locale/FreeBSD/wcsrtombs.c

   1 /*-
   2  * Copyright (c) 2002 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/wcsrtombs.c,v 1.2 2002/09/06 11:23:45 tjr Exp $");
  29
  30 #include <errno.h>
  31 #include <limits.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <wchar.h>
  35
  36 size_t
  37 wcsrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t len,
  38     mbstate_t * __restrict ps __unused)
  39 {
  40         char buf[MB_LEN_MAX];
  41         const wchar_t *s;
  42         size_t nbytes;
  43         int nb;
  44
  45         s = *src;
  46         nbytes = 0;
  47
  48         if (dst == NULL) {
  49                 for (;;) {
  50                         if ((nb = (int)wcrtomb(buf, *s, NULL)) < 0)
  51                                 /* Invalid character - wcrtomb() sets errno. */
  52                                 return ((size_t)-1);
  53                         else if (*s == L'\0')
  54                                 return (nbytes + nb - 1);
  55                         s++;
  56                         nbytes += nb;
  57                 }
  58                 /*NOTREACHED*/
  59         }
  60
  61         while (len > 0) {
  62                 if (len > (size_t)MB_CUR_MAX) {
  63                         /* Enough space to translate in-place. */
  64                         if ((nb = (int)wcrtomb(dst, *s, NULL)) < 0) {
  65                                 *src = s;
  66                                 return ((size_t)-1);
  67                         }
  68                 } else {
  69                         /* May not be enough space; use temp. buffer. */
  70                         if ((nb = (int)wcrtomb(buf, *s, NULL)) < 0) {
  71                                 *src = s;
  72                                 return ((size_t)-1);
  73                         }
  74                         if (nb > (int)len)
  75                                 /* MB sequence for character won't fit. */
  76                                 break;
  77                         memcpy(dst, buf, nb);
  78                 }
  79                 if (*s == L'\0') {
  80                         *src = NULL;
  81                         return (nbytes + nb - 1);
  82                 }
  83                 s++;
  84                 dst += nb;
  85                 len -= nb;
  86                 nbytes += nb;
  87         }
  88         *src = s;
  89         return (nbytes);
  90 }