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glibc  2.9
strcat.c
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00001 /* Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <string.h>
00020 #include <memcopy.h>
00021 
00022 #undef strcat
00023 
00024 /* Append SRC on the end of DEST.  */
00025 char *
00026 strcat (dest, src)
00027      char *dest;
00028      const char *src;
00029 {
00030   char *s1 = dest;
00031   const char *s2 = src;
00032   reg_char c;
00033 
00034   /* Find the end of the string.  */
00035   do
00036     c = *s1++;
00037   while (c != '\0');
00038 
00039   /* Make S1 point before the next character, so we can increment
00040      it while memory is read (wins on pipelined cpus).  */
00041   s1 -= 2;
00042 
00043   do
00044     {
00045       c = *s2++;
00046       *++s1 = c;
00047     }
00048   while (c != '\0');
00049 
00050   return dest;
00051 }
00052 libc_hidden_builtin_def (strcat)