write_file

build/a.asm

@@ -18,6 +18,19 @@ _start:
     mov rdi, rax
     mov rax, 60
     syscall
+word_strlen:
+	mov rsi, [r12]      ; addr
+	mov rcx, 0
+strlen_loop:
+	mov al, [rsi + rcx]
+	cmp al, 0
+	je strlen_done
+	inc rcx
+	jmp strlen_loop
+strlen_done:
+	mov [r12], rcx      ; len
+	ret
+    ret
 word_puts:
 	; detects string if top is len>=0 and next is a pointer in [data_start, data_end]
 	mov rax, [r12]      ; len or int value