1: /* Copyright (C) 1991, 1997, 2003, 2004 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, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <string.h>
   20: #include <memcopy.h>
   21: 
   22: 
   23: /* Append SRC on the end of DEST.  */
   24: char *
   25: __strcat_chk (dest, src, destlen)
   26:      char *dest;
   27:      const char *src;
   28:      size_t destlen;
   29: {
   30:   char *s1 = dest;
   31:   const char *s2 = src;
   32:   reg_char c;
   33: 
   34:   /* Find the end of the string.  */
   35:   do
   36:     {
   37:       if (__builtin_expect (destlen-- == 0, 0))
   38:         __chk_fail ();
   39:       c = *s1++;
   40:     }
   41:   while (c != '\0');
   42: 
   43:   /* Make S1 point before the next character, so we can increment
   44:      it while memory is read (wins on pipelined cpus).  */
   45:   ++destlen;
   46:   s1 -= 2;
   47: 
   48:   do
   49:     {
   50:       if (__builtin_expect (destlen-- == 0, 0))
   51:         __chk_fail ();
   52:       c = *s2++;
   53:       *++s1 = c;
   54:     }
   55:   while (c != '\0');
   56: 
   57:   return dest;
   58: }