Function SV_UserMove

code/server/sv_client.cpp:414–524

================== SV_UserMove The message usually contains all the movement commands that were in the last three packets, so that the information in dropped packets can be recovered. On very fast clients, there may be multiple usercmd packed into each of the backup packets. ================== */

==================
*/
static void SV_UserMove( client_t *cl, msg_t *msg ) {
	int			i, start;
	int			cmdNum;
	int			firstNum;
	int			cmdCount;
	usercmd_t	nullcmd;
	usercmd_t	cmds[MAX_PACKET_USERCMDS];
	usercmd_t	*cmd, *oldcmd;
	//int			clientTime;
	int			serverId;

	cl->reliableAcknowledge = MSG_ReadLong( msg );
	serverId = MSG_ReadLong( msg );
	/*clientTime = */MSG_ReadLong( msg );
	cl->deltaMessage = MSG_ReadLong( msg );

	// cmdNum is the command number of the most recent included usercmd
	cmdNum = MSG_ReadLong( msg );
	cmdCount = MSG_ReadByte( msg );

	if ( cmdCount < 1 ) {
		Com_Printf( "cmdCount < 1\n" );
		return;
	}

	if ( cmdCount > MAX_PACKET_USERCMDS ) {
		Com_Printf( "cmdCount > MAX_PACKET_USERCMDS\n" );
		return;
	}

	memset( &nullcmd, 0, sizeof(nullcmd) );
	oldcmd = &nullcmd;
	for ( i = 0 ; i < cmdCount ; i++ ) {
		cmd = &cmds[i];
		MSG_ReadDeltaUsercmd( msg, oldcmd, cmd );
		oldcmd = cmd;
	}

	// if this is a usercmd from a previous gamestate,
	// ignore it or retransmit the current gamestate
	if ( serverId != sv.serverId ) {
		// if we can tell that the client has dropped the last
		// gamestate we sent them, resend it
		if ( cl->netchan.incomingAcknowledged > cl->gamestateMessageNum ) {
			Com_DPrintf( "%s : dropped gamestate, resending\n", cl->name );
			SV_SendClientGameState( cl );
		}
		return;
	}

	// if this is the first usercmd we have received
	// this gamestate, put the client into the world
	if ( cl->state == CS_PRIMED ) {

		SV_ClientEnterWorld( cl, &cmds[0], eSavedGameJustLoaded );
		if ( sv_mapname->string[0]!='_' )
		{
			char savename[MAX_QPATH];