SIOD(1C) SIOD(1C)
LOCAL
NAME
siod - small scheme interpreter (Scheme In One Defun).
SYNOPSIS
siod [-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
interactive 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.
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SIOD(1C) SIOD(1C)
LOCAL
-lXXXXX The XXXXX is a library directory to use for the require
procedure. 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,
however if the value is greater than 0 a Content-type:
text/plain header is generated immediately (except if the
number is represented with a leading zero), which can be
convenient for debugging 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
status.
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
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SIOD(1C) SIOD(1C)
LOCAL
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/libsiod.so
SEE ALSO
command csiod
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
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