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day 18 part 1

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Lucia Ceionia 2023-12-18 12:51:44 -06:00
parent 3362719e79
commit 5db47a3fcc
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18/Makefile Normal file
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all:
nasm -g -felf32 main.s && ld -melf_i386 -g main.o

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L 10 (#1e28f2)
U 9 (#09d973)

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18/input_test Normal file
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R 6 (#70c710)
D 5 (#0dc571)
L 2 (#5713f0)
D 2 (#d2c081)
R 2 (#59c680)
D 2 (#411b91)
L 5 (#8ceee2)
U 2 (#caa173)
L 1 (#1b58a2)
U 2 (#caa171)
R 2 (#7807d2)
U 3 (#a77fa3)
L 2 (#015232)
U 2 (#7a21e3)

149
18/main.s Normal file
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@ -0,0 +1,149 @@
%include "utils.s"
global _start
[bits 32]
[section .text]
%define FILENAME "input"
;%define FILENAME "input_test"
;%define PRINT
_start:
mov esi, file
mov edi, array+1024*512+512 ; like, the middle idk
mov byte [edi], 1 ; filled!
proc_line:
cmp esi, file.over
jae .done
lodsb ; RDLU
%ifdef PRINT
call print_char
call space
%endif
mov ebx, eax
inc esi ; space
call dec_parse ; count
%ifdef PRINT
call print_dec
call newline
%endif
; skip to next line
add esi, 10
; put in array
cmp bl, 'R'
mov ecx, 1
cmove edx, ecx
cmp bl, 'L'
mov ecx, -1
cmove edx, ecx
cmp bl, 'D'
mov ecx, 1024
cmove edx, ecx
cmp bl, 'U'
mov ecx, -1024
cmove edx, ecx
mov ecx, eax
.draw:
add edi, edx
mov byte [edi], 1
loop .draw
jmp proc_line
.done:
%ifdef PRINT
print_array:
call newline
mov esi, array
xor ecx, ecx
.inner:
mov bl, '.'
lodsb
test al, al
mov dl, '#'
cmovnz bx, dx
mov al, bl
call print_char
inc ecx
cmp ecx, 1024*1024
jae .done
mov ebx, ecx
and ebx, 1023
jnz .inner
call newline
jmp .inner
.done:
call newline
%endif
xor ecx, ecx ; x = 0
xor ebx, ebx ; y = 0
mov ebp, 1024*1024 ; count
call flood_fill
jmp flood_done
flood_fill:
mov eax, ebx
shl eax, 10
cmp byte [array+eax+ecx], 0
je .zero
ret
.zero:
dec ebp
mov byte [array+eax+ecx], 1
sub esp, 8
mov [esp+4], ecx
mov [esp+0], ebx
.t_right:
cmp ecx, 1023
je .t_left
inc ecx
call flood_fill
mov ecx, [esp+4]
.t_left:
cmp ecx, 0
je .t_down
dec ecx
call flood_fill
mov ecx, [esp+4]
.t_down:
cmp ebx, 1023
je .t_up
inc ebx
call flood_fill
mov ebx, [esp+0]
.t_up:
cmp ebx, 0
je .ret
dec ebx
call flood_fill
mov ebx, [esp+0]
.ret:
add esp, 8
ret
flood_done:
mov [final_value], ebp
game_over:
mov eax, [final_value]
call print_dec
call newline
jmp exit
PANIC:
p_string panic_str
jmp exit
[section .data]
final_value: dd 0
file: incbin FILENAME
.over:
[section .bss]
array: resb 1024*1024
[section .rodata]
panic_str: db 10, "AAAAAAAAAAAAAAAAAAAAAA!!!!!!!!!!11111111", 10
.over:

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[bits 32]
[section .text]
; call # val val2
; int $0x80 eax eax edx -
;
; arg1 arg2 arg3 arg4 arg5 arg6 arg7
; ebx ecx edx esi edi ebp -
exit:
mov eax, 1 ; exit
int 0x80
; filename in EBX
; return handle in EBX
; read only
open_file:
push eax
push ecx
mov eax, 5 ; open
xor ecx, ecx ; read only
int 0x80
mov ebx, eax
pop ecx
pop eax
ret
; file handle in EBX
; buffer in ECX
; count of bytes to read in EDX
; return bytes actually read in EAX
; exits on error
read_file:
mov eax, 3 ; read
int 0x80
test eax, eax
js .err
ret
.err:
mov eax, 4 ; write
mov ebx, 1 ; stdout
mov ecx, .err_str
mov edx, 21
int 0x80
jmp exit
.err_str: db `Could not read file.\n`
; string input in ESI
; value in EAX
; CF set if none, clear if some
; ESI set past checked area
dec_parse:
push ebx
push edx
push edi
xor eax, eax
xor edi, edi
mov ebx, 10 ; base
lodsb
sub al, '0'
js .no_input
cmp al, 9
jle .got_char
.no_input:
stc ; set CF
jmp .done
.loop:
xor eax,eax
lodsb
sub al, '0'
js .dec_done
cmp al, 9
jg .dec_done
.got_char:
xchg edi,eax
mul ebx
add edi,eax
jmp .loop
.dec_done:
clc ; clear CF
.done:
mov eax,edi
pop edi
pop edx
pop ebx
ret
; string input in ESI
; value in EAX
; CF set if none, clear if some
; ESI set past checked area
sign_dec_parse:
push ebx
push ecx
push edx
push edi
xor eax, eax
xor edi, edi
xor ecx, ecx ; neg flag
mov ebx, 10 ; base
cmp byte [esi], '-'
jne .no_minus
inc esi
mov cl, 1
.no_minus:
lodsb
sub al, '0'
js .no_input
cmp al, 9
jle .got_char
.no_input:
stc ; set CF
jmp .done
.loop:
xor eax,eax
lodsb
sub al, '0'
js .dec_done
cmp al, 9
jg .dec_done
.got_char:
xchg edi,eax
mul ebx
add edi,eax
jmp .loop
.dec_done:
test ecx, ecx
jz .not_neg
neg edi
.not_neg:
clc ; clear CF
.done:
mov eax,edi
pop edi
pop edx
pop ecx
pop ebx
ret
; modifies no regs
newline:
pushad
push 10
mov eax, 4 ; write
mov ebx, 1 ; stdout
mov ecx, esp ; string
mov edx, 1 ; length
int 0x80
add esp, 4
popad
ret
; modifies no regs
space:
pushad
push 9
mov eax, 4 ; write
mov ebx, 1 ; stdout
mov ecx, esp ; string
mov edx, 1 ; length
int 0x80
add esp, 4
popad
ret
; input in EAX, all regs unmodified
print_dec:
pushad ; save regs
; max 4294967296 is 10 chars
; round to nearest 32-bit boundary
sub esp, 12
; string in ECX, length in EDX
lea ecx, [esp+11] ; last possible byte
; check for 0
test eax, eax
jz .zero
mov ebx, 10 ; base 10
xor esi, esi ; counter
.div_shit:
xor edx, edx
; divide
div ebx
dec ecx ; next char
inc esi
; store
add dl, '0'
mov byte [ecx], dl
; check if done
test eax, eax
jnz .div_shit ; continue
mov edx, esi ; counter in edx
jmp .write
.zero:
mov byte [ecx], '0'
mov edx, 1 ; length
.write:
mov eax, 4 ; write
mov ebx, 1 ; stdout
int 0x80
add esp, 12 ; restore stack
popad ; restore regs
ret
; input in EAX, all regs unmodified
print_sign_dec:
pushad ; save regs
; range -2147483648 to 2147483647 is 11 chars
; round to nearest 32-bit boundary
sub esp, 12
; string in ECX, length in EDX
lea ecx, [esp+11] ; last possible byte
; check for 0, negative
xor ebp, ebp
test eax, eax
jz .zero
jns .positive
neg eax
mov ebp, 1
.positive:
mov ebx, 10 ; base 10
xor esi, esi ; counter
.div_shit:
xor edx, edx
; divide
div ebx
dec ecx ; next char
inc esi
; store
add dl, '0'
mov byte [ecx], dl
; check if done
test eax, eax
jnz .div_shit ; continue
mov edx, esi ; counter in edx
jmp .write
.zero:
mov byte [ecx], '0'
mov edx, 1 ; length
.write:
test ebp, ebp
jz .no_minus
dec ecx
inc edx
mov byte [ecx], '-'
.no_minus:
mov eax, 4 ; write
mov ebx, 1 ; stdout
int 0x80
add esp, 12 ; restore stack
popad ; restore regs
ret
; input in ESI, len in ECX, all regs unmodified
print_string:
pushad ; save regs
mov eax, 4 ; write
mov ebx, 1 ; stdout
mov edx, ecx ; length
mov ecx, esi ; string
int 0x80
popad ; restore regs
ret
; input in AL, all regs unmodified
print_char:
pushad ; save regs
push eax
mov eax, 4 ; write
mov ebx, 1 ; stdout
mov edx, 1 ; length
mov ecx, esp ; string
int 0x80
add esp, 4
popad ; restore regs
ret
; --- MACROS ---
%define len(x) x %+ .over - x
%macro p_string 1
push esi
push ecx
mov esi, %1
mov ecx, len(%1)
call print_string
pop ecx
pop esi
%endmacro