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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libc/] [ctype/] [isxdigit.c] - Rev 1765
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/* FUNCTION <<isxdigit>>---hexadecimal digit predicate INDEX isxdigit ANSI_SYNOPSIS #include <ctype.h> int isxdigit(int <[c]>); TRAD_SYNOPSIS #include <ctype.h> int isxdigit(int <[c]>); DESCRIPTION <<isxdigit>> is a macro which classifies ASCII integer values by table lookup. It is a predicate returning non-zero for hexadecimal digits, and <<0>> for other characters. It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF. You can use a compiled subroutine instead of the macro definition by undefining the macro using `<<#undef isxdigit>>'. RETURNS <<isxdigit>> returns non-zero if <[c]> is a hexadecimal digit (<<0>>--<<9>>, <<a>>--<<f>>, or <<A>>--<<F>>). PORTABILITY <<isxdigit>> is ANSI C. No supporting OS subroutines are required. */ #include <_ansi.h> #include <ctype.h> #undef isxdigit int _DEFUN(isxdigit,(c),int c) { return((_ctype_ + 1)[c] & ((_X)|(_N))); }