Read Input (up,right,down,left). Error: Segmentaion fault to fix...

src/main.asm

@@ -19,6 +19,10 @@ section .data
 
     user_location_pos db 0
 
+    user_input times 3 db 0
+    user_input_len equ $ - user_input
+
+
     newline db 0xA, 0
     newline_len equ $ - newline
 
@@ -59,8 +63,12 @@ print_loop:
     ;     call print_String
     ; }
     
-
-    cmp r10, [rel user_location]
+no_user_location:
+    ; Replace this:
+    ; cmp r10, byte [rel user_location_pos]
+    ; je has_user_location_pos
+    movzx rax, byte [rel user_location_pos]
+    cmp r10, rax
     je has_user_location_pos
 
     cmp byte [r11 + r10], 0
@@ -80,7 +88,7 @@ mine_tile:
     lea r8, [rel tile_mine]
     jmp print_tile
 
-_user_location:
+has_user_location_pos:
     lea r8, [rel user_location]
     jmp print_tile
 
@@ -88,8 +96,6 @@ print_tile:
     mov r9, tile_len
     call print_String
 
-no_user_location:
-
     ; Check if newline is needed (every 10th element)
     mov rax, r10
     xor rdx, rdx
@@ -108,7 +114,63 @@ no_newline:
 
     ; Print a cursor to show what tile the user is on
 
+    ; read user input, arrow keys 
+    ; if up arrow, decrement user_location_pos
+    ; if down arrow, increment user_location_pos
+    ; if left arrow, decrement user_location_pos
+    ; if right arrow, increment user_location_pos
 
+    ; Read user input
+    mov rax, 0x2000003            ; syscall: read
+    mov rdi, 0                    ; file descriptor: stdin
+    lea rsi, [rel user_input]     ; buffer to store input
+    mov rdx, 1                    ; number of bytes to read
+    syscall
+
+    ; Check the input and update user_location_pos accordingly
+    cmp byte [rel user_input], 0x1B   ; Escape sequence
+    jne no_escape
+
+    ; Read the next two bytes for arrow keys
+    mov rax, 0x2000003            ; syscall: read
+    mov rdi, 0                    ; file descriptor: stdin
+    lea rsi, [rel user_input + 1] ; buffer to store input
+    mov rdx, 2                    ; number of bytes to read
+    syscall
+
+    ; Check for arrow keys
+    cmp byte [rel user_input + 1], 0x5B
+    jne no_arrow
+
+    cmp byte [rel user_input + 2], 0x41 ; Up arrow
+    je move_up
+    cmp byte [rel user_input + 2], 0x42 ; Down arrow
+    je move_down
+    cmp byte [rel user_input + 2], 0x43 ; Right arrow
+    je move_right
+    cmp byte [rel user_input + 2], 0x44 ; Left arrow
+    je move_left
+
+no_arrow:
+    jmp no_user_location
+
+move_up:
+    dec byte [rel user_location_pos]
+    jmp no_user_location
+
+move_down:
+    inc byte [rel user_location_pos]
+    jmp no_user_location
+
+move_right:
+    inc byte [rel user_location_pos]
+    jmp no_user_location
+
+move_left:
+    dec byte [rel user_location_pos]
+    jmp no_user_location
+
+no_escape:
     ; Exit
     mov rax, 0x2000001
     xor rdi, rdi