[olug] OT? C programming question.

[Joe Gulizia]

I've been asked by a tech at an affiliate to post his code written in C below:

He is trying to find a command that will do the same as the WRITE command he is using...

One of the parameters has an extra character in it so the program fails......

He is using Ubuntu 10.04 as his OS.

This is the simpler of two programs he wrote:

Thanks,
Joe

(code start)


#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <time.h>

int main(void)
{
time_t     now;
struct tm  *ts;
int fd = 0;
int n = 0;
int i = 0;
int counter = 0;
int number = 15;



//If I omit the \r the receiver won't receive anything until a \r is sent
//while (n >= 0)  
//{ 
  /* Get the current time */
now = time(NULL);
ts = localtime(&now);

//if((ts->tm_hour == 16) && (ts->tm_min == 59) && (ts->tm_sec == 59) && (counter == 0))

      fd = open( "/dev/ttyS0", O_RDWR | O_NDELAY);
      /*if( fd == -1 )
         {
             perror( "open_port: Unable to open /dev/ttyS0 - " );
         } */
      //counter = 1;
      n = write(fd, "permch 1\r", 9);
      //printf("It is 5:00 PM, so channel has been changed to 4. \n");
      close(fd);

/*

//if((ts->tm_hour == 4) && (ts->tm_min == 59) && (ts->tm_sec == 59) && (counter == 0))
{
      fd = open( "/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
      if( fd == -1 )
         {
             perror( "open_port: Unable to open /dev/ttyS0 - " );
         }       
      printf("%d",fd);
      counter = 1;
      n = write(fd, "permch 1\r", 9);
      printf("It is 5:00 AM, so channel has been changed to 7. \n");
      close(fd);
}


if((ts->tm_hour == 5) && (ts->tm_min == 0) && (ts->tm_sec == 0) && (counter == 1))
{      
printf("Counter changed to 0 \n");
counter = 0;
}

if((ts->tm_hour == 17) && (ts->tm_min == 0) && (ts->tm_sec == 0) && (counter == 1))
{      
printf("Counter changed to 0 \n");
counter = 0;
}

//} */
printf("***PROGRAM FAIL*** will now terminate. \n");
return 0;
}


(code end)

This is from the user guide of the receiver (using a terminal emulator):

Using the PERMCH Command to dynamically change channels on the receiver. NOTE: all four FREQ CMD dip switches must be in the up position.
PERMCH (spacebar) 8 & Enter – dynamically selects Channel 1 
PERMCH (spacebar) 12 & Enter – dynamically selects Channel 2 
PERMCH (spacebar) 14 & Enter – dynamically selects Channel 3 
PERMCH (spacebar) 15 & Enter – dynamically selects Channel 4 
PERMCH (spacebar) 7 & Enter – dynamically selects Channel 5 
PERMCH (spacebar) 3 & Enter – dynamically selects Channel 6 
PERMCH (spacebar) 1 & Enter – dynamically selects Channel 7 
PERMCH (spacebar) 5 & Enter – dynamically selects Channel 8