66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2013, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire 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 3 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, see <http://www.gnu.org/licenses/>.
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* ringbuf.h: Simple ring buffer
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*
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* Known contributors to this file:
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* Markus Armbruster, 2007
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*/
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#ifndef RINGBUF_H
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#define RINGBUF_H
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#include <stddef.h>
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#define RING_SIZE 4096
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/* Ring buffer, consumer reads, producer writes */
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struct ring {
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/* All members are private! */
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/*
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* Consumer reads from buf[cons % RING_SIZE], incrementing cons
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* Produces writes to buf[prod % RING_SIZE], incrementing prod
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* prod == cons: empty
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* prod == cons + RING_SIZE: full
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* invariant: prod - cons <= RING_SIZE
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*/
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unsigned cons, prod;
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unsigned char buf[RING_SIZE];
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};
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extern void ring_init(struct ring *);
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extern int ring_len(struct ring *);
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extern int ring_space(struct ring *);
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extern int ring_peek(struct ring *, int);
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extern int ring_getc(struct ring *);
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extern int ring_putc(struct ring *, unsigned char);
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extern int ring_putm(struct ring *, void *, size_t);
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extern void ring_discard(struct ring *, int);
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extern int ring_search(struct ring *, char *);
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extern int ring_from_file(struct ring *, int fd);
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extern int ring_to_file(struct ring *, int fd);
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#endif
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