| /* 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, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* As a special exception, if you link this library with other files, |
| some of which are compiled with GCC, to produce an executable, |
| this library does not by itself cause the resulting executable |
| to be covered by the GNU General Public License. |
| This exception does not however invalidate any other reasons why |
| the executable file might be covered by the GNU General Public License. */ |
| |
| #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); |
| } |
| } |
| } |