1 /* $Id: tape.c,v 1.1 2003/08/05 03:27:12 fredette Exp $ */
2
3 /* generic/tape.c - generic tape implementation support: */
4
5 /*
6 * Copyright (c) 2003 Matt Fredette
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Matt Fredette.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
25 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
32 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <tme/common.h>
37 _TME_RCSID("$Id: tape.c,v 1.1 2003/08/05 03:27:12 fredette Exp $");
38
39 /* includes: */
40 #include <tme/generic/tape.h>
41
42 /* this scores a tape connection: */
43 int
tme_tape_connection_score(struct tme_connection * conn,unsigned int * _score)44 tme_tape_connection_score(struct tme_connection *conn,
45 unsigned int *_score)
46 {
47 struct tme_tape_connection *conn_tape;
48 struct tme_tape_connection *conn_tape_other;
49
50 /* both sides must be tape connections: */
51 assert(conn->tme_connection_type == TME_CONNECTION_TAPE);
52 assert(conn->tme_connection_other->tme_connection_type == TME_CONNECTION_TAPE);
53
54 /* you cannot connect a tape to a tape, or a tape frontend to a tape
55 frontend: */
56 conn_tape = (struct tme_tape_connection *) conn;
57 conn_tape_other = (struct tme_tape_connection *) conn->tme_connection_other;
58 *_score
59 = ((conn_tape->tme_tape_connection_read != NULL
60 || conn_tape->tme_tape_connection_write != NULL)
61 != (conn_tape_other->tme_tape_connection_read != NULL
62 || conn_tape_other->tme_tape_connection_write != NULL));
63 return (TME_OK);
64 }
65