1  /* Test wide character for being a hexadecimal digit.
       2     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file 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
      12     GNU Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #include <config.h>
      18  
      19  /* Specification.  */
      20  #include <wctype.h>
      21  
      22  int
      23  iswxdigit (wint_t wc)
      24  {
      25    return ((wc >= '0' && wc <= '9')
      26  #if 'A' == 0x41 && 'a' == 0x61
      27            /* Optimization, assuming ASCII */
      28            || ((wc & ~0x20) >= 'A' && (wc & ~0x20) <= 'F')
      29  #else
      30            || (wc >= 'A' && wc <= 'F') || (wc >= 'a' && wc <= 'f')
      31  #endif
      32           );
      33  }