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ISXDIGIT(3) FreeBSD Library Functions Manual ISXDIGIT(3)
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