ISXDIGIT(3) BSD Library Functions Manual ISXDIGIT(3)

NAME
     iissxxddiiggiitt,, iisshheexxnnuummbbeerr - hexadecimal-digit character test

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     int
     iissxxddiiggiitt(int c);

     int
     iisshheexxnnuummbbeerr(int c);

DESCRIPTION
     The iissxxddiiggiitt() function tests 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 iisshheexxnnuummbbeerr() function behaves similarly to iissxxddiiggiitt(), but may rec-
     ognize additional characters, depending on the current locale setting.

     For single C chars locales (see multibyte(3)) the value of the argument
     is representable as an unsigned char or the value of EOF.

RETURN VALUES
     The iissxxddiiggiitt() function returns zero if the character tests false and
     returns non-zero if the character tests true.

CCOOMMPPAATTIIBBIILLIITTYY
     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 iisswwxxddiiggiitt()
     function should be used instead.

SEE ALSO
     ctype(3), iswxdigit(3), multibyte(3), ascii(7), isalnuml

STANDARDS     The iissxxddiiggiitt() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

HISTORY     The iisshheexxnnuummbbeerr() function appeared in 4.4BSD.

BSD                             August 21, 2004                            BSD