wcsmbs/btowc.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 <stdio.h>
  21 #include <wchar.h>
  22
  23
  24 /* We use UTF8 encoding for multibyte strings and therefore a valid
  25    one byte multibyte string only can have a value from 0 to 0x7f.  */
  26 wint_t
  27 btowc (c)
  28      int c;
  29 {
  30   if (WEOF != (wint_t) EOF || c < 0 || c > 0x7f)
  31     return WEOF;
  32   else
  33     return (wint_t) c;
  34 }