Day 1

1 files changed, 72 insertions, 0 deletions

diff --git a/day01.asm b/day01.asm
new file mode 100644
index 0000000..725c9b2
--- /dev/null
+++ b/day01.asm
@@ -0,0 +1,72 @@
+%include "sys.asm"
+global _start
+
+section .bss
+input: resb 1
+
+section .data
+position:
+  .x: dd 0
+  .y: dd 0
+direction:
+  .x: dd 0
+  .y: dd -1
+
+section .text
+_start:
+  .loopTurn:
+    syscall SYS_READ, FD_STDIN, input, 1
+    test rax, rax
+    jz .breakTurn
+
+    cmp byte [input], 'R'
+    jne .elseLeft
+    .thenRight:
+      rol qword [direction], 32
+      neg dword [direction.x]
+      jmp .endLeft
+    .elseLeft:
+      neg dword [direction.x]
+      rol qword [direction], 32
+    .endLeft:
+
+    xor r12, r12
+    .loopDigit:
+      syscall SYS_READ, FD_STDIN, input, 1
+      test rax, rax
+      jz .breakDigit
+      movzx rax, byte [input]
+
+      cmp al, ','
+      je .breakDigit
+
+      shl r12, 1
+      lea r12, [r12 + r12 * 4 - '0']
+      add r12, rax
+    jmp .loopDigit
+    .breakDigit:
+
+    syscall SYS_READ, FD_STDIN, input, 1
+
+    mov eax, r12d
+    imul eax, [direction.x]
+    add [position.x], eax
+    imul r12d, [direction.y]
+    add [position.y], r12d
+  jmp .loopTurn
+  .breakTurn:
+
+  mov eax, [position.x]
+  sar eax, 31
+  mov ecx, eax
+  xor ecx, [position.x]
+  sub ecx, eax
+
+  mov eax, [position.y]
+  sar eax, 31
+  mov edx, eax
+  xor edx, [position.y]
+  sub edx, eax
+
+  add ecx, edx
+syscall SYS_EXIT, rcx