www.pudn.com > wsc4c30.zip > ECHOPORT.C

/*  
** echoport.c 
** 
** Echoes characters incoming on COM1 and COM2 using threads.  
** Compile with -MT flag. 
**  
** Connect COM1 and/or COM2 to another computer using a NULL modem cable. 
** Start SIMPLE on other computer(s) at 38400 baud. 
** Start ECHOPORT.  
** Anything transmitted from remote is echoed back to remote by ECHOPORT. 
** 
** To terminate ECHOPORT, type ^C or disconnect cables (which drops DSR). 
*/ 
 
#include  
#include  
#include  
#include  
#include "wsc.h" 
 
#define NBR_THREADS 2 
 
typedef struct 
{int Port; 
 int Running; 
} ParamType; 
  
void Thread(PVOID pvoid) 
{int Code; 
 char Chr; 
 ParamType *ParamPtr; 
 ParamPtr = (ParamType *) pvoid; 
 /* starting thread */ 
 ParamPtr->Running = TRUE; 
 printf("COM%d: Starting thread.\n", 1+ParamPtr->Port); 
 /* reset port */ 
 Code = SioReset(ParamPtr->Port, 1024, 1024); 
 if(Code<0) 
   {/* Reset returned error */ 
    printf("COM%d: ERROR: %d\n", 1+ParamPtr->Port, Code); 
    ParamPtr->Running = FALSE; 
    return; 
   } 
 /* set baud rate, DTR, and RTS */ 
 SioBaud(ParamPtr->Port, 38400);  
 SioDTR(ParamPtr->Port, 'S'); 
 SioRTS(ParamPtr->Port, 'S');  
 /* look for incoming */ 
 while(1) 
   {/* this thread is done when DSR is dropped */ 
    if(SioDSR(ParamPtr->Port)==0) 
       {printf("COM%d: DSR dropped, aborting thread.\n", 1+ParamPtr->Port); 
        SioDone(ParamPtr->Port); 
        ParamPtr->Running = FALSE; 
        return; 
       } 
    /* get incoming */ 
    Code = SioGetc(ParamPtr->Port); 
    if(CodePort, Code); 
       return; 
      } 
    if(Code!=WSC_NO_DATA) 
      {/* good character */ 
       Chr = (char)Code; 
       /* echo character back */ 
       SioPutc(ParamPtr->Port, Chr); 
       /* display on screen */ 
       printf("%c\n",Chr); 
       /* user types ^Z or ESC to quit */ 
       if((Chr==0x1a)||(Chr==0x1b)) 
         {/* user has quit */ 
          SioDone(ParamPtr->Port); 
          ParamPtr->Running = FALSE; 
          printf("COM%d: Thread terminated by remote.\n",1+ParamPtr->Port);  
          return; 
         } 
      } /* end if */ 
    /* give up rest of thread time slice */ 
    Sleep(0); 
   } /* end while */ 
} 
 
void main(int argc, char *argv[]) 
{int T; 
 int Running; 
 ParamType Params[NBR_THREADS]; 
 printf("ECHOPORT 1.0 (Type ^C to exit)\n"); 
 if(argc!=1) 
   {printf("Usage: ECHOPORT\n"); 
    return; 
   } 
 /* start up each thread */ 
 for(T=0;T