SIOD(1C)SIOD(1C)NAMEsiod - small scheme interpreter (Scheme In One Defun).
SYNOPSISsiod [-sX] [-hX] [-iX] [-gX] [-oX] [-nX] [-eX] [-vX] [-lX] [-mX] [-vX]
[filenames]
DESCRIPTION
Siod is a very small scheme interpreter which can be used for interac‐
tive calculations, scripts, or included as a command interpreter or
extension/macro language in other applications. See the documentation
for interfacing requirements and how to add user-defined data types.
The dash-style command line options may also be delimited by commas.
ARGUMENTS
The arguments are files which are loaded from the current or SIOD_LIB
directory, by usual default /usr/local/lib/siod. Or the symbol repl to
cause entry into the read-eval-print-loop, or parenthetical expressions
to be evaluated.
COMMAND LINE OPTIONS
-hXXXXX The XXXXX should be an integer, specifying the number of cons
cells to allocate in the heap. The default is 100000:10. Or an
integer followed by a colon, the number after which gives the
maximum number of heaps to malloc with mark and sweep gc mode.
-iXXXXX The XXXXX should be the name of an init file to load before
going into the read/eval/print loop.
-gX The X is 1 for a stop and copy garbage collector, 0 for a mark
and sweep one (the default).
-oXXXXX The XXXXX should be an integer, specifying the size of the
obarray (symbol hash table) to use. Defaults to 1000. Each
array element is a list of symbols.
-nXXXXX The XXXXX should be an integer, specifying the number of pre-
cons numbers to create. The default is 100.
-sXXXXX The XXXXX should be an integer, specifying the number of bytes
of recursion on the machine (C-call frame) stack to allow. This
may be changed while the programming is running, and is mainly
a convenience for detecting defects in programs. Default
200000.
-eXXXXX The XXXXX is an expression to evaluate (after loading the init
file, if any). After evaluating the expression the program
will exit.
-lXXXXX The XXXXX is a library directory to use for the require proce‐
dure. defaults to the environment variable SIOD_LIB or
/usr/local/lib/siod.
-vXXXXX The XXXXX is an integer verboseness from 0 to 4. When used in
scripts the most generally useful level is 0. Defaults to 4.
-mXXXXX The XXXXX can be 0 (default) which has no effect, or 1, which
causes the scheme procedure main, with no arguments to be
invoked after all files are loaded, or 2, which does the same
thing but prevents further arguments from being interpreted, or
3, which will wrap special error handling around the call to
main which is convenient for writing cgi scripts producing
html. The environment may be obtained from the getenv procedure
or the variable *env*. Arguments are found in *args*.
-vXXXXX The XXXXX Is passed along to the siod argument processing, how‐
ever if the value is greater than 0 a Content-type: text/plain
header is generated immediately (except if the number is repre‐
sented with a leading zero), which can be convenient for debug‐
ging WWW cgi scripts. For example:
#!/usr/local/bin/siod -v0,-m2
(define (main)
(writes nil "Hello World0))
Which if invoked normally will result in
%hello.scm
Hello World
And with the verbose flag over-ride on the command line:
%hello.scm -v5
Content-type: text/plain
Welcome to SIOD, Scheme In One Defun, Version 3.1x 12-JUN-95
(C) Copyright 1988-1994 Paradigm Associates Inc.
10 heaps. size = 100000 cells, 2400000 bytes. 2048 inums. GC is mark and sweep
loading hello.scm
(define (main) (writes nil "Hello World
"))
done.
Hello World
EXIT
RETURN VALUE
Errors during non-interactive usage mode result in a non-zero exit sta‐
tus.
ALTERNATIVE SYNTAX
Files which are loaded by the interpreter may contain the sequence of
characters parser:XXXXX in a comment in the first line of the file.
This will result in the automatic loading of the file parser_XXXXX.scm
which must provide a procedure parser_XXXXX to return a procedure to
read the forms from the file to be loaded. Useful values of XXXXX
include read, pratt, and fasl.
FILES
/usr/local/lib/siod/* /usr/local/lib/siod/siod.html /usr/local/lib/lib‐
siod.so
SEE ALSO
command csiod http://people.delphi.com/gjc/siod.html
Structure and Interpretation of Computer Programs , by Abelson and
Sussman, MIT Press.
DIAGNOSTICS
Error messages may also set the variable errobj to the offending
object.
BUGS
With -g1 it does not GC during EVAL, only before each READ/EVAL/PRINT
cycle. It does GC during EVAL with -g0, but that code may not run
without modification on all architectures.
VERSION
Current version is 3.2, 12-MAR-96, by George Carrette.
GJC@world.std.com
LOCAL SIOD(1C)
