/usr/share/acl2-6.3/books/system/extend-pathname.lisp is in acl2-books-source 6.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | ; Proof of termination for extend-pathname
; Copyright (C) 2012 Centaur Technology
;
; Contact:
; Centaur Technology Formal Verification Group
; 7600-C N. Capital of Texas Highway, Suite 300, Austin, TX 78731, USA.
; http://www.centtech.com/
;
; This program is free software; you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free Software
; Foundation; either version 2 of the License, or (at your option) any later
; version. This program is distributed in the hope that it will be useful but
; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
; more details. You should have received a copy of the GNU General Public
; License along with this program; if not, write to the Free Software
; Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
;
; Original author: Jared Davis <jared@centtech.com>
;
; This just proves that EXTEND-PATHNAME terminates. It doesn't look like we
; can verify its guards, because functions it calls don't have appropriate
; guards, e.g., remove-after-last-directory-separator obviously expects its
; argument to be a string but doesn't have any type/guard declaration for that.
(in-package "ACL2")
(set-state-ok t)
;; Substantially copied from VL/arithmetic
(local
(encapsulate ()
(local (in-theory (enable make-character-list)))
(defthm make-character-list-when-character-listp
(implies (character-listp x)
(equal (make-character-list x)
x)))
(defthm character-listp-of-make-character-list
(character-listp (make-character-list x)))
(defthm len-of-make-character-list
(equal (len (make-character-list x))
(len x)))))
(local (defthm coerce-inverse-1-better
(equal (coerce (coerce x 'string) 'list)
(if (stringp x)
nil
(make-character-list x)))
:hints(("Goal"
:use ((:instance acl2::completion-of-coerce
(acl2::x x)
(acl2::y 'string)))))))
(in-theory (disable coerce-inverse-1))
(local (defthm len-revappend
(equal (len (revappend x y))
(+ (len x) (len y)))))
(local (defthm len-first-n-ac
(equal (len (first-n-ac i l ac))
(+ (nfix i) (len ac)))))
(verify-termination remove-after-last-directory-separator)
(verify-termination merge-using-dot-dot)
(verify-termination our-merge-pathnames)
(verify-termination directory-of-absolute-pathname)
(verify-termination expand-tilde-to-user-home-dir)
(verify-termination extend-pathname)
|