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
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.
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
STANDARDS
The isxdigit() function conforms to
ISO/IEC 9899:1990
(“ISO C90”).
HISTORY
The ishexnumber() function appeared in
4.4BSD.