; atoi base
; prototype : int ft_atoi_base(char *str, char *base)

;global ft_atoi_base
global get_char_index 
global check_base

section .data
invalid_chars: db "+- ", 0x0c, 0x0a, 0x0d, 0x09, 0x0b, 0

section .text

; checks if a char is in the invalid_chars
get_char_index: 
	xor rax, rax
	push rsi

get_char_index_loop:
	cmp dil, [rsi] ;is char invalid
	je get_char_index_found 

	mov al, [rsi] ; is end of string
	test al, al
	lea rsi, [rsi + 1]
	jne get_char_index_loop 

	xor rax, -1 ;not found and at the end
	pop rsi
	ret

get_char_index_found:
	pop rax ;return index of the found char
	sub rsi, rax
	mov rax, rsi 
	ret

;function that checks if the base is valid
;a valid base does not have any of these char : "+-" or any space defined by isspace(3) and does not have any duplicate char
; returns 0 if base is not valid
check_base:
	xor rax, rax

chk_bs_char:
	mov al, [rdi] ; if rdi is \0, return 0
	test al, al
	je base_ok 

	push rdi ; if current char is in invalid_chars
	mov dil, [rdi];
	lea rsi, [rel invalid_chars]
	call get_char_index 
	pop rdi

	cmp rax, -1 ; if not -1, error
	lea rdi, [rdi + 1]
	je chk_bs_char

	xor rax, rax; return 0
	ret

base_ok:
	mov rax,1
	ret