;"sc2.scm" Implementation of rev2 procedures eliminated in subsequent versions. ; Copyright (C) 1991, 1993 Aubrey Jaffer ; ;Permission to copy this software, to modify it, to redistribute it, ;to distribute modified versions, 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 warranty 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 >=? >=)