libasm

The aim of this project is to get familiar with assembly language.

Technical considerations

• The project is written in 64 bits ASM, compiled with NASM

• It follows the Intel syntax

• The following functions are rewritten in assembly:

  • ft_strlen: calculate the length of a string
  • ft_strcpy: copy a string
  • ft_strcmp: compare two strings
  • ft_write: write to a file descriptor
  • ft_read: read from a file descriptor
  • ft_strdup: duplicate a string

• Errors during syscalls need to be checked and Errno to be set properly

wiki

• You can check my learnings on assembly on this wiki page

How to test

Disclaimer: This repo provides two versions (Linux & MacOS), due to differences between these two operation systems. Choose the version to test based on your OS.

Run the following commands to test:

$ cd Desktop && git clone https://github.com/qingqingqingli/libasm.git

# for linux
$ cd libasm/linux_libasm
$ make && gcc -no-pie main.c libasm.a && ./a.out

# for macOS
$ cd libasm/mac_libasm
$ make && gcc main.c libasm && ./a.out

Test result example