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AGWAPI.c
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/*
Copyright 2001-2022 John Wiseman G8BPQ
This file is part of LinBPQ/BPQ32.
LinBPQ/BPQ32 is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LinBPQ/BPQ32 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LinBPQ/BPQ32. If not, see http://www.gnu.org/licenses
*/
/*
AGWPE emulation Interface for BPQ32
Based on AGWtoBPQ
*/
#define _CRT_SECURE_NO_DEPRECATE
#include "CHeaders.h"
#include "bpq32.h"
// Internal AGW Interface
//#define VVICON 400
struct AGWHeader
{
int Port;
unsigned char DataKind;
unsigned char filler2;
unsigned char PID;
unsigned char filler3;
unsigned char callfrom[10];
unsigned char callto[10];
int DataLength;
int reserved;
};
struct AGWSocketConnectionInfo
{
int Number; // Number of record - for AGWConnections display
SOCKET socket;
SOCKADDR_IN sin;
BOOL SocketActive;
BOOL RawFlag;
BOOL MonFlag;
unsigned char CallSign1[10];
unsigned char CallSign2[10];
BOOL GotHeader;
int MsgDataLength;
struct AGWHeader AGWRXHeader;
};
struct BPQConnectionInfo
{
struct AGWSocketConnectionInfo * SocketIndex;
int BPQStream;
unsigned char CallKey[21]; // Port + two calls
BOOL Connecting; // Set while waiting for connection to complete
BOOL Listening;
int ApplMask;
} ConInfoRec;
char AGWPorts[1000];
byte AGWMessage[1000];
struct AGWHeader AGWTXHeader;
char SessionList[100];
struct BPQConnectionInfo AGWConnections[65];
#define MaxSockets 64
static struct AGWSocketConnectionInfo Sockets[MaxSockets+1];
int CurrentConnections;
static int CurrentSockets=0;
int AGWPort = 0;
int AGWSessions = 0;
int AGWMask = 0;
BOOL LoopMonFlag = FALSE;
BOOL Loopflag = FALSE;
extern char pgm[256];
SOCKET agwsock;
extern BPQVECSTRUC * AGWMONVECPTR;
extern int SemHeldByAPI;
char szBuff[80];
static int VisiblePortToRealPort[MaxBPQPortNo + 1];
int SetUpHostSessions();
int DisplaySessions();
int AGWDoStateChange(int Stream);
int AGWDoReceivedData(int Stream);
int AGWDoMonitorData();
int AGWConnected(struct BPQConnectionInfo * Con, int Stream);
int AGWDisconnected(struct BPQConnectionInfo * Con, int Stream);
int DeleteConnection(struct BPQConnectionInfo * Con);
int SendConMsgtoAppl(BOOL Incomming, struct BPQConnectionInfo * Con, char * CallSign);
int SendDisMsgtoAppl(char * Msg, struct AGWSocketConnectionInfo * sockptr);
int AGWSocket_Accept(SOCKET SocketId);
int Socket_Data(int SocketId,int error, int eventcode);
int AGWDataSocket_Read(struct AGWSocketConnectionInfo * sockptr, SOCKET sock);
int DataSocket_Write(struct AGWSocketConnectionInfo * sockptr, SOCKET sock);
int AGWGetSessionKey(char * key, struct AGWSocketConnectionInfo * sockptr);
int ProcessAGWCommand(struct AGWSocketConnectionInfo * sockptr);
int SendDataToAppl(int Stream, byte * Buffer, int Length);
int InternalAGWDecodeFrame(char * msg, char * buffer, int Stamp, int * FrameType);
int AGWDataSocket_Disconnect( struct AGWSocketConnectionInfo * sockptr);
int SendRawPacket(struct AGWSocketConnectionInfo * sockptr, char *txmsg, int Length);
int ShowApps();
int Terminate();
int SendtoSocket(SOCKET sock,char * Msg);
char * __cdecl Cmdprintf(TRANSPORTENTRY * Session, char * Bufferptr, const char * format, ...);
VOID Poll_AGW()
{
int state, change, i;
int Stream;
struct BPQConnectionInfo * Con;
struct AGWSocketConnectionInfo * sockptr;
// Look for incoming connects
fd_set readfd, writefd, exceptfd;
struct timeval timeout;
int retval;
int n;
int Active = 0;
SOCKET maxsock;
timeout.tv_sec = 0;
timeout.tv_usec = 0; // poll
FD_ZERO(&readfd);
FD_SET(agwsock, &readfd);
retval = select((int)agwsock + 1, &readfd, NULL, NULL, &timeout);
if (retval == -1)
{
retval = WSAGetLastError();
perror("listen select");
}
if (retval)
if (FD_ISSET((int)agwsock, &readfd))
AGWSocket_Accept(agwsock);
// look for data on any active sockets
maxsock = 0;
FD_ZERO(&readfd);
FD_ZERO(&writefd);
FD_ZERO(&exceptfd);
// Check for data on active streams
for (i = 0; i < CurrentConnections; i++)
{
Con = &AGWConnections[i];
Stream = Con->BPQStream;
SessionState(Stream, &state, &change);
if (change == 1)
{
if (state == 1)
// Connected
AGWConnected(Con, Stream);
else
AGWDisconnected(Con, Stream);
}
if (Con->SocketIndex) // Active Session
{
AGWDoReceivedData(Stream);
// Get current Session State. Any state changed is ACK'ed
// automatically. See BPQHOST functions 4 and 5.
SessionState(Stream, &state, &change);
if (change == 1)
{
if (state == 1)
// Connected
AGWConnected(Con, Stream);
else
AGWDisconnected(Con, Stream);
}
}
}
for (n = 1; n <= MaxSockets; n++)
{
sockptr=&Sockets[n];
if (sockptr->SocketActive)
{
SOCKET sock = sockptr->socket;
FD_SET(sock, &readfd);
FD_SET(sock, &exceptfd);
Active++;
if (sock > maxsock)
maxsock = sock;
}
}
if (Active)
{
retval = select((int)maxsock + 1, &readfd, &writefd, &exceptfd, &timeout);
if (retval == -1)
{
perror("data select yy");
Debugprintf("Select Error %d", WSAGetLastError());
}
else
{
if (retval)
{
// see who has data
for (n = 1; n <= MaxSockets; n++)
{
sockptr=&Sockets[n];
if (sockptr->SocketActive)
{
SOCKET sock = sockptr->socket;
if (FD_ISSET(sock, &exceptfd))
AGWDataSocket_Disconnect(sockptr);
if (FD_ISSET(sock, &readfd))
AGWDataSocket_Read(sockptr, sock);
}
}
}
}
}
AGWDoMonitorData();
}
static SOCKADDR_IN local_sin; /* Local socket - internet style */
static PSOCKADDR_IN psin;
BOOL AGWAPIInit()
{
struct PORTCONTROL * PORT = PORTTABLE;
int i = 1;
int v = 0;
char * ptr;
BOOL opt=TRUE;
if (AGWPort == 0)
return FALSE;
// Create listening socket
agwsock = socket( AF_INET, SOCK_STREAM, 0);
if (agwsock == INVALID_SOCKET)
{
sprintf(szBuff, "socket() failed error %d", WSAGetLastError());
WritetoConsole(szBuff);
return FALSE;
}
setsockopt (agwsock, SOL_SOCKET, SO_REUSEADDR, (const char FAR *)&opt,4);
psin=&local_sin;
psin->sin_family = AF_INET;
psin->sin_addr.s_addr = INADDR_ANY;
psin->sin_port = htons(AGWPort); /* Convert to network ordering */
if (bind(agwsock, (struct sockaddr FAR *) &local_sin, sizeof(local_sin)) == SOCKET_ERROR)
{
sprintf(szBuff, "bind(sock) failed Port %d Error %d", AGWPort, WSAGetLastError());
WritetoConsole(szBuff);
closesocket(agwsock);
return FALSE;
}
if (listen(agwsock, 5) < 0)
{
sprintf(szBuff, "listen(sock) failed Error %d", WSAGetLastError());
WritetoConsole(szBuff);
return FALSE;
}
SetUpHostSessions();
// Set up port List
ptr = &AGWPorts[0];
ptr += sprintf(ptr, "%d", NUMBEROFPORTS);
*(ptr)=';';
*(++ptr)=0;
while (PORT)
{
if (PORT->Hide == 0)
{
VisiblePortToRealPort[v++] = i - 1;
memcpy(ptr,"Port",4);
ptr += sprintf(ptr, "%d", i);
memcpy(ptr, " with ", 6);
ptr+=6;
memcpy(ptr, PORT->PORTDESCRIPTION, 29); // ";"
ptr+=29;
while (*(--ptr) == ' ') {}
ptr++;
*(ptr++)=';';
}
i++;
PORT=PORT->PORTPOINTER;
}
*(ptr)=0;
AGWMONVECPTR->HOSTAPPLFLAGS = 0x80; // Requext Monitoring
return TRUE;
}
int SetUpHostSessions()
{
int Stream, i;
if (AGWMask == 0) return 0;
for (i = 1; i <= AGWSessions; i++)
{
strcpy(pgm, "AGW");
Stream = FindFreeStream();
if (Stream == 255) break;
SetAppl(Stream, 2, AGWMask);
strcpy(pgm, "bpq32.exe");
AGWConnections[CurrentConnections].CallKey[0] = 0;
AGWConnections[CurrentConnections].BPQStream = Stream;
AGWConnections[CurrentConnections].SocketIndex = 0;
AGWConnections[CurrentConnections].Connecting = FALSE;
AGWConnections[CurrentConnections].Listening = TRUE;
AGWConnections[CurrentConnections].ApplMask = AGWMask;
CurrentConnections++;
}
return 0;
}
extern struct DATAMESSAGE * REPLYBUFFER;
extern BOOL AGWActive;
VOID SHOWAGW(TRANSPORTENTRY * Session, char * Bufferptr, char * CmdTail, CMDX * CMD)
{
// DISPLAY AGW Session Status
int i, con;
struct BPQConnectionInfo * Con;
byte key[21];
struct AGWSocketConnectionInfo * sockptr;
char IPAddr[20];
if (AGWActive == FALSE)
{
Bufferptr = Cmdprintf(Session, Bufferptr, "\rAGW Interface is not enabled\r");
SendCommandReply(Session, REPLYBUFFER, (int)(Bufferptr - (char *)REPLYBUFFER));
return;
}
Bufferptr = Cmdprintf(Session, Bufferptr, "\rSockets\r");
for (i = 1; i <= CurrentSockets; i++)
{
sockptr=&Sockets[i];
if (sockptr->SocketActive)
{
unsigned char work[4];
memcpy(work, &sockptr->sin.sin_addr.s_addr, 4);
sprintf(IPAddr, "%d.%d.%d.%d", work[0], work[1], work[2], work[3]);
Bufferptr = Cmdprintf(Session, Bufferptr, "%2d %-16s %5d %-10s %-10s\r", i, IPAddr, htons(sockptr->sin.sin_port), &sockptr->CallSign1, &sockptr->CallSign2);
}
else
{
Bufferptr = Cmdprintf(Session, Bufferptr, "%2d Idle\r", 1);
}
}
Bufferptr = Cmdprintf(Session, Bufferptr, "\rPort Calls Stream Socket Connecting Listening Mask\r");
for (con = 0; con < CurrentConnections; con++)
{
Con = &AGWConnections[con];
memcpy(key,Con->CallKey,21);
if (key[0] == 0) key[0] = 32;
key[10]=0;
key[20]=0;
Bufferptr = Cmdprintf(Session, Bufferptr, "%2c ", key[0]);
Bufferptr = Cmdprintf(Session, Bufferptr, "%-10s%-10s ",&key[1],&key[11]);
Bufferptr = Cmdprintf(Session, Bufferptr, "%2d %2d %s %s %X\r",
Con->BPQStream,
(Con->SocketIndex == 0) ? 0 : AGWConnections[con].SocketIndex->Number,
(Con->Connecting == 0) ? "FALSE" : "TRUE ",
(Con->Listening == 0) ? "FALSE" : "TRUE ",
Con->ApplMask);
}
SendCommandReply(Session, REPLYBUFFER, (int)(Bufferptr - (char *)REPLYBUFFER));
}
int DisplaySessions()
{
/* char * ptr;
int i, con;
byte key[21]; // As String, char As String
strcpy (SessionList," Port Calls Stream Socket Connecting Listening Mask");
SendDlgItemMessage(MainWnd,IDC_TEXTBOX3,LB_RESETCONTENT,0,0);
SendDlgItemMessage(MainWnd,IDC_TEXTBOX3,LB_ADDSTRING,0,(LPARAM) SessionList);
for (con = 0; con < CurrentConnections; con++)
{
memcpy(key,AGWConnections[con].CallKey,21);
if (key[0] == 0) key[0] = 32;
key[10]=0;
key[20]=0;
ptr=&SessionList[0];
i=sprintf(ptr,"%2d %2c ",con,key[0]);
ptr+=i;
i=sprintf(ptr,"%-10s%-10s ",&key[1],&key[11]);
ptr+=i;
i=sprintf(ptr,"%2d %2d %s %s %x",
AGWConnections[con].BPQStream,
(AGWConnections[con].SocketIndex == 0) ? 0 : AGWConnections[con].SocketIndex->Number,
(AGWConnections[con].Connecting == 0) ? "FALSE" : "TRUE ",
(AGWConnections[con].Listening == 0) ? "FALSE" : "TRUE ",
AGWConnections[con].ApplMask);
SendDlgItemMessage(MainWnd,IDC_TEXTBOX3,LB_ADDSTRING,0,(LPARAM) SessionList);
}
*/
return (0);
}
int AGWConnected(struct BPQConnectionInfo * Con, int Stream)
{
byte ConnectingCall[10];
byte * ApplCallPtr;
byte * keyptr;
byte ApplCall[10]="";
int i;
int ApplNum;
struct AGWSocketConnectionInfo * sockptr;
GetCallsign(Stream, ConnectingCall);
for (i=9;i>0;i--)
if (ConnectingCall[i]==32)
ConnectingCall[i]=0;
ApplNum = GetApplNum(Stream);
if (ApplNum == 0)
{
return 0; // Cant be an incomming connect
}
ApplCallPtr = GetApplCall(ApplNum);
if (ApplCallPtr != 0) memcpy(ApplCall,ApplCallPtr,10);
// Convert trailing spaces to nulls
for (i=9;i>0;i--)
if (ApplCall[i]==32)
ApplCall[i]=0;
// See if incomming connection
if (Con->Listening)
{
// Allocate Session and send "c" Message
//
// Find an AGW session
for (sockptr=&Sockets[1]; sockptr <= &Sockets[CurrentSockets]; sockptr++)
{
if (sockptr->SocketActive &&
(memcmp(sockptr->CallSign1, ApplCall, 10) == 0) || (memcmp(sockptr->CallSign2, ApplCall, 10) == 0))
{
// Create Key
keyptr=(byte *)&Con->CallKey;
*(keyptr++)='1';
memcpy(keyptr, ApplCall, 10);
keyptr+=10;
memcpy(keyptr,ConnectingCall, 10);
// Make sure key is not already in use
for (i = 0; i < CurrentConnections; i++)
{
if (Con->BPQStream == Stream)
continue; // Dont Check ourself!
if (AGWConnections[i].SocketIndex == sockptr &&
memcmp(&Con->CallKey, &AGWConnections[i].CallKey,21) == 0)
{
SendMsg(Stream, "AGWtoBPQ - Callsign is already connected\r", 43);
Sleep (500);
Disconnect(Stream);
Con->CallKey[0]=0;
return 0;
}
}
Con->Listening = FALSE;
Con->SocketIndex = sockptr;
DisplaySessions();
SendConMsgtoAppl(TRUE, Con, ConnectingCall);
return 0;
}
}
SendMsg(Stream, "No AGWPE Host Sessions available\r", 33);
Sleep (500);
Disconnect(Stream); // disconnect
return (0);
}
// Not listening ??
OutputDebugString("Inbound Connection on Outgoing Stream");
SendMsg(Stream, "AGWtoBPQ - Inbound Connection on Outgoing Stream\r", 49);
Sleep (500);
Disconnect(Stream); // disconnect
return (0);
}
int AGWDisconnected(struct BPQConnectionInfo * Con, int Stream)
{
struct AGWSocketConnectionInfo * sockptr;
char key[21];
memcpy(key,Con->CallKey,21);
sockptr = Con->SocketIndex;
if (sockptr != 0)
{
AGWTXHeader.Port = key[0] - 49;
memcpy(&AGWTXHeader.callfrom,&key[11],10);
memcpy(&AGWTXHeader.callto,&key[1],10);
// Send a "d" Message
// DisMsg = "*** DISCONNECTED From Station "
SendDisMsgtoAppl("*** DISCONNECTED From Station ", sockptr);
}
if (Con->ApplMask != 0)
{
Con->Listening = TRUE;
Con->SocketIndex = 0;
memset(&Con->CallKey ,0 ,21);
DisplaySessions();
}
else
{
DeleteConnection(Con);
}
return 0;
}
int AGWDoReceivedData(int Stream)
{
byte Buffer[400];
int len,count;
//Dim n As Integer, i As Integer, j As Integer, portcount As Integer
//Dim start As Integer
do
{
GetMsg(Stream, Buffer,&len, &count);
if (len > 0)
SendDataToAppl(Stream, Buffer,len);
}
while (count > 0);
return 0;
}
int AGWDoMonitorData()
{
byte Buffer[500];
int RawLen, Length;
byte Port;
struct AGWSocketConnectionInfo * sockptr;
byte AGWBuffer[1000];
int n;
int Stamp, Frametype;
BOOL RXFlag, NeedAGW;
// Look for Monitor Data
while (AGWMONVECPTR->HOSTTRACEQ)
{
MESSAGE * monbuff;
GetSemaphore(&Semaphore, 99);
monbuff = Q_REM((void *)&AGWMONVECPTR->HOSTTRACEQ);
RawLen = monbuff->LENGTH;
if (RawLen < 7 || RawLen > 350)
{
ReleaseBuffer(monbuff);
FreeSemaphore(&Semaphore);
return 0;
}
Stamp = (UINT)monbuff->Timestamp;
memcpy(Buffer, monbuff, RawLen);
ReleaseBuffer(monbuff);
FreeSemaphore(&Semaphore);
//' 4 byte chain
//' 1 byte port - top bit = transmit
//' 2 byte length (LO-HI)
Port = Buffer[4];
if (Port > 127)
{
RXFlag = FALSE;
Port = Port - 128;
}
else
{
RXFlag = TRUE;
}
NeedAGW = FALSE;
for (n = 1; n<= CurrentSockets; n++)
{
sockptr=&Sockets[n];
if (sockptr->SocketActive && sockptr->MonFlag) NeedAGW = TRUE;
}
if (NeedAGW)
{
if (RXFlag || LoopMonFlag) // only send txed frames if requested
{
Length = InternalAGWDecodeFrame(Buffer, AGWBuffer,Stamp, &Frametype);
//
// Decode frame and send to applications which have requested monitoring
//
if (Length > 0)
{
AGWTXHeader.Port = Port - 1; // AGW Ports start from 0
/*
* Patch by D. van der Locht 09-10-2020
* Added support for sending 'T' frames to AGW clients if LoopMonFlag is set.
*/
if (RXFlag)
{
if (Frametype == 3)
{
AGWTXHeader.DataKind = 'U';
}
else
{
if (Frametype && 1 == 0)
{
AGWTXHeader.DataKind = 'I';
}
else
{
AGWTXHeader.DataKind = 'S';
}
}
}
else
{
AGWTXHeader.DataKind = 'T';
}
AGWTXHeader.DataLength = Length;
memset(AGWTXHeader.callfrom, 0,10);
ConvFromAX25(monbuff->ORIGIN, AGWTXHeader.callfrom);
for (n = 1; n<= CurrentSockets; n++)
{
sockptr=&Sockets[n];
if (sockptr->SocketActive && sockptr->MonFlag)
SendRawPacket(sockptr, AGWBuffer, Length);
}
}
}
}
RawLen = RawLen - 6;
if (RXFlag || Loopflag) // Send transmitted frames if requested
{
//
// Send raw data to any sockets that have requested Raw frames
//
Buffer[6]=0;
AGWTXHeader.Port = Port - 1; // AGW Ports start from 0
AGWTXHeader.DataKind = 'K';
AGWTXHeader.DataLength = RawLen;
for (n = 1; n<= CurrentSockets; n++)
{
sockptr=&Sockets[n];
if (sockptr->SocketActive && sockptr->RawFlag)
SendRawPacket(sockptr, &Buffer[6], RawLen);
}
}
}
return 0;
}
int DeleteConnection(struct BPQConnectionInfo * Con)
{
int i;
int con;
//
// remove specified session
//
SetAppl(Con->BPQStream, 0, 0);
Disconnect(Con->BPQStream);
DeallocateStream(Con->BPQStream);
// move all down one
con = (int)(Con - &AGWConnections[0]);
for (i = con; i <= CurrentConnections - 1; i++)
{
memcpy(&AGWConnections[i],&AGWConnections[i + 1],sizeof ConInfoRec);
}
CurrentConnections--;
return 0;
}
int SendConMsgtoAppl(BOOL Incomming, struct BPQConnectionInfo * Con, char * CallSign)
{
char key[21];
char ConMsg[80]="*** CONNECTED ";
struct AGWSocketConnectionInfo * sockptr;
memcpy(key,&Con->CallKey,21);
sockptr = Con->SocketIndex;
AGWTXHeader.Port = key[0] - 49;
memcpy(AGWTXHeader.callfrom, &key[11],10);
memcpy(AGWTXHeader.callto, &key[1],10);
/* '
' Send a "C" Message
'
'01 00 00 00 43 00 00 00 47 4D 38 42 50 51 2D 34 C GM8BPQ-4
'00 EA 47 4D 38 42 50 51 2D 34 00 FF 25 00 00 00 êGM8BPQ-4 ÿ%
'00 00 00 00 2A 2A 2A 20 43 4F 4E 4E 45 43 54 45 *** CONNECTE
'44 20 57 69 74 68 20 53 74 61 74 69 6F 6E 20 47 D With Station G
'4D 38 42 50 51 2D 34 0D 00 M8BPQ-4
*/
AGWTXHeader.DataKind = 'C';
AGWTXHeader.PID = 0;
if (Incomming)
strcat(ConMsg,"To");
else
strcat(ConMsg,"With");
strcat(ConMsg," Station ");
strcat(ConMsg,CallSign);
AGWTXHeader.DataLength = (int)strlen(ConMsg)+1;
SendtoSocket(sockptr->socket, ConMsg);
return 0;
}
int SendDisMsgtoAppl(char * Msg, struct AGWSocketConnectionInfo * sockptr)
{
byte DisMsg[100];
strcpy(DisMsg,Msg);
strcat(DisMsg,(const char *)&AGWTXHeader.callfrom);
AGWTXHeader.Port = sockptr->AGWRXHeader.Port;
AGWTXHeader.DataKind = 'd';
strcat(DisMsg,"\r");
AGWTXHeader.DataLength = (int)strlen(DisMsg)+1;
SendtoSocket(sockptr->socket, DisMsg);
return 0;
}
int AGWSocket_Accept(SOCKET SocketId)
{
int n,addrlen;
struct AGWSocketConnectionInfo * sockptr;
SOCKET sock;
// Find a free Socket
for (n = 1; n <= MaxSockets; n++)
{
sockptr=&Sockets[n];
if (sockptr->SocketActive == FALSE)
{
addrlen=sizeof(struct sockaddr);
memset(sockptr, 0, sizeof(struct AGWSocketConnectionInfo));
sock = accept(SocketId, (struct sockaddr *)&sockptr->sin, &addrlen);
if (sock == INVALID_SOCKET)
{
sprintf(szBuff, "AGW accept() failed Error %d\r", WSAGetLastError());
WritetoConsole(szBuff);
return FALSE;
}
sockptr->socket = sock;
sockptr->SocketActive = TRUE;
sockptr->GotHeader = FALSE;
sockptr->MsgDataLength = 0;
sockptr->Number = n;
if (CurrentSockets < n) CurrentSockets=n; //Record max used to save searching all entries
ShowApps();
return 0;
}
}
// Should accept, then immediately close
return 0;
}
int SendtoSocket(SOCKET sock, char * Msg)
{
int len;
int n;
char * ptr;
len = AGWTXHeader.DataLength;
// Make sure calls are null terminated
n = 10;
ptr = &AGWTXHeader.callfrom[9];
while (n-- && *(ptr) == ' ')
{
*(ptr) = 0;
ptr--;
}
n = 10;
ptr = &AGWTXHeader.callto[9];
while (n-- && *(ptr) == ' ')
{
*(ptr) = 0;