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+;"scheme2c.init" Initialisation for SLIB for Scheme->C on Sun	-*-scheme-*-
+;Copyright 1991, 1992, 1993 Aubrey Jaffer
+;Copyright 1991 David Love
+;
+;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.
+
+;;Modified by David Love (d.love@daresbury.ac.uk) 10/12/91
+;; NB this is for the 01nov91 (and, presumably, later ones,
+;; although those may not need the bug fixes done at the end).
+;; Earlier versions definitely aren't rev4 conformant.  Check
+;; `ieee-floating-point' and `system' in *features* for non-Sun un*x
+;; versions and `system' and the vicinity stuff (at least) for
+;; non-un*x versions.
+
+;; Of course, if you make serious use of library functions you'll want
+;; to compile them and  use Scheme->C modules.
+
+(define (software-type) 'UNIX)
+
+;;; (scheme-implementation-type) should return the name of the scheme
+;;; implementation loading this file.
+
+(define (scheme-implementation-type) 'Scheme->C)
+
+;;; (scheme-implementation-version) should return a string describing
+;;; the version the scheme implementation loading this file.
+
+(define (scheme-implementation-version) "?01nov91")
+
+(define (implementation-vicinity)
+  (case (software-type)
+    ((UNIX)	"/usr/local/lib/scheme/")
+    ((VMS)	"scheme$src:")
+    ((MS-DOS)	"C:\\scheme\\")))
+
+;;; (library-vicinity) should be defined to be the pathname of the
+;;; directory where files of Scheme library functions reside.
+
+(define library-vicinity
+  (let ((library-path
+	 (case (software-type)
+	   ((UNIX) "/usr/local/lib/slib/")
+	   ((VMS) "lib$scheme:")
+	   ((MS-DOS) "C:\\SLIB\\")
+	   (else ""))))
+    (lambda () library-path)))
+
+;;; *FEATURES* should be set to a list of symbols describing features
+;;; of this implementation.  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
+	;; Follows rev4 as far as I can tell, modulo '() being false,
+	;; number syntax (see doc), incomplete tail recursion (see
+	;; docs) and a couple of bugs in some versions -- see below.
+	rev3-report			;conforms to
+;	ieee-p1178			;conforms to
+	;; ieee conformance is ruled out by '() being false, if
+	;; nothing else.
+	rev4-optional-procedures
+	rev3-procedures
+;	rev2-procedures
+	multiarg/and-
+	multiarg-apply
+	rationalize
+	object-hash
+	delay
+	promise
+	with-file
+	transcript
+	char-ready?
+	ieee-floating-point
+	full-continuation
+	pretty-print
+	format
+	trace				;has macros: TRACE and UNTRACE
+	string-port
+	system
+	;; next two could be added easily to the interpreter
+;	getenv
+;	program-arguments
+	))
+
+(define pretty-print pp)
+
+;;; (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
+  (let ((port (current-output-port)))
+    (lambda () 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)
+  (case (software-type)
+    ((UNIX) (zero? (system (string-append "test -f " f))))
+    (else (slib:error "FILE-EXISTS? not defined for " software-type))))
+
+;;; (DELETE-FILE <string>)
+(define (delete-file f)
+  (case (software-type)
+    ((UNIX) (zero? (system (string-append "rm " f))))
+    (else (slib:error "DELETE-FILE not defined for " software-type))))
+
+;;; 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-buffer)
+
+;;; 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)		;doesn't work
+      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 536870911)
+
+;;; 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-macro defmacro
+  (lambda (f e)
+    (let ((key (cadr f)) (pattern (caddr f)) (body (cdddr f)))
+      (e `(define-macro ,key 
+	    (let ((%transformer (lambda ,pattern ,@body)))
+	      (lambda (%form %expr)
+		(%expr (apply %transformer (cdr %form)) %expr))))
+	 e))))
+
+(define (defmacro? m) (and (getprop m '*expander*) #t))
+
+(define macroexpand-1 expand-once)
+
+(define (macroexpand e)
+  (if (pair? e) (let ((a (car e)))
+		  (if (and (symbol? a) (getprop a '*expander*))
+		      (macroexpand (expand-once e))
+		      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 . args)
+  (error 'slib-error: "~a"
+	 (apply string-append
+		(map
+		 (lambda (a)
+		   (format " ~a" a))
+		 args))))
+
+;; define these as appropriate for your system.
+(define slib:tab (integer->char 9))
+(define slib:form-feed (integer->char 12))
+
+;;; bug fixes for Scheme->C (versions 28sep90, 23feb90, 01nov91):
+
+(let ((vers (substring (cadr (implementation-information)) 0 7)))
+  (if (or (string=? vers "28sep90") (string=? vers "23feb90")
+	  (string=? vers "01nov91"))
+      (begin
+	;; GCD fails with 0 as argument
+	(define old-gcd gcd)
+	(set! gcd (lambda args
+		    (apply old-gcd (remv! 0 args))))
+	
+	;; STRING->SYMBOL doesn't allocate a new string
+	(set! string->symbol
+	      (let ((fred string->symbol))
+		(lambda (a) (fred (string-append a)))))
+	
+	;; NUMBER->STRING can generate a leading #?
+	(set! number->string
+	      (let ((fred number->string))
+		(lambda (num . radix)
+		  (let ((joe (apply fred num radix)))
+		    (if (char=? #\# (string-ref joe 0))
+			(substring joe 2 (string-length joe))
+			joe)))))
+	
+	;; Another bug is bad expansion of LETREC when the body starts with a
+	;; DEFINE as shown by test.scm -- not fixed here.
+	)))
+
+(define promise:force force)
+
+;;; (implementation-vicinity) should be defined to be the pathname of
+;;; the directory where any auxillary files to your Scheme
+;;; implementation reside.
+
+(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)))
+
+;;; 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.
+
+(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"))
+; eof