add bonus rule and start making ft_atoi_base

srcs/bonus/ft_atoi_base.s

@@ -0,0 +1,63 @@
+; 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