locale/FreeBSD/mbsnrtowcs.c

   1 /*-
   2  * Copyright (c) 2002-2004 Tim J. Robbins.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/locale/mbsnrtowcs.c,v 1.1 2004/07/21 10:54:57 tjr Exp $");
  29
  30 #include "xlocale_private.h"
  31
  32 #include <errno.h>
  33 #include <limits.h>
  34 #include <stdlib.h>
  35 #include <wchar.h>
  36 #include "mblocal.h"
  37
  38 size_t
  39 mbsnrtowcs_l(wchar_t * __restrict dst, const char ** __restrict src,
  40     size_t nms, size_t len, mbstate_t * __restrict ps, locale_t loc)
  41 {
  42         NORMALIZE_LOCALE(loc);
  43         if (ps == NULL)
  44                 ps = &loc->__mbs_mbsnrtowcs;
  45         return (loc->__lc_ctype->__mbsnrtowcs(dst, src, nms, len, ps, loc));
  46 }
  47
  48 size_t
  49 mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
  50     size_t nms, size_t len, mbstate_t * __restrict ps)
  51 {
  52         return mbsnrtowcs_l(dst, src, nms, len, ps, __current_locale());
  53 }
  54
  55 __private_extern__ size_t
  56 __mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
  57     size_t nms, size_t len, mbstate_t * __restrict ps, locale_t loc)
  58 {
  59         const char *s;
  60         size_t nchr;
  61         wchar_t wc;
  62         size_t nb;
  63         size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
  64             size_t, mbstate_t * __restrict, locale_t)
  65             = loc->__lc_ctype->__mbrtowc;
  66
  67         s = *src;
  68         nchr = 0;
  69
  70         if (dst == NULL) {
  71                 for (;;) {
  72                         if ((nb = __mbrtowc(&wc, s, nms, ps, loc)) == (size_t)-1)
  73                                 /* Invalid sequence - mbrtowc() sets errno. */
  74                                 return ((size_t)-1);
  75                         else if (nb == 0 || nb == (size_t)-2)
  76                                 return (nchr);
  77                         s += nb;
  78                         nms -= nb;
  79                         nchr++;
  80                 }
  81                 /*NOTREACHED*/
  82         }
  83
  84         while (len-- > 0) {
  85                 if ((nb = __mbrtowc(dst, s, nms, ps, loc)) == (size_t)-1) {
  86                         *src = s;
  87                         return ((size_t)-1);
  88                 } else if (nb == (size_t)-2) {
  89                         *src = s + nms;
  90                         return (nchr);
  91                 } else if (nb == 0) {
  92                         *src = NULL;
  93                         return (nchr);
  94                 }
  95                 s += nb;
  96                 nms -= nb;
  97                 nchr++;
  98                 dst++;
  99         }
 100         *src = s;
 101         return (nchr);
 102 }