stdlib/mbstowcs.c

   1 /* Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <stdlib.h>
  20 #include <wchar.h>
  21
  22
  23 extern mbstate_t __no_r_state;  /* Defined in mbtowc.c.  */
  24
  25 /* Convert the string of multibyte characters in S to `wchar_t's in
  26    PWCS, writing no more than N.  Return the number written,
  27    or (size_t) -1 if an invalid multibyte character is encountered.
  28
  29    Attention: this function should NEVER be intentionally used.
  30    The interface is completely stupid.  The state is shared between
  31    all conversion functions.  You should use instead the restartable
  32    version `mbsrtowcs'.  */
  33 size_t
  34 mbstowcs (wchar_t *pwcs, const char *s, size_t n)
  35 {
  36   mbstate_t save_shift = __no_r_state;
  37   size_t written;
  38
  39   written = __mbsrtowcs (pwcs, &s, n, &__no_r_state);
  40
  41   /* Restore the old shift state.  */
  42   __no_r_state = save_shift;
  43
  44   /* Return how many we wrote (or maybe an error).  */
  45   return written;
  46 }