1: /* Copyright (C) 1995, 1996, 1997, 2001, 2005 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, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include <wchar.h>
   21: 
   22: 
   23: /* Append SRC on the end of DEST.  Check for overflows.  */
   24: wchar_t *
   25: __wcscat_chk (wchar_t *dest, const wchar_t *src, size_t destlen)
   26: {
   27:   register wchar_t *s1 = dest;
   28:   register const wchar_t *s2 = src;
   29:   wchar_t c;
   30: 
   31:   /* Find the end of the string.  */
   32:   do
   33:     {
   34:       if (__builtin_expect (destlen-- == 0, 0))
   35:         __chk_fail ();
   36:       c = *s1++;
   37:     }
   38:   while (c != L'\0');
   39: 
   40:   /* Make S1 point before the next character, so we can increment
   41:      it while memory is read (wins on pipelined cpus).  */
   42:   s1 -= 2;
   43:   ++destlen;
   44: 
   45:   do
   46:     {
   47:       if (__builtin_expect (destlen-- == 0, 0))
   48:         __chk_fail ();
   49:       c = *s2++;
   50:       *++s1 = c;
   51:     }
   52:   while (c != L'\0');
   53: 
   54:   return dest;
   55: }