atoi: Prevent (unsigned) overflow

src/convert.asm

@@ -150,6 +150,12 @@ atoi:
 		.calcNum_cnt:
 		imul	r9
 
+		mov	rdx, -1
+		sub	rdx, r10
+		cmp	rax, rdx
+		;TODO: Add signed checks
+		ja	.overflow
+
 		add	r10, rax
 		dec	rdi
 		inc	r8
@@ -159,6 +165,10 @@ atoi:
 
 	.wrapup_neg:
 	neg	r10
+	jmp	.quit
+
+	.overflow:
+	xor	r10, r10
 
 	.quit:
 	mov	rax, r10