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1987-07-26
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These are the sources for the Amiga port of LOGO.
I have only included those files which are specifically required to
construct the AMIGA version of this program. Files required for
other versions (GIGI / TEK / ADM etc terminals) can be found in the
original Usenet posting of these sources.
I've pre-YACCed the original "logo.y" to form "y.tab.c", included here.
I have re-written "splithelp.c" to do a better job of splitting up the
"logoman" documentation file.
A new file, "amiga.c", contains most of the AMIGA-specific code.
I did this port using Manx 3.4a, and did use some functions (fexecl, etc.)
specific to this compiler/runtimes; you'll have to do some work if you're
using Lattice.
The "makefile" is for Manx 3.4a.
===========================================
Work that needs to be done.
1. Turtle graphics. I'm somewhat embarrassed that I didn't do a better
job. C'mon, this is an AMIGA! (speech, music, etc?)
2. Runnable from WorkBench. I almost got this to work, but ran into
problems with the "dos", "chdir", and "edit" commands playing together
properly.
3. I never REALLY tested the cbreak stuff to any great degree.
4. Math. I briefly tried using MANX and AMIGA double math, but things
started to break. The original UNIX version trapped SIGFPE, but we
don't here. The program will catch /0 errors, but I fear other kinds
of math errors may cause a blowup.
5. Keyboard signal trapping. I've sort of simulated a UNIX "signal()"
function to catch SIGQUIT and SIGINT (ctrl-C and ctrl-D). We do a
SetExcept() to catch these keys. The original UNIX program used a
longjmp() out of it's signal handler; we simply cannot do that on the
AMIGA. So, I set a flag and look in getchr() and yylex(). Maybe the
flag needs to be checked in other places??
6. More testing.
=============================================
- scott evernden