lib/libc/locale/mbsnrtowcs.c

   1 /*
   2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
   3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   4  * Copyright (c) 2002-2004 Tim J. Robbins.
   5  *
   6  * Copyright (c) 2011 The FreeBSD Foundation
   7  * All rights reserved.
   8  * Portions of this software were developed by David Chisnall
   9  * under sponsorship from the FreeBSD Foundation.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <errno.h>
  35 #include <limits.h>
  36 #include <stdlib.h>
  37 #include <wchar.h>
  38 #include "mblocal.h"
  39
  40 size_t
  41 mbsnrtowcs_l(wchar_t * __restrict dst, const char ** __restrict src,
  42     size_t nms, size_t len, mbstate_t * __restrict ps, locale_t locale)
  43 {
  44         FIX_LOCALE(locale);
  45         if (ps == NULL)
  46                 ps = &locale->mbsnrtowcs;
  47         return (XLOCALE_CTYPE(locale)->__mbsnrtowcs(dst, src, nms, len, ps));
  48 }
  49 size_t
  50 mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
  51     size_t nms, size_t len, mbstate_t * __restrict ps)
  52 {
  53         return mbsnrtowcs_l(dst, src, nms, len, ps, __get_locale());
  54 }
  55
  56 size_t
  57 __mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
  58     size_t nms, size_t len, mbstate_t * __restrict ps,
  59     mbrtowc_pfn_t pmbrtowc)
  60 {
  61         const char *s;
  62         size_t nchr;
  63         wchar_t wc;
  64         size_t nb;
  65
  66         s = *src;
  67         nchr = 0;
  68
  69         if (dst == NULL) {
  70                 for (;;) {
  71                         if ((nb = pmbrtowc(&wc, s, nms, ps)) == (size_t)-1)
  72                                 /* Invalid sequence - mbrtowc() sets errno. */
  73                                 return ((size_t)-1);
  74                         else if (nb == 0 || nb == (size_t)-2)
  75                                 return (nchr);
  76                         s += nb;
  77                         nms -= nb;
  78                         nchr++;
  79                 }
  80                 /*NOTREACHED*/
  81         }
  82
  83         while (len-- > 0) {
  84                 if ((nb = pmbrtowc(dst, s, nms, ps)) == (size_t)-1) {
  85                         *src = s;
  86                         return ((size_t)-1);
  87                 } else if (nb == (size_t)-2) {
  88                         *src = s + nms;
  89                         return (nchr);
  90                 } else if (nb == 0) {
  91                         *src = NULL;
  92                         return (nchr);
  93                 }
  94                 s += nb;
  95                 nms -= nb;
  96                 nchr++;
  97                 dst++;
  98         }
  99         *src = s;
 100         return (nchr);
 101 }