NOTICE: My xv6 runs in QEMU simulator.

The folder xv6_all_files contains all the original code and all the executable file of xv6-rev7(release version 7) system.

editor.c file contains the main code of my simple editor.

The simple editor can simply highlight the C language. Its effect is demostrated below.

This editor can mostly undo 20 steps sequently. It depends on the variable MAX_ROLLBACK_STEP. If you want more undo step, just extend this variable. There is a small bug with undo delete command. Unfortunately, it still has not been resolved though I have paid a lot of time on it. I suspect that I triggered a unfound system bug. Who knows? But don't worry about that. This small bug just limit our ability to undo the delete operation and I have forbidden this function. The other function wouldn't be affected. So you can use this editor safely. I have mark the code which with bug in the editor.c.

Furthermore, press help instruction for more operating detail. All the operations are here.

sudo apt-get install -y build-essential gdb 

sudo apt-get install gcc-multilib

sudo apt-get install qemu

git clone git://github.com/mit-pdos/xv6-public.git

tips: rev7 version is more stable and reliable.

cd xv6-public-master

git checkout -b xv6-rev7 xv6-rev7

QEMU = qemu-system-x86_64

make

make qemu-nox

We should know the fact that how make instruction compiles xv6 system is depending on Makefile. So we should add something properly to Makefile file.

1. Open Makefile file.

2. Find out the following two parts of code and add the content which circled with red box.

   

   

3. Then save Makefile and compile xv6 again.