message.cc

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/*
 * Copyright (c) 1994-1997 Regents of the University of California.
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 *    must display the following acknowledgement:
 *      This product includes software developed by the Computer Systems
 *      Engineering Group at Lawrence Berkeley Laboratory.
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#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));
}

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