wcsmbs/mbrtowc.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 <wchar.h>
  21
  22
  23 static mbstate_t internal;
  24
  25 size_t
  26 mbrtowc (pwc, s, n, ps)
  27      wchar_t *pwc;
  28      const char *s;
  29      size_t n;
  30      mbstate_t *ps;
  31 {
  32   wchar_t to_wide;
  33
  34   if (ps == NULL)
  35     ps = &internal;
  36
  37   /*************************************************************\
  38   |* This is no complete implementation.  While the multi-byte *|
  39   |* character handling is not finished this will do.          *|
  40   \*************************************************************/
  41
  42   if (s == NULL)
  43     {
  44       pwc = NULL;
  45       s = "";
  46       n = 1;
  47     }
  48
  49   if (n == 0)
  50     return (size_t) -2;
  51
  52   /* For now.  */
  53   to_wide = (wchar_t) *s;
  54
  55   if (pwc != NULL)
  56     *pwc = to_wide;
  57
  58   if (pwc == L'\0')
  59     {
  60       *ps = 0;          /* This is required.  */
  61       return 0;
  62     }
  63
  64   /* Return code (size_t)-1 cannot happend for now.  */
  65   return 1;
  66 }