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  #ifndef WCSRCHR
      22  # define WCSRCHR wcsrchr
      23  #endif
      24  
      25  /* Find the last occurrence of WC in WCS.  */
      26  wchar_t *
      27  WCSRCHR (const wchar_t *wcs, const wchar_t wc)
      28  {
      29    wchar_t *retval = NULL;
      30  
      31  #define ITERATION(index)		\
      32    ({					\
      33      if (*wcs == wc)			\
      34        retval = (wchar_t*) wcs;		\
      35      *wcs++ != L'\0';	\
      36    })
      37  
      38  #ifndef UNROLL_NTIMES
      39  # define UNROLL_NTIMES 1
      40  #endif
      41  
      42    while (1)
      43      UNROLL_REPEAT (UNROLL_NTIMES, ITERATION);
      44  
      45    return retval;
      46  }