add user input handling

src/drawing.asm

@@ -9,7 +9,8 @@ section .bss
 	extern term_cols
 
 	extern gameboard_size
-
+	
+	global simulation_running
 	simulation_running: RESB 1
 
 section .rodata 
@@ -20,8 +21,8 @@ section .rodata
 
 	home_cursor:	db ESC_CHAR, "[H", 0
 
-	statusbar:	db ESC_CHAR, "[30;100m", "Use arrow keys to move cursor, enter to invert cell h/j to change simulation speed, p to       simulation", 0
+	statusbar:	db ESC_CHAR, "[30;100m", "Use arrow keys to move cursor, enter to invert cell j/k to change simulation speed, p to       simulation", 0
-	START_STOP_pos: equ $-statusbar-16
+	START_STOP_pos: equ $-statusbar-17
 	
 	
 	start_str:	db "START", 0
@@ -68,8 +69,24 @@ global print_game_ui
 print_game_ui:
 	lea rdi, [home_cursor]
 	call print_str
-	
+
 	mov qword rdi, [gameboard_ptr]
+	push rdi
+	add rdi, [gameboard_size]
+	sub di, [term_cols]
+	add rdi, START_STOP_pos
+	
+	mov cl, [simulation_running]
+	test cl,cl; test if simulation is running 
+	jz .simulation_not_running
+	lea rsi, [stop_str]
+	jmp .end_simulation_running_check
+	.simulation_not_running:
+	lea rsi, [start_str]
+	.end_simulation_running_check:
+	call string_copy
+
+	pop rdi
 	call print_str
 	
 	

src/input.asm

@@ -1,12 +1,141 @@
+%include "symbols.asm"
 
 section .bss
-	cursor_rows: RESW 1
+	cursor_rows: RESW 1; TODO DONT FORGET TO INICIALIZE
 	cursor_cols: RESW 1
 
+	extern multipurpuse_buf
+
+	extern term_rows
+	extern term_cols
+
+	extern gameboard_ptr
+
+	extern simulation_running
+
+section .rodata
+
+	cursor_up: db ESC_CHAR, "[1A", 0
+	cursor_down: db ESC_CHAR, "[1B", 0
+	cursor_right: db ESC_CHAR, "[1C", 0
+	cursor_left: db ESC_CHAR, "[1D", 0
+	
+
+	arrow_switch_statement:
+		dq handle_user_input.arrow_up
+		dq handle_user_input.arrow_down
+		dq handle_user_input.arrow_right
+		dq handle_user_input.arrow_left
+
 section .text
 
-global handle_user_input
+extern print_str
-handle_user_input:
 
+global handle_user_input
+handle_user_input:; main loop of the program
+
+	.main_loop:
+
+	xor rax, rax
+	mov qword [multipurpuse_buf], rax; zeroout the buffer
+
+	mov rax, SYS_POLL
+	mov rdi, STDIN
+	mov rsi, 1; only one file descriptor is provided
+	mov rdx, 0; no timeout. maybe use this for final sleep but run if user inputs something TODO
+	syscall
+
+	test rax, rax; SYS_POLL returns 0 when no change happens within timeout
+	jz .no_input 
+	
+	mov rax, SYS_READ
+	mov rdi, STDIN
+	lea rsi, [multipurpuse_buf]
+	mov rdx, 8; size of multipurpuse buffer
+	syscall; read user input
+
+	mov rax, [multipurpuse_buf]
+	shr rax, 5; we need only 3 bytes for this inpus sceame
+
+	cmp eax, 0x001B5B44; check if input is more than left arrow
+	ja .handle_single_byte_chars
+
+	sub eax, 0x1B5B41
+	jmp [arrow_switch_statement+(rax*8)]; lets hope this works
+
+	.arrow_up:
+	dec word [cursor_rows]
+	lea rdi, [cursor_up]
+	call print_str
+	jmp .no_input
+	.arrow_down:
+	inc word [cursor_rows]
+	lea rdi, [cursor_down]
+	call print_str
+	jmp .no_input
+	.arrow_right:
+ 	inc word [cursor_cols]
+	lea rdi, [cursor_right]
+	call print_str
+	jmp .no_input
+	.arrow_left:
+	dec word [cursor_cols]
+	lea rdi, [cursor_left]
+	call print_str
+	jmp .no_input
+
+	.handle_single_byte_chars:
+
+	shr eax, 2; get the char to al 
+
+	cmp al, 0xa; NEWLINE (enter key)
+	jne .check_p
+
+	xor rax, rax; zeroout rax
+	mov ax, [cursor_rows]
+	mul dword [term_cols]
+	add rax, [cursor_cols]
+	
+	lea rdi, [gameboard_ptr+rax]
+	mov cl, [rdi]
+	cmp cl, '#'
+	je .hashtag_present
+
+	mov byte [rdi], '#'
+	jmp .no_input
+
+	.hashtag_present:
+
+	mov byte [rdi], ' '
+	jmp .no_input
+
+	.check_p:
+	cmp al, 'p'
+	jne .check_j
+
+	xor byte [simulation_running], 0x01; switch simulation on or off
+
+	jmp .no_input
+
+	.check_j:
+	cmp al, 'j'
+	jne .check_k
+
+	; TODO implement simulation speed
+
+	jmp .no_input
+
+	.check_k:
+	cmp al, 'k'
+	jne .no_input
+
+	; TODO implement simulation speed
+
+	.no_input:
+
+		
+	jmp .main_loop
+
+	ret
 	
 	

src/main.asm

@@ -3,6 +3,7 @@
 
 
 section .bss
+	global multipurpuse_buf
 	multipurpuse_buf: RESB 8
 	
 	global term_rows
@@ -72,6 +73,13 @@ _start:
 	mov [gameboard_ptr], rax; stores pointer to gameboard array
 	call init_gameboard
 
+	; make stdin non-blocking in case polling somehow fails, or am i stupid
+	mov rax, SYS_FCNTL
+	mov rdi, STDIN
+	mov rsi, F_SETFL
+	mov rdx, O_NONBLOCK
+	syscall
+
 	call print_game_ui	
 
 

src/symbols.asm

@@ -1,10 +1,18 @@
 SYS_EXIT 	equ 60
 SYS_IOCTL	equ 16
+SYS_READ 	equ 0
 SYS_WRITE 	equ 1
 SYS_BRK		equ 12
+SYS_FCNTL	equ 72
+SYS_POLL	equ 7
 
+STDIN		equ 0
 STDOUT		equ 1
+
 TIOCGWINSZ	equ 0x5413
+POLLIN		equ 1 
+F_SETFL		equ 4 
+O_NONBLOCK	equ 2048
 
 ASCII_ZERO 	equ 48
 ESC_CHAR 	equ 27