File format:

The input file consists of assembler commands delimited by newline
characters.
Legal assembler commands are:

or REG, REG, REG
add REG, REG, REG
and REG, REG, REG
sub REG, REG, REG
lw REG, IMM
sw REG, IMM
lui REG, IMM
ori REG, IMM
j <LABEL|IMM>
beq <LABEL|IMM_LARGE>

Where REG is $0 or $1 (specifying register 0 or register 1)
IMM is an unsigned 4-bit immediate.
<LABEL|IMM_LARGE> is either a label or a 5-bit unsigned immediate.

Lines can also be labels, formatted as
Label_name:

(e.g. foo:)

To jump to a label, use:
j Label_name
(e.g. j foo)


Other notes:
-This program was originally written for personal use for Fall 2005's
project. Consequently error handling is limited (though present).
Formatting:
After your instruction there can be no white space between the last
character and the new line. (e.g. add $0, $0, $1<n> is good, but add $0,
$0, $1    <n> will not work).
-If you want to use hex values anywhere, proceed them with 0xnumber. You
can also use octal with 0number.
-You will receive a warning if your jump or beq is not reachable
(i.e. j over a 32 block or beq beyond +-16).  You will have to
manually resolve this problem.
-Comments are allowed, but they must take up the entire line.  That is
the first char of the line must be a '#' if you want a comment.

To use:
-compile with gcc.
-./*assembler* < input.asm > output.code

where input.asm is the *assembler* file and output.code will be the code
written.