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