Annotation of src/usr.bin/telnet/ring.h, Revision 1.5
1.5 ! millert 1: /* $OpenBSD: ring.h,v 1.4 1998/05/15 03:16:42 art Exp $ */
1.2 niklas 2: /* $NetBSD: ring.h,v 1.5 1996/02/28 21:04:09 thorpej Exp $ */
3:
1.1 deraadt 4: /*
5: * Copyright (c) 1988, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
36: * from: @(#)ring.h 8.1 (Berkeley) 6/6/93
37: */
38:
39: /*
40: * This defines a structure for a ring buffer.
41: *
42: * The circular buffer has two parts:
43: *(((
44: * full: [consume, supply)
45: * empty: [supply, consume)
46: *]]]
47: *
48: */
49: typedef struct {
50: unsigned char *consume, /* where data comes out of */
51: *supply, /* where data comes in to */
52: *bottom, /* lowest address in buffer */
53: *top, /* highest address+1 in buffer */
54: *mark; /* marker (user defined) */
1.3 art 55: #if defined(ENCRYPTION)
56: unsigned char *clearto; /* Data to this point is clear text */
57: unsigned char *encryyptedto; /* Data is encrypted to here */
58: #endif
1.1 deraadt 59: int size; /* size in bytes of buffer */
60: u_long consumetime, /* help us keep straight full, empty, etc. */
61: supplytime;
62: } Ring;
63:
64: /* Here are some functions and macros to deal with the ring buffer */
65:
66: /* Initialization routine */
67: extern int
1.5 ! millert 68: ring_init(Ring *ring, unsigned char *buffer, int count);
1.1 deraadt 69:
70: /* Data movement routines */
71: extern void
1.5 ! millert 72: ring_supply_data(Ring *ring, unsigned char *buffer, int count);
1.1 deraadt 73: #ifdef notdef
74: extern void
1.5 ! millert 75: ring_consume_data(Ring *ring, unsigned char *buffer, int count);
1.1 deraadt 76: #endif
77:
78: /* Buffer state transition routines */
79: extern void
1.5 ! millert 80: ring_supplied(Ring *ring, int count),
! 81: ring_consumed(Ring *ring, int count);
1.1 deraadt 82:
83: /* Buffer state query routines */
84: extern int
1.5 ! millert 85: ring_empty_count(Ring *ring),
! 86: ring_empty_consecutive(Ring *ring),
! 87: ring_full_count(Ring *ring),
! 88: ring_full_consecutive(Ring *ring);
1.1 deraadt 89:
1.3 art 90: #if defined(ENCRYPTION)
91: extern void
92: ring_encrypt (Ring *ring, void (*func)()),
93: ring_clearto (Ring *ring);
94: #endif
95:
1.1 deraadt 96:
97: extern void
1.5 ! millert 98: ring_clear_mark(Ring *),
! 99: ring_mark(Ring *);
1.4 art 100:
101:
102: extern int
1.5 ! millert 103: ring_at_mark(Ring *);