usr/src/lib/libc/port/locale/wcsnrtombs.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  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include "lint.h"
  30 #include <limits.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <locale.h>
  34 #include <wchar.h>
  35 #include "mblocal.h"
  36 #include "localeimpl.h"
  37 #include "lctype.h"
  38
  39 size_t
  40 wcsnrtombs_l(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
  41     size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps, locale_t loc)
  42 {
  43         static mbstate_t mbs;
  44
  45         if (ps == NULL)
  46                 ps = &mbs;
  47         return (loc->ctype->lc_wcsnrtombs(dst, src, nwc, len, ps));
  48 }
  49
  50 size_t
  51 wcsnrtombs(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
  52     size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps)
  53 {
  54         return (wcsnrtombs_l(dst, src, nwc, len, ps, uselocale(NULL)));
  55 }
  56
  57 size_t
  58 __wcsnrtombs_std(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
  59     size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps,
  60     wcrtomb_pfn_t pwcrtomb)
  61 {
  62         mbstate_t mbsbak;
  63         char buf[MB_LEN_MAX];
  64         const wchar_t *s;
  65         size_t nbytes;
  66         size_t nb;
  67
  68         s = *src;
  69         nbytes = 0;
  70
  71         if (dst == NULL) {
  72                 while (nwc-- > 0) {
  73                         if ((nb = pwcrtomb(buf, *s, ps)) == (size_t)-1)
  74                                 /* Invalid character - wcrtomb() sets errno. */
  75                                 return ((size_t)-1);
  76                         else if (*s == L'\0')
  77                                 return (nbytes + nb - 1);
  78                         s++;
  79                         nbytes += nb;
  80                 }
  81                 return (nbytes);
  82         }
  83
  84         while (len > 0 && nwc-- > 0) {
  85                 if (len > (size_t)MB_CUR_MAX) {
  86                         /* Enough space to translate in-place. */
  87                         if ((nb = pwcrtomb(dst, *s, ps)) == (size_t)-1) {
  88                                 *src = s;
  89                                 return ((size_t)-1);
  90                         }
  91                 } else {
  92                         /*
  93                          * May not be enough space; use temp. buffer.
  94                          *
  95                          * We need to save a copy of the conversion state
  96                          * here so we can restore it if the multibyte
  97                          * character is too long for the buffer.
  98                          */
  99                         mbsbak = *ps;
 100                         if ((nb = pwcrtomb(buf, *s, ps)) == (size_t)-1) {
 101                                 *src = s;
 102                                 return ((size_t)-1);
 103                         }
 104                         if (nb > (int)len) {
 105                                 /* MB sequence for character won't fit. */
 106                                 *ps = mbsbak;
 107                                 break;
 108                         }
 109                         (void) memcpy(dst, buf, nb);
 110                 }
 111                 if (*s == L'\0') {
 112                         *src = NULL;
 113                         return (nbytes + nb - 1);
 114                 }
 115                 s++;
 116                 dst += nb;
 117                 len -= nb;
 118                 nbytes += nb;
 119         }
 120         *src = s;
 121         return (nbytes);
 122 }