diff options
Diffstat (limited to 'aoc-2025/day1.asm')
| -rw-r--r-- | aoc-2025/day1.asm | 178 |
1 files changed, 89 insertions, 89 deletions
diff --git a/aoc-2025/day1.asm b/aoc-2025/day1.asm index 8ba8f0e..f130675 100644 --- a/aoc-2025/day1.asm +++ b/aoc-2025/day1.asm @@ -15,7 +15,7 @@ global _start %define STDOUT 1
section .data
- inputPath db "input/day1.txt", 0
+ input_path db "input/day1.txt", 0
newline db 10
label1 db "Password 1: ", 0
@@ -29,24 +29,24 @@ section .data section .bss
buffer resb 4096
- lineBuffer resb 256
- numberBuffer resb 16
- lineLen resd 1
+ line_buffer resb 256
+ number_buffer resb 16
+ line_len resd 1
section .text
_start:
; open file
mov rax, SYS_OPEN
- mov rdi, inputPath
+ mov rdi, input_path
mov rsi, O_RDONLY
xor rdx, rdx
syscall
- mov r12, rax ; fd in R12
- mov dword [lineLen], 0 ; no chars in current line yet
+ mov r12, rax ; fd in R12
+ mov dword [line_len], 0 ; no chars in current line yet
-ReadLoop:
+read_loop:
; read up to 4096 bytes
mov rax, SYS_READ
mov rdi, r12
@@ -55,80 +55,80 @@ ReadLoop: syscall
cmp rax, 0
- jle EOF ; <=0 -> EOF or error
+ jle eof ; <=0 -> EOF or error
- mov rdi, buffer ; scan pointer
- mov rbp, rax ; bytes remaining in this chunk
+ mov rdi, buffer ; scan pointer
+ mov rbp, rax ; bytes remaining in this chunk
-ScanChunk:
+scan_chunk:
cmp rbp, 0
- je ReadLoop ; chunk done, read next
+ je read_loop ; chunk done, read next
mov al, [rdi]
; windows can be a fucking bitch
; handle (CR) -> just skip
cmp al, 13
- je SkipCR
+ je skip_cr
; handle LF (10) -> end of line
cmp al, 10
- je EndOfLine
+ je end_of_line
- ; normal character -> append to lineBuffer if space left
- mov edx, [lineLen]
- cmp edx, 255 ; leave 1 byte for NULL
- jae SkipStore ; ignore extra characters if too long
- mov [lineBuffer+rdx], al
+ ; normal character -> append to line_buffer if space left
+ mov edx, [line_len]
+ cmp edx, 255 ; leave 1 byte for NULL
+ jae skip_store ; ignore extra characters if too long
+ mov [line_buffer+rdx], al
inc edx
- mov [lineLen], edx
+ mov [line_len], edx
-SkipStore:
+skip_store:
inc rdi
dec rbp
- jmp ScanChunk
+ jmp scan_chunk
-SkipCR:
+skip_cr:
inc rdi
dec rbp
- jmp ScanChunk
+ jmp scan_chunk
-EndOfLine:
+end_of_line:
; terminate current line
- mov edx, [lineLen]
- mov byte [lineBuffer+rdx], 0
+ mov edx, [line_len]
+ mov byte [line_buffer+rdx], 0
; if line isn't empty, process it
cmp edx, 0
- je LineDone
+ je line_done
push rdi
- mov rsi, lineBuffer
- call HandleLine
+ mov rsi, line_buffer
+ call handle_line
pop rdi
-LineDone:
- mov dword [lineLen], 0 ; reset line length
+line_done:
+ mov dword [line_len], 0 ; reset line length
inc rdi
dec rbp
- jmp ScanChunk
+ jmp scan_chunk
; process last line if not newline-terminated, then print result
-EOF:
+eof:
; if there is a partial line at EOF, process it
- mov edx, [lineLen]
+ mov edx, [line_len]
cmp edx, 0
- jle PrintResults
- mov byte [lineBuffer+rdx], 0
+ jle print_results
+ mov byte [line_buffer+rdx], 0
- mov rsi, lineBuffer
- call HandleLine
+ mov rsi, line_buffer
+ call handle_line
-PrintResults:
+print_results:
mov rcx, label1
- call PrintString
+ call print_string
mov eax, [password1]
- call PrintInt
+ call print_int
; newline
mov rax, SYS_WRITE
@@ -138,9 +138,9 @@ PrintResults: syscall
mov rcx, label2
- call PrintString
+ call print_string
mov eax, [password2]
- call PrintInt
+ call print_int
; new linhe
mov rax, SYS_WRITE
@@ -157,67 +157,67 @@ PrintResults: syscall
; Handle one line: RSI -> "L123" or "R45"
-HandleLine:
+handle_line:
mov al, [rsi]
cmp al, 'L'
je .left
- mov ebx, 1 ; direction = +1 for 'R' or anything else
+ mov ebx, 1 ; direction = +1 for 'R' or anything else
jmp .after
.left:
mov ebx, -1 ; direction = -1 for 'L'
.after:
- inc rsi ; skip 'L' or 'R'
- call ParseInt ; EAX = steps
+ inc rsi ; skip 'L' or 'R'
+ call parse_int ; EAX = steps
mov ecx, eax
; Part 1
-P1_Start:
+p1_start:
mov eax, ecx
imul eax, ebx
add eax, [angle1]
- call NormalizeAngle
+ call normalize_angle
mov [angle1], eax
cmp eax, 0
- jne P2_Start
+ jne p2_start
mov rdi, password1
mov edx, [rdi]
inc edx
mov [rdi], edx
; Part 2
-P2_Start:
+p2_start:
mov rdi, password2
.loop:
test ecx, ecx
- jle P2_Exit
+ jle p2_exit
dec ecx
mov eax, [angle2]
- call UpdateAngleCount
+ call update_angle_count
mov [angle2], eax
jmp .loop
-P2_Exit:
+p2_exit:
ret
; normalize eax to 0..99
-NormalizeAngle:
+normalize_angle:
cmp eax, 0
jl .add
cmp eax, 100
jl .done
sub eax, 100
- jmp NormalizeAngle
+ jmp normalize_angle
.add:
add eax, 100
- jmp NormalizeAngle
+ jmp normalize_angle
.done:
ret
; eax = angle, ebx = direction, rdi = password counter addr
-UpdateAngleCount:
+update_angle_count:
add eax, ebx
- call NormalizeAngle
+ call normalize_angle
cmp eax, 0
jne .done
@@ -228,29 +228,29 @@ UpdateAngleCount: ret
; parse ASCII integer into EAX
-ParseInt:
- xor eax, eax ; result = 0
-.parseLoop:
+parse_int:
+ xor eax, eax ; result = 0
+.parse_loop:
mov dl, [rsi]
cmp dl, '0'
jl .done
cmp dl, '9'
jg .done
- sub dl, '0' ; digit value 0..9
+ sub dl, '0' ; digit value 0..9
movzx edx, dl
- imul eax, eax, 10 ; result *= 10
- add eax, edx ; result += digit
+ imul eax, eax, 10 ; result *= 10
+ add eax, edx ; result += digit
inc rsi
- jmp .parseLoop
+ jmp .parse_loop
.done:
ret
-PrintInt:
- mov edi, numberBuffer+15 ; write digits from the end
- mov byte [rdi], 0 ; terminator
+print_int:
+ mov edi, number_buffer+15 ; write digits from the end
+ mov byte [rdi], 0 ; terminator
dec rdi
cmp eax, 0
@@ -262,48 +262,48 @@ PrintInt: ; q = eax / 10
; r = eax % 10
; using only subtraction
-.nextDigit:
- mov edx, eax ; tmp = current value
- mov ecx, 0 ; q = 0
+.next_digit:
+ mov edx, eax ; tmp = current value
+ mov ecx, 0 ; q = 0
- cmp edx, 10 ; if < 0, q=0, r=edx
- jb .lastDigit
-.subLoop:
+ cmp edx, 10 ; if < 0, q=0, r=edx
+ jb .last_digit
+.sub_loop:
sub edx, 10
- inc ecx ; q++
+ inc ecx ; q++
cmp edx, 10
- jae .subLoop ; while tmp >= 10
-.lastDigit:
+ jae .sub_loop ; while tmp >= 10
+.last_digit:
; now:
; ecx = quotient
; edx = remainder (0..9)
add dl, '0'
mov [rdi], dl ; store digit
dec rdi
- mov eax, ecx ; eax = quotient
+ mov eax, ecx ; eax = quotient
test eax, eax
- jnz .nextDigit ; more digits to extract?
+ jnz .next_digit ; more digits to extract?
- inc rdi ; move to first digit
+ inc rdi ; move to first digit
.finish:
mov rax, SYS_WRITE
- mov rsi, rdi ; buffer pointer
+ mov rsi, rdi ; buffer pointer
mov rdi, STDOUT
- mov rdx, numberBuffer+15
- sub rdx, rsi ; length
+ mov rdx, number_buffer+15
+ sub rdx, rsi ; length
syscall
ret
-PrintString:
+print_string:
push rcx
push rdx
mov rdx, 0
.count:
cmp byte [rcx+rdx], 0
- je .doneCount
+ je .done_count
inc rdx
jmp .count
-.doneCount:
+.done_count:
mov rax, SYS_WRITE
mov rdi, STDOUT
mov rsi, rcx
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