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;;; "scheme2c.init" Initialisation for SLIB for Scheme->C on Sun -*-scheme-*-
;;; Authors: David Love and Aubrey Jaffer
;;;
;;; This code is in the public domain.
;;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-home-page) should return a (string) URL
;;; (Uniform Resource Locator) for this scheme implementation's home
;;; page; or false if there isn't one.
(define (scheme-implementation-home-page) #f)
;;; (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)))
;;; (home-vicinity) should return the vicinity of the user's HOME
;;; directory, the directory which typically contains files which
;;; customize a computer environment for a user.
(define home-vicinity
(let ((home-path (getenv "HOME")))
(lambda () home-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)
;;; 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 slib:warn
(lambda args
(let ((port (current-error-port)))
(display "Warn: " port)
(for-each (lambda (x) (display x port)) args))))
;; 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
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