wcsmbs/wcsrtombs.c

   1 /* Copyright (C) 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3 Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <wchar.h>
  22
  23 #ifndef EILSEQ
  24 #define EILSEQ EINVAL
  25 #endif
  26
  27
  28 static mbstate_t internal;
  29
  30 size_t
  31 wcsrtombs (dst, src, len, ps)
  32      char *dst;
  33      const wchar_t **src;
  34      size_t len;
  35      mbstate_t *ps;
  36 {
  37   size_t result = 0;
  38
  39   if (ps == NULL)
  40     ps = &internal;
  41
  42   /*************************************************************\
  43   |* This is no complete implementation.  While the multi-byte *|
  44   |* character handling is not finished this will do.          *|
  45   \*************************************************************/
  46
  47   while (len > 0 && **src != L'\0')
  48     {
  49       if ((**src & ~0xff) != 0)
  50         {
  51           errno = EILSEQ;
  52           return (size_t) -1;
  53         }
  54
  55       if (dst != NULL)
  56         dst[result] = (char) **src;
  57       ++result;
  58       ++(*src);
  59       --len;
  60     }
  61
  62   if (len > 0)
  63     {
  64       if (dst != NULL)
  65         {
  66           dst[result] = '\0';
  67           *ps = 0;
  68         }
  69       *src = NULL;
  70     }
  71
  72   return result;
  73 }