/usr/share/acl2-6.3/books/oslib/catpath.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.
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; Copyright (C) 2013 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 authors: Jared Davis <jared@centtech.com>
; Sol Swords <sswords@centtech.com>
(in-package "OSLIB")
(include-book "cutil/define" :dir :system)
(local (include-book "misc/assert" :dir :system))
(define catpath ((basedir stringp
"Directory whose name should be extended, which may
or may not end with a slash. Idioms like @('~'),
@('~jared'), and @('..') will be preserved. The
empty string means the current directory.")
(filename stringp
"File or subdirectory name to append to @('basedir')"))
:returns (path "A new string like @('basedir/filename'). We only insert a
slash if @('basedir') does not end with a slash. We don't
normalize the path by collapsing @('..')."
stringp)
:parents (oslib)
:short "Basic concatenation operation for paths."
:long "<p>ACL2 includes a built-in function named @('extend-pathname') that
is similar to @('catpath'). In some ways ACL2's version is nicer than
@('catpath'). It sometimes cleans up the path and gets rid of @('..')
characters. But it also sometimes expands away symlinks, which you may not
want to do. At the time of this writing, @('extend-pathname') is not easy to
effectively bring into logic mode, but that may change in the future.</p>
<p>Our @('catpath') function is comparatively primitive. It doesn't try to
simplify the path in any way.</p>
<p>We assume Unix style paths, i.e., @('/') is the path separator. It's not
clear what we should do to support other systems like Windows.</p>"
(b* ((len (length basedir))
((when (or (int= len 0)
(eql (char basedir (- len 1)) #\/)))
(cat basedir filename)))
(cat basedir "/" filename)))
(local
(progn
;; Basic examples
(assert! (equal (catpath "" "foo.txt") "foo.txt"))
(assert! (equal (catpath "/" "foo.txt") "/foo.txt"))
(assert! (equal (catpath "~/" "foo.txt") "~/foo.txt"))
(assert! (equal (catpath "~/../" "foo.txt") "~/../foo.txt"))
(assert! (equal (catpath "~/../" "../") "~/../../"))
(assert! (equal (catpath "/home/jared" "foo.txt")
"/home/jared/foo.txt"))
(assert! (equal (catpath "/home/jared/" "foo.txt")
"/home/jared/foo.txt"))
))
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