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|
; **************************************************************************** ;
; ;
; ::: :::::::: ;
; ft_write.s :+: :+: :+: ;
; +:+ +:+ +:+ ;
; By: cacharle <marvin@42.fr> +;+ +:+ +;+ ;
; +;+;+;+;+;+ +;+ ;
; Created: 2019/11/22 03:04:47 by cacharle ;+; ;+; ;
; Updated: 2019/11/22 21:19:02 by cacharle ;;; ;;;;;;;;.fr ;
; ;
; **************************************************************************** ;
global ft_write
%define F_GETFD 1
%define SYSCALL_WRITE 0x2000004
%define SYSCALL_FCNTL 0x200005c
; int ft_write(int rdi, const void *rsi, size_t rdx);
ft_write:
cmp rdx, 0
je FT_WRITE_NO_SIZE
cmp rdi, 0
jl FT_WRITE_ERROR ; fd < 0
cmp rsi, 0
je FT_WRITE_ERROR ; buf == NULL
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_WRITE_ERROR
mov rax, SYSCALL_WRITE
syscall
ret
FT_WRITE_ERROR:
mov rax, -1
ret
FT_WRITE_NO_SIZE:
mov rax, 0
ret
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