itoa

input/core/itoa.asm

@@ -0,0 +1,29 @@
+section .bss
+    buffer resb 20
+
+section .text
+    global itoa
+
+itoa:
+    push rbx
+    push rsi
+    push rdx
+    mov rax, rdi
+    mov rsi, buffer + 19
+    mov byte [rsi], 0
+    dec rsi
+.loop:
+    xor rdx, rdx
+    mov rbx, 10
+    div rbx
+    add dl, '0'
+    mov [rsi], dl
+    dec rsi
+    test rax, rax
+    jnz .loop
+    inc rsi
+    mov rax, rsi
+    pop rdx
+    pop rsi
+    pop rbx
+    ret