blob: a94cece04dbd9c3caa9ab7f9b5e77ce490745499 (
plain)
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
|
; **************************************************************************** ;
; ;
; ::: :::::::: ;
; ft_read.s :+: :+: :+: ;
; +:+ +:+ +:+ ;
; By: cacharle <marvin@42.fr> +;+ +:+ +;+ ;
; +;+;+;+;+;+ +;+ ;
; Created: 2019/11/22 03:04:44 by cacharle ;+; ;+; ;
; Updated: 2019/11/22 21:19:13 by cacharle ;;; ;;;;;;;;.fr ;
; ;
; **************************************************************************** ;
global ft_read
%define F_GETFD 1
%define SYSCALL_READ 0x2000003
%define SYSCALL_FCNTL 0x200005c
; int ft_read(int, void*, size_t);
ft_read:
cmp rdx, 0
je FT_READ_NO_SIZE
cmp rdi, 0
jl FT_READ_ERROR
cmp rsi, 0
je FT_READ_ERROR
push rdx
push rsi
xor rsi, rsi
mov esi, F_GETFD
mov rax, SYSCALL_FCNTL
syscall
pop rsi
pop rdx
cmp eax, 0
jne FT_READ_ERROR
mov rax, SYSCALL_READ
syscall
ret
FT_READ_ERROR:
mov rax, -1
ret
FT_READ_NO_SIZE:
xor rax, rax
ret
|
