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strings.asm

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section .text

global strlen

global newline

;; libs.asm

extern write

;; --------------------------------

;; strlen(str=rdi)

;; --------------------------------

strlen:

mov rax, 0

.loop:

cmp byte [rdi + rax], 0

je .done

inc rax

jmp .loop

.done:

ret

;; --------------------------------

;; newline()

;; --------------------------------

newline:

sub rsp, 8 ; allocate space below the return address

mov byte [rsp], 10 ; newline character

mov rdi, rsp

mov rsi, 1

call write

add rsp, 8 ; restore stack

ret