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Appendix A: C Source for Command String Generator

#include <stdio.h>

#include <math.h>

#include <stdlib.h>

#include <string.h>

void main( )

{

char inString[255],outString[261], buffer[3] ;

unsigned char checkSum;

int i;

printf(“Enter a command string: \n”);

gets(inString);

//blank input quits program

while (strlen(inString) )

{

checkSum = 0;

//get length of input string

sprintf(outString,”%02X”,strlen(inString)+ 6);

//insert length at beginning of dstring

strcat(outString, inString);

//put ‘00’ spacers at end of string

strcat(outString, “00”);

i = 0;

//sum ascii values of characters in expanded string

while (outString[i])

{

checkSum += outString[i++];

}

//twos complement

checkSum = ~(checksum) + 1;

sprintf(buffer,”%02X”,checkSum);

//append to string

strcat(outString,buffer);

printf(“%s\n”, outString);

printf(“Enter a command string: \n”);

gets(inString);

} ;

exit(0);

}

As an example of using this code, to get the checksum for the Arm to Away command, user

01, user code 1234, you would enter the string “aa011234” followed by the ENTER key.

The program should return “0Eaa011234003E.” To quit the program, just press ENTER

at the prompt.

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