wcsmbs/wcscat.c

   1 /* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3 Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <wchar.h>
  21
  22
  23 /* Append SRC on the end of DEST.  */
  24 wchar_t *
  25 wcscat (dest, src)
  26      wchar_t *dest;
  27      const wchar_t *src;
  28 {
  29   register wchar_t *s1 = dest;
  30   register const wchar_t *s2 = src;
  31   wchar_t c;
  32
  33   /* Find the end of the string.  */
  34   do
  35     c = *s1++;
  36   while (c != L'\0');
  37
  38   /* Make S1 point before the next character, so we can increment
  39      it while memory is read (wins on pipelined cpus).  */
  40   s1 -= 2;
  41
  42   do
  43     {
  44       c = *s2++;
  45       *++s1 = c;
  46     }
  47   while (c != L'\0');
  48
  49   return dest;
  50 }