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Annotation of tme/generic/tape.c, revision 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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