debug/wcscpy_chk.c

   1 /* Copyright (C) 1995-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stddef.h>
  20 #include <wchar.h>
  21
  22
  23 /* Copy SRC to DEST.  */
  24 wchar_t *
  25 __wcscpy_chk (wchar_t *dest, const wchar_t *src, size_t n)
  26 {
  27   wint_t c;
  28   wchar_t *wcp;
  29
  30   if (__alignof__ (wchar_t) >= sizeof (wchar_t))
  31     {
  32       const ptrdiff_t off = dest - src - 1;
  33
  34       wcp = (wchar_t *) src;
  35
  36       do
  37         {
  38           if (__glibc_unlikely (n-- == 0))
  39             __chk_fail ();
  40           c = *wcp++;
  41           wcp[off] = c;
  42         }
  43       while (c != L'\0');
  44     }
  45   else
  46     {
  47       wcp = dest;
  48
  49       do
  50         {
  51           if (__glibc_unlikely (n-- == 0))
  52             __chk_fail ();
  53           c = *src++;
  54           *wcp++ = c;
  55         }
  56       while (c != L'\0');
  57     }
  58
  59   return dest;
  60 }