start project

srcs/ft_strlen.s

@@ -0,0 +1,24 @@
+section .text
+	global ft_strlen
+
+ft_strlen:
+	test rdi, rdi
+	je err
+	mov rsi, rdi
+	jmp loop_start
+
+increase_pointer:
+	lea rsi, [rsi + 1]
+
+loop_start:
+	mov al, [rsi]
+	test al, al
+	jnz increase_pointer
+end:
+	sub rsi, rdi 
+	mov rax, rsi
+	ret
+
+err:
+	xor rax, rax
+	ret