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