1 files changed, 4 insertions, 93 deletions
diff --git a/aoc-2025/day4.asm b/aoc-2025/day4.asm
index 57867b1..60e53ec 100644
--- a/aoc-2025/day4.asm
+++ b/aoc-2025/day4.asm
@@ -5,14 +5,7 @@ default rel
 
 global _start
 
-%define SYS_EXIT   60
-%define SYS_READ   0
-%define SYS_WRITE  1
-%define SYS_OPEN   2
-%define SYS_CLOSE  3
-
-%define O_RDONLY   0
-%define STDOUT     1
+%include "utils/io.asm"
 
 %define RAW_SIZE   4194304  ; 4 MiB scratch for the raw file
 %define GRID_SIZE  4194304  ; 4 MiB for the padded grid / mark buffers
@@ -20,8 +13,6 @@ global _start
 section .data
     input_path db "input/day4.txt", 0
 
-    newline    db 10
-
     label1     db "Part 1: ", 0
     label2     db "Part 2: ", 0
 
@@ -38,37 +29,14 @@ section .bss
     part1         resq 1
     part2         resq 1
 
-    number_buffer resb 32  ; for printing
-
 section .text
 
 _start:
-    mov     rax, SYS_OPEN
     mov     rdi, input_path
-    mov     rsi, O_RDONLY
-    xor     rdx, rdx
-    syscall
-    mov     r12, rax  ; fd
-
-    xor     r13, r13  ; bytes read so far
-read_loop:
-    mov     rax, SYS_READ
-    mov     rdi, r12
-    lea     rsi, [raw + r13]
+    lea     rsi, [raw]
     mov     rdx, RAW_SIZE
-    sub     rdx, r13  ; remaining capacity
-    syscall
-
-    cmp     rax, 0
-    jle     read_done
-    add     r13, rax
-    jmp     read_loop
-read_done:
-    mov     [raw_len], r13
-
-    mov     rax, SYS_CLOSE
-    mov     rdi, r12
-    syscall
+    call    read_file
+    mov     [raw_len], rax
 
     xor     rcx, rcx  ; column scanner
 width_scan:
@@ -266,60 +234,3 @@ count_neighbors:
     movzx   r8d, byte [grid + rdx + 1]
     add     eax, r8d
     ret
-
-print_newline:
-    mov     rax, SYS_WRITE
-    mov     rdi, STDOUT
-    mov     rsi, newline
-    mov     rdx, 1
-    syscall
-    ret
-
-print_int64:
-    mov     rdi, number_buffer+31
-    mov     byte [rdi], 0
-    dec     rdi
-
-    cmp     rax, 0
-    jne     .conv
-
-    mov     byte [rdi], '0'
-    jmp     .done
-.conv:
-    mov     rbx, 10
-.next:
-    xor     rdx, rdx
-    div     rbx
-    add     dl, '0'
-    mov     [rdi], dl
-    dec     rdi
-    test    rax, rax
-    jnz     .next
-
-    inc     rdi
-.done:
-    mov     rax, SYS_WRITE
-    mov     rsi, rdi
-    mov     rdi, STDOUT
-    mov     rdx, number_buffer+31
-    sub     rdx, rsi
-    syscall
-    ret
-
-print_string:
-    push    rcx
-    push    rdx
-    mov     rdx, 0
-.length:
-    cmp     byte [rcx+rdx], 0
-    je      .submit
-    inc     rdx
-    jmp     .length
-.submit:
-    mov     rax, SYS_WRITE
-    mov     rdi, STDOUT
-    mov     rsi, rcx
-    syscall
-    pop     rdx
-    pop     rcx
-    ret