1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
# **************************************************************************** #
# #
# ::: :::::::: #
# ft_atoi_base.s :+: :+: :+: #
# +:+ +:+ +:+ #
# By: cacharle <marvin@42.fr> +#+ +:+ +#+ #
# +#+#+#+#+#+ +#+ #
# Created: 2019/11/22 03:59:15 by cacharle #+# #+# #
# Updated: 2019/11/22 05:20:12 by cacharle ### ########.fr #
# #
# **************************************************************************** #
.globl _ft_atoi_base
_ft_atoi_base:
mov rbx, rdi # rbx = str
mov rcx, rsi # rcx = base
xor rdx, rdx # rdx = 0
# remove spaces
FT_ATOI_BASE_SPACE_LOOP:
cmp byte ptr [rbx], 20h # if space jump next
je NEXT
mov dl, byte ptr [rbx] # if \t\n\r\v\f jump next
sub dl, 9h
cmp dl, 5h
jl NEXT
jmp FT_ATOI_BASE_SPACE_LOOP_END # if all above false end loop
NEXT: # next iteration
inc rbx
jmp FT_ATOI_BASE_SPACE_LOOP
FT_ATOI_BASE_SPACE_LOOP_END:
xor rax, rax # rax = 0
xor rdx, rdx # rdx = 0
FT_ATOI_BASE_LOOP:
# while isdigit
cmp byte ptr [rbx], 30h
jl FT_ATOI_BASE_END # if *rbx < '0' jmp end
cmp byte ptr [rbx], 39h
ja FT_ATOI_BASE_END # if *rbx > '9' jmp end
imul eax, 10 # eax *= 10
# dl = *str & 0x0F
mov dl, byte ptr [rbx]
and dl, 0x0F
add eax, edx # eax += dl (digit)
inc rbx # next char
jmp FT_ATOI_BASE_LOOP
FT_ATOI_BASE_END:
ret
|
