OpenBSD ed(1) for DOS
=====================

* Introduction
* Documentation
* Hints
* Source Code

Introduction
============

This is portable OpenBSD ed(1) version 7.4 compiled for DOS.
It is compiled using the tiny-regex-c regular expression library.

* oed.exe is 16-bit

* oed32.exe is 32-bit, has LFN support, and requires a DPMI host
  such as CWSDPMI

<https://github.com/ibara/oed>
<https://github.com/gyrovorbis/tiny-regex-c>

Documentation
=============

* doc/oed.txt
* doc/tinyre.txt
* <gopher://katolaz.net/0/ed_tutorial.txt>

Hints
=====
* tiny-regex-c requires + to be escaped in the following regex.

OLD: s/^+/-/
NEW: s/^\+/-/

* oed requires an address after the 't' command.
  Specify the current line with '.'
 
OLD: /tea/t
NEW: /tea/t.

* DOS doesn't really do pipes

OLD: printf ",p\n" | ed TODO.txt
NEW: echo ,p>input.txt
NEW: oed TODO.txt <input.txt

OLD: r ! ls -l
NEW: !dir /lfn >tmp.txt
NEW: r tmp.txt

Source Code
===========
The source code is in the src/ directory.
My changes are in src/oed.dif

make -f Makefile.bcc     ; build oed.com with BCC & tiny-regex-c
wmake -f Makefile.watcom ; build oed.exe with Watcom & tiny-regex-c
make -f Makefile.tinyre  ; build oed32.exe with DJGPP & tiny-regex-c
make -f Makefile.dj      ; build bsded.exe with DJGPP & BSD regex