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73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/* Implement POWERSET runtime actions for CHILL.
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Copyright (C) 1992,1993 Free Software Foundation, Inc.
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Author: Wilfried Moser, et al
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#define __CHILL_LIB__
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#include <stdio.h>
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#include "powerset.h"
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/*
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* function __inpowerset
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*
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* parameters:
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* bitno bit number within set
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* powerset the powerset
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* bitlength length of powerset in bits
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* minval number of lowest bit stored
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*
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* returns:
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* int 1 .. found
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* 0 .. not found
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*
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* exceptions:
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* rangefail
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*
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* abstract:
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* checks if a given value is included in a powerset
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*
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*/
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int
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__inpowerset (bitno, powerset, bitlength, minval)
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unsigned long bitno;
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SET_WORD *powerset;
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unsigned long bitlength;
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long minval;
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{
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if (bitno < minval || (bitno - minval) >= bitlength)
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return 0;
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bitno -= minval;
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if (bitlength <= SET_CHAR_SIZE)
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return GET_BIT_IN_CHAR (*((SET_CHAR *)powerset), bitno);
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else if (bitlength <= SET_SHORT_SIZE)
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return GET_BIT_IN_SHORT (*((SET_SHORT *)powerset), bitno);
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else
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return GET_BIT_IN_WORD (powerset[bitno / SET_WORD_SIZE],
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bitno % SET_WORD_SIZE);
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}
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