wcsmbs/wcscat.c

   1 /* Copyright (C) 1995-2016 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <wchar.h>
  20
  21 #ifdef WCSCAT
  22 # define __wcscat WCSCAT
  23 #endif
  24
  25 /* Append SRC on the end of DEST.  */
  26 wchar_t *
  27 __wcscat (wchar_t *dest, const wchar_t *src)
  28 {
  29   wchar_t *s1 = dest;
  30   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 }
  51 #ifndef WCSCAT
  52 weak_alias (__wcscat, wcscat)
  53 #endif