compiler/clib/locale/wcsnrtombs.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/wcsnrtombs.c,v 1.3 2005/02/12 08:45:12 stefanf Exp $");
  29
  30 #include <limits.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <wchar.h>
  34 #include "mblocal.h"
  35
  36 size_t
  37 wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
  38     size_t len, mbstate_t * __restrict ps)
  39 {
  40         static mbstate_t mbs;
  41
  42         if (ps == NULL)
  43                 ps = &mbs;
  44         return (__wcsnrtombs(dst, src, nwc, len, ps));
  45 }
  46
  47 size_t
  48 __wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src,
  49     size_t nwc, size_t len, mbstate_t * __restrict ps)
  50 {
  51         mbstate_t mbsbak;
  52         char buf[MB_LEN_MAX];
  53         const wchar_t *s;
  54         size_t nbytes;
  55         size_t nb;
  56
  57         s = *src;
  58         nbytes = 0;
  59
  60         if (dst == NULL) {
  61                 while (nwc-- > 0) {
  62                         if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1)
  63                                 /* Invalid character - wcrtomb() sets errno. */
  64                                 return ((size_t)-1);
  65                         else if (*s == L'\0')
  66                                 return (nbytes + nb - 1);
  67                         s++;
  68                         nbytes += nb;
  69                 }
  70                 return (nbytes);
  71         }
  72
  73         while (len > 0 && nwc-- > 0) {
  74                 if (len > (size_t)MB_CUR_MAX) {
  75                         /* Enough space to translate in-place. */
  76                         if ((nb = __wcrtomb(dst, *s, ps)) == (size_t)-1) {
  77                                 *src = s;
  78                                 return ((size_t)-1);
  79                         }
  80                 } else {
  81                         /*
  82                          * May not be enough space; use temp. buffer.
  83                          *
  84                          * We need to save a copy of the conversion state
  85                          * here so we can restore it if the multibyte
  86                          * character is too long for the buffer.
  87                          */
  88                         mbsbak = *ps;
  89                         if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1) {
  90                                 *src = s;
  91                                 return ((size_t)-1);
  92                         }
  93                         if (nb > (int)len) {
  94                                 /* MB sequence for character won't fit. */
  95                                 *ps = mbsbak;
  96                                 break;
  97                         }
  98                         memcpy(dst, buf, nb);
  99                 }
 100                 if (*s == L'\0') {
 101                         *src = NULL;
 102                         return (nbytes + nb - 1);
 103                 }
 104                 s++;
 105                 dst += nb;
 106                 len -= nb;
 107                 nbytes += nb;
 108         }
 109         *src = s;
 110         return (nbytes);
 111 }