newlib/libc/ctype/iswxdigit.c

   1 /*
   2 FUNCTION
   3         <<iswxdigit>>, <<iswxdigit_l>>---hexadecimal digit wide character test
   4
   5 INDEX
   6         iswxdigit
   7
   8 INDEX
   9         iswxdigit_l
  10
  11 SYNOPSIS
  12         #include <wctype.h>
  13         int iswxdigit(wint_t <[c]>);
  14
  15         #include <wctype.h>
  16         int iswxdigit_l(wint_t <[c]>, locale_t <[locale]>);
  17
  18 DESCRIPTION
  19 <<iswxdigit>> is a function which classifies wide character values that
  20 are hexadecimal digits.
  21
  22 <<iswxdigit_l>> is like <<iswxdigit>> but performs the check based on the
  23 locale specified by the locale object locale.  If <[locale]> is
  24 LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
  25
  26 RETURNS
  27 <<iswxdigit>>, <<iswxdigit_l>> return non-zero if <[c]> is a hexadecimal digit wide character.
  28
  29 PORTABILITY
  30 <<iswxdigit>> is C99.
  31 <<iswxdigit_l>> is POSIX-1.2008.
  32
  33 No supporting OS subroutines are required.
  34 */
  35 #include <_ansi.h>
  36 #include <wctype.h>
  37
  38 int
  39 iswxdigit (wint_t c)
  40 {
  41   return (c >= (wint_t)'0' && c <= (wint_t)'9')
  42       || (c >= (wint_t)'a' && c <= (wint_t)'f')
  43       || (c >= (wint_t)'A' && c <= (wint_t)'F');
  44 }