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.