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section .bss
input_buffer resb 1
section .text
global input
extern direction
extern exit
input:
call read_input
call handle_input
ret
handle_input:
mov al, byte [input_buffer]
cmp al, 'w'
je _input_up
cmp al, 's'
je _input_down
cmp al, 'a'
je _input_left
cmp al, 'd'
je _input_right
cmp al, 27 ; escape
je exit
ret
_input_up:
mov byte [direction], 3
ret
_input_down:
mov byte [direction], 1
ret
_input_left:
mov byte [direction], 2
ret
_input_right:
mov byte [direction], 0
ret
read_input:
mov rax, 0
mov rdi, 0
mov rsi, input_buffer
mov rdx, 250
syscall
ret
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