utoa/printf: Support octal (%o)

src/convert.asm

@@ -123,7 +123,7 @@ itoa:
 ;----- utoa(int, base, padLen, bool padZeroes, bool upperCase) -----;
 ; Converts an unsigned integer to a string
 ; Return value: Pointer to converted string or 0(EOS) if entered base is invalid
-; Supported bases: 2 (binary), 10 (decimal), 16 (hexadecimal)
+; Supported bases: 2 (binary), 8, (octal), 10 (decimal), 16 (hexadecimal)
 ; Used registers:
 ;	rax*	num to divide (DIV) >> Copy bytes when reversing string >> (ret) Pointer to converted string
 ;	rbx	Stores (upperCase)
@@ -143,6 +143,8 @@ utoa:
 	; Before doing anything, check if base is valid
 	cmp	rsi, 2
 	je	.ok
+	cmp	rsi, 8
+	je	.ok
 	cmp	rsi, 10
 	je	.ok
 	cmp	rsi, 16
@@ -161,7 +163,7 @@ utoa:
 	mov	r13, rsi
 	mov	r14, rdx
 	mov	r15, rcx
-	; First, assure 0 <= padLen <= 64 ;(64, even though max signed int64 = 19 characters; enables to pad with base 2)
+	; First, assure 0 <= padLen <= 64
 	mov	rdi, rdx
 	xor	rsi, rsi
 	mov	rdx, 64