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      1 /*	$NetBSD: vswscanf.c,v 1.12 2013/05/17 12:55:57 joerg 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char sccsid[] = "@(#)vsscanf.c	8.1 (Berkeley) 6/4/93";
     43 __FBSDID("$FreeBSD: src/lib/libc/stdio/vswscanf.c,v 1.3 2004/04/07 09:55:05 tjr Exp $");
     44 #else
     45 __RCSID("$NetBSD: vswscanf.c,v 1.12 2013/05/17 12:55:57 joerg Exp $");
     46 #endif
     47 #endif /* LIBC_SCCS and not lint */
     48 
     49 #include "namespace.h"
     50 
     51 #include <assert.h>
     52 #include <limits.h>
     53 #include <locale.h>
     54 #include <stdarg.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <wchar.h>
     59 #include "reentrant.h"
     60 #include "setlocale_local.h"
     61 #include "local.h"
     62 
     63 __weak_alias(vswscanf_l, _vswscanf_l)
     64 
     65 static ssize_t
     66 /*ARGSUSED*/
     67 eofread(void *cookie, void *buf, size_t len)
     68 {
     69 
     70 	return 0;
     71 }
     72 
     73 int
     74 vswscanf_l(const wchar_t * __restrict str, locale_t loc,
     75     const wchar_t * __restrict fmt, va_list ap)
     76 {
     77 	static const mbstate_t initial;
     78 	mbstate_t mbs;
     79 	FILE f;
     80 	char *mbstr;
     81 	size_t mlen;
     82 	int r;
     83 	const wchar_t *rstr = str;
     84 	struct __sfileext fext;
     85 
     86 	/*
     87 	 * XXX Convert the wide character string to multibyte, which
     88 	 * __vfwscanf() will convert back to wide characters.
     89 	 */
     90 	mbstr = malloc(wcslen(str) * MB_CUR_MAX_L(loc) + 1);
     91 	if (mbstr == NULL)
     92 		return EOF;
     93 	mbs = initial;
     94 	if ((mlen = wcsrtombs_l(mbstr, &rstr, SIZE_T_MAX, &mbs, loc))
     95 	    == (size_t)-1) {
     96 		free(mbstr);
     97 		return EOF;
     98 	}
     99 	_FILEEXT_SETUP(&f, &fext);
    100 	(void)memset(WCIO_GET(&f), 0, sizeof(struct wchar_io_data));
    101 	f._file = -1;
    102 	f._flags = __SRD;
    103 	f._bf._base = f._p = (unsigned char *)mbstr;
    104 	_DIAGASSERT(__type_fit(int, mlen));
    105 	f._bf._size = f._r = (int)mlen;
    106 	f._read = eofread;
    107 	_UB(&f)._base = NULL;
    108 	r = __vfwscanf_unlocked_l(&f, loc, fmt, ap);
    109 	free(mbstr);
    110 
    111 	return r;
    112 }
    113 
    114 int
    115 vswscanf(const wchar_t * __restrict str, const wchar_t * __restrict fmt,
    116     va_list ap)
    117 {
    118 	return vswscanf_l(str, _current_locale(), fmt, ap);
    119 }
    120