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+;;;"elk.init" Initialisation file for SLIB for ELK 2.1 -*- Scheme -*-
+;;; Copyright (C) 1991, 1992, 1993 Aubrey Jaffer.
+;
+;Permission to copy this software, to redistribute it, and to use it
+;for any purpose is granted, subject to the following restrictions and
+;understandings.
+;
+;1. Any copy made of this software must include this copyright notice
+;in full.
+;
+;2. I have made no warrantee or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3. In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+; No guarantees are given about the correctness of any of the
+; choices made below. Only enough work was done to get the require
+; mechanism to work correctly.
+;
+; Stephen J. Bevan <bevan@cs.man.ac.uk> 19920912 modified by Mike
+; Sperber to work correctly with statically-linked Elk and slib1d. Be
+; sure to change the library vicinities according to your local
+; configuration. If you're running MS-DOS (which is possible since
+; 2.1), you probably have to change this file to make everything work
+; correctly.
+
+;;; (software-type) should be set to the generic operating system type.
+;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.
+
+(define (software-type) 'UNIX)
+
+;;; (scheme-implementation-type) should return the name of the scheme
+;;; implementation loading this file.
+
+(define (scheme-implementation-type) 'Elk)
+
+;;; (scheme-implementation-version) should return a string describing
+;;; the version the scheme implementation loading this file.
+
+(define (scheme-implementation-version) "?2.1")
+
+;;; (implementation-vicinity) should be defined to be the pathname of
+;;; the directory where any auxillary files to your Scheme
+;;; implementation reside.
+
+(define (implementation-vicinity)
+ (case (software-type)
+ ((UNIX) "/usr/local/lib/elk-2.1/scm/")
+ ((VMS) "scheme$src:")
+ ((MS-DOS) "C:\\scheme\\")))
+
+;;; (library-vicinity) should be defined to be the pathname of the
+;;; directory where files of Scheme library functions reside.
+
+(define library-vicinity
+ (let ((library-path
+ (or (getenv "SCHEME_LIBRARY_PATH")
+ ;; Uses this path if SCHEME_LIBRARY_PATH is not defined.
+ (case (software-type)
+ ((UNIX) "/usr/local/lib/slib/")
+ ((VMS) "lib$scheme:")
+ ((MS-DOS) "C:\\SLIB\\")
+ (else "")))))
+ (lambda () library-path)))
+
+;;; *features* should be set to a list of symbols describing features
+;;; of this implementation. Suggestions for features are:
+
+(define *features*
+ '(
+ source ;can load scheme source files
+ ;(slib:load-source "filename")
+ compiled ;can load compiled files
+ ;(slib:load-compiled "filename")
+ rev4-report
+ ieee-p1178
+ sicp
+ rev4-optional-procedures
+ rev3-procedures
+ rev2-procedures
+ multiarg/and-
+ multiarg-apply
+ delay
+ transcript
+ full-continuation
+ sort
+ format
+ system
+ getenv
+ program-arguments
+ string-port
+ ))
+
+;------------
+
+(define program-arguments
+ (lambda ()
+ (cons "undefined-program-name" (command-line-args))))
+
+; EXACT? appears to always return #f which isn't very useful.
+; Approximating it with INTEGER? at least means that some
+; of the code in the library will work correctly
+
+(define exact? integer?) ; WARNING: redefining EXACT?
+
+(define (inexact? arg)
+ (not (exact? arg)))
+
+;;; (TMPNAM) makes a temporary file name.
+(define tmpnam
+ (let ((cntr 100))
+ (lambda () (set! cntr (+ 1 cntr))
+ (let ((tmp (string-append "slib_" (number->string cntr))))
+ (if (file-exists? tmp) (tmpnam) tmp)))))
+
+(require 'unix)
+
+; Pull in GENTENV and SYSTEM
+
+;;; (FILE-EXISTS? <string>) already here.
+
+;;; (DELETE-FILE <string>)
+(define (delete-file f) (system (string-append "rm " f)))
+
+;------------
+
+;;; (OUTPUT-PORT-WIDTH <port>)
+(define (output-port-width . arg) 79)
+
+;;; (OUTPUT-PORT-HEIGHT <port>)
+(define (output-port-height . arg) 24)
+
+;;; (CURRENT-ERROR-PORT)
+;;; is already defined in Elk 2.1
+
+;;; FORCE-OUTPUT flushes any pending output on optional arg output port
+;;; use this definition if your system doesn't have such a procedure.
+(define force-output flush-output-port)
+
+;;; CALL-WITH-INPUT-STRING and CALL-WITH-OUTPUT-STRING are the string
+;;; port versions of CALL-WITH-*PUT-FILE.
+(define (call-with-output-string f)
+ (let ((outsp (open-output-string)))
+ (f outsp)
+ (let ((s (get-output-string outsp)))
+ (close-output-port outsp)
+ s)))
+
+(define (call-with-input-string s f)
+ (let* ((insp (open-input-string s))
+ (res (f insp)))
+ (close-input-port insp)
+ res))
+
+;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
+;;; be returned by CHAR->INTEGER.
+(define char-code-limit 256)
+
+;;; MOST-POSITIVE-FIXNUM is used in modular.scm
+(define most-positive-fixnum 8388608) ; 23 bit integers ?
+
+;;; Return argument
+(define (identity x) x)
+
+;;; If your implementation provides eval SLIB:EVAL is single argument
+;;; eval using the top-level (user) environment.
+(define slib:eval eval)
+
+(define *macros* '())
+(define (defmacro? m) (and (assq m *macros*) #t))
+
+(define-macro (defmacro key pattern . body)
+ `(begin
+ (define-macro ,(cons key pattern) ,@body)
+ (set! *macros* (cons (cons ',key (lambda ,pattern ,@body)) *macros*))))
+
+(define (macroexpand-1 e)
+ (if (pair? e) (let ((a (car e)))
+ (cond ((symbol? a) (set! a (assq a *macros*))
+ (if a (apply (cdr a) (cdr e)) e))
+ (else e)))
+ e))
+
+(define (macroexpand e)
+ (if (pair? e) (let ((a (car e)))
+ (cond ((symbol? a)
+ (set! a (assq a *macros*))
+ (if a (macroexpand (apply (cdr a) (cdr e))) e))
+ (else e)))
+ e))
+
+(define gentemp
+ (let ((*gensym-counter* -1))
+ (lambda ()
+ (set! *gensym-counter* (+ *gensym-counter* 1))
+ (string->symbol
+ (string-append "slib:G" (number->string *gensym-counter*))))))
+
+(define defmacro:eval slib:eval)
+(define defmacro:load load)
+;;; If your implementation provides R4RS macros:
+;(define macro:eval slib:eval)
+;(define macro:load load)
+
+(define (slib:eval-load <pathname> evl)
+ (if (not (file-exists? <pathname>))
+ (set! <pathname> (string-append <pathname> (scheme-file-suffix))))
+ (call-with-input-file <pathname>
+ (lambda (port)
+ (let ((old-load-pathname *load-pathname*))
+ (set! *load-pathname* <pathname>)
+ (do ((o (read port) (read port)))
+ ((eof-object? o))
+ (evl o))
+ (set! *load-pathname* old-load-pathname)))))
+
+;;; define an error procedure for the library
+(define slib:error error)
+
+;;; define these as appropriate for your system.
+(define slib:tab #\tab)
+(define slib:form-feed #\formfeed)
+
+;;; Define these if your implementation's syntax can support it and if
+;;; they are not already defined.
+
+;(define (1+ n) (+ n 1))
+;(define (-1+ n) (+ n -1))
+;(define 1- -1+)
+
+(define in-vicinity string-append)
+
+;;; Define SLIB:EXIT to be the implementation procedure to exit or
+;;; return if exitting not supported.
+(define slib:exit
+ (lambda args
+ (exit (cond ((null? args) 0)
+ ((eqv? #t (car args)) 0)
+ ((and (number? (car args)) (integer? (car args))) (car args))
+ (else 1)))))
+
+;;; Here for backward compatability
+(define scheme-file-suffix
+ (let ((suffix (case (software-type)
+ ((NOSVE) "_scm")
+ (else ".scm"))))
+ (lambda () suffix)))
+
+;;; (SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
+;;; suffix all the module files in SLIB have. See feature 'SOURCE.
+
+; Modify the already modified _load_ so that it copes with
+; environments correctly. The change involves using
+; _(global-environment)_ if none is explicitly specified.
+; If this is not done, definitions in files loaded by other files will
+; not be loaded in the correct environment.
+
+(define slib:load-source
+ (let ((primitive-load load))
+ (lambda (<pathname> . rest)
+ (let ((env (if (null? rest) (list (global-environment)) rest)))
+ (apply primitive-load <pathname> env)))))
+
+;;; (SLIB:LOAD-COMPILED "foo") should load the file that was produced
+;;; by compiling "foo.scm" if this implementation can compile files.
+;;; See feature 'COMPILED.
+
+(define slib:load-compiled
+ (let ((primitive-load load))
+ (lambda (<pathname> . rest)
+ (apply primitive-load (string->symbol (string-append name ".o")) rest))))
+
+;;; At this point SLIB:LOAD must be able to load SLIB files.
+
+(define slib:load slib:load-source) ;WARNING: redefining LOAD
+
+(slib:load (in-vicinity (library-vicinity) "require"))