compiler/clib/locale/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 <errno.h>
  31 #include <limits.h>
  32 #include <stdlib.h>
  33 #include <wchar.h>
  34 #include "mblocal.h"
  35
  36 size_t
  37 mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
  38     size_t nms, size_t len, mbstate_t * __restrict ps)
  39 {
  40         static mbstate_t mbs;
  41
  42         if (ps == NULL)
  43                 ps = &mbs;
  44         return (__mbsnrtowcs(dst, src, nms, len, ps));
  45 }
  46
  47 size_t
  48 __mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
  49     size_t nms, size_t len, mbstate_t * __restrict ps)
  50 {
  51         const char *s;
  52         size_t nchr;
  53         wchar_t wc;
  54         size_t nb;
  55
  56         s = *src;
  57         nchr = 0;
  58
  59         if (dst == NULL) {
  60                 for (;;) {
  61                         if ((nb = __mbrtowc(&wc, s, nms, ps)) == (size_t)-1)
  62                                 /* Invalid sequence - mbrtowc() sets errno. */
  63                                 return ((size_t)-1);
  64                         else if (nb == 0 || nb == (size_t)-2)
  65                                 return (nchr);
  66                         s += nb;
  67                         nms -= nb;
  68                         nchr++;
  69                 }
  70                 /*NOTREACHED*/
  71         }
  72
  73         while (len-- > 0) {
  74                 if ((nb = __mbrtowc(dst, s, nms, ps)) == (size_t)-1) {
  75                         *src = s;
  76                         return ((size_t)-1);
  77                 } else if (nb == (size_t)-2) {
  78                         *src = s + nms;
  79                         return (nchr);
  80                 } else if (nb == 0) {
  81                         *src = NULL;
  82                         return (nchr);
  83                 }
  84                 s += nb;
  85                 nms -= nb;
  86                 nchr++;
  87                 dst++;
  88         }
  89         *src = s;
  90         return (nchr);
  91 }