path: root/Init5d9.scm

;; Copyright (C) 1991-2002 Free Software Foundation, Inc.
;;
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this software; see the file COPYING.  If not, write to
;; the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111, USA.
;;
;; As a special exception, the Free Software Foundation gives permission
;; for additional uses of the text contained in its release of SCM.
;;
;; The exception is that, if you link the SCM library with other files
;; to produce an executable, this does not by itself cause the
;; resulting executable to be covered by the GNU General Public License.
;; Your use of that executable is in no way restricted on account of
;; linking the SCM library code into it.
;;
;; This exception does not however invalidate any other reasons why
;; the executable file might be covered by the GNU General Public License.
;;
;; This exception applies only to the code released by the
;; Free Software Foundation under the name SCM.  If you copy
;; code from other Free Software Foundation releases into a copy of
;; SCM, as the General Public License permits, the exception does
;; not apply to the code that you add in this way.  To avoid misleading
;; anyone as to the status of such modified files, you must delete
;; this exception notice from them.
;;
;; If you write modifications of your own for SCM, it is your choice
;; whether to permit this exception to apply to your modifications.
;; If you do not wish that, delete this exception notice.

;;;; "Init.scm", Scheme initialization code for SCM.
;;; Author: Aubrey Jaffer.

(define (scheme-implementation-type) 'SCM)
(define (scheme-implementation-version) "5d9")
(define (scheme-implementation-home-page)
  "http://swissnet.ai.mit.edu/~jaffer/SCM")

(define in-vicinity string-append)

(set! *features*
      (append '(ed getenv tmpnam abort transcript with-file
		   ieee-p1178 rev4-report rev4-optional-procedures
		   hash object-hash delay dynamic-wind fluid-let
		   multiarg-apply multiarg/and- logical defmacro
		   string-port source current-time sharp:semi)
	      *features*))

(define eval
  (let ((@eval @eval)
	(@copy-tree @copy-tree))
    (lambda (x) (@eval (@copy-tree x)))))

(define (exec-self)
  (require 'i/o-extensions)
  (execv (execpath) (if *script*
			(cons (car (program-arguments))
			      (cons "\\"
				    (member *script* (program-arguments))))
			(program-arguments))))

(define (display-file file . port)
  (call-with-input-file file
    (lambda (inport)
      (do ((c (read-char inport) (read-char inport)))
	  ((eof-object? c))
	(apply write-char c port)))))
(define (terms)
  (display-file (in-vicinity (implementation-vicinity) "COPYING")))

(define (read:try-number port . ic)
  (define chr0 (char->integer #\0))
  (let loop ((arg (and (not (null? ic)) (- (char->integer (car ic)) chr0))))
    (let ((c (peek-char port)))
      (cond ((eof-object? c) #f)
	    ((char-numeric? c)
	     (loop (+ (* 10 (or arg 0))
		      (- (char->integer (read-char port)) chr0))))
	    (else arg)))))

(define (read:array rank port read)
  (define (bomb pc wid)
    (error (string-append "array syntax? #"
			  (number->string rank)
			  "A" (string pc)
			  (if wid (number->string wid) ""))))
  (list->uniform-array
   rank
   (case (char-downcase (peek-char port))
     ((#\\) (read-char port) #\a)
     ((#\t) (read-char port) #t)
     ((#\c #\r)
      (let* ((pc (read-char port))
	     (wid (read:try-number port)))
	(case wid
	  ((64 32) (case pc
		     ((#\c) (* +i wid))
		     (else (exact->inexact wid))))
	  (else (bomb pc wid)))))
     ((#\s #\u)
      (let* ((pc (read-char port))
	     (wid (read:try-number port)))
	(case (or wid (peek-char port))
	  ((32 16 8) (case pc
		       ((#\s) (- wid))
		       (else wid)))
	  ((#\s #\f #\d #\l) (read-char port) 32)
	  ((#\() 32)			;legacy
	  (else (bomb pc wid)))))
     ((#\e)				;legacy
      (read-char port)
      (case (char-downcase (peek-char port))
	((#\s) (read-char port) -16)
	((#\f #\d #\l) (read-char port) -32)
	(else -32)))
     ((#\i)				;legacy
      (read-char port)
      (case (char-downcase (peek-char port))
	((#\c)
	 (read-char port)
	 (case (char-downcase (peek-char port))
	   ((#\s #\f #\d #\l) (read-char port)))
	 +64i)
	((#\s #\f) (read-char port) 32.0)
	((#\d #\l) (read-char port) 64.0)
	(else (bomb (read-char port) #f))))
     (else #f))
   (read port)))

;;; read-macros valid only in LOAD.
(define (load:sharp c port read)
  (case c
    ((#\') (read port))
    ((#\.) (eval (read port)))
    ((#\!) (let skip ((metarg? #f))
	     (let ((c (read-char port)))
	       (case c
		 ((#\newline) (if metarg? (skip #t)))
		 ((#\\) (skip #t))
		 ((#\!) (cond ((eqv? #\# (peek-char port))
			       (read-char port)
			       (if #f #f))
			      (else (skip metarg?))))
		 (else (if (char? c) (skip metarg?) c))))))
    ;; Make #; convert the rest of the line to a (comment ...) form.
    ;; "build.scm" uses this.
    ((#\;) (let skip-semi ()
	     (cond ((eqv? #\; (peek-char port))
		    (read-char port)
		    (skip-semi))
		   (else (require 'line-i/o)
			 `(comment ,(read-line port))))))
    ((#\?) (case (read port)
	     ((line) (port-line port))
	     ((column) (port-column port))
	     ((file) (port-filename port))
	     (else #f)))
    (else (read:sharp c port read))))

;;; read-macros valid for LOAD and READ.
(define (read:sharp c port read)
  (case c
    ;; Used in "implcat" and "slibcat"
    ((#\+) (if (slib:provided? (read port))
	       (read port)
	       (begin (read port) (if #f #f))))
    ;; Used in "implcat" and "slibcat"
    ((#\-) (if (slib:provided? (read port))
	       (begin (read port) (if #f #f))
	       (read port)))
    ((#\a #\A) (read:array 1 port read))
    ((#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9)
     (let* ((num (read:try-number port c))
	    (c (peek-char port)))
       (cond ((memv c '(#\a #\A)) (read-char port) (read:array num port read))
	     (else (error "syntax? #" num c)))))
    (else (error "unknown # object" c))))

;;; We can assume TOK has at least 2 characters.
(define char:sharp
  (letrec ((numeric-1
            (lambda (tok radix)
              (numeric (substring tok 1 (string-length tok)) radix)))
           (numeric
            (lambda (tok radix)
              (cond ((string->number tok radix) => integer->char))))
           (compose
	    (lambda (modifier tok)
	      (and (char=? #\- (string-ref tok 1))
		   (if (= 3 (string-length tok))
		       (modifier (string-ref tok 2))
		       (let ((c (char:sharp
				 (substring tok 2 (string-length tok)))))
			 (and c (modifier c)))))))
	   (control
	    (lambda (c)
	      (and (char? c)
		   (if (eqv? c #\?)
		       (integer->char 127)
		       (integer->char (logand #o237 (char->integer c)))))))
	   (meta
	    (lambda (c)
	      (and (char? c)
		   (integer->char (logior 128 (char->integer c)))))))
    (lambda (tok)
      (case (string-ref tok 0)
        ((#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7) (numeric tok 8))
        ((#\O #\o) (numeric-1 tok 8))
        ((#\D #\d) (numeric-1 tok 10))
        ((#\X #\x) (numeric-1 tok 16))
	((#\C #\c) (compose control tok))
	((#\^) (and (= 2 (string-length tok)) (control (string-ref tok 1))))
	((#\M #\m) (compose meta tok))))))

;;;; Function used to accumulate comments before a definition.
(define comment
  (let ((*accumulated-comments* '()))
    (lambda args
      (cond ((null? args)
	     (let ((ans
		    (apply string-append
			   (map (lambda (comment)
				  (string-append (or comment "") "\n"))
				(reverse *accumulated-comments*)))))
	       (set! *accumulated-comments* '())
 	       (if (equal? "" ans)
		   "no-comment"	;#f
		   (substring ans 0 (+ -1 (string-length ans))))))
	    (else (set! *accumulated-comments*
			(append (reverse args) *accumulated-comments*)))))))

(define : ':)				;for /bin/sh hack.
(define !#(if #f #f))			;for scsh hack.

;;;; Here are some Revised^2 Scheme functions:
(define 1+ (let ((+ +)) (lambda (n) (+ n 1))))
(define -1+ (let ((+ +)) (lambda (n) (+ n -1))))
(define 1- -1+)
(define <? <)
(define <=? <=)
(define =? =)
(define >? >)
(define >=? >=)
(define t #t)
(define nil #f)
(define identity cr)

(cond ((defined? defsyntax)
(defsyntax define-syntax (the-macro defsyntax)))
      (else
(define defsyntax define)
(define the-macro identity)))
(defsyntax sequence (the-macro begin))
(define copy-tree @copy-tree)

;;; VMS does something strange when output is sent to both
;;; CURRENT-OUTPUT-PORT and CURRENT-ERROR-PORT.
(case (software-type) ((VMS) (set-current-error-port (current-output-port))))

;;; OPEN_READ, OPEN_WRITE, and OPEN_BOTH are used to request the proper
;;; mode to open files in.  MS-DOS does carriage return - newline
;;; translation if not opened in `b' mode.

(define OPEN_READ (case (software-type)
		    ((MS-DOS WINDOWS ATARIST) 'rb)
		    (else 'r)))
(define OPEN_WRITE (case (software-type)
		     ((MS-DOS WINDOWS) 'wbc)
		     ((ATARIST) 'wb)
		     (else 'w)))
(define OPEN_BOTH (case (software-type)
		    ((MS-DOS WINDOWS) 'r+bc)
		    ((ATARIST) 'r+b)
		    (else 'r+)))
(define ((make-moder str) mode)
  (if (symbol? mode)
      (string->symbol (string-append (symbol->string mode) str))
      (string-append mode str)))
(define _IONBF (make-moder "0"))
(define _TRACKED (make-moder "?"))
(define _EXCLUSIVE (make-moder "x"))

(define could-not-open #f)

(define (open-output-file str)
  (or (open-file str OPEN_WRITE)
      (and (procedure? could-not-open) (could-not-open) #f)
      (error "OPEN-OUTPUT-FILE couldn't open file " str)))
(define (open-input-file str)
  (or (open-file str OPEN_READ)
      (and (procedure? could-not-open) (could-not-open) #f)
      (error "OPEN-INPUT-FILE couldn't open file " str)))

(define (string-index str chr)
  (define len (string-length str))
  (do ((pos 0 (+ 1 pos)))
      ((or (>= pos len) (char=? chr (string-ref str pos)))
       (and (< pos len) pos))))

(if (not (defined? try-create-file))
(define (try-create-file str modes . perms)
  (if (symbol? modes) (set! modes (symbol->string modes)))
  (let ((idx (string-index modes #\x)))
    (cond ((slib:in-catalog? 'i/o-extensions)
	   (require 'i/o-extensions)
	   (apply try-create-file str modes perms))
	  ((not idx)
	   (warn "not exclusive modes?" modes str)
	   (try-open-file str modes))
	  (else (set! modes (string-append (substring modes 0 idx)
					   (substring modes (+ 1 idx)
						      (string-length modes))))
		(cond ((not (string-index modes #\w))
		       (warn 'try-create-file "not writing?" modes str)
		       (try-open-file str modes))
		      (else
		       (cond ((and (not (null? perms))
				   (not (eqv? #o666 (car perms))))
			      (warn "perms?" (car perms) str)))
		       (cond ((file-exists? str) #f)
			     (else (try-open-file str modes))))))))))

(define close-input-port close-port)
(define close-output-port close-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 (call-with-input-file str proc)
  (call-with-open-ports (open-input-file str) proc))

(define (call-with-output-file str proc)
  (call-with-open-ports (open-output-file str) proc))

(define (with-input-from-port port thunk)
  (dynamic-wind (lambda () (set! port (set-current-input-port port)))
		thunk
		(lambda () (set! port (set-current-input-port port)))))

(define (with-output-to-port port thunk)
  (dynamic-wind (lambda () (set! port (set-current-output-port port)))
		thunk
		(lambda () (set! port (set-current-output-port port)))))

(define (with-error-to-port port thunk)
  (dynamic-wind (lambda () (set! port (set-current-error-port port)))
		thunk
		(lambda () (set! port (set-current-error-port port)))))

(define (with-input-from-file file thunk)
  (let* ((nport (open-input-file file))
	 (ans (with-input-from-port nport thunk)))
    (close-port nport)
    ans))

(define (with-output-to-file file thunk)
  (let* ((nport (open-output-file file))
	 (ans (with-output-to-port nport thunk)))
    (close-port nport)
    ans))

(define (with-error-to-file file thunk)
  (let* ((nport (open-output-file file))
	 (ans (with-error-to-port nport thunk)))
    (close-port nport)
    ans))

(define (call-with-outputs thunk proc)
  (define stdout #f)
  (define stderr #f)
  (define status #f)
  (set! stdout
	(call-with-output-string
	 (lambda (stdout)
	   (set! stderr
		 (call-with-output-string
		  (lambda (stderr)
		    (call-with-current-continuation
		     (lambda (escape)
		       (dynamic-wind
			   (lambda ()
			     (set! status #f)
			     (set! stdout (set-current-output-port stdout))
			     (set! stderr (set-current-error-port stderr)))
			   (lambda () (set! status (list (thunk))))
			   (lambda ()
			     (set! stdout (set-current-output-port stdout))
			     (set! stderr (set-current-error-port stderr))
			     (if (not status) (escape #f))))))))))))
  (apply proc stdout stderr (or status '())))

(define browse-url
  (case (software-type)
    ((UNIX COHERENT PLAN9)
     (lambda (url)
       (define (try cmd end) (zero? (system (string-append cmd url end))))
       (or (try "netscape-remote -remote 'openURL(" ")'")
	   (try "netscape -remote 'openURL(" ")'")
	   (try "netscape '" "'&")
	   (try "netscape '" "'"))))
    (else
     (lambda (url)
       (slib:warn 'define (software-type) 'case 'of 'browse-url 'in
		  *load-pathname*)))))

(define (warn . args)
  (define cep (current-error-port))
  (if (defined? print-call-stack) (print-call-stack cep))
  (perror "WARN")
  (errno 0)
  (display "WARN:" cep)
  (for-each (lambda (x) (display #\  cep) (write x cep)) args)
  (newline cep)
  (force-output cep))

(define (error . args)
  (define cep (current-error-port))
  (if (defined? print-call-stack) (print-call-stack cep))
  (perror "ERROR")
  (errno 0)
  (display "ERROR:" cep)
  (for-each (lambda (x) (display #\  cep) (write x cep)) args)
  (newline cep)
  (force-output cep)
  (abort))

(define set-errno errno)
(define slib:exit quit)
(define exit quit)

(define (print . args)
  (define result #f)
  (for-each (lambda (x) (set! result x) (write x) (display #\ )) args)
  (newline)
  result)
(define (pprint . args)
  (define result #f)
  (for-each (lambda (x) (set! result x) (pretty-print x)) args)
  result)
(define (pp . args)
  (for-each pretty-print args)
  (if #f #f))

(if (not (defined? file-exists?))
(define (file-exists? str)
  (let ((port (open-file str OPEN_READ)))
    (errno 0)
    (and port (close-port port) #t))))
(define (file-readable? str)
  (let ((port (open-file str OPEN_READ)))
    (errno 0)
    (and port
	 (char-ready? port)
	 (do ((c (read-char port)
		 (and (char-ready? port) (read-char port)))
	      (i 0 (+ 1 i))
	      (l '() (cons c l)))
	     ((or (not c) (eof-object? c) (<= 2 i))
	      (if (null? l) #f (list->string (reverse l))))))))

(define difftime -)
(define offset-time +)

(if (not (defined? ed))
(define (ed . args)
  (system (apply string-append
		 (or (getenv "EDITOR") "ed")
		 (map (lambda (s) (string-append " " s)) args)))))

(if (not (defined? output-port-width))
(define (output-port-width . arg) 80))

(if (not (defined? output-port-height))
(define (output-port-height . arg) 24))

(if (not (defined? last-pair))
(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l)))

(define slib:error error)
(define slib:warn warn)
(define slib:tab #\tab)
(define slib:form-feed #\page)
(define slib:eval eval)

(define (make-exchanger . pair) (lambda (rep) (swap-car! pair rep)))

;;;; Load.
(define load:indent 0)
(define (load:pre file)
  (define cep (current-error-port))
  (cond ((> (verbose) 1)
	 (display
	  (string-append ";" (make-string load:indent #\ ) "loading " file)
	  cep)
	 (set! load:indent (modulo (+ 2 load:indent) 16))
	 (newline cep)))
  (force-output cep))

(define (load:post filesuf)
  (define cep (current-error-port))
  (errno 0)
  (cond ((> (verbose) 1)
	 (set! load:indent (modulo (+ -2 load:indent) 16))
	 (display (string-append ";" (make-string load:indent #\ )
				 "done loading " filesuf)
		  cep)
	 (newline cep)
	 (force-output cep))))

;;; Here for backward compatibility
(define scheme-file-suffix
  (case (software-type)
    ((NOSVE) (lambda () "_scm"))
    (else (lambda () ".scm"))))

(define (has-suffix? str suffix)
  (let ((sufl (string-length suffix))
	(sl (string-length str)))
    (and (> sl sufl)
	 (string=? (substring str (- sl sufl) sl) suffix))))

(define *load-reader* #f)
(define (scm:load file . libs)
  (define filesuf file)
  (define hss (has-suffix? file (scheme-file-suffix)))
  (load:pre file)
  (or (and (defined? link:link) (not hss)
	   (or (let ((s2 (file-readable? file)))
		 (and s2 (not (equal? "#!" s2)) (apply link:link file libs)))
	       (and link:able-suffix
		    (let* ((fs (string-append file link:able-suffix))
			   (fs2 (file-readable? fs)))
		      (and fs2 (apply link:link fs libs) (set! filesuf fs) #t)
		      ))))
      (and (null? libs) (try-load file *load-reader*))
      ;;HERE is where the suffix gets specified
      (and (not hss) (errno 0)		; clean up error from TRY-LOAD above
	   (set! filesuf (string-append file (scheme-file-suffix)))
	   (try-load filesuf *load-reader*))
      (and (procedure? could-not-open) (could-not-open) #f)
      (begin (set! load:indent 0)
	     (error "LOAD couldn't find file " file)))
  (load:post filesuf))
(define load scm:load)
(define slib:load load)

(define (scm:load-source file)
  (define sfs (scheme-file-suffix))
  (define filesuf file)
  (load:pre file)
  (or (and (or (try-load file *load-reader*)
	       ;;HERE is where the suffix gets specified
	       (and (not (has-suffix? file sfs))
		    (begin (set! filesuf (string-append file sfs))
			   (try-load filesuf *load-reader*)))))
      (and (procedure? could-not-open) (could-not-open) #f)
      (error "LOAD couldn't find file " file))
  (load:post filesuf))
(define slib:load-source scm:load-source)

;;; This is the vicinity where this file resides.
(define implementation-vicinity #f)

;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.
(define library-vicinity #f)

;;; (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 #f)

(define (login->home-directory login)
  (cond ((defined? getpw)
	 (let ((pwvect (getpw login)))
	   (and pwvect (vector-ref pwvect 5))))
	((not (file-exists? "/etc/passwd")) #f)
	(else
	 (call-with-input-file "/etc/passwd"
	   (lambda (iprt)
	     (require 'string-search)
	     (require 'line-i/o)
	     (let tryline ()
	       (define line (read-line iprt))
	       (define (get-field)
		 (define idx (string-index line #\:))
		 (and idx
		      (let ((fld (substring line 0 idx)))
			(set! line (substring line (+ 1 idx)
					      (string-length line)))
			fld)))
	       (cond ((eof-object? line) #f)
		     ((string-index line #\:)
		      => (lambda (idx)
			   (define name (substring line 0 idx))
			   (cond ((equal? login name)
				  (do ((ans (get-field) (get-field))
				       (cnt 4 (+ -1 cnt)))
				      ((or (negative? cnt) (not ans)) ans)))
				 (else (tryline))))))))))))

(define (getlogin) (or (getenv "USER") (getenv "LOGNAME")))

;;; If the environment variable SCHEME_LIBRARY_PATH is undefined, use
;;; (implementation-vicinity) as (library-vicinity).  "require.scm",
;;; the first file loaded from (library-vicinity), can redirect it.
(define (set-vicinities! init-file)
  (set! implementation-vicinity
	(let ((vic (substring
		    init-file
		    0
		    (- (string-length init-file)
		       (string-length "Init.scm")
		       (string-length (scheme-implementation-version))))))
	  (lambda () vic)))
  (let ((library-path (getenv "SCHEME_LIBRARY_PATH")))
    (if library-path
	(set! library-vicinity (lambda () library-path))
	(let ((filename (in-vicinity (implementation-vicinity) "require.scm")))
	  (or (try-load filename)
	      (try-load (in-vicinity (implementation-vicinity) "requires.scm"))
	      (error "Can't load" filename))
	  (if (not library-vicinity) (error "Can't find library-vicinity")))))
  (set! home-vicinity
	(let ((home (getenv "HOME")))
	  (and (not home) login->home-directory
	       (let ((login (getlogin)))
		 (and login (set! home (login->home-directory login)))))
	  (and home
	       (case (software-type)
		 ((UNIX COHERENT PLAN9 MS-DOS) ;V7 unix has a / on HOME
		  (if (not
		       (eqv? #\/ (string-ref home (+ -1 (string-length home)))))
		      (set! home (string-append home "/"))))))
	  (lambda () home))))
;;; SET-VICINITIES! is also called from BOOT-TAIL
(set-vicinities! *load-pathname*)

;;;; Initialize SLIB
(load (in-vicinity (library-vicinity) "require"))

;;; This enables line-numbering for SLIB loads.
(define *slib-load-reader* (and (defined? read-numbered) read-numbered))

;;; DO NOT MOVE!  SLIB:LOAD-SOURCE and SLIB:LOAD must be defined after
;;; "require.scm" is loaded.
(define (slib:load-source file . libs)
  (fluid-let ((*load-reader* *slib-load-reader*))
    (apply scm:load file libs)))
(define slib:load slib:load-source)

;;; Legacy grease
(if (not (defined? slib:in-catalog?))
    (define slib:in-catalog? require:feature->path))

;;; Dynamic link-loading
(cond ((or (defined? dyn:link)
	   (defined? vms:dynamic-link-call))
       (load (in-vicinity (implementation-vicinity) "Link"))))

(cond ((defined? link:link)
(define (slib:load-compiled . args)
  (cond ((symbol? (car args))
	 (require (car args))
	 (apply slib:load-compiled (cdr args)))
	((apply link:link args))
	(else (error "Couldn't link files " args))))
(provide 'compiled)))

;;; Complete the function set for feature STRING-CASE.
(cond
 ((defined? string-upcase!)
(define (string-upcase str) (string-upcase! (string-copy str)))
(define (string-downcase str) (string-downcase! (string-copy str)))
(define (string-capitalize str) (string-capitalize! (string-copy str)))
(define string-ci->symbol
  (let ((s2cis (if (equal? "x" (symbol->string 'x))
		   string-downcase string-upcase)))
    (lambda (str) (string->symbol (s2cis str)))))
(define symbol-append
  (let ((s2cis (if (equal? "x" (symbol->string 'x))
		   string-downcase string-upcase)))
    (lambda args
      (string->symbol
       (apply string-append
	      (map
	       (lambda (obj)
		 (cond ((string? obj) (s2cis obj))
		       ((number? obj) (s2cis (number->string obj)))
		       ((symbol? obj) (symbol->string obj))
		       ((not obj) "")
		       (else (slib:error 'wrong-type-to 'symbol-append obj))))
	       args))))))
(define (StudlyCapsExpand nstr . delimitr)
  (set! delimitr
	(cond ((null? delimitr) "-")
	      ((char? (car delimitr)) (string (car delimitr)))
	      (else (car delimitr))))
  (do ((idx (+ -1 (string-length nstr)) (+ -1 idx)))
      ((> 1 idx) nstr)
    (cond ((and (> idx 1)
		(char-upper-case? (string-ref nstr (+ -1 idx)))
		(char-lower-case? (string-ref nstr idx)))
	   (set! nstr
		 (string-append (substring nstr 0 (+ -1 idx))
				delimitr
				(substring nstr (+ -1 idx)
					   (string-length nstr)))))
	  ((and (char-lower-case? (string-ref nstr (+ -1 idx)))
		(char-upper-case? (string-ref nstr idx)))
	   (set! nstr
		 (string-append (substring nstr 0 idx)
				delimitr
				(substring nstr idx
					   (string-length nstr))))))))
(provide 'string-case)))

;;;; Bit order and lamination

(define (logical:ones deg)
  (if (zero? deg) 0 (+ (* 2 (+ -1 (integer-expt 2 (- deg 1)))) 1)))

(define (rotate k count len)
  (set! count (modulo count len))
  (logior (logand (ash k count) (logical:ones len))
	  (ash k (- count len))))
(define logical:rotate rotate)

(define (bit-reverse k n)
  (do ((m (if (negative? n) (lognot n) n) (ash m -1))
       (k (+ -1 k) (+ -1 k))
       (rvs 0 (logior (ash rvs 1) (logand 1 m))))
      ((negative? k) (if (negative? n) (lognot rvs) rvs))))

(define (integer->list k . len)
  (if (null? len)
      (do ((k k (ash k -1))
	   (lst '() (cons (odd? k) lst)))
	  ((<= k 0) lst))
      (do ((idx (+ -1 (car len)) (+ -1 idx))
	   (k k (ash k -1))
	   (lst '() (cons (odd? k) lst)))
	  ((negative? idx) lst))))

(define (list->integer bools)
  (do ((bs bools (cdr bs))
       (acc 0 (+ acc acc (if (car bs) 1 0))))
      ((null? bs) acc)))
(define (booleans->integer . bools)
  (list->integer bools))

(define (bitwise:laminate . ks)
  (define nks (length ks))
  (define nbs (apply max (map integer-length ks)))
  (do ((kdx (+ -1 nbs) (+ -1 kdx))
       (ibs 0 (+ (list->integer (map (lambda (k) (logbit? kdx k)) ks))
		 (ash ibs nks))))
      ((negative? kdx) ibs)))

(define (bitwise:delaminate count k)
  (define nbs (* count (+ 1 (quotient (integer-length k) count))))
  (do ((kdx (- nbs count) (- kdx count))
       (lst (vector->list (make-vector count 0))
	    (map (lambda (k bool) (+ (if bool 1 0) (ash k 1)))
		 lst
		 (integer->list (ash k (- kdx)) count))))
      ((negative? kdx) lst)))

;;;; Gray-code

(define (integer->gray-code k)
  (logxor k (ash k -1)))

(define (gray-code->integer k)
  (if (negative? k)
      (error 'gray-code->integer 'negative? k)
      (let ((kln (integer-length k)))
	(do ((d 1 (* d 2))
	     (ans (logxor k (ash k -1))	; == (integer->gray-code k)
		  (logxor ans (ash ans (* d -2)))))
	    ((>= (* 2 d) kln) ans)))))

(define (grayter k1 k2)
  (define kl1 (integer-length k1))
  (define kl2 (integer-length k2))
  (if (eqv? kl1 kl2)
      (> (gray-code->integer k1) (gray-code->integer k2))
      (> kl1 kl2)))

(define (gray-code<? k1 k2)
  (not (or (eqv? k1 k2) (grayter k1 k2))))
(define (gray-code<=? k1 k2)
  (or (eqv? k1 k2) (not (grayter k1 k2))))
(define (gray-code>? k1 k2)
  (and (not (eqv? k1 k2)) (grayter k1 k2)))
(define (gray-code>=? k1 k2)
  (or (eqv? k1 k2) (grayter k1 k2)))

(define @case-aux
  (let ((integer-jump-table 1)
	(char-jump-table 2))
    (lambda (keys actions else-action)
      (let ((n (length keys)))
	(define (every-key pred)
	  (let test ((keys keys))
	    (or (null? keys)
		(and (pred (car keys)) (test (cdr keys))))))
	(define (jump-table keys)
	  (let ((minkey (apply min keys))
		(maxkey (apply max keys)))
	    (and (< (- maxkey minkey) (* 4 n))
		 (let ((actv (make-vector
			      (+ 2 (- maxkey minkey)) else-action)))
		   (for-each
		    (lambda (key action)
		      (vector-set! actv (+ 1 (- key minkey)) action))
		    keys actions)
		   (list integer-jump-table minkey actv)))))
	(cond ((< n 5) #f)
	      ((every-key integer?)
	       (jump-table keys))
	      ((every-key char?)
	       (let* ((int-keys (map char->integer keys)))
		 (cond ((jump-table int-keys) =>
			(lambda (x)
			  (cons char-jump-table
				(cons (integer->char (cadr x))
				      (cddr x)))))
		       (else #f)))))))))

;;;defmacro from dorai@cs.rice.edu (heavily hacked by jaffer):
(define *defmacros* '())
(define (defmacro? m) (and (assq m *defmacros*) #t))

(define defmacro:transformer
  (lambda (f)
    (procedure->memoizing-macro
     (lambda (exp env)
       (@copy-tree (apply f (remove-line-numbers! (cdr exp))))))))

(define defmacro:get-destructuring-bind-pairs
  (lambda (s e)
    (let loop ((s s) (e e) (r '()))
      (cond ((pair? s)
	     (loop (car s) `(car ,e)
		   (loop (cdr s) `(cdr ,e) r)))
	    ((null? s) r)
	    ((symbol? s) (cons `(,s ,e) r))
	    (else (error 'destructuring-bind "illegal syntax"))))))

(defsyntax destructuring-bind
  (let ((destructuring-bind-transformer
	 (lambda (s x . ff)
	   (let ((tmp (gentemp)))
	     `(let ((,tmp ,x))
		(let ,(defmacro:get-destructuring-bind-pairs s tmp)
		  ,@ff))))))
    (set! *defmacros*
	  (acons 'destructuring-bind
		 destructuring-bind-transformer *defmacros*))
    (defmacro:transformer destructuring-bind-transformer)))

(defsyntax defmacro:simple-defmacro
  (let ((defmacro-transformer
	  (lambda (name parms . body)
	    `(defsyntax ,name
	       (let ((transformer (lambda ,parms ,@body)))
		 (set! *defmacros* (acons ',name transformer *defmacros*))
		 (defmacro:transformer transformer))))))
    (set! *defmacros* (acons 'defmacro defmacro-transformer *defmacros*))
    (defmacro:transformer defmacro-transformer)))

(defmacro:simple-defmacro defmacro (name . body)
  (define (expn name pattern body)
    (let ((args (gentemp)))
      `(defmacro:simple-defmacro ,name ,args
	 (destructuring-bind ,pattern ,args ,@body))))
  (if (pair? name)
      (expn (car name) (cdr name) body)
      (expn name (car body) (cdr body))))

(define (macroexpand-1 e)
  (if (pair? e) (let ((a (car e)))
		  (cond ((symbol? a) (set! a (assq a *defmacros*))
			 (if a (apply (cdr a) (cdr e)) e))
			(else e)))
      e))

(define (macroexpand e)
  (if (pair? e) (let ((a (car e)))
		  (cond ((symbol? a)
			 (set! a (assq a *defmacros*))
			 (if a (macroexpand (apply (cdr a) (cdr e))) e))
			(else e)))
      e))

(define gentemp
  (let ((*gensym-counter* -1))
    (lambda ()
      (set! *gensym-counter* (+ *gensym-counter* 1))
      (string->symbol
       (string-append "scm:G" (number->string *gensym-counter*))))))

(define defmacro:eval slib:eval)
(define defmacro:load load)

(define (slib:eval-load <filename> evl)
  (if (not (file-exists? <filename>))
      (set! <filename> (string-append <filename> (scheme-file-suffix))))
  (call-with-input-file <filename>
    (lambda (port)
      (let ((old-load-pathname *load-pathname*))
	(set! *load-pathname* <filename>)
	(do ((o (*load-reader* port) (*load-reader* port)))
	    ((eof-object? o))
	  (evl o))
	(set! *load-pathname* old-load-pathname)))))

;;;; Autoloads for SLIB procedures.

(define (trace-all . args) (require 'debug) (apply trace-all args))
(define (track-all . args) (require 'debug) (apply track-all args))
(define (stack-all . args) (require 'debug) (apply stack-all args))
(define (break-all . args) (require 'debug) (apply break-all args))
(define (pretty-print . args) (require 'pretty-print) (apply pretty-print args))

;;; (require 'transcript) would get us SLIB transcript -- not what we want.
(define (transcript-on arg)
  (load (in-vicinity (implementation-vicinity)
		     (string-append "Tscript" (scheme-file-suffix))))
  (transcript-on arg))
(define (transcript-off)
  (error "No transcript active"))

;;;; Macros.

;;; Trace gets re-defmacroed when tracef autoloads.
(defmacro trace x (cond ((null? x) '()) (else (require 'trace) `(trace ,@x))))
(defmacro track x (cond ((null? x) '()) (else (require 'track) `(track ,@x))))
(defmacro stack x (cond ((null? x) '()) (else (require 'stack) `(stack ,@x))))
(defmacro break x (cond ((null? x) '()) (else (require 'break) `(break ,@x))))

(defmacro defvar (var val)
  `(if (not (defined? ,var)) (define ,var ,val)))
(defmacro defconst (name value)
  (cond ((list? name) `(defconst ,(car name) (lambda ,(cdr name) ,value)))
	(else (cond ((not (slib:eval `(defined? ,name))))
		    ((and (symbol? name) (equal? (slib:eval value)
						 (slib:eval name))))
		    (else (slib:error 'trying-to-defconst name
				      'to-different-value value)))
	      `(define ,name ,value))))
(defmacro qase (key . clauses)
  `(case ,key
     ,@(map (lambda (clause)
	      (if (list? (car clause))
		  (cons (apply
			 append
			 (map (lambda (elt)
				(case elt
				  ((unquote) '(unquote))
				  ((unquote-splicing) '(unquote-splicing))
				  (else
				   (eval (list 'quasiquote (list elt))))))
			      (car clause)))
			(cdr clause))
		  clause))
	    clauses)))
(defmacro (casev . args) `(qase ,@args))

(defmacro fluid-let (clauses . body)
  (let ((ids (map car clauses))
	(temp (gentemp))
	(swap (gentemp)))
    `(let* ((,temp (list ,@(map cadr clauses)))
	    (,swap (lambda () (set! ,temp (set! ,ids ,temp)))))
       (dynamic-wind
	   ,swap
	   (lambda () ,@body)
	   ,swap))))

(define print-args
  (procedure->syntax
   (lambda (sexp env)
     (set! env (environment->tree env))
     (let ((frame (and (not (null? env)) (car env))))
       (cond ((not (null? (cdr sexp)))
	      (display "In")
	      (for-each (lambda (exp) (display #\ ) (display exp)) (cdr sexp))
	      (display ": ")))
       (do ((vars (car frame) (cdr vars))
	    (vals (cdr frame) (cdr vals)))
	   ((not (pair? vars))
	    (cond ((not (null? vars))
		   (write vars)
		   (display " := ")
		   (write vals)))
	    (newline))
	 (write (car vars))
	 (display " = ")
	 (write (car vals))
	 (display "; "))))))

(cond
 ((defined? stack-trace)

;;#+breakpoint-error;; remove line to enable breakpointing on calls to ERROR
(define error
  (letrec ((oerror error)
           (nerror
            (lambda args
              (dynamic-wind
                  (lambda () (set! error oerror))
                  (lambda ()
                    (define cep (current-error-port))
                    (if (defined? print-call-stack)
                        (print-call-stack cep))
                    (perror "ERROR")
                    (errno 0)
                    (display "ERROR: " cep)
                    (if (not (null? args))
                        (begin (display (car args) cep)
                               (for-each (lambda (x) (display #\  cep) (write x cep))
                                         (cdr args))))
                    (newline cep)
                    (cond ((stack-trace) (newline cep)))
                    (display " * Breakpoint established: (continue <val>) to return." cep)
                    (newline cep) (force-output cep)
                    (require 'debug) (apply breakpoint args))
                  (lambda () (set! error nerror))))))
    nerror))

(define (user-interrupt . args)
  (define cep (current-error-port))
  (newline cep)
  (if (defined? print-call-stack)
      (print-call-stack cep))
  (display "ERROR: user interrupt" cep)
  (newline cep)
  (cond ((stack-trace) (newline cep)))
  (display " * Breakpoint established: (continue <val>) to return." cep)
  (newline cep) (force-output cep)
  (require 'debug) (apply breakpoint args))
  ))

;;; ABS and MAGNITUDE can be the same.
(cond ((and (inexact? (string->number "0.0")) (not (defined? exp)))
       (or (and (defined? usr:lib)
		(usr:lib "m")
		(load (in-vicinity (implementation-vicinity) "Transcen")
		      (usr:lib "m")))
	   (load (in-vicinity (implementation-vicinity) "Transcen")))
       (set! abs magnitude)))

(if (defined? array?)
(begin

(define (array-null? array)
  (zero? (apply * (map (lambda (bnd) (- 1 (apply - bnd)))
		       (array-shape array)))))
(define (create-array prot . args)
  (if (array-null? prot)
      (dimensions->uniform-array args (array-prototype prot))
      (dimensions->uniform-array args (array-prototype prot)
				 (apply array-ref prot
					(map car (array-shape prot))))))
(define make-array create-array)
(define (make-uniform-wrapper prot)
  (if (string? prot) (set! prot (string->number prot)))
  (if prot
      (lambda opt (if (null? opt)
		      (list->uniform-array 1 prot '())
		      (list->uniform-array 0 prot (car opt))))
      vector))
(define Ac64 (make-uniform-wrapper "+64i"))
(define Ac32 (make-uniform-wrapper "+32i"))
(define Ar64 (make-uniform-wrapper "64."))
(define Ar32 (make-uniform-wrapper "32."))
(define As64 (make-uniform-wrapper -64))
(define As32 (make-uniform-wrapper -32))
(define As16 (make-uniform-wrapper -16))
(define As8  (make-uniform-wrapper -8))
(define Au64 (make-uniform-wrapper  64))
(define Au32 (make-uniform-wrapper  32))
(define Au16 (make-uniform-wrapper  16))
(define Au8  (make-uniform-wrapper  8))
(define At1  (make-uniform-wrapper  #t))

(define (array-shape a)
  (let ((dims (array-dimensions a)))
    (if (pair? dims)
	(map (lambda (ind) (if (number? ind) (list 0 (+ -1 ind)) ind))
	     dims)
	dims)))
(define array=? equal?)
))

(define (alarm-interrupt) (alarm 0))
(if (defined? setitimer)
    (begin
      (define profile-alarm #f)
      (define (profile-alarm-interrupt) (profile-alarm 0))
      (define virtual-alarm #f)
      (define (virtual-alarm-interrupt) (virtual-alarm 0))
      (define milli-alarm #f)
      (let ((make-alarm
	     (lambda (sym)
	       (and (setitimer sym 0 0)	;DJGPP supports only REAL and PROFILE
		    (lambda (value . interval)
		      (cadr
		       (setitimer sym value
				  (if (pair? interval) (car interval) 0))))))))
	(set! profile-alarm (make-alarm 'profile))
	(set! virtual-alarm (make-alarm 'virtual))
	(set! milli-alarm (make-alarm 'real)))))

;;;; Initialize statically linked add-ons
(cond ((defined? scm_init_extensions)
       (scm_init_extensions)
       (set! scm_init_extensions #f)))

;;; Use *argv* instead of (program-arguments), to allow option
;;; processing to be done on it.  "ScmInit.scm" must
;;;	(set! *argv* (program-arguments))
;;; if it wants to alter the arguments which BOOT-TAIL processes.
(define *argv* #f)

(if (not (defined? *syntax-rules*))
    (define *syntax-rules* #f))
(if (not (defined? *interactive*))
    (define *interactive* #f))

(define (boot-tail dumped?)
  (cond ((not *argv*)
	 (set! *argv* (program-arguments))
	 (cond (dumped?
		(set-vicinities! dumped?)
		(verbose (if (and (isatty? (current-input-port))
				  (isatty? (current-output-port)))
			     (if (<= (length *argv*) 1) 2 1)
			     0))))
	 (cond ((provided? 'getopt)
		(set! *optind* 1)
		(set! *optarg* #f)))))

;;; This loads the user's initialization file, or files named in
;;; program arguments.
  (or (eq? (software-type) 'THINKC)
      (member "-no-init-file" (program-arguments))
      (member "--no-init-file" (program-arguments))
      (try-load (in-vicinity (or (home-vicinity) (user-vicinity))
			     (string-append "ScmInit") (scheme-file-suffix))
		*load-reader*)
      (errno 0))

  ;; Include line numbers in loaded code.
  (if (defined? read-numbered)
      (set! *load-reader* read-numbered))

  (cond
   ((and (> (length *argv*) 1) (char=? #\- (string-ref (cadr *argv*) 0)))
    (require 'getopt)
;;; (else
;;;  (define *optind* 1)
;;;  (define getopt:opt #f)
;;;  (define (getopt optstring) #f))

    (let* ((simple-opts "muvqibs")
	   (arg-opts '("a kbytes" "-version" "-help"
		       "no-init-file" "-no-init-file" "p number"
		       "h feature" "r feature" "d filename"
		       "f filename" "l filename"
		       "c string" "e string" "o filename"))
	   (opts (apply string-append ":" simple-opts
			(map (lambda (o)
			       (string-append (string (string-ref o 0)) ":"))
			     arg-opts)))
	   (didsomething #f)
	   (moreopts #t)
	   (exe-name (symbol->string (scheme-implementation-type)))
	   (up-name (apply string (map char-upcase (string->list exe-name)))))

      (define (do-thunk thunk)
	(if *interactive*
	    (thunk)
	    (let ((complete #f))
	      (dynamic-wind
		  (lambda () #f)
		  (lambda ()
		    (thunk)
		    (set! complete #t))
		  (lambda ()
		    (if (not complete) (close-port (current-input-port))))))))

      (define (do-string-arg)
	(require 'string-port)
	(do-thunk
	 (lambda ()
	   ((if *syntax-rules* macro:eval eval)
	    (call-with-input-string
		(string-append "(begin " *optarg* ")")
	      read))))
	(set! didsomething #t))

      (define (do-load file)
	(do-thunk
	 (lambda ()
	   (cond (*syntax-rules* (require 'macro) (macro:load file))
		 (else (load file)))))
	(set! didsomething #t))

      (define (usage preopt opt postopt success?)
	(define cep (if success? (current-output-port) (current-error-port)))
	(define indent (make-string 6 #\ ))
	(define i 3)
	(cond ((char? opt) (set! opt (string opt)))
	      ;;((symbol? opt) (set! opt (symbol->string opt)))
	      )
	(display (string-append preopt opt postopt) cep)
	(newline cep)
	(display (string-append "Usage: "
				exe-name
				" [-a kbytes] [-" simple-opts "]") cep)
	(for-each
	 (lambda (o)
	   (display (string-append " [-" o "]") cep)
	   (set! i (+ 1 i))
	   (cond ((zero? (modulo i 5)) (newline cep) (display indent cep))))
	 (cdr arg-opts))
	(display " [-- | -s | -] [file] [args...]" cep) (newline cep)
	(if success? (display success? cep) (quit #f)))

      ;; -a int => ignore (handled by scm_init_from_argv)
      ;; -c str => (eval str)
      ;; -e str => (eval str)
      ;; -d str => (require 'databases) (open-database str)
      ;; -f str => (load str)
      ;; -l str => (load str)
      ;; -r sym => (require sym)
      ;; -h sym => (provide sym)
      ;; -o str => (dump str)
      ;; -p int => (verbose int)
      ;; -m     => (set! *syntax-rules* #t)
      ;; -u     => (set! *syntax-rules* #f)
      ;; -v     => (verbose 3)
      ;; -q     => (verbose 0)
      ;; -i     => (set! *interactive* #t)
      ;; -b     => (set! *interactive* #f)
      ;; -s     => set argv, don't execute first one
      ;; -no-init-file => don't load init file
      ;; --no-init-file => don't load init file
      ;; --help => print and exit
      ;; --version => print and exit
      ;; --     => last option

      (let loop ((option (getopt-- opts)))
	(case option
	  ((#\a)
	   (cond ((> *optind* 3)
		  (usage "scm: option `-" getopt:opt "' must be first" #f))
		 ((or (not (exact? (string->number *optarg*)))
		      (not (<= 1 (string->number *optarg*) 10000)))
		  ;;	This size limit should match scm.c ^^
		  (usage "scm: option `-" getopt:opt
			 (string-append *optarg* "' unreasonable") #f))))
	  ((#\e #\c) (do-string-arg))	;sh-like
	  ((#\f #\l) (do-load *optarg*)) ;(set-car! *argv* *optarg*)
	  ((#\d) (require 'databases)
	   (open-database *optarg*))
	  ((#\o) (require 'dump)
	   (if (< *optind* (length *argv*))
	       (dump *optarg* #t)
	       (dump *optarg*)))
	  ((#\r) (do-thunk (lambda ()
			     (if (and (= 1 (string-length *optarg*))
				      (char-numeric? (string-ref *optarg* 0)))
				 (case (string-ref *optarg* 0)
				   ((#\2) (require 'r2rs))
				   ((#\3) (require 'r3rs))
				   ((#\4) (require 'r4rs))
				   ((#\5) (require 'r5rs)
				    (set! *syntax-rules* #t))
				   (else (require (string->symbol *optarg*))))
				 (require (string->symbol *optarg*))))))
	  ((#\h) (do-thunk (lambda () (provide (string->symbol *optarg*)))))
	  ((#\p) (verbose (string->number *optarg*)))
	  ((#\q) (verbose 0))
	  ((#\v) (verbose 3))
	  ((#\i) (set! *interactive* #t) ;sh-like
	   (verbose (max 2 (verbose))))
	  ((#\b) (set! didsomething #t)
	   (set! *interactive* #f))
	  ((#\s) (set! moreopts #f)	;sh-like
	   (set! didsomething #t)
	   (set! *interactive* #t))
	  ((#\m) (set! *syntax-rules* #t))
	  ((#\u) (set! *syntax-rules* #f))
	  ((#\n) (if (not (string=? "o-init-file" *optarg*))
		     (usage "scm: unrecognized option `-n" *optarg* "'" #f)))
	  ((#\:) (usage "scm: option `-" getopt:opt "' requires an argument" #f))
	  ((#\?) (usage "scm: unrecognized option `-" getopt:opt "'" #f))
	  ((#f) (set! moreopts #f)	;sh-like
	   (cond ((and (< *optind* (length *argv*))
		       (string=? "-" (list-ref *argv* *optind*)))
		  (set! *optind* (+ 1 *optind*)))))
	  (else
	   (or (cond ((not (string? option)) #f)
		     ((string-ci=? "no-init-file" option))
		     ((string-ci=? "version" option)
		      (display
		       (string-append exe-name " "
				      (scheme-implementation-version)
				      "
Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
"
				      up-name
				      " may be distributed under the terms of"
				      " the GNU General Public Licence;
certain other uses are permitted as well."
				      " For details, see the file `COPYING',
which is included in the "
				      up-name " distribution.
There is no warranty, to the extent permitted by law.
"
				      ))
		      (cond ((execpath) =>
			     (lambda (path)
			       (display " This executable was loaded from ")
			       (write path)
			       (newline))))
		      (quit #t))
		     ((string-ci=? "help" option)
		      (usage "This is "
			     up-name
			     ", a Scheme interpreter."
			     (let ((sihp (scheme-implementation-home-page)))
			       (if sihp
				   (string-append "Latest info: " sihp "
")
				   "")))
		      (quit #t))
		     (else #f))
	       (usage "scm: unknown option `--" option "'" #f))))

	(cond ((and moreopts (< *optind* (length *argv*)))
	       (loop (getopt-- opts)))
	      ((< *optind* (length *argv*)) ;No more opts
	       (set! *argv* (list-tail *argv* *optind*))
	       (set! *optind* 1)
	       (cond ((and (not didsomething) *script*)
		      (do-load *script*)
		      (set! *optind* (+ 1 *optind*))))
	       (cond ((and (> (verbose) 2)
			   (not (= (+ -1 *optind*) (length *argv*))))
		      (display "scm: extra command arguments unused:"
			       (current-error-port))
		      (for-each (lambda (x) (display (string-append " " x)
						     (current-error-port)))
				(list-tail *argv* (+ -1 *optind*)))
		      (newline (current-error-port)))))
	      ((and (not didsomething) (= *optind* (length *argv*)))
	       (set! *interactive* #t)))))

    (cond ((not *interactive*) (quit))
	  ((and *syntax-rules* (not (provided? 'macro)))
	   (require 'repl)
	   (require 'macro)
	   (let* ((oquit quit))
	     (set! quit (lambda () (repl:quit)))
	     (set! exit quit)
	     (repl:top-level macro:eval)
	     (oquit))))
    ;;otherwise, fall into natural SCM repl.
    )
   (else (errno 0)
	 (set! *interactive* #t)
	 (for-each load (cdr (program-arguments))))))