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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
-