From 8466d8cfa486fb30d1755c4261b781135083787b Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Mon, 20 Feb 2017 00:05:29 -0800
Subject: Import Upstream version 3a1

---
 format.scm | 1676 ------------------------------------------------------------
 1 file changed, 1676 deletions(-)
 delete mode 100644 format.scm

(limited to 'format.scm')

diff --git a/format.scm b/format.scm
deleted file mode 100644
index 709acf7..0000000
--- a/format.scm
+++ /dev/null
@@ -1,1676 +0,0 @@
-;;; "format.scm" Common LISP text output formatter for SLIB
-; Written 1992-1994 by Dirk Lutzebaeck (lutzeb@cs.tu-berlin.de)
-;
-; This code is in the public domain.
-
-; Authors of the original version (< 1.4) were Ken Dickey and Aubrey Jaffer.
-; Please send error reports to the email address above.
-; For documentation see slib.texi and format.doc.
-; For testing load formatst.scm.
-;
-; Version 3.0
-
-(provide 'format)
-(require 'string-case)
-(require 'string-port)
-(require 'multiarg/and-)
-(require 'rev4-optional-procedures)
-
-;;; Configuration ------------------------------------------------------------
-
-(define format:symbol-case-conv #f)
-;; Symbols are converted by symbol->string so the case of the printed
-;; symbols is implementation dependent. format:symbol-case-conv is a
-;; one arg closure which is either #f (no conversion), string-upcase!,
-;; string-downcase! or string-capitalize!.
-
-(define format:iobj-case-conv #f)
-;; As format:symbol-case-conv but applies for the representation of
-;; implementation internal objects.
-
-(define format:expch #\E)
-;; The character prefixing the exponent value in ~e printing.
-
-(define format:floats (provided? 'inexact))
-;; Detects if the scheme system implements flonums (see at eof).
-
-(define format:complex-numbers (provided? 'complex))
-;; Detects if the scheme system implements complex numbers.
-
-(define format:radix-pref (char=? #\# (string-ref (number->string 8 8) 0)))
-;; Detects if number->string adds a radix prefix.
-
-(define format:ascii-non-printable-charnames
-  '#("nul" "soh" "stx" "etx" "eot" "enq" "ack" "bel"
-     "bs"  "ht"  "nl"  "vt"  "np"  "cr"  "so"  "si"
-     "dle" "dc1" "dc2" "dc3" "dc4" "nak" "syn" "etb"
-     "can" "em"  "sub" "esc" "fs"  "gs"  "rs"  "us" "space"))
-
-;;; End of configuration ----------------------------------------------------
-
-(define format:version "3.0")
-(define format:port #f)			; curr. format output port
-(define format:output-col 0)		; curr. format output tty column
-(define format:flush-output #f)		; flush output at end of formatting
-(define format:case-conversion #f)
-(define format:error-continuation #f)
-(define format:args #f)
-(define format:pos 0)			; curr. format string parsing position
-(define format:arg-pos 0)		; curr. format argument position
-					; this is global for error presentation
-
-; format string and char output routines on format:port
-
-(define (format:out-str str)
-  (if format:case-conversion
-      (display (format:case-conversion str) format:port)
-      (display str format:port))
-  (set! format:output-col
-	(+ format:output-col (string-length str))))
-
-(define (format:out-char ch)
-  (if format:case-conversion
-      (display (format:case-conversion (string ch)) format:port)
-      (write-char ch format:port))
-  (set! format:output-col
-	(if (char=? ch #\newline)
-	    0
-	    (+ format:output-col 1))))
-
-;(define (format:out-substr str i n)  ; this allocates a new string
-;  (display (substring str i n) format:port)
-;  (set! format:output-col (+ format:output-col n)))
-
-(define (format:out-substr str i n)
-  (do ((k i (+ k 1)))
-      ((= k n))
-    (write-char (string-ref str k) format:port))
-  (set! format:output-col (+ format:output-col n)))
-
-;(define (format:out-fill n ch)       ; this allocates a new string
-;  (format:out-str (make-string n ch)))
-
-(define (format:out-fill n ch)
-  (do ((i 0 (+ i 1)))
-      ((= i n))
-    (write-char ch format:port))
-  (set! format:output-col (+ format:output-col n)))
-
-; format's user error handler
-
-(define (format:error . args)		; never returns!
-  (let ((error-continuation format:error-continuation)
-	(format-args format:args)
-	(port (current-error-port)))
-    (set! format:error format:intern-error)
-    (if (and (>= (length format:args) 2)
-	     (string? (cadr format:args)))
-	(let ((format-string (cadr format-args)))
-	  (if (not (zero? format:arg-pos))
-	      (set! format:arg-pos (- format:arg-pos 1)))
-	  (format port "~%FORMAT: error with call: (format ~a \"~a<===~a\" ~
-                                  ~{~a ~}===>~{~a ~})~%        "
-		  (car format:args)
-		  (substring format-string 0 format:pos)
-		  (substring format-string format:pos
-			     (string-length format-string))
-		  (format:list-head (cddr format:args) format:arg-pos)
-		  (list-tail (cddr format:args) format:arg-pos)))
-	(format port
-		"~%FORMAT: error with call: (format~{ ~a~})~%        "
-		format:args))
-    (apply format port args)
-    (newline port)
-    (set! format:error format:error-save)
-    (set! format:error-continuation error-continuation)
-    (format:abort)
-    (format:intern-error "format:abort does not jump to toplevel!")))
-
-(define format:error-save format:error)
-
-(define (format:intern-error . args)   ;if something goes wrong in format:error
-  (display "FORMAT: INTERNAL ERROR IN FORMAT:ERROR!") (newline)
-  (display "        format args: ") (write format:args) (newline)
-  (display "        error args:  ") (write args) (newline)
-  (set! format:error format:error-save)
-  (format:abort))
-
-(define (format:format . args)		; the formatter entry
-  (set! format:args args)
-  (set! format:arg-pos 0)
-  (set! format:pos 0)
-  (if (< (length args) 1)
-      (format:error "not enough arguments"))
-
-  ;; If the first argument is a string, then that's the format string.
-  ;; (Scheme->C)
-  ;; In this case, put the argument list in canonical form.
-  (let ((args (if (string? (car args))
-		  (cons #f args)
-		  args)))
-    ;; Use this canonicalized version when reporting errors.
-    (set! format:args args)
-
-    (let ((destination (car args))
-	  (arglist (cdr args)))
-      (cond
-       ((or (and (boolean? destination)	; port output
-		 destination)
-	    (output-port? destination)
-	    (number? destination))
-	(format:out (cond
-		     ((boolean? destination) (current-output-port))
-		     ((output-port? destination) destination)
-		     ((number? destination) (current-error-port)))
-		    (car arglist) (cdr arglist)))
-       ((and (boolean? destination)	; string output
-	     (not destination))
-	(call-with-output-string
-	 (lambda (port) (format:out port (car arglist) (cdr arglist)))))
-       (else
-	(format:error "illegal destination `~a'" destination))))))
-
-(define (format:out port fmt args)	; the output handler for a port
-  (set! format:port port)		; global port for output routines
-  (set! format:case-conversion #f)	; modifier case conversion procedure
-  (set! format:flush-output #f)		; ~! reset
-  (let ((arg-pos (format:format-work fmt args))
-	(arg-len (length args)))
-    (cond
-     ((< arg-pos arg-len)
-      (set! format:arg-pos (+ arg-pos 1))
-      (set! format:pos (string-length fmt))
-      (format:error "~a superfluous argument~:p" (- arg-len arg-pos)))
-     ((> arg-pos arg-len)
-      (set! format:arg-pos (+ arg-len 1))
-      (display format:arg-pos)
-      (format:error "~a missing argument~:p" (- arg-pos arg-len)))
-     (else
-      (if format:flush-output (force-output port))
-      #t))))
-
-(define format:parameter-characters
-  '(#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9 #\- #\+ #\v #\# #\'))
-
-(define (format:format-work format-string arglist) ; does the formatting work
-  (letrec
-      ((format-string-len (string-length format-string))
-       (arg-pos 0)			; argument position in arglist
-       (arg-len (length arglist))	; number of arguments
-       (modifier #f)			; 'colon | 'at | 'colon-at | #f
-       (params '())			; directive parameter list
-       (param-value-found #f)		; a directive parameter value found
-       (conditional-nest 0)		; conditional nesting level
-       (clause-pos 0)			; last cond. clause beginning char pos
-       (clause-default #f)		; conditional default clause string
-       (clauses '())			; conditional clause string list
-       (conditional-type #f)		; reflects the contional modifiers
-       (conditional-arg #f)		; argument to apply the conditional
-       (iteration-nest 0)		; iteration nesting level
-       (iteration-pos 0)		; iteration string beginning char pos
-       (iteration-type #f)		; reflects the iteration modifiers
-       (max-iterations #f)		; maximum number of iterations
-       (recursive-pos-save format:pos)
-
-       (next-char			; gets the next char from format-string
-	(lambda ()
-	  (let ((ch (peek-next-char)))
-	    (set! format:pos (+ 1 format:pos))
-	    ch)))
-
-       (peek-next-char
-	(lambda ()
-	  (if (>= format:pos format-string-len)
-	      (format:error "illegal format string")
-	      (string-ref format-string format:pos))))
-
-       (one-positive-integer?
-	(lambda (params)
-	  (cond
-	   ((null? params) #f)
-	   ((and (integer? (car params))
-		 (>= (car params) 0)
-		 (= (length params) 1)) #t)
-	   (else (format:error "one positive integer parameter expected")))))
-
-       (next-arg
-	(lambda ()
-	  (if (>= arg-pos arg-len)
-	      (begin
-		(set! format:arg-pos (+ arg-len 1))
-		(format:error "missing argument(s)")))
-	  (add-arg-pos 1)
-	  (list-ref arglist (- arg-pos 1))))
-
-       (prev-arg
-	(lambda ()
-	  (add-arg-pos -1)
-	  (if (negative? arg-pos)
-	      (format:error "missing backward argument(s)"))
-	  (list-ref arglist arg-pos)))
-
-       (rest-args
-	(lambda ()
-	  (let loop ((l arglist) (k arg-pos)) ; list-tail definition
-	    (if (= k 0) l (loop (cdr l) (- k 1))))))
-
-       (add-arg-pos
-	(lambda (n)
-	  (set! arg-pos (+ n arg-pos))
-	  (set! format:arg-pos arg-pos)))
-
-       (anychar-dispatch		; dispatches the format-string
-	(lambda ()
-	  (if (>= format:pos format-string-len)
-	      arg-pos			; used for ~? continuance
-	      (let ((char (next-char)))
-		(cond
-		 ((char=? char #\~)
-		  (set! modifier #f)
-		  (set! params '())
-		  (set! param-value-found #f)
-		  (tilde-dispatch))
-		 (else
-		  (if (and (zero? conditional-nest)
-			   (zero? iteration-nest))
-		      (format:out-char char))
-		  (anychar-dispatch)))))))
-
-       (tilde-dispatch
-	(lambda ()
-	  (cond
-	   ((>= format:pos format-string-len)
-	    (format:out-str "~")	; tilde at end of string is just output
-	    arg-pos)			; used for ~? continuance
-	   ((and (or (zero? conditional-nest)
-		     (memv (peek-next-char) ; find conditional directives
-			   (append '(#\[ #\] #\; #\: #\@ #\^)
-				   format:parameter-characters)))
-		 (or (zero? iteration-nest)
-		     (memv (peek-next-char) ; find iteration directives
-			   (append '(#\{ #\} #\: #\@ #\^)
-				   format:parameter-characters))))
-	    (case (char-upcase (next-char))
-
-	      ;; format directives
-
-	      ((#\A)			; Any -- for humans
-	       (set! format:read-proof (memq modifier '(colon colon-at)))
-	       (format:out-obj-padded (memq modifier '(at colon-at))
-				      (next-arg) #f params)
-	       (anychar-dispatch))
-	      ((#\S)			; Slashified -- for parsers
-	       (set! format:read-proof (memq modifier '(colon colon-at)))
-	       (format:out-obj-padded (memq modifier '(at colon-at))
-				      (next-arg) #t params)
-	       (anychar-dispatch))
-	      ((#\D)			; Decimal
-	       (format:out-num-padded modifier (next-arg) params 10)
-	       (anychar-dispatch))
-	      ((#\X)			; Hexadecimal
-	       (format:out-num-padded modifier (next-arg) params 16)
-	       (anychar-dispatch))
-	      ((#\O)			; Octal
-	       (format:out-num-padded modifier (next-arg) params 8)
-	       (anychar-dispatch))
-	      ((#\B)			; Binary
-	       (format:out-num-padded modifier (next-arg) params 2)
-	       (anychar-dispatch))
-	      ((#\R)
-	       (if (null? params)
-		   (format:out-obj-padded ; Roman, cardinal, ordinal numerals
-		    #f
-		    ((case modifier
-		       ((at) format:num->roman)
-		       ((colon-at) format:num->old-roman)
-		       ((colon) format:num->ordinal)
-		       (else format:num->cardinal))
-		     (next-arg))
-		    #f params)
-		   (format:out-num-padded ; any Radix
-		    modifier (next-arg) (cdr params) (car params)))
-	       (anychar-dispatch))
-	      ((#\F)			; Fixed-format floating-point
-	       (if format:floats
-		   (format:out-fixed modifier (next-arg) params)
-		   (format:out-str (number->string (next-arg))))
-	       (anychar-dispatch))
-	      ((#\E)			; Exponential floating-point
-	       (if format:floats
-		   (format:out-expon modifier (next-arg) params)
-		   (format:out-str (number->string (next-arg))))
-	       (anychar-dispatch))
-	      ((#\G)			; General floating-point
-	       (if format:floats
-		   (format:out-general modifier (next-arg) params)
-		   (format:out-str (number->string (next-arg))))
-	       (anychar-dispatch))
-	      ((#\$)			; Dollars floating-point
-	       (if format:floats
-		   (format:out-dollar modifier (next-arg) params)
-		   (format:out-str (number->string (next-arg))))
-	       (anychar-dispatch))
-	      ((#\I)			; Complex numbers
-	       (if (not format:complex-numbers)
-		   (format:error
-		    "complex numbers not supported by this scheme system"))
-	       (let ((z (next-arg)))
-		 (if (not (complex? z))
-		     (format:error "argument not a complex number"))
-		 (format:out-fixed modifier (real-part z) params)
-		 (format:out-fixed 'at (imag-part z) params)
-		 (format:out-char #\i))
-	       (anychar-dispatch))
-	      ((#\C)			; Character
-	       (let ((ch (if (one-positive-integer? params)
-			     (integer->char (car params))
-			     (next-arg))))
-		 (if (not (char? ch)) (format:error "~~c expects a character"))
-		 (case modifier
-		   ((at)
-		    (format:out-str (format:char->str ch)))
-		   ((colon)
-		    (let ((c (char->integer ch)))
-		      (if (< c 0)
-			  (set! c (+ c 256))) ; compensate complement impl.
-		      (cond
-		       ((< c #x20)	; assumes that control chars are < #x20
-			(format:out-char #\^)
-			(format:out-char
-			 (integer->char (+ c #x40))))
-		       ((>= c #x7f)
-			(format:out-str "#\\")
-			(format:out-str
-			 (if format:radix-pref
-			     (let ((s (number->string c 8)))
-			       (substring s 2 (string-length s)))
-			     (number->string c 8))))
-		       (else
-			(format:out-char ch)))))
-		   (else (format:out-char ch))))
-	       (anychar-dispatch))
-	      ((#\P)			; Plural
-	       (if (memq modifier '(colon colon-at))
-		   (prev-arg))
-	       (let ((arg (next-arg)))
-		 (if (not (number? arg))
-		     (format:error "~~p expects a number argument"))
-		 (if (= arg 1)
-		     (if (memq modifier '(at colon-at))
-			 (format:out-char #\y))
-		     (if (memq modifier '(at colon-at))
-			 (format:out-str "ies")
-			 (format:out-char #\s))))
-	       (anychar-dispatch))
-	      ((#\~)			; Tilde
-	       (if (one-positive-integer? params)
-		   (format:out-fill (car params) #\~)
-		   (format:out-char #\~))
-	       (anychar-dispatch))
-	      ((#\%)			; Newline
-	       (if (one-positive-integer? params)
-		   (format:out-fill (car params) #\newline)
-		   (format:out-char #\newline))
-	       (set! format:output-col 0)
-	       (anychar-dispatch))
-	      ((#\&)			; Fresh line
-	       (if (one-positive-integer? params)
-		   (begin
-		     (if (> (car params) 0)
-			 (format:out-fill (- (car params)
-					     (if (> format:output-col 0) 0 1))
-					  #\newline))
-		     (set! format:output-col 0))
-		   (if (> format:output-col 0)
-		       (format:out-char #\newline)))
-	       (anychar-dispatch))
-	      ((#\_)			; Space character
-	       (if (one-positive-integer? params)
-		   (format:out-fill (car params) #\space)
-		   (format:out-char #\space))
-	       (anychar-dispatch))
-	      ((#\/)			; Tabulator character
-	       (if (one-positive-integer? params)
-		   (format:out-fill (car params) slib:tab)
-		   (format:out-char slib:tab))
-	       (anychar-dispatch))
-	      ((#\|)			; Page seperator
-	       (if (one-positive-integer? params)
-		   (format:out-fill (car params) slib:form-feed)
-		   (format:out-char slib:form-feed))
-	       (set! format:output-col 0)
-	       (anychar-dispatch))
-	      ((#\T)			; Tabulate
-	       (format:tabulate modifier params)
-	       (anychar-dispatch))
-	      ((#\Y)			; Pretty-print
-	       (require 'pretty-print)
-	       (pretty-print (next-arg) format:port)
-	       (set! format:output-col 0)
-	       (anychar-dispatch))
-	      ((#\? #\K)		; Indirection (is "~K" in T-Scheme)
-	       (cond
-		((memq modifier '(colon colon-at))
-		 (format:error "illegal modifier in ~~?"))
-		((eq? modifier 'at)
-		 (let* ((frmt (next-arg))
-			(args (rest-args)))
-		   (add-arg-pos (format:format-work frmt args))))
-		(else
-		 (let* ((frmt (next-arg))
-			(args (next-arg)))
-		   (format:format-work frmt args))))
-	       (anychar-dispatch))
-	      ((#\!)			; Flush output
-	       (set! format:flush-output #t)
-	       (anychar-dispatch))
-	      ((#\newline)		; Continuation lines
-	       (if (eq? modifier 'at)
-		   (format:out-char #\newline))
-	       (if (< format:pos format-string-len)
-		   (do ((ch (peek-next-char) (peek-next-char)))
-		       ((or (not (char-whitespace? ch))
-			    (= format:pos (- format-string-len 1))))
-		     (if (eq? modifier 'colon)
-			 (format:out-char (next-char))
-			 (next-char))))
-	       (anychar-dispatch))
-	      ((#\*)			; Argument jumping
-	       (case modifier
-		 ((colon)		; jump backwards
-		  (if (one-positive-integer? params)
-		      (do ((i 0 (+ i 1)))
-			  ((= i (car params)))
-			(prev-arg))
-		      (prev-arg)))
-		 ((at)			; jump absolute
-		  (set! arg-pos (if (one-positive-integer? params)
-				    (car params) 0)))
-		 ((colon-at)
-		  (format:error "illegal modifier `:@' in ~~* directive"))
-		 (else			; jump forward
-		  (if (one-positive-integer? params)
-		      (do ((i 0 (+ i 1)))
-			  ((= i (car params)))
-			(next-arg))
-		      (next-arg))))
-	       (anychar-dispatch))
-	      ((#\()			; Case conversion begin
-	       (set! format:case-conversion
-		     (case modifier
-		       ((at) format:string-capitalize-first)
-		       ((colon) string-capitalize)
-		       ((colon-at) string-upcase)
-		       (else string-downcase)))
-	       (anychar-dispatch))
-	      ((#\))			; Case conversion end
-	       (if (not format:case-conversion)
-		   (format:error "missing ~~("))
-	       (set! format:case-conversion #f)
-	       (anychar-dispatch))
-	      ((#\[)			; Conditional begin
-	       (set! conditional-nest (+ conditional-nest 1))
-	       (cond
-		((= conditional-nest 1)
-		 (set! clause-pos format:pos)
-		 (set! clause-default #f)
-		 (set! clauses '())
-		 (set! conditional-type
-		       (case modifier
-			 ((at) 'if-then)
-			 ((colon) 'if-else-then)
-			 ((colon-at) (format:error "illegal modifier in ~~["))
-			 (else 'num-case)))
-		 (set! conditional-arg
-		       (if (one-positive-integer? params)
-			   (car params)
-			   (next-arg)))))
-	       (anychar-dispatch))
-	      ((#\;)                    ; Conditional separator
-	       (if (zero? conditional-nest)
-		   (format:error "~~; not in ~~[~~] conditional"))
-	       (if (not (null? params))
-		   (format:error "no parameter allowed in ~~;"))
-	       (if (= conditional-nest 1)
-		   (let ((clause-str
-			  (cond
-			   ((eq? modifier 'colon)
-			    (set! clause-default #t)
-			    (substring format-string clause-pos
-				       (- format:pos 3)))
-			   ((memq modifier '(at colon-at))
-			    (format:error "illegal modifier in ~~;"))
-			   (else
-			    (substring format-string clause-pos
-				       (- format:pos 2))))))
-		     (set! clauses (append clauses (list clause-str)))
-		     (set! clause-pos format:pos)))
-	       (anychar-dispatch))
-	      ((#\])			; Conditional end
-	       (if (zero? conditional-nest) (format:error "missing ~~["))
-	       (set! conditional-nest (- conditional-nest 1))
-	       (if modifier
-		   (format:error "no modifier allowed in ~~]"))
-	       (if (not (null? params))
-		   (format:error "no parameter allowed in ~~]"))
-	       (cond
-		((zero? conditional-nest)
-		 (let ((clause-str (substring format-string clause-pos
-					      (- format:pos 2))))
-		   (if clause-default
-		       (set! clause-default clause-str)
-		       (set! clauses (append clauses (list clause-str)))))
-		 (case conditional-type
-		   ((if-then)
-		    (if conditional-arg
-			(format:format-work (car clauses)
-					    (list conditional-arg))))
-		   ((if-else-then)
-		    (add-arg-pos
-		     (format:format-work (if conditional-arg
-					     (cadr clauses)
-					     (car clauses))
-					 (rest-args))))
-		   ((num-case)
-		    (if (or (not (integer? conditional-arg))
-			    (< conditional-arg 0))
-			(format:error "argument not a positive integer"))
-		    (if (not (and (>= conditional-arg (length clauses))
-				  (not clause-default)))
-			(add-arg-pos
-			 (format:format-work
-			  (if (>= conditional-arg (length clauses))
-			      clause-default
-			      (list-ref clauses conditional-arg))
-			  (rest-args))))))))
-	       (anychar-dispatch))
-	      ((#\{)			; Iteration begin
-	       (set! iteration-nest (+ iteration-nest 1))
-	       (cond
-		((= iteration-nest 1)
-		 (set! iteration-pos format:pos)
-		 (set! iteration-type
-		       (case modifier
-			 ((at) 'rest-args)
-			 ((colon) 'sublists)
-			 ((colon-at) 'rest-sublists)
-			 (else 'list)))
-		 (set! max-iterations (if (one-positive-integer? params)
-					 (car params) #f))))
-	       (anychar-dispatch))
-	      ((#\})			; Iteration end
-	       (if (zero? iteration-nest) (format:error "missing ~~{"))
-	       (set! iteration-nest (- iteration-nest 1))
-	       (case modifier
-		 ((colon)
-		  (if (not max-iterations) (set! max-iterations 1)))
-		 ((colon-at at) (format:error "illegal modifier"))
-		 (else (if (not max-iterations) (set! max-iterations 100))))
-	       (if (not (null? params))
-		   (format:error "no parameters allowed in ~~}"))
-	       (if (zero? iteration-nest)
-		 (let ((iteration-str
-			(substring format-string iteration-pos
-				   (- format:pos (if modifier 3 2)))))
-		   (if (string=? iteration-str "")
-		       (set! iteration-str (next-arg)))
-		   (case iteration-type
-		     ((list)
-		      (let ((args (next-arg))
-			    (args-len 0))
-			(if (not (list? args))
-			    (format:error "expected a list argument"))
-			(set! args-len (length args))
-			(do ((arg-pos 0 (+ arg-pos
-					   (format:format-work
-					    iteration-str
-					    (list-tail args arg-pos))))
-			     (i 0 (+ i 1)))
-			    ((or (>= arg-pos args-len)
-				 (>= i max-iterations))))))
-		     ((sublists)
-		      (let ((args (next-arg))
-			    (args-len 0))
-			(if (not (list? args))
-			    (format:error "expected a list argument"))
-			(set! args-len (length args))
-			(do ((arg-pos 0 (+ arg-pos 1)))
-			    ((or (>= arg-pos args-len)
-				 (>= arg-pos max-iterations)))
-			  (let ((sublist (list-ref args arg-pos)))
-			    (if (not (list? sublist))
-				(format:error
-				 "expected a list of lists argument"))
-			    (format:format-work iteration-str sublist)))))
-		     ((rest-args)
-		      (let* ((args (rest-args))
-			     (args-len (length args))
-			     (usedup-args
-			      (do ((arg-pos 0 (+ arg-pos
-						 (format:format-work
-						  iteration-str
-						  (list-tail
-						   args arg-pos))))
-				   (i 0 (+ i 1)))
-				  ((or (>= arg-pos args-len)
-				       (>= i max-iterations))
-				   arg-pos))))
-			(add-arg-pos usedup-args)))
-		     ((rest-sublists)
-		      (let* ((args (rest-args))
-			     (args-len (length args))
-			     (usedup-args
-			      (do ((arg-pos 0 (+ arg-pos 1)))
-				  ((or (>= arg-pos args-len)
-				       (>= arg-pos max-iterations))
-				   arg-pos)
-				(let ((sublist (list-ref args arg-pos)))
-				  (if (not (list? sublist))
-				      (format:error "expected list arguments"))
-				  (format:format-work iteration-str sublist)))))
-			(add-arg-pos usedup-args)))
-		     (else (format:error "internal error in ~~}")))))
-	       (anychar-dispatch))
-	      ((#\^)			; Up and out
-	       (let* ((continue
-		       (cond
-			((not (null? params))
-			 (not
-			  (case (length params)
-			   ((1) (zero? (car params)))
-			   ((2) (= (list-ref params 0) (list-ref params 1)))
-			   ((3) (<= (list-ref params 0)
-				    (list-ref params 1)
-				    (list-ref params 2)))
-			   (else (format:error "too much parameters")))))
-			(format:case-conversion ; if conversion stop conversion
-			 (set! format:case-conversion string-copy) #t)
-			((= iteration-nest 1) #t)
-			((= conditional-nest 1) #t)
-			((>= arg-pos arg-len)
-			 (set! format:pos format-string-len) #f)
-			(else #t))))
-		 (if continue
-		     (anychar-dispatch))))
-
-	      ;; format directive modifiers and parameters
-
-	      ((#\@)			; `@' modifier
-	       (if (memq modifier '(at colon-at))
-		   (format:error "double `@' modifier"))
-	       (set! modifier (if (eq? modifier 'colon) 'colon-at 'at))
-	       (tilde-dispatch))
-	      ((#\:)			; `:' modifier
-	       (if (memq modifier '(colon colon-at))
-		   (format:error "double `:' modifier"))
-	       (set! modifier (if (eq? modifier 'at) 'colon-at 'colon))
-	       (tilde-dispatch))
-	      ((#\')			; Character parameter
-	       (if modifier (format:error "misplaced modifier"))
-	       (set! params (append params (list (char->integer (next-char)))))
-	       (set! param-value-found #t)
-	       (tilde-dispatch))
-	      ((#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9 #\- #\+) ; num. paramtr
-	       (if modifier (format:error "misplaced modifier"))
-	       (let ((num-str-beg (- format:pos 1))
-		     (num-str-end format:pos))
-		 (do ((ch (peek-next-char) (peek-next-char)))
-		     ((not (char-numeric? ch)))
-		   (next-char)
-		   (set! num-str-end (+ 1 num-str-end)))
-		 (set! params
-		       (append params
-			       (list (string->number
-				      (substring format-string
-						 num-str-beg
-						 num-str-end))))))
-	       (set! param-value-found #t)
-	       (tilde-dispatch))
-	      ((#\V)			; Variable parameter from next argum.
-	       (if modifier (format:error "misplaced modifier"))
-	       (set! params (append params (list (next-arg))))
-	       (set! param-value-found #t)
-	       (tilde-dispatch))
-	      ((#\#)			; Parameter is number of remaining args
-	       (if modifier (format:error "misplaced modifier"))
-	       (set! params (append params (list (length (rest-args)))))
-	       (set! param-value-found #t)
-	       (tilde-dispatch))
-	      ((#\,)			; Parameter separators
-	       (if modifier (format:error "misplaced modifier"))
-	       (if (not param-value-found)
-		   (set! params (append params '(#f)))) ; append empty paramtr
-	       (set! param-value-found #f)
-	       (tilde-dispatch))
-	      ((#\Q)			; Inquiry messages
-	       (if (eq? modifier 'colon)
-		   (format:out-str format:version)
-		   (let ((nl (string #\newline)))
-		     (format:out-str
-		      (string-append
-		       "SLIB Common LISP format version " format:version nl
-		       "  (C) copyright 1992-1994 by Dirk Lutzebaeck" nl
-		       "  please send bug reports to `lutzeb@cs.tu-berlin.de'"
-		       nl))))
-	       (anychar-dispatch))
-	      (else			; Unknown tilde directive
-	       (format:error "unknown control character `~c'"
-		      (string-ref format-string (- format:pos 1))))))
-	   (else (anychar-dispatch)))))) ; in case of conditional
-
-    (set! format:pos 0)
-    (set! format:arg-pos 0)
-    (anychar-dispatch)			; start the formatting
-    (set! format:pos recursive-pos-save)
-    arg-pos))				; return the position in the arg. list
-
-;; format:obj->str returns a R4RS representation as a string of an arbitrary
-;; scheme object.
-;; First parameter is the object, second parameter is a boolean if the
-;; representation should be slashified as `write' does.
-;; It uses format:char->str which converts a character into
-;; a slashified string as `write' does and which is implementation dependent.
-;; It uses format:iobj->str to print out internal objects as
-;; quoted strings so that the output can always be processed by (read)
-
-(define (format:obj->str obj slashify)
-  (cond
-   ((string? obj)
-    (if slashify
-	(let ((obj-len (string-length obj)))
-	  (string-append
-	   "\""
-	   (let loop ((i 0) (j 0))	; taken from Marc Feeley's pp.scm
-	     (if (= j obj-len)
-		 (string-append (substring obj i j) "\"")
-		 (let ((c (string-ref obj j)))
-		   (if (or (char=? c #\\)
-			   (char=? c #\"))
-		       (string-append (substring obj i j) "\\"
-				      (loop j (+ j 1)))
-		       (loop i (+ j 1))))))))
-	obj))
-
-   ((boolean? obj) (if obj "#t" "#f"))
-
-   ((number? obj) (number->string obj))
-
-   ((symbol? obj)
-    (if format:symbol-case-conv
-	(format:symbol-case-conv (symbol->string obj))
-	(symbol->string obj)))
-
-   ((char? obj)
-    (if slashify
-	(format:char->str obj)
-	(string obj)))
-
-   ((null? obj) "()")
-
-   ((input-port? obj)
-    (format:iobj->str obj))
-
-   ((output-port? obj)
-    (format:iobj->str obj))
-
-   ((list? obj)
-    (string-append "("
-		   (let loop ((obj-list obj))
-		     (if (null? (cdr obj-list))
-			 (format:obj->str (car obj-list) #t)
-			 (string-append
-			  (format:obj->str (car obj-list) #t)
-			  " "
-			  (loop (cdr obj-list)))))
-		   ")"))
-
-   ((pair? obj)
-    (string-append "("
-		   (format:obj->str (car obj) #t)
-		   " . "
-		   (format:obj->str (cdr obj) #t)
-		   ")"))
-
-   ((vector? obj)
-    (string-append "#" (format:obj->str (vector->list obj) #t)))
-
-   (else				; only objects with an #<...>
-    (format:iobj->str obj))))		; representation should fall in here
-
-;; format:iobj->str reveals the implementation dependent representation of
-;; #<...> objects with the use of display and call-with-output-string.
-;; If format:read-proof is set to #t the resulting string is additionally
-;; set into string quotes.
-
-(define format:read-proof #f)
-
-(define (format:iobj->str iobj)
-  (if (or format:read-proof
-	  format:iobj-case-conv)
-      (string-append
-       (if format:read-proof "\"" "")
-       (if format:iobj-case-conv
-	   (format:iobj-case-conv
-	    (call-with-output-string (lambda (p) (display iobj p))))
-	   (call-with-output-string (lambda (p) (display iobj p))))
-       (if format:read-proof "\"" ""))
-      (call-with-output-string (lambda (p) (display iobj p)))))
-
-
-;; format:char->str converts a character into a slashified string as
-;; done by `write'. The procedure is dependent on the integer
-;; representation of characters and assumes a character number according to
-;; the ASCII character set.
-
-(define (format:char->str ch)
-  (let ((int-rep (char->integer ch)))
-    (if (< int-rep 0)			; if chars are [-128...+127]
-	(set! int-rep (+ int-rep 256)))
-    (string-append
-     "#\\"
-     (cond
-      ((char=? ch #\newline) "newline")
-      ((and (>= int-rep 0) (<= int-rep 32))
-       (vector-ref format:ascii-non-printable-charnames int-rep))
-      ((= int-rep 127) "del")
-      ((>= int-rep 128)		; octal representation
-       (if format:radix-pref
-	   (let ((s (number->string int-rep 8)))
-	     (substring s 2 (string-length s)))
-	   (number->string int-rep 8)))
-      (else (string ch))))))
-
-(define format:space-ch (char->integer #\space))
-(define format:zero-ch (char->integer #\0))
-
-(define (format:par pars length index default name)
-  (if (> length index)
-      (let ((par (list-ref pars index)))
-	(if par
-	    (if name
-		(if (< par 0)
-		    (format:error
-		     "~s parameter must be a positive integer" name)
-		    par)
-		par)
-	    default))
-      default))
-
-(define (format:out-obj-padded pad-left obj slashify pars)
-  (if (null? pars)
-      (format:out-str (format:obj->str obj slashify))
-      (let ((l (length pars)))
-	(let ((mincol (format:par pars l 0 0 "mincol"))
-	      (colinc (format:par pars l 1 1 "colinc"))
-	      (minpad (format:par pars l 2 0 "minpad"))
-	      (padchar (integer->char
-			(format:par pars l 3 format:space-ch #f)))
-	      (objstr (format:obj->str obj slashify)))
-	  (if (not pad-left)
-	      (format:out-str objstr))
-	  (do ((objstr-len (string-length objstr))
-	       (i minpad (+ i colinc)))
-	      ((>= (+ objstr-len i) mincol)
-	       (format:out-fill i padchar)))
-	  (if pad-left
-	      (format:out-str objstr))))))
-
-(define (format:out-num-padded modifier number pars radix)
-  (if (not (integer? number)) (format:error "argument not an integer"))
-  (let ((numstr (number->string number radix)))
-    (if (and format:radix-pref (not (= radix 10)))
-	(set! numstr (substring numstr 2 (string-length numstr))))
-    (if (and (null? pars) (not modifier))
-	(format:out-str numstr)
-	(let ((l (length pars))
-	      (numstr-len (string-length numstr)))
-	  (let ((mincol (format:par pars l 0 #f "mincol"))
-		(padchar (integer->char
-			  (format:par pars l 1 format:space-ch #f)))
-		(commachar (integer->char
-			    (format:par pars l 2 (char->integer #\,) #f)))
-		(commawidth (format:par pars l 3 3 "commawidth")))
-	    (if mincol
-		(let ((numlen numstr-len)) ; calc. the output len of number
-		  (if (and (memq modifier '(at colon-at)) (> number 0))
-		      (set! numlen (+ numlen 1)))
-		  (if (memq modifier '(colon colon-at))
-		      (set! numlen (+ (quotient (- numstr-len
-						   (if (< number 0) 2 1))
-						commawidth)
-				      numlen)))
-		  (if (> mincol numlen)
-		      (format:out-fill (- mincol numlen) padchar))))
-	    (if (and (memq modifier '(at colon-at))
-		     (> number 0))
-		(format:out-char #\+))
-	    (if (memq modifier '(colon colon-at)) ; insert comma character
-		(let ((start (remainder numstr-len commawidth))
-		      (ns (if (< number 0) 1 0)))
-		  (format:out-substr numstr 0 start)
-		  (do ((i start (+ i commawidth)))
-		      ((>= i numstr-len))
-		    (if (> i ns)
-			(format:out-char commachar))
-		    (format:out-substr numstr i (+ i commawidth))))
-		(format:out-str numstr)))))))
-
-(define (format:tabulate modifier pars)
-  (let ((l (length pars)))
-    (let ((colnum (format:par pars l 0 1 "colnum"))
-	  (colinc (format:par pars l 1 1 "colinc"))
-	  (padch (integer->char (format:par pars l 2 format:space-ch #f))))
-      (case modifier
-	((colon colon-at)
-	 (format:error "unsupported modifier for ~~t"))
-	((at)				; relative tabulation
-	 (format:out-fill
-	  (if (= colinc 0)
-	      colnum			; colnum = colrel
-	      (do ((c 0 (+ c colinc))
-		   (col (+ format:output-col colnum)))
-		  ((>= c col)
-		   (- c format:output-col))))
-	  padch))
-	(else				; absolute tabulation
-	 (format:out-fill
-	  (cond
-	   ((< format:output-col colnum)
-	    (- colnum format:output-col))
-	   ((= colinc 0)
-	    0)
-	   (else
-	    (do ((c colnum (+ c colinc)))
-		((>= c format:output-col)
-		 (- c format:output-col)))))
-	  padch))))))
-
-
-;; roman numerals (from dorai@cs.rice.edu).
-
-(define format:roman-alist
-  '((1000 #\M) (500 #\D) (100 #\C) (50 #\L)
-    (10 #\X) (5 #\V) (1 #\I)))
-
-(define format:roman-boundary-values
-  '(100 100 10 10 1 1 #f))
-
-(define format:num->old-roman
-  (lambda (n)
-    (if (and (integer? n) (>= n 1))
-	(let loop ((n n)
-		   (romans format:roman-alist)
-		   (s '()))
-	  (if (null? romans) (list->string (reverse s))
-	      (let ((roman-val (caar romans))
-		    (roman-dgt (cadar romans)))
-		(do ((q (quotient n roman-val) (- q 1))
-		     (s s (cons roman-dgt s)))
-		    ((= q 0)
-		     (loop (remainder n roman-val)
-		       (cdr romans) s))))))
-	(format:error "only positive integers can be romanized"))))
-
-(define format:num->roman
-  (lambda (n)
-    (if (and (integer? n) (> n 0))
-	(let loop ((n n)
-		   (romans format:roman-alist)
-		   (boundaries format:roman-boundary-values)
-		   (s '()))
-	  (if (null? romans)
-	      (list->string (reverse s))
-	      (let ((roman-val (caar romans))
-		    (roman-dgt (cadar romans))
-		    (bdry (car boundaries)))
-		(let loop2 ((q (quotient n roman-val))
-			    (r (remainder n roman-val))
-			    (s s))
-		  (if (= q 0)
-		      (if (and bdry (>= r (- roman-val bdry)))
-			  (loop (remainder r bdry) (cdr romans)
-			    (cdr boundaries)
-			    (cons roman-dgt
-			      (append
-				(cdr (assv bdry romans))
-				s)))
-			  (loop r (cdr romans) (cdr boundaries) s))
-		      (loop2 (- q 1) r (cons roman-dgt s)))))))
-	(format:error "only positive integers can be romanized"))))
-
-;; cardinals & ordinals (from dorai@cs.rice.edu)
-
-(define format:cardinal-ones-list
-  '(#f "one" "two" "three" "four" "five"
-     "six" "seven" "eight" "nine" "ten" "eleven" "twelve" "thirteen"
-     "fourteen" "fifteen" "sixteen" "seventeen" "eighteen"
-     "nineteen"))
-
-(define format:cardinal-tens-list
-  '(#f #f "twenty" "thirty" "forty" "fifty" "sixty" "seventy" "eighty"
-     "ninety"))
-
-(define format:num->cardinal999
-  (lambda (n)
-    ;this procedure is inspired by the Bruno Haible's CLisp
-    ;function format-small-cardinal, which converts numbers
-    ;in the range 1 to 999, and is used for converting each
-    ;thousand-block in a larger number
-    (let* ((hundreds (quotient n 100))
-	   (tens+ones (remainder n 100))
-	   (tens (quotient tens+ones 10))
-	   (ones (remainder tens+ones 10)))
-      (append
-	(if (> hundreds 0)
-	    (append
-	      (string->list
-		(list-ref format:cardinal-ones-list hundreds))
-	      (string->list" hundred")
-	      (if (> tens+ones 0) '(#\space) '()))
-	    '())
-	(if (< tens+ones 20)
-	    (if (> tens+ones 0)
-		(string->list
-		  (list-ref format:cardinal-ones-list tens+ones))
-		'())
-	    (append
-	      (string->list
-		(list-ref format:cardinal-tens-list tens))
-	      (if (> ones 0)
-		  (cons #\-
-		    (string->list
-		      (list-ref format:cardinal-ones-list ones)))
-		  '())))))))
-
-(define format:cardinal-thousand-block-list
-  '("" " thousand" " million" " billion" " trillion" " quadrillion"
-     " quintillion" " sextillion" " septillion" " octillion" " nonillion"
-     " decillion" " undecillion" " duodecillion" " tredecillion"
-     " quattuordecillion" " quindecillion" " sexdecillion" " septendecillion"
-     " octodecillion" " novemdecillion" " vigintillion"))
-
-(define format:num->cardinal
-  (lambda (n)
-    (cond ((not (integer? n))
-	   (format:error
-	     "only integers can be converted to English cardinals"))
-	  ((= n 0) "zero")
-	  ((< n 0) (string-append "minus " (format:num->cardinal (- n))))
-	  (else
-	    (let ((power3-word-limit
-		    (length format:cardinal-thousand-block-list)))
-	      (let loop ((n n)
-			 (power3 0)
-			 (s '()))
-		(if (= n 0)
-		    (list->string s)
-		    (let ((n-before-block (quotient n 1000))
-			  (n-after-block (remainder n 1000)))
-		      (loop n-before-block
-			(+ power3 1)
-			(if (> n-after-block 0)
-			    (append
-			      (if (> n-before-block 0)
-				  (string->list ", ") '())
-			      (format:num->cardinal999 n-after-block)
-			      (if (< power3 power3-word-limit)
-				  (string->list
-				    (list-ref
-				     format:cardinal-thousand-block-list
-				     power3))
-				  (append
-				    (string->list " times ten to the ")
-				    (string->list
-				      (format:num->ordinal
-					(* power3 3)))
-				    (string->list " power")))
-			      s)
-			    s))))))))))
-
-(define format:ordinal-ones-list
-  '(#f "first" "second" "third" "fourth" "fifth"
-     "sixth" "seventh" "eighth" "ninth" "tenth" "eleventh" "twelfth"
-     "thirteenth" "fourteenth" "fifteenth" "sixteenth" "seventeenth"
-     "eighteenth" "nineteenth"))
-
-(define format:ordinal-tens-list
-  '(#f #f "twentieth" "thirtieth" "fortieth" "fiftieth" "sixtieth"
-     "seventieth" "eightieth" "ninetieth"))
-
-(define format:num->ordinal
-  (lambda (n)
-    (cond ((not (integer? n))
-	   (format:error
-	     "only integers can be converted to English ordinals"))
-	  ((= n 0) "zeroth")
-	  ((< n 0) (string-append "minus " (format:num->ordinal (- n))))
-	  (else
-	    (let ((hundreds (quotient n 100))
-		  (tens+ones (remainder n 100)))
-	      (string-append
-		(if (> hundreds 0)
-		    (string-append
-		      (format:num->cardinal (* hundreds 100))
-		      (if (= tens+ones 0) "th" " "))
-		    "")
-		(if (= tens+ones 0) ""
-		    (if (< tens+ones 20)
-			(list-ref format:ordinal-ones-list tens+ones)
-			(let ((tens (quotient tens+ones 10))
-			      (ones (remainder tens+ones 10)))
-			  (if (= ones 0)
-			      (list-ref format:ordinal-tens-list tens)
-			      (string-append
-				(list-ref format:cardinal-tens-list tens)
-				"-"
-				(list-ref format:ordinal-ones-list ones))))
-			))))))))
-
-;; format fixed flonums (~F)
-
-(define (format:out-fixed modifier number pars)
-  (if (not (or (number? number) (string? number)))
-      (format:error "argument is not a number or a number string"))
-
-  (let ((l (length pars)))
-    (let ((width (format:par pars l 0 #f "width"))
-	  (digits (format:par pars l 1 #f "digits"))
-	  (scale (format:par pars l 2 0 #f))
-	  (overch (format:par pars l 3 #f #f))
-	  (padch (format:par pars l 4 format:space-ch #f)))
-
-    (if digits
-
-	(begin				; fixed precision
-	  (format:parse-float
-	   (if (string? number) number (number->string number)) #t scale)
-	  (if (<= (- format:fn-len format:fn-dot) digits)
-	      (format:fn-zfill #f (- digits (- format:fn-len format:fn-dot)))
-	      (format:fn-round digits))
-	  (if width
-	      (let ((numlen (+ format:fn-len 1)))
-		(if (or (not format:fn-pos?) (eq? modifier 'at))
-		    (set! numlen (+ numlen 1)))
-		(if (and (= format:fn-dot 0) (> width (+ digits 1)))
-		    (set! numlen (+ numlen 1)))
-		(if (< numlen width)
-		    (format:out-fill (- width numlen) (integer->char padch)))
-		(if (and overch (> numlen width))
-		    (format:out-fill width (integer->char overch))
-		    (format:fn-out modifier (> width (+ digits 1)))))
-	      (format:fn-out modifier #t)))
-
-	(begin				; free precision
-	  (format:parse-float
-	   (if (string? number) number (number->string number)) #t scale)
-	  (format:fn-strip)
-	  (if width
-	      (let ((numlen (+ format:fn-len 1)))
-		(if (or (not format:fn-pos?) (eq? modifier 'at))
-		    (set! numlen (+ numlen 1)))
-		(if (= format:fn-dot 0)
-		    (set! numlen (+ numlen 1)))
-		(if (< numlen width)
-		    (format:out-fill (- width numlen) (integer->char padch)))
-		(if (> numlen width)	; adjust precision if possible
-		    (let ((dot-index (- numlen
-					(- format:fn-len format:fn-dot))))
-		      (if (> dot-index width)
-			  (if overch	; numstr too big for required width
-			      (format:out-fill width (integer->char overch))
-			      (format:fn-out modifier #t))
-			  (begin
-			    (format:fn-round (- width dot-index))
-			    (format:fn-out modifier #t))))
-		    (format:fn-out modifier #t)))
-	      (format:fn-out modifier #t)))))))
-
-;; format exponential flonums (~E)
-
-(define (format:out-expon modifier number pars)
-  (if (not (or (number? number) (string? number)))
-      (format:error "argument is not a number"))
-
-  (let ((l (length pars)))
-    (let ((width (format:par pars l 0 #f "width"))
-	  (digits (format:par pars l 1 #f "digits"))
-	  (edigits (format:par pars l 2 #f "exponent digits"))
-	  (scale (format:par pars l 3 1 #f))
-	  (overch (format:par pars l 4 #f #f))
-	  (padch (format:par pars l 5 format:space-ch #f))
-	  (expch (format:par pars l 6 #f #f)))
-
-    (if digits				; fixed precision
-
-	(let ((digits (if (> scale 0)
-			  (if (< scale (+ digits 2))
-			      (+ (- digits scale) 1)
-			      0)
-			  digits)))
-	  (format:parse-float
-	   (if (string? number) number (number->string number)) #f scale)
-	  (if (<= (- format:fn-len format:fn-dot) digits)
-	      (format:fn-zfill #f (- digits (- format:fn-len format:fn-dot)))
-	      (format:fn-round digits))
-	  (if width
-	      (if (and edigits overch (> format:en-len edigits))
-		  (format:out-fill width (integer->char overch))
-		  (let ((numlen (+ format:fn-len 3))) ; .E+
-		    (if (or (not format:fn-pos?) (eq? modifier 'at))
-			(set! numlen (+ numlen 1)))
-		    (if (and (= format:fn-dot 0) (> width (+ digits 1)))
-			(set! numlen (+ numlen 1)))
-		    (set! numlen
-			  (+ numlen
-			     (if (and edigits (>= edigits format:en-len))
-				 edigits
-				 format:en-len)))
-		    (if (< numlen width)
-			(format:out-fill (- width numlen)
-					 (integer->char padch)))
-		    (if (and overch (> numlen width))
-			(format:out-fill width (integer->char overch))
-			(begin
-			  (format:fn-out modifier (> width (- numlen 1)))
-			  (format:en-out edigits expch)))))
-	      (begin
-		(format:fn-out modifier #t)
-		(format:en-out edigits expch))))
-
-	(begin				; free precision
-	  (format:parse-float
-	   (if (string? number) number (number->string number)) #f scale)
-	  (format:fn-strip)
-	  (if width
-	      (if (and edigits overch (> format:en-len edigits))
-		  (format:out-fill width (integer->char overch))
-		  (let ((numlen (+ format:fn-len 3))) ; .E+
-		    (if (or (not format:fn-pos?) (eq? modifier 'at))
-			(set! numlen (+ numlen 1)))
-		    (if (= format:fn-dot 0)
-			(set! numlen (+ numlen 1)))
-		    (set! numlen
-			  (+ numlen
-			     (if (and edigits (>= edigits format:en-len))
-				 edigits
-				 format:en-len)))
-		    (if (< numlen width)
-			(format:out-fill (- width numlen)
-					 (integer->char padch)))
-		    (if (> numlen width) ; adjust precision if possible
-			(let ((f (- format:fn-len format:fn-dot))) ; fract len
-			  (if (> (- numlen f) width)
-			      (if overch ; numstr too big for required width
-				  (format:out-fill width
-						   (integer->char overch))
-				  (begin
-				    (format:fn-out modifier #t)
-				    (format:en-out edigits expch)))
-			      (begin
-				(format:fn-round (+ (- f numlen) width))
-				(format:fn-out modifier #t)
-				(format:en-out edigits expch))))
-			(begin
-			  (format:fn-out modifier #t)
-			  (format:en-out edigits expch)))))
-	      (begin
-		(format:fn-out modifier #t)
-		(format:en-out edigits expch))))))))
-
-;; format general flonums (~G)
-
-(define (format:out-general modifier number pars)
-  (if (not (or (number? number) (string? number)))
-      (format:error "argument is not a number or a number string"))
-
-  (let ((l (length pars)))
-    (let ((width (if (> l 0) (list-ref pars 0) #f))
-	  (digits (if (> l 1) (list-ref pars 1) #f))
-	  (edigits (if (> l 2) (list-ref pars 2) #f))
-	  (overch (if (> l 4) (list-ref pars 4) #f))
-	  (padch (if (> l 5) (list-ref pars 5) #f)))
-    (format:parse-float
-     (if (string? number) number (number->string number)) #t 0)
-    (format:fn-strip)
-    (let* ((ee (if edigits (+ edigits 2) 4)) ; for the following algorithm
-	   (ww (if width (- width ee) #f))   ; see Steele's CL book p.395
-	   (n (if (= format:fn-dot 0)	; number less than (abs 1.0) ?
-		  (- (format:fn-zlead))
-		  format:fn-dot))
-	   (d (if digits
-		  digits
-		  (max format:fn-len (min n 7)))) ; q = format:fn-len
-	   (dd (- d n)))
-      (if (<= 0 dd d)
-	  (begin
-	    (format:out-fixed modifier number (list ww dd #f overch padch))
-	    (format:out-fill ee #\space)) ;~@T not implemented yet
-	  (format:out-expon modifier number pars))))))
-
-;; format dollar flonums (~$)
-
-(define (format:out-dollar modifier number pars)
-  (if (not (or (number? number) (string? number)))
-      (format:error "argument is not a number or a number string"))
-
-  (let ((l (length pars)))
-    (let ((digits (format:par pars l 0 2 "digits"))
-	  (mindig (format:par pars l 1 1 "mindig"))
-	  (width (format:par pars l 2 0 "width"))
-	  (padch (format:par pars l 3 format:space-ch #f)))
-
-    (format:parse-float
-     (if (string? number) number (number->string number)) #t 0)
-    (if (<= (- format:fn-len format:fn-dot) digits)
-	(format:fn-zfill #f (- digits (- format:fn-len format:fn-dot)))
-	(format:fn-round digits))
-    (let ((numlen (+ format:fn-len 1)))
-      (if (or (not format:fn-pos?) (memq modifier '(at colon-at)))
-	  (set! numlen (+ numlen 1)))
-      (if (and mindig (> mindig format:fn-dot))
-	  (set! numlen (+ numlen (- mindig format:fn-dot))))
-      (if (and (= format:fn-dot 0) (not mindig))
-	  (set! numlen (+ numlen 1)))
-      (if (< numlen width)
-	  (case modifier
-	    ((colon)
-	     (if (not format:fn-pos?)
-		 (format:out-char #\-))
-	     (format:out-fill (- width numlen) (integer->char padch)))
-	    ((at)
-	     (format:out-fill (- width numlen) (integer->char padch))
-	     (format:out-char (if format:fn-pos? #\+ #\-)))
-	    ((colon-at)
-	     (format:out-char (if format:fn-pos? #\+ #\-))
-	     (format:out-fill (- width numlen) (integer->char padch)))
-	    (else
-	     (format:out-fill (- width numlen) (integer->char padch))
-	     (if (not format:fn-pos?)
-		 (format:out-char #\-))))
-	  (if format:fn-pos?
-	      (if (memq modifier '(at colon-at)) (format:out-char #\+))
-	      (format:out-char #\-))))
-    (if (and mindig (> mindig format:fn-dot))
-	(format:out-fill (- mindig format:fn-dot) #\0))
-    (if (and (= format:fn-dot 0) (not mindig))
-	(format:out-char #\0))
-    (format:out-substr format:fn-str 0 format:fn-dot)
-    (format:out-char #\.)
-    (format:out-substr format:fn-str format:fn-dot format:fn-len))))
-
-; the flonum buffers
-
-(define format:fn-max 200)		; max. number of number digits
-(define format:fn-str (make-string format:fn-max)) ; number buffer
-(define format:fn-len 0)		; digit length of number
-(define format:fn-dot #f)		; dot position of number
-(define format:fn-pos? #t)		; number positive?
-(define format:en-max 10)		; max. number of exponent digits
-(define format:en-str (make-string format:en-max)) ; exponent buffer
-(define format:en-len 0)		; digit length of exponent
-(define format:en-pos? #t)		; exponent positive?
-
-(define (format:parse-float num-str fixed? scale)
-  (set! format:fn-pos? #t)
-  (set! format:fn-len 0)
-  (set! format:fn-dot #f)
-  (set! format:en-pos? #t)
-  (set! format:en-len 0)
-  (do ((i 0 (+ i 1))
-       (left-zeros 0)
-       (mantissa? #t)
-       (all-zeros? #t)
-       (num-len (string-length num-str))
-       (c #f))			; current exam. character in num-str
-      ((= i num-len)
-       (if (not format:fn-dot)
-	   (set! format:fn-dot format:fn-len))
-
-       (if all-zeros?
-	   (begin
-	     (set! left-zeros 0)
-	     (set! format:fn-dot 0)
-	     (set! format:fn-len 1)))
-
-       ;; now format the parsed values according to format's need
-
-       (if fixed?
-
-	   (begin			; fixed format m.nnn or .nnn
-	     (if (and (> left-zeros 0) (> format:fn-dot 0))
-		 (if (> format:fn-dot left-zeros)
-		     (begin		; norm 0{0}nn.mm to nn.mm
-		       (format:fn-shiftleft left-zeros)
-		       (set! left-zeros 0)
-		       (set! format:fn-dot (- format:fn-dot left-zeros)))
-		     (begin		; normalize 0{0}.nnn to .nnn
-		       (format:fn-shiftleft format:fn-dot)
-		       (set! left-zeros (- left-zeros format:fn-dot))
-		       (set! format:fn-dot 0))))
-	     (if (or (not (= scale 0)) (> format:en-len 0))
-		 (let ((shift (+ scale (format:en-int))))
-		   (cond
-		    (all-zeros? #t)
-		    ((> (+ format:fn-dot shift) format:fn-len)
-		     (format:fn-zfill
-		      #f (- shift (- format:fn-len format:fn-dot)))
-		     (set! format:fn-dot format:fn-len))
-		    ((< (+ format:fn-dot shift) 0)
-		     (format:fn-zfill #t (- (- shift) format:fn-dot))
-		     (set! format:fn-dot 0))
-		    (else
-		     (if (> left-zeros 0)
-			 (if (<= left-zeros shift) ; shift always > 0 here
-			     (format:fn-shiftleft shift) ; shift out 0s
-			     (begin
-			       (format:fn-shiftleft left-zeros)
-			       (set! format:fn-dot (- shift left-zeros))))
-			 (set! format:fn-dot (+ format:fn-dot shift))))))))
-
-	   (let ((negexp		; expon format m.nnnEee
-		  (if (> left-zeros 0)
-		      (- left-zeros format:fn-dot -1)
-		      (if (= format:fn-dot 0) 1 0))))
-	     (if (> left-zeros 0)
-		 (begin			; normalize 0{0}.nnn to n.nn
-		   (format:fn-shiftleft left-zeros)
-		   (set! format:fn-dot 1))
-		 (if (= format:fn-dot 0)
-		     (set! format:fn-dot 1)))
-	     (format:en-set (- (+ (- format:fn-dot scale) (format:en-int))
-			       negexp))
-	     (cond
-	      (all-zeros?
-	       (format:en-set 0)
-	       (set! format:fn-dot 1))
-	      ((< scale 0)		; leading zero
-	       (format:fn-zfill #t (- scale))
-	       (set! format:fn-dot 0))
-	      ((> scale format:fn-dot)
-	       (format:fn-zfill #f (- scale format:fn-dot))
-	       (set! format:fn-dot scale))
-	      (else
-	       (set! format:fn-dot scale)))))
-       #t)
-
-    ;; do body
-    (set! c (string-ref num-str i))	; parse the output of number->string
-    (cond				; which can be any valid number
-     ((char-numeric? c)			; representation of R4RS except
-      (if mantissa?			; complex numbers
-	  (begin
-	    (if (char=? c #\0)
-		(if all-zeros?
-		    (set! left-zeros (+ left-zeros 1)))
-		(begin
-		  (set! all-zeros? #f)))
-	    (string-set! format:fn-str format:fn-len c)
-	    (set! format:fn-len (+ format:fn-len 1)))
-	  (begin
-	    (string-set! format:en-str format:en-len c)
-	    (set! format:en-len (+ format:en-len 1)))))
-     ((or (char=? c #\-) (char=? c #\+))
-      (if mantissa?
-	  (set! format:fn-pos? (char=? c #\+))
-	  (set! format:en-pos? (char=? c #\+))))
-     ((char=? c #\.)
-      (set! format:fn-dot format:fn-len))
-     ((char=? c #\e)
-      (set! mantissa? #f))
-     ((char=? c #\E)
-      (set! mantissa? #f))
-     ((char-whitespace? c) #t)
-     ((char=? c #\d) #t)		; decimal radix prefix
-     ((char=? c #\#) #t)
-     (else
-      (format:error "illegal character `~c' in number->string" c)))))
-
-(define (format:en-int)			; convert exponent string to integer
-  (if (= format:en-len 0)
-      0
-      (do ((i 0 (+ i 1))
-	   (n 0))
-	  ((= i format:en-len)
-	   (if format:en-pos?
-	       n
-	       (- n)))
-	(set! n (+ (* n 10) (- (char->integer (string-ref format:en-str i))
-			       format:zero-ch))))))
-
-(define (format:en-set en)		; set exponent string number
-  (set! format:en-len 0)
-  (set! format:en-pos? (>= en 0))
-  (let ((en-str (number->string en)))
-    (do ((i 0 (+ i 1))
-	 (en-len (string-length en-str))
-	 (c #f))
-	((= i en-len))
-      (set! c (string-ref en-str i))
-      (if (char-numeric? c)
-	  (begin
-	    (string-set! format:en-str format:en-len c)
-	    (set! format:en-len (+ format:en-len 1)))))))
-
-(define (format:fn-zfill left? n)	; fill current number string with 0s
-  (if (> (+ n format:fn-len) format:fn-max) ; from the left or right
-      (format:error "number is too long to format (enlarge format:fn-max)"))
-  (set! format:fn-len (+ format:fn-len n))
-  (if left?
-      (do ((i format:fn-len (- i 1)))	; fill n 0s to left
-	  ((< i 0))
-	(string-set! format:fn-str i
-		     (if (< i n)
-			 #\0
-			 (string-ref format:fn-str (- i n)))))
-      (do ((i (- format:fn-len n) (+ i 1))) ; fill n 0s to the right
-	  ((= i format:fn-len))
-	(string-set! format:fn-str i #\0))))
-
-(define (format:fn-shiftleft n)		; shift left current number n positions
-  (if (> n format:fn-len)
-      (format:error "internal error in format:fn-shiftleft (~d,~d)"
-		    n format:fn-len))
-  (do ((i n (+ i 1)))
-      ((= i format:fn-len)
-       (set! format:fn-len (- format:fn-len n)))
-    (string-set! format:fn-str (- i n) (string-ref format:fn-str i))))
-
-(define (format:fn-round digits)	; round format:fn-str
-  (set! digits (+ digits format:fn-dot))
-  (do ((i digits (- i 1))		; "099",2 -> "10"
-       (c 5))				; "023",2 -> "02"
-      ((or (= c 0) (< i 0))		; "999",2 -> "100"
-       (if (= c 1)			; "005",2 -> "01"
-	   (begin			; carry overflow
-	     (set! format:fn-len digits)
-	     (format:fn-zfill #t 1)	; add a 1 before fn-str
-	     (string-set! format:fn-str 0 #\1)
-	     (set! format:fn-dot (+ format:fn-dot 1)))
-	   (set! format:fn-len digits)))
-    (set! c (+ (- (char->integer (string-ref format:fn-str i))
-		  format:zero-ch) c))
-    (string-set! format:fn-str i (integer->char
-				  (if (< c 10)
-				      (+ c format:zero-ch)
-				      (+ (- c 10) format:zero-ch))))
-    (set! c (if (< c 10) 0 1))))
-
-(define (format:fn-out modifier add-leading-zero?)
-  (if format:fn-pos?
-      (if (eq? modifier 'at)
-	  (format:out-char #\+))
-      (format:out-char #\-))
-  (if (= format:fn-dot 0)
-      (if add-leading-zero?
-	  (format:out-char #\0))
-      (format:out-substr format:fn-str 0 format:fn-dot))
-  (format:out-char #\.)
-  (format:out-substr format:fn-str format:fn-dot format:fn-len))
-
-(define (format:en-out edigits expch)
-  (format:out-char (if expch (integer->char expch) format:expch))
-  (format:out-char (if format:en-pos? #\+ #\-))
-  (if edigits
-      (if (< format:en-len edigits)
-	  (format:out-fill (- edigits format:en-len) #\0)))
-  (format:out-substr format:en-str 0 format:en-len))
-
-(define (format:fn-strip)		; strip trailing zeros but one
-  (string-set! format:fn-str format:fn-len #\0)
-  (do ((i format:fn-len (- i 1)))
-      ((or (not (char=? (string-ref format:fn-str i) #\0))
-	   (<= i format:fn-dot))
-       (set! format:fn-len (+ i 1)))))
-
-(define (format:fn-zlead)		; count leading zeros
-  (do ((i 0 (+ i 1)))
-      ((or (= i format:fn-len)
-	   (not (char=? (string-ref format:fn-str i) #\0)))
-       (if (= i format:fn-len)		; found a real zero
-	   0
-	   i))))
-
-
-;;; some global functions not found in SLIB
-
-(define (format:string-capitalize-first str) ; "hello" -> "Hello"
-  (let ((cap-str (string-copy str))	; "hELLO" -> "Hello"
-	(non-first-alpha #f)		; "*hello" -> "*Hello"
-	(str-len (string-length str)))	; "hello you" -> "Hello you"
-    (do ((i 0 (+ i 1)))
-	((= i str-len) cap-str)
-      (let ((c (string-ref str i)))
-	(if (char-alphabetic? c)
-	    (if non-first-alpha
-		(string-set! cap-str i (char-downcase c))
-		(begin
-		  (set! non-first-alpha #t)
-		  (string-set! cap-str i (char-upcase c)))))))))
-
-(define (format:list-head l k)
-  (if (= k 0)
-      '()
-      (cons (car l) (format:list-head (cdr l) (- k 1)))))
-
-
-;; Aborts the program when a formatting error occures. This is a null
-;; argument closure to jump to the interpreters toplevel continuation.
-
-(define format:abort (lambda () (slib:error "error in format")))
-
-(define format format:format)
-
-;; If this is not possible then a continuation is used to recover
-;; properly from a format error. In this case format returns #f.
-
-;(define format:abort
-;  (lambda () (format:error-continuation #f)))
-
-;(define format
-;  (lambda args				; wraps format:format with an error
-;    (call-with-current-continuation	; continuation
-;     (lambda (cont)
-;       (set! format:error-continuation cont)
-;       (apply format:format args)))))
-
-;eof
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