%ifndef DTOS_INC
%define DTOS_INC
%ifndef MONAD_INC
%include "monad.inc"
%endif
	
	section .data
	_NUMERALS	db	"0123456789ABCDEF"
	_DATA_BYTE_BUFFER	times 63 db "0"
	_FIRST_DIGIT	db	"0", 0x0A, 0

	m_make	DTOS_RESULT,	_DATA_BYTE_BUFFER

%macro dtomz_h 1
	mov	rax,	%1
	mov	rcx,	16
	call	data_to_zstring
%endm

%macro dtomz_d 1
	mov	rax,	%1
	mov	rcx,	10
	call	data_to_zstring
%endm

%macro dtomz_o 1
	mov	rax,	%1
	mov	rcx,	8
	call	data_to_zstring
%endm

%macro dtomz_b 1
	mov	rax,	%1
	mov	rcx,	2
	call	data_to_zstring
%endm

	section .text
clear_data_zstring:
	push	rbp
	mov	rbp,	rsp
	push	rdi
	cld
	lea	rdi,	[rel _DATA_BYTE_BUFFER]
	mov	al,	"0"
	mov	rcx,	64
	rep stosb
	std
	pop	rdi
	mov	rsp,	rbp
	pop	rbp
	ret

data_to_zstring:
	;; rax: Value
	;; rcx: Base
	push	rbp
	mov	rbp,	rsp
	;;
	push	rax
	push	rcx
	call	clear_data_zstring
	pop	rcx
	pop	rax

	cmp	rcx,	16
	ja	.err_exit
	cmp	rcx,	2
	jb	.err_exit
	std
	;; Preserve Caller-saved registers
	push	rsi
	push	rdi
	;;  Initially include newline character
	lea	rdi,	[rel _FIRST_DIGIT]
.loop:
	;; Get lowest digit
	xor	rdx,	rdx
	div	rcx
	;; Set the numeral
	lea	rsi,	[rel _NUMERALS]
	add	rsi,	rdx
	movsb
	cmp	rax,	0
	jne	.loop
	mov	rax,	rdi
	inc	rax
	cld
	;; Recover Registers
	pop	rdi
	pop	rsi
	m_return	rel m_DTOS_RESULT,	rax
	jmp	.exit
.err_exit:
	m_Nothing	rel m_DTOS_RESULT
.exit:
	lea	rax,	[rel m_DTOS_RESULT]
	;;
	mov	rsp,	rbp
	pop	rbp
	ret

data_to_zstring_mh:
	mov	rcx,	16
	call	data_to_zstring
	ret

data_to_zstring_md:
	mov	rcx,	10
	call	data_to_zstring
	ret

data_to_zstring_mo:
	mov	rcx,	8
	call	data_to_zstring
	ret

data_to_zstring_mb:
	mov	rcx,	2
	call	data_to_zstring
	ret
%endif