1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/* 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 <stdio.h>
#include "powerset.h"
extern void __cause_ex1 (char *exname, char *file, int lineno);
/*
* function __setbits
*
* parameters:
* out result
* bitlength length of bitstring in bits
* startbit starting bitnumber
* endbit ending bitnumber
*
* returns:
* void
*
* exceptions:
* rangefail
*
* abstract:
* set all bits from starting bitnumber to ending bitnumber
* in a powerset
*
*/
void
__setbits (out, bitlength, startbit, endbit)
SET_WORD *out;
unsigned long bitlength;
long startbit;
long endbit;
{
unsigned long i;
if (out == NULL
|| startbit < 0
|| startbit >= bitlength
|| endbit < 0
|| endbit >= bitlength
|| endbit < startbit)
__cause_ex1 ("rangefail", "__setbits", __LINE__);
if (bitlength <= SET_CHAR_SIZE)
for (i = startbit; i <= endbit; i++)
SET_BIT_IN_CHAR (*((SET_CHAR *)out), i);
else if (bitlength <= SET_SHORT_SIZE)
for (i = startbit; i <= endbit; i++)
SET_BIT_IN_SHORT (*((SET_SHORT *)out), i);
else
{
SET_WORD *p;
unsigned long bitnr;
/* FIXME - this is inefficient! */
for (i = startbit; i <= endbit; i++)
{
p = out + (i / SET_WORD_SIZE);
bitnr = i % SET_WORD_SIZE;
SET_BIT_IN_WORD (*p, bitnr);
}
}
}
|
