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ISXDIGIT(3)	       FreeBSD 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.	 Re-
     gardless 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 re-
     turns 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 ob-
     solete and	may not	be supported in	future releases.  The iswxdigit()
     function should be	used instead.

SEE ALSO
     ctype(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.

FreeBSD	13.0			 July 17, 2005			  FreeBSD 13.0

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS | HISTORY

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