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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 >=? >=)
-