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SysLib.java
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SysLib.java
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// Edited By Chris Knakal and Hyungjin Lee
// CSS 430 Program 5
// 5/30/2016
import java.util.*;
public class SysLib {
//------------------------------------------------------------------------------------------------------------------
// formats disk
// files specify the maximum number of files to be created
public static int format(int fileCount)
{
return Kernel.interrupt(Kernel.INTERRUPT_SOFTWARE, Kernel.FORMAT, fileCount, null);
}
// open file with fileName in given mode
public static int open(String fileName, String mode)
{
String[] args = new String[]{fileName, mode};
return Kernel.interrupt(Kernel.INTERRUPT_SOFTWARE, Kernel.OPEN, 0, args);
}
// close file corresponding to fd
public static int close(int fd)
{
return Kernel.interrupt(Kernel.INTERRUPT_SOFTWARE, Kernel.CLOSE, fd, null);
}
// reads up to buffer.length bytes from file indicated by fd
public static int read(int fd, byte[] buffer)
{
return Kernel.interrupt(Kernel.INTERRUPT_SOFTWARE, Kernel.READ, fd, buffer);
}
// writes contents of buffer to the file indicated by fd
public static int write(int fd, byte[] buffer)
{
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE, Kernel.WRITE, fd, buffer );
}
// updates seek pointer corresponding to fd
public static int seek(int fd, int offset, int whence)
{
int[] args = new int[]{offset, whence};
return Kernel.interrupt(Kernel.INTERRUPT_SOFTWARE, Kernel.SEEK, fd, args);
}
// destroys file specified by fileName
public static int delete(String fileName)
{
return Kernel.interrupt(Kernel.INTERRUPT_SOFTWARE, Kernel.DELETE, 0, fileName);
}
// returns size in bytes of the file indicated by fd
public static int fsize(int fd)
{
return Kernel.interrupt(Kernel.INTERRUPT_SOFTWARE, Kernel.SIZE, fd, null);
}
//------------------------------------------------------------------------------------------------------------------
public static int exec( String args[] ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.EXEC, 0, args );
}
public static int join( ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.WAIT, 0, null );
}
public static int boot( ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.BOOT, 0, null );
}
public static int exit( ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.EXIT, 0, null );
}
public static int sleep( int milliseconds ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.SLEEP, milliseconds, null );
}
public static int disk( int type ) {
return Kernel.interrupt( Kernel.INTERRUPT_DISK,
type, 0, null );
}
public static int cin( StringBuffer s ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.READ, 0, s );
}
public static int cout( String s ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.WRITE, 1, s );
}
public static int cerr( String s ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.WRITE, 2, s );
}
public static int rawread( int blkNumber, byte[] b ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.RAWREAD, blkNumber, b );
}
public static int rawwrite( int blkNumber, byte[] b ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.RAWWRITE, blkNumber, b );
}
public static int sync( ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.SYNC, 0, null );
}
public static int cread( int blkNumber, byte[] b ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.CREAD, blkNumber, b );
}
public static int cwrite( int blkNumber, byte[] b ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.CWRITE, blkNumber, b );
}
public static int flush( ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.CFLUSH, 0, null );
}
public static int csync( ) {
return Kernel.interrupt( Kernel.INTERRUPT_SOFTWARE,
Kernel.CSYNC, 0, null );
}
public static String[] stringToArgs( String s ) {
StringTokenizer token = new StringTokenizer( s," " );
String[] progArgs = new String[ token.countTokens( ) ];
for ( int i = 0; token.hasMoreTokens( ); i++ ) {
progArgs[i] = token.nextToken( );
}
return progArgs;
}
public static void short2bytes( short s, byte[] b, int offset ) {
b[offset] = (byte)( s >> 8 );
b[offset + 1] = (byte)s;
}
public static short bytes2short( byte[] b, int offset ) {
short s = 0;
s += b[offset] & 0xff;
s <<= 8;
s += b[offset + 1] & 0xff;
return s;
}
public static void int2bytes( int i, byte[] b, int offset ) {
b[offset] = (byte)( i >> 24 );
b[offset + 1] = (byte)( i >> 16 );
b[offset + 2] = (byte)( i >> 8 );
b[offset + 3] = (byte)i;
}
public static int bytes2int( byte[] b, int offset ) {
int n = ((b[offset] & 0xff) << 24) + ((b[offset+1] & 0xff) << 16) +
((b[offset+2] & 0xff) << 8) + (b[offset+3] & 0xff);
return n;
}
}