/*
This function loads the OS startup code specified by the first arguement to its appropriate location on disk.
The code is first copied to memory copy. If this copying proceeds properly then the memory copy is committed to the disk.
*/
int loadOSCode(char* fileName){
emptyBlock(TEMP_BLOCK);
writeToDisk(TEMP_BLOCK,OS_STARTUP_CODE);
expandpath(fileName);
FILE* fp = fopen(fileName, "r");
int i,j;
if(fp == NULL)
{
printf("File \'%s\' not found.\n", fileName);
return -1;
}
for(i=0;i<OS_STARTUP_CODE_SIZE;i++)
{
j = writeFileToDisk(fp, OS_STARTUP_CODE + i, ASSEMBLY_CODE);
if (j != 1)
break;
}
if(j==1)
{
printf("OS Code exceeds %d block\n",OS_STARTUP_CODE_SIZE);
deleteOSCodeFromDisk();
//emptyBlock(TEMP_BLOCK);
//writeToDisk(TEMP_BLOCK,OS_STARTUP_CODE);
}
close(fp);
return 0;
}
/*
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);
}
