wcsmbs/wcsrchr.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>
   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 #ifndef WCSRCHR
  23 # define WCSRCHR wcsrchr
  24 #endif
  25
  26 /* Find the last occurrence of WC in WCS.  */
  27 wchar_t *
  28 WCSRCHR (const wchar_t *wcs, const wchar_t wc)
  29 {
  30   wchar_t *retval = NULL;
  31
  32 #define ITERATION(index)                \
  33   ({                                    \
  34     if (*wcs == wc)                     \
  35       retval = (wchar_t*) wcs;          \
  36     *wcs++ != L'\0';    \
  37   })
  38
  39 #ifndef UNROLL_NTIMES
  40 # define UNROLL_NTIMES 1
  41 #endif
  42
  43   while (1)
  44     UNROLL_REPEAT (UNROLL_NTIMES, ITERATION);
  45
  46   return retval;
  47 }