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|
; **************************************************************************** ;
; ;
; ::: :::::::: ;
; ft_strdup.s :+: :+: :+: ;
; +:+ +:+ +:+ ;
; By: cacharle <marvin@42.fr> +;+ +:+ +;+ ;
; +;+;+;+;+;+ +;+ ;
; Created: 2019/11/22 03:04:32 by cacharle ;+; ;+; ;
; Updated: 2019/11/23 00:19:26 by cacharle ;;; ;;;;;;;;.fr ;
; ;
; **************************************************************************** ;
%ifdef __LINUX__
%define M_FT_STRDUP ft_strdup
%define M_FT_STRLEN ft_strlen
%define M_FT_STRCPY ft_strcpy
%define M_MALLOC malloc wrt ..plt
%else
%define M_FT_STRDUP _ft_strdup
%define M_FT_STRLEN _ft_strlen
%define M_FT_STRCPY _ft_strcpy
%define M_MALLOC _malloc
%endif
extern M_FT_STRLEN
extern M_FT_STRCPY
extern M_MALLOC
global M_FT_STRDUP
section .text
; char *ft_strdup(const char *str);
M_FT_STRDUP:
push rdi ; save rdi because it will be overwrite for malloc
call M_FT_STRLEN ; rdi is still == str
inc rax ; len++ for '\0'
mov rdi, rax ; size to malloc
call M_MALLOC
cmp rax, 0
je FT_STRDUP_ERROR
pop rsi ; original str as src
mov rdi, rax ; allocated as dest
call M_FT_STRCPY
ret
FT_STRDUP_ERROR:
pop rdi
ret
|
