isxdigit(3)                                                 isxdigit(3)

  isxdigit()

  NAME

    isxdigit() - hexadecimal-digit character test

  SYNOPSIS

    #include 

    int isxdigit (int c)

  DESCRIPTION

    The isxdigit(3) function tests whether c is a character of class xdigit in
    the program's current locale.

    In the POSIX locale, the character class xdigit includes only the
    characters:

    0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f

  RETURN VALUES

    The isxdigit(3) function returns zero if the character tests false and
    returns non-zero if the character tests true.

  SEE ALSO

    isalnum(3)

    isalpha(3)

    isblank(3)

    iscntrl(3)

    isdigit(3)

    isgraph(3)

    islower(3)

    isprint(3)

    ispunct(3)

    isspace(3)

    isupper(3)

    tolower(3)

    toupper(3)

  USAGE NOTES

    The isxdigit function is thread safe.

    The isxdigit function is not async-signal safe.