int main(){
int intNo;
char fileName[WORD_SIZE], option;
FILE* diskFp;
createDisk(DO_NOT_FORMAT); //in case the disk file is not present
loadFileToVirtualDisk();
while(1){
menu();
scanf("%c", &option);
switch(option){
case '1':
listAllFiles();
break;
case '2':
printf("\nEnter Filename\n");
scanf("%s", fileName);
fileName[WORD_SIZE - 1] = '\0';
loadExecutableToDisk(fileName);
break;
case '3':
printf("\nEnter Filename\n");
scanf("%s", fileName);
fileName[WORD_SIZE - 1] = '\0';
deleteExecutableFromDisk(fileName);
break;
case '4':
printf("\nEnter Filename\n");
scanf("%s", fileName);
fileName[WORD_SIZE - 1] = '\0';
loadOSCode(fileName);
break;
case '5':
printf("\nEnter interrupt no:\n");
scanf("%d", &intNo);
printf("Enter filename\n");
scanf("%s", fileName);
loadIntCode(fileName, intNo);
break;
case '6':
printf("Formatting...............\n");
createDisk(FORMAT);
break;
case '7':
printf("\nEnter Filename\n");
scanf("%s", fileName);
fileName[WORD_SIZE - 1] = '\0';
loadINITCode(fileName);
break;
case '8':
printf("Exiting...........\n");
exit(0);
break;
case '9':
loadOSCode("startup.esim");
loadIntCode("int0.esim", 0);
loadIntCode("int1.esim", 1);
loadIntCode("int2.esim", 2);
loadIntCode("int3.esim", 3);
loadIntCode("int4.esim", 4);
loadIntCode("int5.esim", 5);
loadIntCode("int6.esim", 6);
loadIntCode("int7.esim", 7);
loadINITCode("init.esim");
break;
default:
printf("Invalid option\n");
break;
}
scanf("%c", &option);
while(option != '\n')
scanf("%c", &option);
}
}
/*
Function to process commands
*/
void runCommand(char command[])
{
char *name = strtok(command, " ");
char *arg1, *arg2, *arg3;
if(strcmp(name,"help")==0) //"help" to display all commands
{
printf(" fdisk \n\t Format the disk with XFS filesystem\n");
printf(" load --exec <pathname> \n\t Loads an executable file to XFS disk \n");
printf(" load --init <pathname> \n\t Loads INIT code to XFS disk \n");
printf(" load --data <pathname> \n\t Loads a data file to XFS disk \n");
printf(" load --os <pathname> \n\t Loads OS startup code to XFS disk \n");
printf(" load --int=timer <pathname>\n\t Loads Timer Interrupt routine to XFS disk \n");
printf(" load --int=[1-7] <pathname>\n\t Loads the specified Interrupt routine to XFS disk \n");
printf(" load --exhandler <pathname> \n\t Loads exception handler routine to XFS disk \n");
printf(" rm --exec <xfs_filename>\n\t Removes an executable file from XFS disk \n");
printf(" rm --init <xfs_filename> \n\t Removes INIT code from XFS disk \n");
printf(" rm --data <xfs_filename>\n\t Removes a data file from XFS disk \n");
printf(" rm --os \n\t Removes OS startup code from XFS disk \n");
printf(" rm --int=timer \n\t Removes the Timer Interrupt routine from XFS disk \n");
printf(" rm --int=[1-7] \n\t Removes the specified Interrupt routine from XFS disk \n");
printf(" rm --exhandler\n\t Removes the exception handler routine from XFS disk \n");
printf(" ls \n\t List all files\n");
printf(" df \n\t Display free list and free space\n");
printf(" cat <xfs_filename> \n\t to display contents of a file\n");
printf(" copy <start_blocks> <end_block> <unix_filename>\n\t Copies contents of specified range of blocks to a UNIX file.\n");
printf(" exit \n\t Exit the interface\n");
}
else if (strcmp(name,"fdisk")==0) //formatting the disk with XFS partition
{
printf("Formatting Complete. \"disk.xfs\" created.\n");
createDisk(FORMAT);
}
else if (strcmp(name,"load")==0) //loads files to XFS disk.
{
int fd;
fd = open(DISK_NAME, O_RDONLY, 0666);
if(fd < 0){
printf("Unable to Open Disk File\n");
return;
}
close(fd);
arg1 = strtok(NULL, " ");
arg2 = strtok(NULL, " ");
char *int_command = strtok(arg1, "=");
char *intType = strtok(NULL, "=");
char *fileName = arg2;;
if(fileName!=NULL)
fileName[50] = '\0';
else
{
printf("Missing <pathname> for load. See \"help\" for more information\n");
return;
}
if (strcmp(arg1,"--exec")==0)
{
char *c;
if (strlen(basename(fileName)) > 12)
{
printf("Filename is more than 12 characters long\n");
return;
}
c = strrchr(fileName,'.');
if (c == NULL || strcmp(c,".xsm") != 0)
{
printf("Filename does not have \".xsm\" extension\n");
return;
}
loadExecutableToDisk(fileName); //loads executable file to disk.
}
else if (strcmp(arg1,"--init")==0)
loadINITCode(fileName); //loads init code to disk
else if (strcmp(arg1,"--data")==0)
{
char *c;
if (strlen(basename(fileName)) > 12)
{
printf("Filename is more than 12 characters long\n");
return;
}
c = strrchr(fileName,'.');
if (c == NULL || strcmp(c,".dat") != 0)
{
printf("Filename does not have \".dat\" extension\n");
return;
}
loadDataToDisk(fileName); //loads data file to disk.
}
else if (strcmp(arg1,"--os")==0)
loadOSCode(fileName); //loads OS startup code to disk
else if (strcmp(arg1,"--int")==0)
{
if(strcmp(intType,"timer")==0)
{
loadTimerCode(fileName);
}
else
{
int intNo = atoi(intType);
if(intNo >=1 && intNo <=NO_OF_INTERRUPTS)
loadIntCode(fileName, intNo);
else
{
printf("Invalid argument for \"--int=\" \n");
return;
}
}
}
else if (strcmp(arg1,"--exhandler")==0)
{
loadExHandlerToDisk(fileName); //loads exception handler routine to disk.
}
else
printf("Invalid argument \"%s\" for load. See \"help\" for more information\n",arg1);
}
else if (strcmp(name,"rm")==0) //removes files to XFS disk.
{
int fd;
fd = open(DISK_NAME, O_RDONLY, 0666);
if(fd < 0){
printf("Unable to Open Disk File\n");
return;
}
close(fd);
arg1 = strtok(NULL, " ");
arg2 = strtok(NULL, " ");
char *int_command = strtok(arg1, "=");
char *intType = strtok(NULL, "=");
char *fileName = arg2;;
if(fileName!=NULL)
fileName[50] = '\0';
if (strcmp(arg1,"--exec")==0)
{
if(fileName==NULL)
{
printf("Missing <xfs_filename> for rm. See \"help\" for more information\n");
return;
}
deleteExecutableFromDisk(fileName); //removes executable file fron disk.
}
else if (strcmp(arg1,"--init")==0)
{
deleteINITFromDisk(); //removes init code from disk
}
else if (strcmp(arg1,"--data")==0)
{
if(fileName==NULL)
{
printf("Missing <xfs_filename> for rm. See \"help\" for more information\n");
return;
}
deleteDataFromDisk(fileName); //removes data file from disk..
}
else if (strcmp(arg1,"--os")==0)
{
deleteOSCodeFromDisk(); //removes OS code from disk.
}
else if (strcmp(arg1,"--int")==0)
{
if(strcmp(intType,"timer")==0)
{
deleteTimerFromDisk(); //removes Timer interrupt routine from disk.
}
else
{
int intNo = atoi(intType);
if(intNo >=1 && intNo <= NO_OF_INTERRUPTS)
deleteIntCode(intNo); //removes Int Code from disk.
else
{
printf("Invalid argument for \"--int=\" \n");
return;
}
}
}
else if (strcmp(arg1,"--exhandler")==0)
{
deleteExHandlerFromDisk(); //removes exception handler routine from disk.
}
else
printf("Invalid argument \"%s\" for rm. See \"help\" for more information\n",arg1);
}
else if (strcmp(name,"ls")==0) //Lists all files.
listAllFiles();
else if (strcmp(name,"df")==0) //Lists disk free list
displayDiskFreeList();
else if (strcmp(name,"cat")==0) //Displays contents of a file
{
arg1 = strtok(NULL, " ");
char *fileName = arg1;;
if(fileName!=NULL)
{
//fileName[WORD_SIZE+1] = '\n';
displayFileContents(fileName);
}
else
{
printf("Missing <xfs_filename> for cat. See \"help\" for more information\n");
return;
}
}
else if (strcmp(name,"copy")==0) //Copies blocks from Disk to UNIX file.
{
arg1 = strtok(NULL, " ");
arg2 = strtok(NULL, " ");
arg3 = strtok(NULL, " ");
if(arg1==NULL || arg2==NULL|| arg3==NULL)
{
printf("Insufficient arguments for \"copy\". See \"help\" for more information\n");
return;
}
else
{
int startBlock = atoi(arg1);
int endBlock = atoi(arg2);
char *fileName = arg3;
fileName[50] = '\0';
copyBlocksToFile (startBlock,endBlock,fileName);
}
}
else if (strcmp(name,"exit")==0) //Exits the interface
exit(0);
else
printf("Unknown command \"%s\". See \"help\" for more information\n",name);
}