wcsmbs/wcscat.c

   1 /* Copyright (C) 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <wcstr.h>
  20
  21
  22 /* Append SRC on the end of DEST.  */
  23 wchar_t *
  24 wcscat (dest, src)
  25     wchar_t *dest;
  26     const wchar_t *src;
  27 {
  28   register wchar_t *s1 = dest;
  29   register const wchar_t *s2 = src;
  30   wchar_t c;
  31
  32   /* Find the end of the string.  */
  33   do
  34     c = *s1++;
  35   while (c != L'\0');
  36
  37   /* Make S1 point before the next character, so we can increment
  38      it while memory is read (wins on pipelined cpus).  */
  39   s1 -= 2;
  40
  41   do
  42     {
  43       c = *s2++;
  44       *++s1 = c;
  45     }
  46   while (c != L'\0');
  47
  48   return dest;
  49 }