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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