manpagez: man pages & more
man isxdigit(3)
Home | html | info | man

isxdigit(3)              BSD Library Functions Manual              isxdigit(3)


NAME

     isxdigit, ishexnumber -- hexadecimal-digit character test


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <ctype.h>

     int
     isxdigit(int c);

     int
     ishexnumber(int c);


DESCRIPTION

     The isxdigit() 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 ishexnumber() function behaves similarly to isxdigit(), but may rec-
     ognize 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.


RETURN VALUES

     The isxdigit() function returns zero if the character tests false and
     returns 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()
     function should be used instead.


SEE ALSO

     ctype(3), isalnum_l(3), iswxdigit(3), ascii(7)


STANDARDS

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


HISTORY

     The ishexnumber() function appeared in 4.4BSD.

BSD                              July 17, 2005                             BSD

Mac OS X 10.12.3 - Generated Sun Feb 5 14:48:58 CST 2017
© manpagez.com 2000-2017
Individual documents may contain additional copyright information.