int main(int argc, char** argv) {
Register aRegister;
vector<int> parameters;
vector<char> commands;
extern char *optarg;
extern int optind;
int command = 0, err = 0;
if (argc < 2) {
cerr << "Incorrect Format: This program requires at minimum one argument" << endl;
return -1;
}
bool PRINT_FLAG = false;
while (( command = getopt( argc, argv, "i:s:r:l:v:p")) != -1) {
switch(command) {
case 'i':
// Sets the initial register value
for(int i=0;i<string(optarg).size();i++){
if(optarg[i]!='0' && optarg[i]!='1'){
cerr << "Invalid initial register value. Please enter only an combination of 0's and 1's" << endl;
return -1;
}
}
aRegister.setRegister(string(optarg));
break;
case 'p':
// Sets print flag to indicate whether to print results at end
PRINT_FLAG = true;
break;
case 'l':
//
if(optarg[0] != '0' && atoi(optarg) == 0) {
cerr << "Invalid parameter passed for -l : Must be a valid number" << endl;
return -1;
} else if(atoi(optarg) < 0){
cerr << "Invalid parameter passed for -l : Must be a non-negative number" << endl;
return -1;
}
commands.push_back('l');
parameters.push_back(atoi(optarg));
break;
case 'r':
if(optarg[0] != '0' && atoi(optarg) == 0) {
cerr << "Invalid parameter passed for -r : Must be a valid number" << endl;
return -1;
} else if(atoi(optarg) < 0){
cerr << "Invalid parameter passed for -r : Must be a non-negative number" << endl;
return -1;
}
commands.push_back('r');
parameters.push_back(atoi(optarg));
break;
case 's':
// Specifies the number of bits in the shift register
int shiftBits ;
shiftBits = atoi(optarg);
if (shiftBits <= 0) {
cerr << "Error: please specify a register size greater than 0" << endl;
return -1;
}
aRegister.shiftRegSize(shiftBits);
break;
case 'v':
// Value to inject in vacated bit if other than default
if((strlen(optarg) > 1) || (optarg[0] != '0' && optarg[0] != '1')){
cerr << "Invalid parameter: \"" << optarg << "\" given with -v argument" << endl << "Please enter 0 or 1 as parameter" << endl;
cerr << "Value must be 0 or 1" << endl;
return -1;
}
aRegister.setShiftValue(atoi(optarg));
break;
case '?':
err = 1;
break;
default:
err = 1;
break;
}
}
if (err) {
cerr << "Unknown or incomplete command line argument(s) passed to program" << endl;
return -1;
}
if(!excecuteOperations(commands, parameters, aRegister)) {
cerr << "Error executing shift operations" << endl;
return -1;
}
if(PRINT_FLAG){
aRegister.printValue();
}
return 0;
}
