lib/libc/stdio/vswscanf.c

   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 }