| |
| /* |
| 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 if <[c]> is |
| representable as an unsigned char or if <[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_ptr__[c+1] & ((_X)|(_N))); |
| } |
| |
