common/message.cc

Go to the documentation of this file.

/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1994-1997 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the Computer Systems
 *  Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/common/message.cc,v 1.13 1998/08/12 23:41:08 gnguyen Exp $ (LBL)";
#endif

#include "agent.h"
#include "random.h"
#include "message.h"

int hdr_msg::offset_;

static class MessageHeaderClass : public PacketHeaderClass {
public:
    MessageHeaderClass() : PacketHeaderClass("PacketHeader/Message",
                         sizeof(hdr_msg)) {
        bind_offset(&hdr_msg::offset_);
    }
} class_msghdr;

class MessageAgent : public Agent {
 public:
    MessageAgent();
    int command(int argc, const char*const* argv);
    void recv(Packet*, Handler*);
};

static class MessageClass : public TclClass {
public:
    MessageClass() : TclClass("Agent/Message") {}
    TclObject* create(int, const char*const*) {
        return (new MessageAgent());
    }
} class_message;

MessageAgent::MessageAgent() : Agent(PT_MESSAGE)
{
    bind("packetSize_", &size_);
}

void MessageAgent::recv(Packet* pkt, Handler*)
{
    hdr_msg* mh = hdr_msg::access(pkt);
    char wrk[128];/*XXX*/
    sprintf(wrk, "%s recv {%s}", name(), mh->msg());

    Tcl& tcl = Tcl::instance();
    tcl.eval(wrk);

    Packet::free(pkt);
}

/*
 * $proc handler $handler
 * $proc send $msg
 */
int MessageAgent::command(int argc, const char*const* argv)
{
    Tcl& tcl = Tcl::instance();
    if (argc == 3) {
        if (strcmp(argv[1], "send") == 0) {
            Packet* pkt = allocpkt();
            hdr_msg* mh = hdr_msg::access(pkt);
            const char* s = argv[2];
            int n = strlen(s);
            if (n >= mh->maxmsg()) {
                tcl.result("message too big");
                Packet::free(pkt);
                return (TCL_ERROR);
            }
            strcpy(mh->msg(), s);
            send(pkt, 0);
            return (TCL_OK);
        }
    }
    return (Agent::command(argc, argv));
}

---