[solve]: day1 part 1

5 files changed, 4981 insertions, 9 deletions

diff --git a/.gitignore b/.gitignore
index e660fd9..378eac2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-bin/
+build
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5ca8b92
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,38 @@
+NASM ?= nasm
+LD ?= ld
+
+SRC_DIR := src
+BUILD_DIR := build
+
+NASMFLAGS ?= -f elf32 -g -F dwarf
+LDFLAGS ?= -m elf_i386
+
+DAYS := Day1 Day2 Day3 Day4
+ASM_SRCS := $(addprefix $(SRC_DIR)/,$(addsuffix .asm,$(DAYS)))
+OBJ_FILES := $(addprefix $(BUILD_DIR)/,$(addsuffix .o,$(DAYS)))
+BINARIES := $(addprefix $(BUILD_DIR)/,$(DAYS))
+
+.PHONY: all clean day1 list run-day%
+
+all: $(BINARIES)
+
+$(BUILD_DIR):
+	@mkdir -p $(BUILD_DIR)
+
+$(BUILD_DIR)/Day%.o: $(SRC_DIR)/Day%.asm | $(BUILD_DIR)
+	$(NASM) $(NASMFLAGS) $< -o $@
+
+$(BUILD_DIR)/Day%: $(BUILD_DIR)/Day%.o
+	$(LD) $(LDFLAGS) -o $@ $<
+
+day1: $(BUILD_DIR)/Day1
+
+run-day%: $(BUILD_DIR)/Day%
+	./$(BUILD_DIR)/Day$*
+
+list:
+	@printf "Available days:\n"
+	@for day in $(DAYS); do echo "  $$day"; done
+
+clean:
+	rm -rf $(BUILD_DIR)
diff --git a/input/day1.txt b/input/day1.txt
new file mode 100644
index 0000000..b8cc155
--- /dev/null
+++ b/input/day1.txt
@@ -0,0 +1,4664 @@
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diff --git a/input/test-day1.txt b/input/test-day1.txt
new file mode 100644
index 0000000..53287c7
--- /dev/null
+++ b/input/test-day1.txt
@@ -0,0 +1,10 @@
+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82
diff --git a/src/Day1.asm b/src/Day1.asm
index 6203572..ba5eb57 100644
--- a/src/Day1.asm
+++ b/src/Day1.asm
@@ -1,22 +1,282 @@
-; Advent of Code 2025 - Day 1
+; Advent of Code 2025 - Day 1.1
+
+; #include <stddef.h>
+; #include <stdio.h>
+; #include <stdlib.h>
+; #include <stdint.h>
+;
+; int main(void)
+; {
+;     FILE* input = fopen("input/day1.txt", "r");
+;
+;     int32_t angle = 50;
+;     int32_t password = 0;
+;
+;     char line[256];
+;     while (fgets(line, sizeof(line), input))
+;     {
+;         int32_t direction = (line[0] == 'L') ? -1 : 1;
+;         int32_t steps = atoi(line + 1);
+;
+;         angle += direction * steps;
+;         angle = (angle % 100 + 100) % 100;
+;
+;         if (angle == 0)
+;             password++;
+;     }
+;
+;     fclose(input);
+;     printf("Password: %d\n", password);
+; }
 
 global _start
 
-%define SYS_EXIT  1
-%define SYS_WRITE 4
+%define SYS_EXIT   1
+%define SYS_READ   3
+%define SYS_WRITE  4
+%define SYS_OPEN   5
+%define SYS_CLOSE  6
+
+%define O_RDONLY   0
+%define STDOUT     1
 
 section .data
-    message: db "Hello World!", 0xA
-    messageLen: equ $-message
+    inputPath db "input/day1.txt", 0
+    newline   db 10                ; '\n'
+
+    angle    dd 50                 ; initial angle
+    password dd 0                  ; result counter
+
+section .bss
+    buffer       resb 4096         ; chunk read buffer
+    lineBuffer   resb 256          ; one line max 255 chars + NUL
+    numberBuffer resb 16           ; for PrintInt
+    lineLen      resd 1            ; current line length
 
 section .text
+
 _start:
+    ; open file
+    mov eax, SYS_OPEN
+    mov ebx, inputPath
+    mov ecx, O_RDONLY
+    int 0x80
+
+    mov esi, eax           ; fd in ESI
+    mov dword [lineLen], 0 ; no chars in current line yet
+
+ReadLoop:
+    ; read up to 4096 bytes
+    mov eax, SYS_READ
+    mov ebx, esi
+    mov ecx, buffer
+    mov edx, 4096
+    int 0x80
+
+    cmp eax, 0
+    jle EOF         ; 0 or negative = EOF or error
+
+    mov edi, buffer ; scan pointer
+    mov ecx, eax    ; bytes remaining in this chunk
+
+ScanChunk:
+    cmp ecx, 0
+    je ReadLoop   ; chunk done, read next
+
+    mov al, [edi]
+
+    ; windows can be a fucking bitch
+    ; handle CR (13) -> just skip
+    cmp al, 13
+    je SkipCR
+
+    ; handle LF (10) -> end of line
+    cmp al, 10
+    je EndOfLine
+
+    ; normal character: append to lineBuffer if space left
+    mov edx, [lineLen]
+    cmp edx, 255  ; leave 1 byte for NUL
+    jae SkipStore ; ignore extra chars if too long
+    mov [lineBuffer + edx], al
+    inc edx
+    mov [lineLen], edx
+
+SkipStore:
+    inc edi
+    dec ecx
+    jmp ScanChunk
+
+SkipCR:
+    inc edi
+    dec ecx
+    jmp ScanChunk
+
+EndOfLine:
+    ; terminate current line
+    mov edx, [lineLen]
+    mov byte [lineBuffer + edx], 0
+
+    ; if line isn't empty, process it
+    cmp edx, 0
+    je LineDone
+
+    push esi
+    mov esi, lineBuffer
+    call HandleLine
+    pop esi
+
+LineDone:
+    mov dword [lineLen], 0 ; reset line length
+    inc edi
+    dec ecx
+    jmp ScanChunk
+
+; process last line if not newline-terminated, then print result
+EOF:
+    ; if there is a partial line at EOF, process it
+    mov edx, [lineLen]
+    cmp edx, 0
+    jle FinishEOF
+    mov byte [lineBuffer + edx], 0
+
+    push esi
+    mov esi, lineBuffer
+    call HandleLine
+    pop esi
+
+FinishEOF:
+    mov eax, [password]
+    call PrintInt
+
+    ; newline after result
     mov eax, SYS_WRITE
-    mov ebx, 1
-    mov ecx, message
-    mov edx, messageLen
+    mov ebx, STDOUT
+    mov ecx, newline
+    mov edx, 1
+    int 0x80
+
+    ; close file and exit
+    mov eax, SYS_CLOSE
+    mov ebx, esi
     int 0x80
 
     mov eax, SYS_EXIT
     xor ebx, ebx
     int 0x80
+
+
+; Handle one line: ESI -> "L123" or "R45"
+HandleLine:
+    mov al, [esi]
+    cmp al, 'L'
+    je .left
+    mov ebx, 1    ; direction = +1 for 'R' or anything else
+    jmp .after
+.left:
+    mov ebx, -1   ; direction = -1 for 'L'
+.after:
+    inc esi       ; skip 'L' or 'R'
+    call ParseInt ; EAX = steps
+
+    imul eax, ebx ; EAX = dir * steps
+
+    mov edx, [angle]
+    add edx, eax  ; update angle (can be out of range, signed)
+
+    ; normalize edx into [0, 100[ using repeated +/-100 (no division)
+NormLoop:
+    cmp edx, 0
+    jl NormAdd
+    cmp edx, 100
+    jl NormDone
+    sub edx, 100
+    jmp NormLoop
+
+NormAdd:
+    add edx, 100
+    jmp NormLoop
+
+NormDone:
+    mov [angle], edx
+
+    cmp edx, 0
+    jne .done
+    mov eax, [password]
+    inc eax
+    mov [password], eax
+.done:
+    ret
+
+; ParseInt: - parse decimal number at [ESI] into EAX
+;           - stops at first non-digit
+ParseInt:
+    xor eax, eax      ; result = 0
+
+.parseLoop:
+    mov dl, [esi]
+    cmp dl, '0'
+    jl .done
+    cmp dl, '9'
+    jg .done
+
+    sub dl, '0'       ; digit value 0..9
+    movzx edx, dl
+
+    imul eax, eax, 10 ; result *= 10
+    add eax, edx      ; result += digit
+
+    inc esi
+    jmp .parseLoop
+
+.done:
+    ret
+
+; PrintInt: print unsigned integer in EAX to stdout
+PrintInt:
+    mov edi, numberBuffer+15   ; write digits from the end
+    mov byte [edi], 0          ; terminator
+    dec edi
+
+    cmp eax, 0
+    jne .convert
+    mov byte [edi], '0'
+    jmp .finish
+
+.convert:
+    ; we will repeatedly compute:
+    ;   q = eax / 10
+    ;   r = eax % 10
+    ; using only subtraction
+.nextDigit:
+    mov edx, eax               ; tmp = current value
+    mov ecx, 0                 ; q = 0
+
+    cmp edx, 10
+    jb .lastDigit             ; if < 10, quotient = 0, remainder = edx
+.subLoop:
+    sub edx, 10
+    inc ecx                    ; q++
+    cmp edx, 10
+    jae .subLoop              ; while tmp >= 10
+.lastDigit:
+    ; now:
+    ;   ecx = quotient
+    ;   edx = remainder (0..9)
+    add dl, '0'
+    mov [edi], dl              ; store digit
+    dec edi
+
+    mov eax, ecx               ; eax = quotient
+    test eax, eax
+    jnz .nextDigit            ; more digits to extract?
+
+    inc edi                    ; move to first digit
+.finish:
+    mov eax, SYS_WRITE
+    mov ebx, STDOUT
+    mov ecx, edi
+    mov edx, numberBuffer+15
+    sub edx, edi               ; length
+    int 0x80
+    ret