lib/iswxdigit.c

   1 /* Test wide character for being a hexadecimal digit.
   2    Copyright (C) 2020-2021 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License along
  15    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 }