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/* Implement POWERSET runtime actions for CHILL.
Copyright (C) 1992,1993 Free Software Foundation, Inc.
Author: Wilfried Moser, et al
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define __CHILL_LIB__
#include "config.h"
#include <stdio.h>
#include "powerset.h"
extern void __cause_ex1 (char *exname, char *file, int lineno);
/*
* function __setbitpowerset
*
* parameters:
* set destination set
* bitlength length of powerset in bits
* minval lowest valid set value
* bitno bit number within set
* new_value zero or one - (new bit value)
*
* returns:
* int 1 .. found
* 0 .. not found
*
* exceptions:
* rangefail
*
* abstract:
* checks if a given value is included in a powerset
*
*/
void
__setbitpowerset (powerset, bitlength, minval, bitno, new_value, filename, lineno)
SET_WORD *powerset;
unsigned long bitlength;
long minval;
long bitno;
char new_value; /* booleans are represented as 8 bit value */
char * filename;
int lineno;
{
if (powerset == NULL
|| bitno < minval
|| (bitno - minval) >= bitlength)
__cause_ex1 ("rangefail", filename, lineno);
bitno -= minval;
if (bitlength <= SET_CHAR_SIZE)
{
if (new_value & 1)
SET_BIT_IN_CHAR (*((SET_CHAR *)powerset), bitno);
else
CLEAR_BIT_IN_CHAR (*((SET_CHAR *)powerset), bitno);
}
else if (bitlength <= SET_SHORT_SIZE)
{
if (new_value & 1)
SET_BIT_IN_SHORT (*((SET_SHORT *)powerset), bitno);
else
CLEAR_BIT_IN_SHORT (*((SET_SHORT *)powerset), bitno);
}
else
{
powerset += (bitno/SET_WORD_SIZE);
bitno %= SET_WORD_SIZE;
if (new_value & 1)
SET_BIT_IN_WORD (*powerset, bitno);
else
CLEAR_BIT_IN_WORD (*powerset, bitno);
}
}
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