1 files changed, 51 insertions, 33 deletions

diff --git a/vscm.init b/vscm.init
index f642ba0..b45fa7e 100644
--- a/vscm.init
+++ b/vscm.init
@@ -44,8 +44,8 @@
 
 (define (scheme-implementation-type) 'Vscm)
 
-;;; (scheme-implementation-home-page) should return a (string) URL
-;;; (Uniform Resource Locator) for this scheme implementation's home
+;;; (scheme-implementation-home-page) should return a (string) URI
+;;; (Uniform Resource Identifier) for this scheme implementation's home
 ;;; page; or false if there isn't one.
 
 (define (scheme-implementation-home-page)
@@ -97,64 +97,73 @@
 					;(slib:load-source "filename")
 ;	compiled			;can load compiled files
 					;(slib:load-compiled "filename")
-	rev4-report			;conforms to
-;	rev3-report			;conforms to
-	ieee-p1178			;conforms to
-;	sicp				;runs code from Structure and
-					;Interpretation of Computer
-					;Programs by Abelson and Sussman.
+
+		       ;; Scheme report features
+
+;	rev5-report			;conforms to
+;	eval				;R5RS 2-argument eval
+	values				;R5RS multiple values
+;	dynamic-wind			;R5RS dynamic-wind
+;	macro				;R5RS high level macros
+	delay				;has DELAY and FORCE
+	multiarg-apply			;APPLY can take more than 2 args.
+;	char-ready?
+	rationalize
 	rev4-optional-procedures	;LIST-TAIL, STRING->LIST,
 					;LIST->STRING, STRING-COPY,
 					;STRING-FILL!, LIST->VECTOR,
 					;VECTOR->LIST, and VECTOR-FILL!
-	rev3-procedures			;LAST-PAIR, T, and NIL
+
+	rev4-report			;conforms to
+
+	ieee-p1178			;conforms to
+
+;	rev3-report			;conforms to
+
 ;	rev2-procedures			;SUBSTRING-MOVE-LEFT!,
 					;SUBSTRING-MOVE-RIGHT!,
 					;SUBSTRING-FILL!,
 					;STRING-NULL?, APPEND!, 1+,
 					;-1+, <?, <=?, =?, >?, >=?
+;	object-hash			;has OBJECT-HASH
+
 	multiarg/and-			;/ and - can take more than 2 args.
-	multiarg-apply			;APPLY can take more than 2 args.
-	rationalize
-	delay				;has DELAY and FORCE
 	with-file			;has WITH-INPUT-FROM-FILE and
 					;WITH-OUTPUT-FROM-FILE
-	string-port			;has CALL-WITH-INPUT-STRING and
-					;CALL-WITH-OUTPUT-STRING
 ;	transcript			;TRANSCRIPT-ON and TRANSCRIPT-OFF
-;	char-ready?
-;	macro				;has R4RS high level macros
-	defmacro			;has Common Lisp DEFMACRO
-;	eval				;proposed 2-argument eval
-;	record				;has user defined data structures
-	values				;proposed multiple values
-;	dynamic-wind			;proposed dynamic-wind
-	ieee-floating-point		;conforms to
+	ieee-floating-point		;conforms to IEEE Standard 754-1985
+					;IEEE Standard for Binary
+					;Floating-Point Arithmetic.
 	full-continuation		;can return multiple times
-;	object-hash			;has OBJECT-HASH
 
+			;; Other common features
+
+;	srfi				;srfi-0, COND-EXPAND finds all srfi-*
+;	sicp				;runs code from Structure and
+					;Interpretation of Computer
+					;Programs by Abelson and Sussman.
+	defmacro			;has Common Lisp DEFMACRO
+;	record				;has user defined data structures
+	string-port			;has CALL-WITH-INPUT-STRING and
+					;CALL-WITH-OUTPUT-STRING
 ;	sort
-;	queue				;queues
 ;	pretty-print
 	object->string
-;	format
+;	format				;Common-lisp output formatting
 ;	trace				;has macros: TRACE and UNTRACE
 ;	compiler			;has (COMPILER)
 ;	ed				;(ED) is editor
 	system				;posix (system <string>)
 	getenv				;posix (getenv <string>)
 	program-arguments		;returns list of strings (argv)
-;	Xwindows			;X support
-;	curses				;screen management package
-;	termcap				;terminal description package
-;	terminfo			;sysV terminal description
+;	current-time			;returns time in seconds since 1/1/1970
 	))
 
 ;;; (OBJECT->STRING obj)  -- analogous to WRITE
 (define object->string string-write)
 
 ;;; (PROGRAM-ARGUMENTS)
-;;; 
+;;;
 (define (program-arguments) command-line-arguments)
 
 ;;; (OUTPUT-PORT-WIDTH <port>)
@@ -252,6 +261,13 @@
 
     (open-output-generic write display write-char newline flush close)))
 
+;;; "rationalize" adjunct procedures.
+(define (find-ratio x e)
+  (let ((rat (rationalize x e)))
+    (list (numerator rat) (denominator rat))))
+(define (find-ratio-between x y)
+  (find-ratio (/ (+ x y) 2) (/ (- x y) 2)))
+
 ;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
 ;;; be returned by CHAR->INTEGER.
 (define char-code-limit 256)
@@ -320,12 +336,14 @@
 
 (define slib:warn
   (lambda args
-    (let ((port (current-error-port)))
-      (display "Warn: " port)
-      (for-each (lambda (x) (display x port)) args))))
+    (let ((cep (current-error-port)))
+      (if (provided? 'trace) (print-call-stack cep))
+      (display "Warn: " cep)
+      (for-each (lambda (x) (display x cep)) args))))
 
 ;;; define an error procedure for the library
 (define (slib:error . argl)
+  (if (provided? 'trace) (print-call-stack (current-error-port)))
   (error argl))
 
 ;;; define these as appropriate for your system.