Created
April 11, 2012 23:30
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random dcpu16 stuff
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set a, data | |
jsr strlen | |
set b, a | |
set a, data | |
jsr reverse | |
jsr print | |
set PC, end | |
; reverse the string in place at [a], of len b | |
:reverse | |
set PUSH, a | |
sub b, 1; len - 1 | |
set i, 0; start | |
set a, POP | |
:doreverse | |
ifg i, b | |
set PC, POP | |
set x, a | |
add x, i | |
set y, a | |
add y, b | |
set c, [x] | |
set [x], [y] | |
set [y], c | |
add i, 1 | |
sub b, 1 | |
set PC, doreverse | |
:strlen | |
set i, 0 | |
:docount | |
ife [a], 0x0 | |
set PC, countend | |
add i, 1 | |
add a, 1 | |
set PC, docount | |
:countend | |
set a, i | |
set PC, POP | |
; print the string at [a] ending with 0x0 | |
set PUSH, a | |
set i, 0 | |
:doprint | |
ife [a], 0x0 | |
set PC, printend | |
set [0x8000+i], [a] | |
add i, 1 | |
add a, 1 | |
set PC, doprint | |
:printend | |
set a, POP | |
set PC, POP | |
:end | |
set PC, end | |
:data | |
dat "Hello world" | |
:itoa | |
set j, 0 ;index | |
set z, 48 | |
set i, a | |
mod i, 10 | |
div a, 10 | |
add z, i | |
set [0x1000+j], z | |
add j, 1 | |
set z, 48 | |
ifg a, 0 | |
sub PC, 11 | |
set [0x1000+j], 0x0 | |
set PC, POP |
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