Category : Files from Magazines
Archive   : MAY91.ZIP
Filename : 2N05034A

/*
* File: NetBIOS.C
* Purpose: Contains network communications
* functions
*/

#include "netbios.h"


/* External functions */
void NetBIOS (NCB far *ncb);


/*
* NetClearNCB : initialize a network block
* Set all fields to binary 0.
*/
void NetClearNCB (NCB *ncb)
{
/** compile option -Ox causes memset to **/
/** be inlined automatically. **/
memset (ncb, 0, sizeof (NCB));
}

/*
* NetName : generic add/delete name handler
* Prepares for and calls NetBIOS to manage
* names
*/
int NetName (BYTE command, char *name)
{
NCB ncb;

NetClearNCB (&ncb);
ncb.command = command;
strcpy (ncb.name, name);
NetBIOS (&ncb);

return ncb.status;
}

/*
* NetAddname : Add a network name
*/
int NetAddname (char *name)
{
return NetName (NB_ADDNAME, name);
}

/*
* NetDelname : Delete a network name
*/
int NetDelname (char *name)
{
return NetName (NB_DELNAME, name);
}

/*
* NetHangUp : Terminate a session
*/
int NetHangUp (BYTE session)
{
NCB ncb;

NetClearNCB (&ncb);
ncb.command = NB_HANGUP;
ncb.localSession = session;
NetBIOS (&ncb);

return (ncb.status);
}

/*
* NetCall : Establish a session
* Attempt to establish a session between names
* local and remote. If established th local
* session number is set in *session.
*/
int NetCall (char *local, char *remote, BYTE *session)
{
NCB ncb;

NetClearNCB (&ncb);
ncb.command = NB_CALL;
strcpy (ncb.name, local);
strcpy (ncb.callName, remote);

/** set no receive timeouts **/
/** 10 second send timeouts **/
ncb.receiveTimeOut = 0;
ncb.sendTimeOut = 0;

NetBIOS (&ncb);
if (!ncb.status)
*session = ncb.localSession;

return ncb.status;
}

/*
* NetListen : Wait for a Call
* Wait for a session request between names
* local and remote. If established th local
* session number is set in *session.
*/
int NetListen (char *local, char *remote, BYTE *session)
{
NCB ncb;

NetClearNCB (&ncb);
ncb.command = NB_LISTEN;
strcpy (ncb.name, local);
strcpy (ncb.callName, remote);

/** set no receive timeouts **/
/** 10 second send timeouts **/
ncb.receiveTimeOut = 0;
ncb.sendTimeOut = 20;

NetBIOS (&ncb);
if (!ncb.status) {
*session = ncb.localSession;
memcpy (remote, ncb.callName, 16);
remote[16] = '\0';
}

return ncb.status;
}

/*
* NetTransfer : generic send/receive handler
* Trnasfers data over given session
*/
int NetTransfer (BYTE command, FPTR buf, int size,
BYTE session)
{
NCB ncb;

NetClearNCB (&ncb);
ncb.command = command;
ncb.localSession = session;
ncb.buffer = buf;
ncb.length = size;
NetBIOS (&ncb);

return ncb.status;
}

/*
* NetSend : Send data over a session
*/
int NetSend (FPTR buf, int size, BYTE session)
{
return NetTransfer (NB_SEND, buf, size, session);
}

/*
* NetReceive : Receive data over a session
*/
int NetReceive (FPTR buf, int size, BYTE session)
{
return NetTransfer (NB_RECV, buf, size, session);
}