wcsmbs/wcrtomb.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 wcrtomb (s, wc, ps)
  32      char *s;
  33      wchar_t wc;
  34      mbstate_t *ps;
  35 {
  36   char fake[1];
  37
  38   if (ps == NULL)
  39     ps = internal;
  40
  41   /*************************************************************\
  42   |* This is no complete implementation.  While the multi-byte *|
  43   |* character handling is not finished this will do.          *|
  44   \*************************************************************/
  45
  46   if (s == NULL)
  47     {
  48       s = fake;
  49       wc = L'\0';
  50     }
  51
  52   if (wc == L'\0')
  53     {
  54       /* FIXME Write any shift sequence to get to *PS == NULL.  */
  55       *ps = 0;
  56       *s = '\0';
  57       return 1;
  58     }
  59
  60   /* FIXME For now we don't handle real multi-byte encodings.  */
  61   if ((wc & ~0xff) != 0)
  62     {
  63       errno = EILSEQ;
  64       return (size_t) -1;
  65     }
  66
  67   *s = (char) wc;
  68   return 1;
  69 }