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author | Bryan Newbold <bnewbold@robocracy.org> | 2017-02-20 00:05:25 -0800 |
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committer | Bryan Newbold <bnewbold@robocracy.org> | 2017-02-20 00:05:25 -0800 |
commit | 8ffbc2df0fde83082610149d24e594c1cd879f4a (patch) | |
tree | a2be9aad5101c5e450ad141d15c514bc9c2a2963 /sc4opt.scm | |
download | slib-8ffbc2df0fde83082610149d24e594c1cd879f4a.tar.gz slib-8ffbc2df0fde83082610149d24e594c1cd879f4a.zip |
Import Upstream version 2a6upstream/2a6
Diffstat (limited to 'sc4opt.scm')
-rw-r--r-- | sc4opt.scm | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sc4opt.scm b/sc4opt.scm new file mode 100644 index 0000000..176d7f1 --- /dev/null +++ b/sc4opt.scm @@ -0,0 +1,53 @@ +;"sc4opt.scm" Implementation of optional Scheme^4 functions for IEEE Scheme +;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. + +;;; Some of these functions may be already defined in your Scheme. +;;; Comment out those definitions for functions which are already defined. + +;;; This code conforms to: William Clinger and Jonathan Rees, editors. +;;; Revised^4 Report on the Algorithmic Language Scheme. + +(define (list-tail l p) + (if (< p 1) l (list-tail (cdr l) (- p 1)))) + +(define (string->list s) + (do ((i (- (string-length s) 1) (- i 1)) + (l '() (cons (string-ref s i) l))) + ((< i 0) l))) + +(define (list->string l) (apply string l)) + +(define string-copy string-append) + +(define (string-fill! s obj) + (do ((i (- (string-length s) 1) (- i 1))) + ((< i 0)) + (string-set! s i obj))) + +(define (list->vector l) (apply vector l)) + +(define (vector->list s) + (do ((i (- (vector-length s) 1) (- i 1)) + (l '() (cons (vector-ref s i) l))) + ((< i 0) l))) + +(define (vector-fill! s obj) + (do ((i (- (vector-length s) 1) (- i 1))) + ((< i 0)) + (vector-set! s i obj))) |