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85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
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/* 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
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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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extern void __cause_ex1 (char *exname, char *file, int lineno);
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/*
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* function __setbits
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*
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* parameters:
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* out result
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* bitlength length of bitstring in bits
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* startbit starting bitnumber
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* endbit ending bitnumber
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*
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* returns:
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* void
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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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* set all bits from starting bitnumber to ending bitnumber
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* in a powerset
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*
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*/
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void
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__setbits (out, bitlength, startbit, endbit)
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SET_WORD *out;
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unsigned long bitlength;
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long startbit;
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long endbit;
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{
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unsigned long i;
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if (out == NULL
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|| startbit < 0
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|| startbit >= bitlength
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|| endbit < 0
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|| endbit >= bitlength
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|| endbit < startbit)
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__cause_ex1 ("rangefail", "__setbits", __LINE__);
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if (bitlength <= SET_CHAR_SIZE)
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for (i = startbit; i <= endbit; i++)
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SET_BIT_IN_CHAR (*((SET_CHAR *)out), i);
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else if (bitlength <= SET_SHORT_SIZE)
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for (i = startbit; i <= endbit; i++)
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SET_BIT_IN_SHORT (*((SET_SHORT *)out), i);
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else
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{
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SET_WORD *p;
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unsigned long bitnr;
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/* FIXME - this is inefficient! */
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for (i = startbit; i <= endbit; i++)
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{
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p = out + (i / SET_WORD_SIZE);
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bitnr = i % SET_WORD_SIZE;
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SET_BIT_IN_WORD (*p, bitnr);
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}
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}
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}
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