wcsmbs/wcscpy.c

   1 /* Copyright (C) 1995-2022 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