debug/mbstowcs_chk.c

   1 /* Copyright (C) 2005-2022 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <locale.h>
  19 #include <string.h>
  20 #include <wchar.h>
  21
  22
  23 size_t
  24 __mbstowcs_chk (wchar_t *dst, const char *src, size_t len, size_t dstlen)
  25 {
  26   if (__glibc_unlikely (dstlen < len))
  27     __chk_fail ();
  28
  29   mbstate_t state;
  30
  31   memset (&state, '\0', sizeof state);
  32   /* Return how many we wrote (or maybe an error).  */
  33   return __mbsrtowcs (dst, &src, len, &state);
  34 }