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-
- Release Notes for STEVIE - Version 3.68
-
- Atari ST Editor for VI Enthusiasts
-
- Porting
-
-
- Tony Andrews
-
- 8/6/88
-
-
- 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 running TOS
- unix.c: UNIX System V or BSD
- os2.c: Microsoft OS/2
- dos.c: MS DOS 3.3
- minix.c: Minix on the Atari ST
-
-
- Each of these files are around 250 lines long and deal with
- low-level issues like character I/O to the terminal, terminal
- initialization, signal handling (if supported), cursor addressing, and
- so on. There are different tradeoffs to be made depending on the
- environment. For example, the UNIX and Minix versions buffer 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.
-
- The file "env.h" contains macro definitions to customize the
- editor for your particular environment. The macros there select the
- machine/os, enable various optional features, etc.
-
- One of the options in env.h is whether to use the termcap
- routines or hard-wired escape sequences. The hard-wired sequences,
- if used, are defined in term.h. The file term.c contains code to access
- the termcap database, if enabled. Termcap is only supported by some of
- the system-dependent files (unix.c and minix.c) but can be added easily
- to others, if needed.
-
-
- 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 to 'env.h' to define the macro
- name you've chosen.
-
- 2. Look at the system-dependent files 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. Compile and debug the editor.
-
-
- In most cases it should really be that simple. Other ports have
- been done for which I don't have the code, including the Amiga, and a
- Data General machine of some kind (in Australia).
-