;; Modified from: https://gist.github.com/SplittyDev/8e728627012e57ac0deac196660014fb

;
; Routine to convert a 32-bit integer to a string.
; Registers are preserved.
;
; EAX: Source integer
; EBX: Target address
; ECX: Base
;
; Internal register layout:
; start:
; EAX: Source integer
; ECX: Target address
; EDX: Base
; checknegative:
; EAX: Source integer
; EBX: Target address (original)
; ECX: Target address (active)
; divrem:
; EAX: Source integer
; ECX: Target address (active)
; EDX: Base / Result
; reverse:
; EBX: Target address (original)
; ECX: Target address (active)
; EDX: Target address (temporary)
;
__uitoa:
.start:
	push ebp
	mov ebp, esp

	push eax
	push ebx
	push ecx
	push edx

	mov eax, [ebp+8]
	mov ecx, [ebp+12]
	mov ebx, [ebp+16]

	mov edx, ecx
	mov ecx, ebx
;.checknegative:
;    test eax, eax
;    jns .divrem
;    mov byte [ecx], 0x2D
;    inc ecx
;    mov ebx, ecx
;    neg eax
.divrem:
	push edx
	push ecx
	mov ecx, edx
	xor edx, edx
	div ecx
	mov byte dl, [__itoacvt + edx]
	pop ecx
	mov byte [ecx], dl
	pop edx
	inc ecx
	cmp eax, 0x00
	jne .divrem
	mov byte [ecx], 0x00
	dec ecx
.reverse:
	cmp ebx, ecx
	jge .end
	mov byte dl, [ebx]
	mov byte al, [ecx]
	mov byte [ebx], al
	mov byte [ecx], dl
	inc ebx
	dec ecx
	jmp .reverse
.end:
	pop edx
	pop ecx
	pop ebx
	pop eax

	pop ebp
	ret

;
; Conversion table for __itoa.
; Works for bases [2 ... 36].
;
__itoacvt:
	db '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'

;
; Buffer to store the result of __itoa in.
;
align 64
__itoabuf32:
	rb 36