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-rw-r--r--scheme48.init85
1 files changed, 65 insertions, 20 deletions
diff --git a/scheme48.init b/scheme48.init
index 75ab0f5..0640120 100644
--- a/scheme48.init
+++ b/scheme48.init
@@ -38,23 +38,19 @@
;;; (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-home-page) should return a (string) URI
;;; (Uniform Resource Identifier) for this scheme implementation's home
;;; page; or false if there isn't one.
-
(define (scheme-implementation-home-page) "http://s48.org/")
;;; (scheme-implementation-version) should return a string describing
;;; the version of the scheme implementation loading this file.
-
(define scheme-implementation-version
(let ((version (getenv "S48_VERSION")))
(lambda () version)))
@@ -62,14 +58,12 @@
;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxiliary files to your Scheme
;;; implementation reside.
-
(define implementation-vicinity
(let ((vic (getenv "S48_VICINITY")))
(lambda () vic)))
;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.
-
(define library-vicinity
(let ((vic (getenv "SCHEME_LIBRARY_PATH")))
(lambda () vic)))
@@ -77,10 +71,15 @@
;;; (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)))
+(define (home-vicinity)
+ (let ((home (getenv "HOME")))
+ (and home
+ (case (software-type)
+ ((UNIX COHERENT MS-DOS) ;V7 unix has a / on HOME
+ (if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
+ home
+ (string-append home "/")))
+ (else home)))))
(let* ((siv (scheme-implementation-version))
(num-ver (and siv (string->number siv))))
@@ -91,7 +90,6 @@
;;; *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
@@ -101,7 +99,7 @@
;; Scheme report features
- rev5-report ;conforms to
+ r5rs ;conforms to
eval ;R5RS two-argument eval
values ;R5RS multiple values
dynamic-wind ;R5RS dynamic-wind
@@ -115,11 +113,11 @@
;STRING-FILL!, LIST->VECTOR,
;VECTOR->LIST, and VECTOR-FILL!
- rev4-report ;conforms to
+ r4rs ;conforms to
ieee-p1178 ;conforms to
-; rev3-report ;conforms to
+; r3rs ;conforms to
; rev2-procedures ;SUBSTRING-MOVE-LEFT!,
;SUBSTRING-MOVE-RIGHT!,
@@ -130,7 +128,7 @@
; multiarg/and- ;/ and - can take more than 2 args.
with-file ;has WITH-INPUT-FROM-FILE and
- ;WITH-OUTPUT-FROM-FILE
+ ;WITH-OUTPUT-TO-FILE
; transcript ;TRANSCRIPT-ON and TRANSCRIPT-OFF
; ieee-floating-point ;conforms to IEEE Standard 754-1985
;IEEE Standard for Binary
@@ -200,6 +198,37 @@
(s48-force-output
(if (null? arg) (current-output-port) (car arg))))
+(define (make-exchanger obj)
+ (lambda (rep) (let ((old obj)) (set! obj rep) old)))
+(define (open-file filename modes)
+ (case modes
+ ((r rb) (open-input-file filename))
+ ((w wb) (open-output-file filename))
+ (else (slib:error 'open-file 'mode? modes))))
+(define (port? obj) (or (input-port? port) (output-port? port)))
+(define (call-with-open-ports . ports)
+ (define proc (car ports))
+ (cond ((procedure? proc) (set! ports (cdr ports)))
+ (else (set! ports (reverse ports))
+ (set! proc (car ports))
+ (set! ports (reverse (cdr ports)))))
+ (let ((ans (apply proc ports)))
+ (for-each close-port ports)
+ ans))
+(define (close-port port)
+ (cond ((input-port? port)
+ (close-input-port port)
+ (if (output-port? port) (close-output-port port)))
+ ((output-port? port) (close-output-port port))
+ (else (slib:error 'close-port 'port? port))))
+
+(define (browse-url url)
+ (define (try cmd) (eqv? 0 (system (sprintf #f cmd url))))
+ (or (try "netscape-remote -remote 'openURL(%s)'")
+ (try "netscape -remote 'openURL(%s)'")
+ (try "netscape '%s'&")
+ (try "netscape '%s'")))
+
;;; "rationalize" adjunct procedures.
(define (find-ratio x e)
(let ((rat (rationalize x e)))
@@ -227,12 +256,24 @@
(define two-arg:atan atan)
(define (atan y . x)
(if (null? x) (two-arg:atan y 1) (two-arg:atan y (car x))))
+;;; asin is totally busted
+(define (asin y) (two-arg:atan y (sqrt (- 1 (* y y)))))
+
+;;; Workaround inexact->exact and exact->inexact bugs.
+(define inexact->exact
+ (let ((i->e inexact->exact))
+ (lambda (z)
+ (if (exact? z) z (i->e z)))))
+(define exact->inexact
+ (let ((e->i exact->inexact))
+ (lambda (z)
+ (if (inexact? z) z (e->i z)))))
;;; MOST-POSITIVE-FIXNUM is used in modular.scm
(define most-positive-fixnum #x1FFFFFFF)
;;; Return argument
-(define (identity x) x)
+(define identity values)
;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
(define slib:eval
@@ -301,7 +342,13 @@
(let ((cep (current-error-port)))
(if (provided? 'trace) (print-call-stack cep))
(display "Warn: " cep)
- (for-each (lambda (x) (display x cep)) args))))
+ (write (car args) cep)
+ (newline cep)
+ (for-each (lambda (x)
+ (display " " cep)
+ (write x cep)
+ (newline cep))
+ (cdr args)))))
;;; define an error procedure for the library
(define (slib:error . args)
@@ -344,11 +391,9 @@
;;; (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)
;;; Scheme48 complains that these are not defined (even though they
@@ -384,5 +429,5 @@
,collect
,batch off
-,dump slib.image "(slib 2d2)"
+,dump slib.image "(slib 3a1)"
,exit