stdlib/mbstowcs.c

   1 /* Copyright (C) 1991-2017 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <wchar.h>
  21
  22
  23 /* Convert the string of multibyte characters in S to `wchar_t's in
  24    PWCS, writing no more than N.  Return the number written,
  25    or (size_t) -1 if an invalid multibyte character is encountered.
  26
  27    Attention: this function should NEVER be intentionally used.
  28    The interface is completely stupid.  The state is shared between
  29    all conversion functions.  You should use instead the restartable
  30    version `mbsrtowcs'.  */
  31 size_t
  32 mbstowcs (wchar_t *pwcs, const char *s, size_t n)
  33 {
  34   mbstate_t state;
  35
  36   memset (&state, '\0', sizeof state);
  37   /* Return how many we wrote (or maybe an error).  */
  38   return __mbsrtowcs (pwcs, &s, n, &state);
  39 }