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Annotation of tme/generic/tape.c, revision 1.1.1.1

1.1       root        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
                     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: }

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