wcsmbs/wcscpy.c

   1 /* Copyright (C) 1995-2019 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <wchar.h>
  20 #include <loop_unroll.h>
  21
  22
  23 #ifdef WCSCPY
  24 # define __wcscpy WCSCPY
  25 #endif
  26
  27 /* Copy SRC to DEST.  */
  28 wchar_t *
  29 __wcscpy (wchar_t *dest, const wchar_t *src)
  30 {
  31 #ifndef UNROLL_NTIMES
  32   return __wmemcpy (dest, src, __wcslen (src) + 1);
  33 #else
  34   /* Some architectures might have costly tail function call (powerpc
  35      for instance) where wmemcpy call overhead for smalls sizes might
  36      be more costly than just unrolling the main loop.  */
  37   wchar_t *wcp = dest;
  38
  39 #define ITERATION(index)                \
  40   ({                                    \
  41      wchar_t c = *src++;                \
  42      *wcp++ = c;                        \
  43      c != L'\0';                        \
  44   })
  45
  46   while (1)
  47     UNROLL_REPEAT(UNROLL_NTIMES, ITERATION);
  48   return dest;
  49 #endif
  50 }
  51 #ifndef WCSCPY
  52 weak_alias (__wcscpy, wcscpy)
  53 libc_hidden_def (__wcscpy)
  54 #endif