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FreeBSD 11.0 - man page for ishexnumber (freebsd section 3)

ISXDIGIT(3)						   BSD 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. 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
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.
BSD
July 17, 2005 BSD

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