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-
- Release Notes for STEVIE - Version 3.10
-
- Atari ST Editor for VI Enthusiasts
-
- Porting
-
-
- Tony Andrews
-
- 3/6/88
-
-
- Porting the editor is a relatively simple task. Most of the
- code is pretty machine-independent. For each environment, there is
- a file of routines that perform various low-level operations that
- tend to vary a lot from one machine to another. Another file contains
- the escape sequences to be used for each machine.
-
- The machine-dependent files currently used are:
-
- tos.c: Atari ST - ifdef for either Megamax or Alcyon
-
- unix.c: UNIX System V
-
- os2.c: Microsoft OS/2
-
-
- Each of these files are around 150 lines long and deal with
- low-level issues like character I/O to the terminal, terminal
- initialization, cursor addressing, and so on. There are different
- tradeoffs to be made depending on the environment. For example, the
- UNIX version buffers terminal output because of the relatively high
- overhead of system calls. A quick look at the files will make it clear
- what needs to be done in a new environment.
-
- Terminal escape sequences are in the file "term.h". These are
- defined statically, for the time being. There is some discussion in
- term.h regarding which sequences are optional and which are not. The
- editor is somewhat flexible in dealing with a lack of terminal
- capabilities.
-
- Because not all C compilers support command line macro definitions,
- the #define's for system-specific macros are placed at the beginning of the
- file 'stevie.h'. If you port to a new system, add another line there to
- define the macro you choose for your port.
-
- The basic process for doing a new port is:
-
- 1. Come up with a macro name to use when ifdef'ing your system-
- specific changes. Add a line at the top of 'stevie.h' to define
- the macro name you've chosen.
-
- 2. Look at unix.c, tos.c, and os2.c and copy the one that comes
- closest to working on your system. Then modify your new file
- as needed.
-
- 3. Look at term.h and edit the file appropriately adding a new
- set of escape sequence definitions for your system.
-
- 4. If you haven't already, get a copy of Henry Spencer's regular
- expression library and compile it. This has been very simple
- every time I've done it.
-
- 5. Compiling and debug the editor.
-
-
- In most cases it should really be that simple. I've done two
- ports (UNIX and OS/2) and both were complete in just a couple of hours.
-