *)mbstr;
     81 	f._bf._size = f._r = mlen;
     82 	f._read = eofread;
     83 	f._lb._base = NULL;
     84 	r = __vfwscanf(&f, fmt, ap);
     85 	free(mbstr);
     86 
     87 	return (r);
     88 }
     89