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+;;;"scheme48.init" Initialisation for SLIB for Scheme48	-*-scheme-*-
+;;; Copyright (C) 1992, 1993, 1994, 1995 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.
+
+;;; If you know the magic incantation to make a "," command available
+;;; as a scheme procedure, you can make a nifty slib function to do
+;;; this (like `slib:dump' in "vscm.init").  But for now, type:
+;;;	make slib48
+
+;;; (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) 'Scheme48)
+
+;;; (scheme-implementation-version) should return a string describing
+;;; the version the scheme implementation loading this file.
+
+(define (scheme-implementation-version) "0.36")
+
+;;; (implementation-vicinity) should be defined to be the pathname of
+;;; the directory where any auxiliary files to your Scheme
+;;; implementation reside.
+; For scheme48, perhaps something like /usr/local/src/scheme48/misc/ ?
+
+(define (implementation-vicinity)
+  (case (software-type)
+    ((UNIX)      "=scheme48/")    ; Translated
+    (else (slib:error "unrecognized software-type" software-type))))
+
+;;; (library-vicinity) should be defined to be the pathname of the
+;;; directory where files of Scheme library functions reside.
+
+(define (library-vicinity) "/usr/local/lib/slib/")
+
+;;; *FEATURES* should be set to a list of symbols describing features
+;;; of this implementation.  See Template.scm for the list of feature
+;;; names.
+
+(define *features*
+      '(
+	source				;can load scheme source files
+					;(slib:load-source "filename")
+;	compiled			;can load compiled files
+					;(slib:load-compiled "filename")
+	rev4-report			;conforms to
+	ieee-p1178			;conforms to
+	rev4-optional-procedures
+	multiarg/and-
+	multiarg-apply
+	rationalize
+	delay				;has delay and force
+	with-file
+	char-ready?			;has
+	values				;proposed multiple values
+	eval				;slib:eval is single argument eval.
+	dynamic-wind			;proposed dynamic-wind
+	full-continuation		;can return multiple times
+	macro				;R4RS appendix's DEFINE-SYNTAX
+	))
+
+;;; (OUTPUT-PORT-WIDTH <port>)
+(define (output-port-width . arg) 79)
+
+;;; (OUTPUT-PORT-HEIGHT <port>)
+(define (output-port-height . arg) 24)
+
+;;; (CURRENT-ERROR-PORT)
+(define current-error-port
+  (access-scheme-48 'error-output-port))
+
+;;; (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)))))
+
+;;; (FILE-EXISTS? <string>)
+(define (file-exists? f) #f)
+
+;;; (DELETE-FILE <string>)
+(define (delete-file f) #f)
+
+;;; 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 . arg)
+  ((access-scheme-48 'force-output)
+   (if (null? arg) (current-output-port) (car arg))))
+
+;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
+;;; be returned by CHAR->INTEGER.
+(define integer->char (access-scheme-48 'ascii->char))
+(define char->integer
+  (let ((char->integer char->integer)
+	(code0 (char->integer (integer->char 0))))
+    (lambda (char) (- (char->integer char) code0))))
+(define char-code-limit 256)
+
+;;; Workaround MODULO bug
+(define modulo
+  (let ((modulo modulo))
+    (lambda (n1 n2)
+      (let ((ans (modulo n1 n2)))
+	(if (= ans n2) (- ans ans) ans)))))
+
+;;; MOST-POSITIVE-FIXNUM is used in modular.scm
+(define most-positive-fixnum #x1FFFFFFF)
+
+;;; 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
+  (let ((eval eval)
+	(interaction-environment interaction-environment))
+    (lambda (form)
+      (eval form (interaction-environment)))))
+
+;;; If your implementation provides R4RS macros:
+(define macro:eval slib:eval)
+(define macro:load load)
+
+(define *defmacros*
+  (list (cons 'defmacro
+	      (lambda (name parms . body)
+		`(set! *defmacros* (cons (cons ',name (lambda ,parms ,@body))
+				      *defmacros*))))))
+(define (defmacro? m) (and (assq m *defmacros*) #t))
+
+(define (macroexpand-1 e)
+  (if (pair? e) (let ((a (car e)))
+		  (cond ((symbol? a) (set! a (assq a *defmacros*))
+				     (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 *defmacros*))
+			 (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 base:eval slib:eval)
+(define (defmacro:eval x) (base:eval (defmacro:expand* x)))
+(define (defmacro:expand* x)
+  (require 'defmacroexpand) (apply defmacro:expand* x '()))
+
+(define (defmacro:load <pathname>)
+  (slib:eval-load <pathname> defmacro:eval))
+
+(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 (access-scheme-48 'error))
+
+;;; define these as appropriate for your system.
+(define slib:tab (integer->char 9))
+(define slib:form-feed (integer->char 12))
+
+;;; Support for older versions of Scheme.  Not enough code for its own file.
+(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
+(define t #t)
+(define nil #f)
+
+;;; Define these if your implementation's syntax can support them 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 #f))
+
+;;; Here for backward compatability
+(define scheme-file-suffix
+  (case (software-type)
+    ((NOSVE) (lambda () "_scm"))
+    (else (lambda () ".scm"))))
+
+;;; (SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
+;;; suffix all the module files in SLIB have.  See feature 'SOURCE.
+
+(define (slib:load-source f) (load (string-append f (scheme-file-suffix))))
+
+;;; (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 load)
+
+;;; At this point SLIB:LOAD must be able to load SLIB files.
+
+(define slib:load slib:load-source)
+
+(slib:load (in-vicinity (library-vicinity) "require"))