extern libz_strlen

global libz_tolower
section .text

libz_tolower:
	sub rsp, 8	;enter

	mov r11, rdi

	call libz_strlen
	mov r10, rax


	xor rcx, rcx	;we do this to clear rcx incase it had garbage in it before
_loop:
	;do loop things

	mov r9, r11
	add r9, rcx

	mov r8b, [r9]	;this block here makes sure that our character is a capital letter and if its not a capital letter do nothing and return
	cmp r8b, 90
	ja _endloop
	cmp r8b, 65
	jb _endloop

	add r8b, 32	;make the letter capital
	mov [r9], r8b

_endloop:
	;end loop
	inc rcx
	cmp rcx, r10
	jle _loop

	add rsp, 8	;exit
	ret