| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | |
| 3 | static char sccsid[] = "@(#)IN.c 1.1 %G%"; |
| 4 | |
| 5 | #include "h00vars.h" |
| 6 | |
| 7 | IN(element, lower, upper, setptr) |
| 8 | |
| 9 | int element; /* element to check */ |
| 10 | int lower; /* lowest element of set */ |
| 11 | int upper; /* upper - lower of set */ |
| 12 | char setptr[]; /* pointer to set */ |
| 13 | { |
| 14 | int indx; |
| 15 | |
| 16 | if ((indx = element - lower) < 0 || indx > upper) |
| 17 | return FALSE; |
| 18 | if (setptr[indx / BITSPERBYTE] & (1 << (indx % BITSPERBYTE))) |
| 19 | return TRUE; |
| 20 | return FALSE; |
| 21 | } |