Package mars.mips.instructions.syscalls

Class SyscallReadString

java.lang.Object

mars.mips.instructions.syscalls.AbstractSyscall

mars.mips.instructions.syscalls.SyscallReadString

All Implemented Interfaces:

Syscall

public class SyscallReadString
extends AbstractSyscall

Service to read console input string into buffer starting at address in $a0.

Constructor Summary

Constructors

Constructor	Description
SyscallReadString()	Build an instance of the Read String syscall.

Method Summary

Modifier and Type	Method	Description
void	simulate(ProgramStatement statement)	Performs syscall function to read console input string into buffer starting at address in $a0.

Methods inherited from class mars.mips.instructions.syscalls.AbstractSyscall

getName, getNumber, setNumber

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SyscallReadString

public SyscallReadString()

Build an instance of the Read String syscall. Default service number is 8 and name is "ReadString".

Method Details

simulate

public void simulate(ProgramStatement statement)
              throws ProcessingException

Performs syscall function to read console input string into buffer starting at address in $a0. Follows semantics of UNIX 'fgets'. For specified length n, string can be no longer than n-1. If less than that, add newline to end. In either case, then pad with null byte.

Specified by:

simulate in interface Syscall

Specified by:

simulate in class AbstractSyscall

Parameters:

statement - ProgramStatement object for this syscall instruction.

Throws:

ProcessingException