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 <limits.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <wchar.h>
  33 #include "mblocal.h"
  34 
  35 size_t
  36 wcsnrtombs(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
  37     size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps)
  38 {
  39         static mbstate_t mbs;
  40 
  41         if (ps == NULL)
  42                 ps = &mbs;
  43         return (__wcsnrtombs(dst, src, nwc, len, ps));
  44 }
  45 
  46 size_t
  47 __wcsnrtombs_std(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
  48     size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps)
  49 {
  50         mbstate_t mbsbak;
  51         char buf[MB_LEN_MAX];
  52         const wchar_t *s;
  53         size_t nbytes;
  54         size_t nb;
  55 
  56         s = *src;
  57         nbytes = 0;
  58 
  59         if (dst == NULL) {
  60                 while (nwc-- > 0) {
  61                         if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1)
  62                                 /* Invalid character - wcrtomb() sets errno. */
  63                                 return ((size_t)-1);
  64                         else if (*s == L'\0')
  65                                 return (nbytes + nb - 1);
  66                         s++;
  67                         nbytes += nb;
  68                 }
  69                 return (nbytes);
  70         }
  71 
  72         while (len > 0 && nwc-- > 0) {
  73                 if (len > (size_t)MB_CUR_MAX) {
  74                         /* Enough space to translate in-place. */
  75                         if ((nb = __wcrtomb(dst, *s, ps)) == (size_t)-1) {
  76                                 *src = s;
  77                                 return ((size_t)-1);
  78                         }
  79                 } else {
  80                         /*
  81                          * May not be enough space; use temp. buffer.
  82                          *
  83                          * We need to save a copy of the conversion state
  84                          * here so we can restore it if the multibyte
  85                          * character is too long for the buffer.
  86                          */
  87                         mbsbak = *ps;
  88                         if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1) {
  89                                 *src = s;
  90                                 return ((size_t)-1);
  91                         }
  92                         if (nb > (int)len) {
  93                                 /* MB sequence for character won't fit. */
  94                                 *ps = mbsbak;
  95                                 break;
  96                         }
  97                         (void) memcpy(dst, buf, nb);
  98                 }
  99                 if (*s == L'\0') {
 100                         *src = NULL;
 101                         return (nbytes + nb - 1);
 102                 }
 103                 s++;
 104                 dst += nb;
 105                 len -= nb;
 106                 nbytes += nb;
 107         }
 108         *src = s;
 109         return (nbytes);
 110 }