NAME
isxdigit,
isxdigit_l, ishexnumber,
ishexnumber_l —
hexadecimal-digit character
test
LIBRARY
library “libc”
SYNOPSIS
#include
<ctype.h>
int
isxdigit(int
c);
int
isxdigit_l(int
c, locale_t
locale);
#include
<xlocale.h>
int
ishexnumber(int
c);
int
ishexnumber_l(int
c, locale_t
locale);
DESCRIPTION
Theisxdigit()
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(),
isxdigit_l(), ishexnumber(),
and ishexnumber_l() functions return 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(),
iswxdigit_l(),
iswhexnumber(), and
iswhexnumber_l() functions 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”).
The isxdigit_l() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
HISTORY
The ishexnumber() function appeared in
4.4BSD.