1  /* Copyright (C) 1995-2023 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 Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the 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     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <wchar.h>
      19  #include <loop_unroll.h>
      20  
      21  
      22  #ifdef WCSCPY
      23  # define __wcscpy WCSCPY
      24  #endif
      25  
      26  /* Copy SRC to DEST.  */
      27  wchar_t *
      28  __wcscpy (wchar_t *dest, const wchar_t *src)
      29  {
      30  #ifndef UNROLL_NTIMES
      31    return __wmemcpy (dest, src, __wcslen (src) + 1);
      32  #else
      33    /* Some architectures might have costly tail function call (powerpc
      34       for instance) where wmemcpy call overhead for smalls sizes might
      35       be more costly than just unrolling the main loop.  */
      36    wchar_t *wcp = dest;
      37  
      38  #define ITERATION(index)		\
      39    ({					\
      40       wchar_t c = *src++;		\
      41       *wcp++ = c;			\
      42       c != L'\0';			\
      43    })
      44  
      45    while (1)
      46      UNROLL_REPEAT(UNROLL_NTIMES, ITERATION);
      47    return dest;
      48  #endif
      49  }
      50  #ifndef WCSCPY
      51  weak_alias (__wcscpy, wcscpy)
      52  libc_hidden_def (__wcscpy)
      53  #endif