ISXDIGIT(3)            FreeBSD Library Functions Manual            ISXDIGIT(3)

NAME

     isxdigit, ishexnumber, isxdigit_l, ishexnumber_l - hexadecimal-digit
     character test

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     isxdigit(int c);

     int
     ishexnumber(int c);

     int
     isxdigit_l(int c, locale_t loc);

     int
     ishexnumber_l(int c, locale_t loc);

DESCRIPTION

     The isxdigit() and isxdigit_l() functions test for any hexadecimal-digit
     character.  Regardless of locale, this includes the following characters
     only:

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

     The ishexnumber() and ishexnumber_l() functions behave similarly to
     isxdigit() and isxdigit_l(), but may recognize additional characters,
     depending on the current locale setting.

     The value of the argument must be representable as an unsigned char or
     the value of EOF.

     The _l-suffixed versions take an explicit locale argument, whereas the
     non-suffixed versions use the current global or per-thread locale.

RETURN VALUES

     The isxdigit() and isxdigit_l() functions return zero if the character
     tests false and return non-zero if the character tests true.

COMPATIBILITY

     The 4.4BSD extension of accepting arguments outside of the range of the
     unsigned char type in locales with large character sets is considered
     obsolete and may not be supported in future releases.  The iswxdigit() or
     iswxdigit_l() function should be used instead.

SEE ALSO

     ctype(3), ctype_l(3), iswxdigit(3), iswxdigit_l(3), xlocale(3), ascii(7)

STANDARDS

     The isxdigit() function conforms to ISO/IEC 9899:1990 ("ISO C90").

HISTORY

     The ishexnumber() function appeared in 4.4BSD.

FreeBSD 15.1-STABLE-HBSD       December 19, 2022                   ISXDIGIT(3)