lib/libc/stdio/vswscanf.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Donn Seeley at UUNET Technologies, Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#)vsscanf.c        8.1 (Berkeley) 6/4/93
  33  * $FreeBSD: src/lib/libc/stdio/vswscanf.c,v 1.6 2009/01/15 18:53:52 rdivacky Exp $
  34  * $DragonFly: src/lib/libc/stdio/vswscanf.c,v 1.3 2006/03/02 18:05:30 joerg Exp $
  35  */
  36
  37 #include <limits.h>
  38 #include <stdarg.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <wchar.h>
  43 #include "local.h"
  44 #include "priv_stdio.h"
  45
  46 static int      eofread(void *, char *, int);
  47
  48 static int
  49 eofread(void *cookie __unused, char *buf __unused, int len __unused)
  50 {
  51
  52         return (0);
  53 }
  54
  55 int
  56 vswscanf(const wchar_t * __restrict str, const wchar_t * __restrict fmt,
  57          va_list ap)
  58 {
  59         static const mbstate_t initial;
  60         mbstate_t mbs;
  61         FILE f;
  62         char *mbstr;
  63         size_t mlen;
  64         int r;
  65         const wchar_t *strp;
  66
  67         /*
  68          * XXX Convert the wide character string to multibyte, which
  69          * __vfwscanf() will convert back to wide characters.
  70          */
  71         if ((mbstr = malloc(wcslen(str) * MB_CUR_MAX + 1)) == NULL)
  72                 return (EOF);
  73         mbs = initial;
  74         strp = str;
  75         if ((mlen = wcsrtombs(mbstr, &strp, SIZE_T_MAX, &mbs)) == (size_t)-1) {
  76                 free(mbstr);
  77                 return (EOF);
  78         }
  79         f.pub._fileno = -1;
  80         f.pub._flags = __SRD;
  81         f._bf._base = f.pub._p = (unsigned char *)mbstr;
  82         f._bf._size = f.pub._r = mlen;
  83         f._read = eofread;
  84         f._ub._base = NULL;
  85         f._lb._base = NULL;
  86         memset(WCIO_GET(&f), 0, sizeof(struct wchar_io_data));
  87         r = __vfwscanf(&f, fmt, ap);
  88         free(mbstr);
  89
  90         return (r);
  91 }