Import Upstream version 2a6upstream/2a6

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+;"sc2.scm" Implementation of rev2 procedures eliminated in subsequent versions.
+; Copyright (C) 1991, 1993 Aubrey Jaffer.
+;
+;Permission to copy this software, to redistribute it, and to use it
+;for any purpose is granted, subject to the following restrictions and
+;understandings.
+;
+;1.  Any copy made of this software must include this copyright notice
+;in full.
+;
+;2.  I have made no warrantee or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3.  In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+(define (substring-move-left! string1 start1 end1 string2 start2)
+  (do ((i start1 (+ i 1))
+       (j start2 (+ j 1))
+       (l (- end1 start1) (- l 1)))
+      ((<= l 0))
+    (string-set! string2 j (string-ref string1 i))))
+
+(define (substring-move-right! string1 start1 end1 string2 start2)
+  (do ((i (+ start1 (- end1 start1) -1) (- i 1))
+       (j (+ start2 (- end1 start1) -1) (- j 1))
+       (l (- end1 start1) (- l 1)))
+      ((<= l 0))
+    (string-set! string2 j (string-ref string1 i))))
+
+(define (substring-fill! string start end char)
+  (do ((i start (+ i 1))
+       (l (- end start) (- l 1)))
+      ((<= l 0))
+    (string-set! string i char)))
+
+(define (string-null? str)
+  (= 0 (string-length str)))
+
+(define append!
+  (lambda args
+    (cond ((null? args) '())
+	  ((null? (cdr args)) (car args))
+	  ((null? (car args)) (apply append! (cdr args)))
+	  (else
+	   (set-cdr! (last-pair (car args))
+		     (apply append! (cdr args)))
+	   (car args)))))
+
+;;;; need to add code for OBJECT-HASH and OBJECT-UNHASH
+
+(define 1+
+  (let ((+ +))
+    (lambda (n) (+ n 1))))
+(define -1+
+  (let ((+ +))
+    (lambda (n) (+ n -1))))
+
+(define <? <)
+(define <=? <=)
+(define =? =)
+(define >? >)
+(define >=? >=)