date and time created 80/10/31 14:39:48 by mckusick

[unix-history] / usr / src / usr.bin / pascal / libpc / CTTOT.c

/* Copyright (c) 1979 Regents of the University of California */

static char sccsid[] = "@(#)CTTOT.c 1.1 %G%";

#include "h00vars.h"
#include "h01errs.h"

long    _mask[] = {     
                   0xffffffff , 0xfffffffe , 0xfffffffc , 0xfffffff8 ,
                   0xfffffff0 , 0xffffffe0 , 0xffffffc0 , 0xffffff80 ,
                   0xffffff00 , 0xfffffe00 , 0xfffffc00 , 0xfffff800 ,
                   0xfffff000 , 0xffffe000 , 0xffffc000 , 0xffff8000 ,
                   0xffff0000 , 0xfffe0000 , 0xfffc0000 , 0xfff80000 ,
                   0xfff00000 , 0xffe00000 , 0xffc00000 , 0xff800000 ,
                   0xff000000 , 0xfe000000 , 0xfc000000 , 0xf8000000 ,
                   0xf0000000 , 0xe0000000 , 0xc0000000 , 0x80000000 ,
                   0x00000000
                };
/*
* Constant set constructor
*/

long *
CTTOT(result, lowerbnd, upperbnd, paircnt, singcnt, data)

       long    *result;        /* pointer to final set */
       int     lowerbnd;       /* lower bound of set */
       int     upperbnd;       /* upper - lower of set */
       int     paircnt;        /* number of pairs to construct */
       int     singcnt;        /* number of singles to construct */
       int     data;           /* paircnt plus singcnt sets of data */
{
       register int    lower;
       register int    lowerdiv;
       register int    lowermod;
       register int    upper;
       int             upperdiv;
       int             uppermod;
       register int    *dataptr;
       register long   *lp;
       long            *limit;
       long            temp;
       long            cnt;

       limit = &result[(upperbnd + 1 + BITSPERLONG - 1) / BITSPERLONG];
       for (lp = result; lp < limit; )
               *lp++ = 0;
       dataptr = &data;
       for (cnt = 0; cnt < paircnt; cnt++) {
               upper = *dataptr++ - lowerbnd;
               if (upper < 0 || upper > upperbnd) {
                       ERROR(ECTUPR, *--dataptr);
                       return;
               }
               lower = *dataptr++ - lowerbnd;
               if (lower < 0 || lower > upperbnd) {
                       ERROR(ECTLWR, *--dataptr);
                       return;
               }
               if (lower > upper) {
                       continue;
               }
               lowerdiv = lower / BITSPERLONG;
               lowermod = lower % BITSPERLONG;
               upperdiv = upper / BITSPERLONG;
               uppermod = upper % BITSPERLONG;
               temp = _mask [lowermod];
               if ( lowerdiv == upperdiv ) {
                       temp &= ~_mask[ uppermod + 1 ];
               }
               result[ lowerdiv ] |= temp;
               limit = &result[ upperdiv-1 ];
               for ( lp = &result[ lowerdiv+1 ] ; lp <= limit ; lp++ ) {
                       *lp |= ~0;
               }
               if ( lowerdiv != upperdiv ) {
                       result[ upperdiv ] |= ~_mask[ uppermod + 1 ];
               }
       }
       for (cnt = 0; cnt < singcnt; cnt++) {
               lower = *dataptr++ - lowerbnd;
               if (lower < 0 || lower > upperbnd) {
                       ERROR(ECTSNG, *--dataptr);
                       return;
               }
               lowerdiv = lower / BITSPERLONG;
               lowermod = lower % BITSPERLONG;
               result[ lowerdiv ] |= ( 1 << lowermod );
       }
       return(result);
}