%include "src/constants.asm"

section .text
	global	strlen

;----- strlen(*str[]) -----;
; Gets the length of given string
; Return value: Length of given string
; Used registers:
;	rax*	Byte to check in str[] >> (ret) length of given string
;	rdi*	(arg) Pointer to str[]
;	rcx*	Counter for scasb
strlen:
	xor	rax, rax
	mov	rcx, -1
	cld
	repne	scasb
	mov	rax, rcx
	not	rax
	dec	rax
	ret