71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program 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 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
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* related information and legal notices. It is expected that any future
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* projects/authors will amend these files as needed.
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*
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* ---
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*
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* bit.h: Definitions for variable sized bitfields
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*
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* Known contributors to this file:
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*
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*/
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#ifndef _BIT_H_
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#define _BIT_H_
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typedef unsigned int bit_mask;
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typedef bit_mask *bit_fdmask;
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#ifndef bit
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#define bit(x) (1 << (x))
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#endif
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/*
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* File descriptor bit manipulation macros for use with select(2)
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*/
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#define BIT_NBBY 8
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#define BIT_BITSPERMASK (sizeof(bit_mask) * BIT_NBBY)
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#define BIT_SETB(a,b) \
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((b)[(a)/BIT_BITSPERMASK] |= 1 << ((a) % BIT_BITSPERMASK))
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#define BIT_CLRB(a,b) \
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((b)[(a)/BIT_BITSPERMASK] &= ~(1<< ((a) % BIT_BITSPERMASK)))
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#define BIT_ISSETB(a,b) \
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((b)[(a)/BIT_BITSPERMASK] & (1<< ((a) % BIT_BITSPERMASK)))
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#define BIT_ISCLRB(a,b) \
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(((b)[(a)/BIT_BITSPERMASK] & (1<<((a) % BIT_BITSPERMASK))) == 0)
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extern bit_fdmask bit_newfdmask();
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extern bit_fdmask bit_newfdmask(void);
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extern void bit_zero(bit_fdmask);
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extern void bit_not(bit_fdmask);
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extern void bit_copy(bit_fdmask, bit_fdmask);
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extern void bit_or(bit_fdmask, bit_fdmask);
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extern void bit_or3(bit_fdmask, bit_fdmask, bit_fdmask);
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extern void bit_and(bit_fdmask, bit_fdmask);
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extern void bit_and3(bit_fdmask, bit_fdmask, bit_fdmask);
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extern int bit_fd(bit_fdmask);
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#endif /* _BIT_H_ */
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