What is KSM-Scheme?

KSM-Scheme is a Scheme interprter that integrates easily with functions and variables defined in C language. KSM-Scheme implements Revised5 Report on the Algorithmic Language Scheme standard. In addition to the standard, KSM-Scheme has extensions that enable to call C functions and to manipulate C variables. For example, if one has a shared library named "libsome.so", in which there are following definitions,

int inum = 123; int add(int a, int b) { return a+b; }

In order to manipulate these variable and function, compilation of glue functions (written in C language) is not required. One can do that completely within KSM-Scheme as follow,

(load-shared "libsome.so")
(define inum (clang:sym int inum))
(define add (clang:sym int (add int int)))
inum ==> 123
(set! inum 1000) ;; inum in libsome.so is modified
inum ==> 1000
(add inum 234) ==> 1234 ;; call of C function "add"

Besides easy interface to C language, KSM-Scheme has following features.
How to download KSM-Scheme

Current version (version 0.3.2) is available to download ksm-0.3.2.tar.gz
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How to make KSM-Scheme

1. Extract archive. Following command will create a directory `ksm-0.3.2' which contains source code.

$ tar -xzvf ksm-0.3.2.tar.gz

2. `cd' to `ksm-0.3.2'

$ cd ksm-0.3.2

3. Do configuration

$ ./configure

By default, necessary files are installed in /usr/local/ksm directory, executable `ksm' is installed in /usr/local/bin, man file in /usr/local/man, and info files are installed in /usr/local/info. If these defaults are not desirable (for example, all files are to be installed in the user's home directory), following options to ./configure can be used.

$ ./configure --prefix=/home/hangil

With this option (--prefix), necessary files are installed in /home/hangil/ksm, executable in /home/hangil/bin, and info files in /home/hangil/info

$ ./configure --prefix=/home/hangil --bindir=/usr/bin

With this option (--prefix and --bindir), necessary files are installed in /home/hangil/ksm, executable int /usr/bin, and info files in /home/hangil/info

$ ./configure --prefix=/home/hangil --bindir=/usr/bin --infodir=/usr/info

With this option (--prefix and --bindir), necessary files are installed in /home/hangil/ksm, executable int /usr/bin, and info files in /usr/info

$ ./configure --mandir=/usr/man

With this option (--mandir), man file is installed in /usr/man 4. Do make

$ make

5. Do install

$ install

Depending on the circumstances, PATH or INFOPATH environment variables may be adjusted. For example, if the directory under which executable `ksm' is installed is not included in PATH,

$ export PATH=/home/hangil/bin:$PATH

If the directory under which info files are installed cannot be accessed by `info' command,

$ export INFOPATH=/home/hangil/info:$INFOPATH

In the distribution, sample Scheme programs are included ("r5rs.scm" and "pi.scm") under the ksm-0.3.2 directory. "pi.scm" is from SCM Scheme ditribution. It uses bignum features of KSM-SCheme, which is available only under the system that has GMP library. If the system does not have GMP library, `(load "pi.scm")' will raise an error.

$ ksm
> (load "r5rs.scm")
> (load "pi.scm")
> (pi 1000)
1415926535 ...

How to invoke KSM-Scheme

KSM-Scheme is invoked from the command line as

ksm [options] [FILE ARG ...]

Acceptable options are

-xl FILE load FILE before starting the interpreter -xc ENCODING set the default encoding to ENCODING -xh display the help information

If ENCODING is specified, input files (including standard input) are assumed to be encoding by ENCODING and they are automatically converted to UTF-8 encoding while reading the file. Output files (including standard output and standard error) are automatically converted to ENCODING from UTF-8 that is the internal encoding in KSM-Scheme.

For example, to use KSM-Scheme under the circumstances in which `kterm' with default encoding of EUC-JP is used, following invocation will provide the desirable interaction.

ksm -xc EUC-JP

If FILE is specified, it should be the name of a Scheme source file. The KSM-Scheme interpreter loads the file and then terminates. If FILEfile is omitted, KSM-Scheme enters an interactive mode and accepts Scheme source from standard input.

If ARGS are specified, it is passed the FILE program as command line arguments. They can be accessed by `cmdline-args' from the program.

$ cat src.scm
(display (cmdline-args))
$ ksm src.scm a b c
(src.scm a b c)


Reference Manual
C language interface
Multi-threaded programming
R5RS Scheme Standard
Scheme standard in PostScript format

Other Scheme Implementations

Supported platforms

At present, Linux systems with PowerPC or Intel x86 CPU are supported.


Written by Hangil Chang <hchang-tky@umin.ac.jp>
Last update: May 14, 2001