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;;; -*- Log: code.log; Package: Lisp -*-
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;; If you want to use this code or any part of CMU Common Lisp, please contact
;;; Scott Fahlman or slisp-group@cs.cmu.edu.
;;;
(ext:file-comment
"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/filesys.lisp,v 1.103 2007/08/04 23:54:37 fgilham Exp $")
;;; **********************************************************************
;;;
;;; File system interface functions. This file is pretty UNIX specific.
;;; Written by William Lott
;;;
;;; **********************************************************************
(in-package "LISP")
(export '(truename probe-file user-homedir-pathname directory
rename-file delete-file file-write-date file-author))
(use-package "EXTENSIONS")
(in-package "EXTENSIONS")
(export '(print-directory complete-file ambiguous-files default-directory
purge-backup-files file-writable unix-namestring))
(in-package "LISP")
;;;; Unix pathname host support.
;;; Unix namestrings have the following format:
;;; namestring := [ directory ] [ file [ type [ version ]]]
;;; directory := [ "/" | search-list ] { file "/" }*
;;; search-list := [^:/]*:
;;; file := [^/]*
;;; type := "." [^/.]*
;;; version := ".*" | ".~" ([1-9]+[0-9]* | "*") "~"
;;; Note: this grammar is ambiguous. The string foo.bar.~5~ can be parsed
;;; as either just the file specified or as specifying the file, type, and
;;; version. Therefore, we use the following rules when confronted with
;;; an ambiguous file.type.version string:
;;; - If the first character is a dot, it's part of the file. It is not
;;; considered a dot in the following rules.
;;; - If there is only one dot, it separates the file and the type.
;;;
;;; - If there are multiple dots and the stuff following the last dot
;;; is a valid version, then that is the version and the stuff between
;;; the second to last dot and the last dot is the type.
;;;
;;; Wildcard characters:
;;;
;;; If the directory, file, type components contain any of the following
;;; characters, it is considered part of a wildcard pattern and has the
;;; following meaning.
;;;
;;; ? - matches any character
;;; * - matches any zero or more characters.
;;; [abc] - matches any of a, b, or c.
;;; {str1,str2,...,strn} - matches any of str1, str2, ..., or strn.
;;;
;;; Any of these special characters can be preceded by a backslash to
;;; cause it to be treated as a regular character.
(defun remove-backslashes (namestr start end)
"Remove any occurrences of \\ from the string because we've already
checked for whatever may have been backslashed."
(declare (type simple-base-string namestr)
(type index start end))
(let* ((result (make-string (- end start)))
(dst 0)
(quoted nil))
(do ((src start (1+ src)))
((= src end))
(cond (quoted
(setf (schar result dst) (schar namestr src))
(setf quoted nil)
(incf dst))
(t
(let ((char (schar namestr src)))
(cond ((char= char #\\)
(setq quoted t))
(t
(setf (schar result dst) char)
(incf dst)))))))
(when quoted
(error 'namestring-parse-error
:complaint "Backslash in bad place."
:namestring namestr
:offset (1- end)))
(shrink-vector result dst)))
(defvar *ignore-wildcards* nil
"If non-NIL, Unix shell-style wildcards are ignored when parsing
pathname namestrings. They are also ignored when computing
namestrings for pathname objects. Thus, *, ?, etc. are not
wildcards when parsing a namestring, and are not escaped when
printing pathnames.")
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(defun maybe-make-pattern (namestr start end)
(declare (type simple-base-string namestr)
(type index start end))
(if *ignore-wildcards*
(subseq namestr start end)
(collect ((pattern))
(let ((quoted nil)
(any-quotes nil)
(last-regular-char nil)
(index start))
(flet ((flush-pending-regulars ()
(when last-regular-char
(pattern (if any-quotes
(remove-backslashes namestr
last-regular-char
index)
(subseq namestr last-regular-char index)))
(setf any-quotes nil)
(setf last-regular-char nil))))
(loop
(when (>= index end)
(return))
(let ((char (schar namestr index)))
(cond (quoted
(incf index)
(setf quoted nil))
((char= char #\\)
(setf quoted t)
(setf any-quotes t)
(unless last-regular-char
(setf last-regular-char index))
(incf index))
((char= char #\?)
(flush-pending-regulars)
(pattern :single-char-wild)
(incf index))
((char= char #\*)
(flush-pending-regulars)
(pattern :multi-char-wild)
(incf index))
((char= char #\[)
(flush-pending-regulars)
(let ((close-bracket
(position #\] namestr :start index :end end)))
(unless close-bracket
(error 'namestring-parse-error
:complaint "``['' with no corresponding ``]''"
:namestring namestr
:offset index))
(pattern (list :character-set
(subseq namestr
(1+ index)
close-bracket)))
(setf index (1+ close-bracket))))
(t
(unless last-regular-char
(setf last-regular-char index))
(incf index)))))
(flush-pending-regulars)))
(cond ((null (pattern))
"")
((null (cdr (pattern)))
(let ((piece (first (pattern))))
(typecase piece
((member :multi-char-wild) :wild)
(simple-string piece)
(t
(make-pattern (pattern))))))
(t
(make-pattern (pattern)))))))
;;; extract-name-type-and-version -- Internal.
;;;
(defun extract-name-type-and-version (namestr start end)
(declare (type simple-base-string namestr)
(type index start end))
(labels
((explicit-version (namestr start end)
;; Look for something like "~*~" at the end of the
;; namestring, where * can be #\* or some digits. This
;; denotes a version.
;;(format t "explicit-version ~S ~A ~A~%" namestr start end)
(cond ((or (< (- end start) 4)
(and (char/= (schar namestr (1- end)) #\~)
(char/= (schar namestr (1- end)) #\*)))
;; No explicit version given, so return NIL to
;; indicate we don't want file versions, unless
;; requested in other ways.
((and (not *ignore-wildcards*)
(char= (schar namestr (- end 2)) #\*)
(char= (schar namestr (- end 3)) #\~)
(char= (schar namestr (- end 4)) #\.))
;; Found "~*~", so it's a wild version
(values :wild (- end 4)))
(t
;; Look for a version number. Start at the end, just
;; before the ~ and keep looking for digits. If the
;; first non-digit is ~, and the leading character is
;; a non-zero digit, we have a version number, so get
;; it. If not, we didn't find a version number, so we
;; call it :newest
(do ((i (- end 2) (1- i)))
((< i (+ start 1))
;;(format t "case 3: ~A ~A~%" :newest end)
(values :newest end))
(let ((char (schar namestr i)))
(when (eql char #\~)
(return (if (char= (schar namestr (1- i)) #\.)
(if (char= (schar namestr (1+ i)) #\0)
(values nil end)
(values (parse-integer namestr :start (1+ i)
:end (1- end))
(1- i)))
(values :newest end))))
(unless (char<= #\0 char #\9)
;; It's not a digit. Give up, and say the
;; version is NIL.
;;(format t "case 3 return: ~A ~A~%" nil end)
(return (values nil end))))))))
(any-version (namestr start end)
;; process end of string looking for a version candidate.
(multiple-value-bind (version where)
(cond ((not (eq version :newest))
(values version where))
((and (not *ignore-wildcards*)
(>= (- end 2) start)
(char= (schar namestr (- end 1)) #\*)
(char= (schar namestr (- end 2)) #\.)
(find #\. namestr
:start (min (1+ start) (- end 2))
:end (- end 2)))
(values :wild (- end 2)))
(t (values version where)))))
(any-type (namestr start end)
;; Process end of string looking for a type. A leading "."
;; is part of the name.
(let ((where (position #\. namestr
:start (min (1+ start) end)
:end end :from-end t)))
(when where
(values where end))))
(any-name (namestr start end)
(declare (ignore namestr))
(values start end)))
(multiple-value-bind (version vstart)
(any-version namestr start end)
(multiple-value-bind (tstart tend)
(any-type namestr start vstart)
(multiple-value-bind (nstart nend)
(any-name namestr start (or tstart vstart))
(values
(maybe-make-pattern namestr nstart nend)
(and tstart (maybe-make-pattern namestr (1+ tstart) tend))
version))))))
;;; Take a string and return a list of cons cells that mark the char
;;; separated subseq. The first value t if absolute directories location.
;;;
(defun split-at-slashes (namestr start end)
(declare (type simple-base-string namestr)
(type index start end))
(let ((absolute (and (/= start end)
(char= (schar namestr start) #\/))))
(when absolute
(incf start))
;; Next, split the remainder into slash separated chunks.
(collect ((pieces))
(loop
(let ((slash (position #\/ namestr :start start :end end)))
(pieces (cons start (or slash end)))
(unless slash
(setf start (1+ slash))))
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(values absolute (pieces)))))
(defun maybe-extract-search-list (namestr start end)
(declare (type simple-base-string namestr)
(type index start end))
(let ((quoted nil))
(do ((index start (1+ index)))
((= index end)
(values nil start))
(if quoted
(setf quoted nil)
(case (schar namestr index)
(#\\
(setf quoted t))
(#\:
(return (values (remove-backslashes namestr start index)
(1+ index)))))))))
(defun parse-unix-namestring (namestr start end)
(declare (type simple-base-string namestr)
(type index start end))
(multiple-value-bind
(absolute pieces)
(split-at-slashes namestr start end)
(let ((search-list
(if absolute
nil
(let ((first (car pieces)))
(multiple-value-bind
(maybe-extract-search-list namestr
(car first) (cdr first))
(when search-list
;; Lose if this search-list is already defined as
;; a logical host. Since the syntax for
;; search-lists and logical pathnames are the
;; same, we can't allow the creation of one when
;; the other is defined.
(when (find-logical-host search-list nil)
(error "~A already names a logical host" search-list))
(setf absolute t)
(setf (car first) new-start))
search-list)))))
(let* ((tail (car (last pieces)))
(tail-start (car tail))
(tail-end (cdr tail)))
(unless (= tail-start tail-end)
(setf pieces (butlast pieces))
(cond ((string= namestr ".." :start1 tail-start :end1 tail-end)
;; ".." is a directory. Add this piece to the
;; list of pieces, and make the name/type/version
;; nil.
(setf pieces (append pieces (list (cons tail-start tail-end))))
(values nil nil nil))
((not (find-if-not #'(lambda (c)
(char= c #\.))
namestr :start tail-start :end tail-end))
;; Got a bunch of dots. Make it a file of the same name, and type nil.
(values (subseq namestr tail-start tail-end) nil nil))
(t
(extract-name-type-and-version namestr tail-start tail-end)))))
;; PVE: Make sure there are no illegal characters in the name
;; such as #\Null and #\/.
(when (and (stringp name)
(find-if #'(lambda (x)
(or (char= x #\Null) (char= x #\/)))
name))
(error 'parse-error))
;; Now we have everything we want. So return it.
(values nil ; no host for unix namestrings.
nil ; no devices for unix namestrings.
(collect ((dirs))
(when search-list
(dirs (intern-search-list search-list)))
(dolist (piece pieces)
(let ((piece-start (car piece))
(piece-end (cdr piece)))
(unless (= piece-start piece-end)
(cond ((string= namestr ".." :start1 piece-start
:end1 piece-end)
(dirs :up))
((string= namestr "**" :start1 piece-start
:end1 piece-end)
(dirs :wild-inferiors))
(t
(dirs (maybe-make-pattern namestr
piece-start
piece-end)))))))
(cond (absolute
(cons :absolute (dirs)))
((dirs)
;; "." in a :relative directory is the same
;; as if it weren't there, so remove them.
(cons :relative (delete "." (dirs) :test #'equal)))
;; If there is no directory and the name is
;; ".", we really got directory ".", so make it so.
(if (equal name ".")
(list :relative)
nil))))
;; A file with name "." can't be the name of file on
;; Unix because it's a directory. This was handled
;; above, so we can just set the name to nil.
(if (equal name ".")
nil
name)
type
version)))))
(defun unparse-unix-host (pathname)
(declare (type pathname pathname)
(ignore pathname))
;; this host designator needs to be recognized as a physical host in
;; PARSE-NAMESTRING. Until sbcl-0.7.3.x, we had "Unix" here, but
;; that's a valid Logical Hostname, so that's a bad choice. -- CSR,
"")
(defun unparse-unix-piece (thing)
(etypecase thing
((member :wild) "*")
((member :unspecific)
;; CLHS 19.2.2.2.3.1 says "That is, both nil and :unspecific
;; cause the component not to appear in the namestring."
"")
(simple-string
(if *ignore-wildcards*
thing
(let* ((srclen (length thing))
(dstlen srclen))
(dotimes (i srclen)
(case (schar thing i)
((#\* #\? #\[)
(incf dstlen))))
(let ((result (make-string dstlen))
(dst 0))
(dotimes (src srclen)
(let ((char (schar thing src)))
(case char
((#\* #\? #\[)
(setf (schar result dst) #\\)
(incf dst)))
(setf (schar result dst) char)
(incf dst)))
result))))
(pattern
(collect ((strings))
(dolist (piece (pattern-pieces thing))
(etypecase piece
(simple-string
(strings piece))
(symbol
(ecase piece
(:multi-char-wild
(strings "*"))
(:single-char-wild
(strings "?"))))
(cons
(case (car piece)
(:character-set
(strings "[")
(strings (second piece))
(strings "]"))
(t
(error "Invalid pattern piece: ~S" piece))))))
(apply #'concatenate
'simple-string
(strings))))))
(defun unparse-unix-directory-list (directory)
(declare (type list directory))
(collect ((pieces))
(when directory
(ecase (pop directory)
(:absolute
(cond ((search-list-p (car directory))
(pieces (search-list-name (pop directory)))
(pieces ":"))
(t
(pieces "/"))))
(:relative
;; Nothing special, except if we were given '(:relative).
(unless directory
(pieces "./"))
))
(dolist (dir directory)
(typecase dir
((member :up)
(pieces "../"))
((member :back)
(error ":BACK cannot be represented in namestrings."))
((member :wild-inferiors)
(pieces "**/"))
((or simple-string pattern (eql :wild))
(pieces (unparse-unix-piece dir))
(pieces "/"))
(t
(error "Invalid directory component: ~S" dir)))))
(apply #'concatenate 'simple-string (pieces))))
(defun unparse-unix-directory (pathname)
(declare (type pathname pathname))
(unparse-unix-directory-list (%pathname-directory pathname)))
(defun unparse-unix-file (pathname)
(declare (type pathname pathname))
(collect ((strings))
(let* ((name (%pathname-name pathname))
(type (%pathname-type pathname))
(type-supplied (not (or (null type) (eq type :unspecific))))
(logical-p (logical-pathname-p pathname))
(version (%pathname-version pathname))
(member version (if logical-p
'(:unspecific)
'(:newest
:unspecific)))))))
(when (stringp name)
(when (find #\/ name)
(error "Cannot specify a directory separator in a pathname name: ~S" name))
(when (and (not type-supplied)
(find #\. name :start 1))
;; A single leading dot is ok.
(error "Cannot specify a dot in a pathname name without a pathname type: ~S" name))
(when (or (string= ".." name)
(string= "." name))
(error "Invalid value for a pathname name: ~S" name)))
(strings (unparse-unix-piece name)))
(when type-supplied
(unless name
(error "Cannot specify the type without a file: ~S" pathname))
(when (stringp type)
(when (find #\/ type)
(error "Cannot specify a directory separator in a pathname type: ~S" type))
(when (find #\. type)
(error "Cannot specify a dot in a pathname type: ~S" type)))
(strings ".")
(strings (unparse-unix-piece type)))
(when (and (not (member version '(nil :newest :unspecific)))
(not name))
;; We don't want version without a name, because when we try
;; to read #p".~*~" back, the name is "", not NIL.
(error "Cannot specify a version without a file: ~S" pathname))
(when version-supplied
(strings (if (eq version :wild)
(if logical-p ".*" ".~*~")
(and (strings) (apply #'concatenate 'simple-string (strings)))))
(defun unparse-unix-namestring (pathname)
(declare (type pathname pathname))
(concatenate 'simple-string
(unparse-unix-directory pathname)
(unparse-unix-file pathname)))
(defun unparse-unix-enough (pathname defaults)
(declare (type pathname pathname defaults))
(flet ((lose ()
(error "~S cannot be represented relative to ~S"
pathname defaults)))
;; Only the first path in a search-list is considered.
(enumerate-search-list (pathname pathname)
(enumerate-search-list (defaults defaults)
(collect ((strings))
(let* ((pathname-directory (%pathname-directory pathname))
(defaults-directory (%pathname-directory defaults))
(prefix-len (length defaults-directory))
(result-dir
(cond ((null pathname-directory)
;; No directory, so relative to default. But
;; if we're relative to default, NIL is as
;; good as '(:relative) and it results in a
;; shorter namestring.
#+nil (list :relative)
nil)
((and (>= prefix-len 1)
(>= (length pathname-directory) prefix-len)
(compare-component (subseq pathname-directory
0 prefix-len)
defaults-directory))
;; Pathname starts with a prefix of default,
;; which also means both are either :relative
;; or :absolute directories. So just use a
;; relative directory from then on out.
(let ((dir-tail (nthcdr prefix-len pathname-directory)))
;; If both directories are identical, don't
;; return just :relative. Returning NIL
;; results in a shorter string.
(if dir-tail
(cons :relative dir-tail)
nil)))
((and (eq (car pathname-directory) :relative)
(not (eq (car defaults-directory) :absolute)))
;; Can't represent a relative directory
;; relative to an absolute directory. But
;; there's no problem if both are relative;
;; we just return our path.
pathname-directory)
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((eq (car pathname-directory) :absolute)
;; We are an absolute pathname, so we can just use it.
pathname-directory)
(t
;; We are a relative directory. So we lose.
(lose)))))
(strings (unparse-unix-directory-list result-dir)))
(let* ((pathname-version (%pathname-version pathname))
(version-needed (and pathname-version
(not (eq pathname-version :newest))))
(pathname-type (%pathname-type pathname))
(type-needed (or version-needed
(and pathname-type
(not (eq pathname-type :unspecific)))))
(pathname-name (%pathname-name pathname))
(name-needed (or type-needed
(and pathname-name
(not (compare-component pathname-name
(%pathname-name
defaults)))))))
(when name-needed
(unless pathname-name (lose))
(strings (unparse-unix-piece pathname-name)))
(when type-needed
(when (or (null pathname-type) (eq pathname-type :unspecific))
(lose))
(strings ".")
(strings (unparse-unix-piece pathname-type)))
(when version-needed
(typecase pathname-version
((member :wild)
(strings ".~*~"))
(integer
(strings (format nil ".~~~D~~" pathname-version)))
(t
(lose)))))
(return-from unparse-unix-enough (apply #'concatenate 'simple-string (strings))))))))
(defstruct (unix-host
(:include host
(:parse #'parse-unix-namestring)
(:unparse #'unparse-unix-namestring)
(:unparse-host #'unparse-unix-host)
(:unparse-directory #'unparse-unix-directory)
(:unparse-file #'unparse-unix-file)
(:unparse-enough #'unparse-unix-enough)
(:customary-case :lower))
(:make-load-form-fun make-unix-host-load-form))
)
(defvar *unix-host* (make-unix-host))
(defun make-unix-host-load-form (host)
(declare (ignore host))
'*unix-host*)
;;;; Wildcard matching stuff.
(defmacro enumerate-matches ((var pathname &optional result
&key (verify-existance t) (follow-links t))
&body body)
(let ((body-name (gensym)))
`(block nil
(flet ((,body-name (,var)
,@body))
(%enumerate-matches (pathname ,pathname)
,verify-existance ,follow-links
#',body-name)
,result))))
(defun %enumerate-matches (pathname verify-existance follow-links function)
(when (pathname-type pathname)
(unless (pathname-name pathname)
(error "Cannot supply a type without a name:~% ~S" pathname)))
(let ((directory (pathname-directory pathname)))
(if directory
(ecase (car directory)
(:absolute
(%enumerate-directories "/" (cdr directory) pathname
verify-existance follow-links
nil function))
(:relative
(%enumerate-directories "" (cdr directory) pathname
verify-existance follow-links
nil function)))
(%enumerate-files "" pathname verify-existance function))))
;;; %enumerate-directories -- Internal
;;;
;;; The directory node and device numbers are maintained for the current path
;;; during the search for the detection of path loops upon :wild-inferiors.
;;;
(defun %enumerate-directories (head tail pathname verify-existance
follow-links nodes function)
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(macrolet ((unix-xstat (name)
`(if follow-links
(unix:unix-stat ,name)
(unix:unix-lstat ,name)))
(with-directory-node-noted ((head) &body body)
`(multiple-value-bind (res dev ino mode)
(unix-xstat ,head)
(when (and res (eql (logand mode unix:s-ifmt) unix:s-ifdir))
(let ((nodes (cons (cons dev ino) nodes)))
,@body))))
(do-directory-entries ((name directory) &body body)
`(let ((dir (unix:open-dir ,directory)))
(when dir
(unwind-protect
(loop
(let ((,name (unix:read-dir dir)))
(cond ((null ,name)
(return))
((string= ,name "."))
((string= ,name ".."))
(t
,@body))))
(unix:close-dir dir))))))
(if tail
(let ((piece (car tail)))
(etypecase piece
(simple-string
(let ((head (concatenate 'string head piece)))
(with-directory-node-noted (head)
(%enumerate-directories (concatenate 'string head "/")
(cdr tail) pathname
verify-existance follow-links
nodes function))))
((member :wild-inferiors)
(%enumerate-directories head (rest tail) pathname
verify-existance follow-links
nodes function)
(do-directory-entries (name head)
(let ((subdir (concatenate 'string head name)))
(multiple-value-bind (res dev ino mode)
(unix-xstat subdir)
(declare (type (or fixnum null) mode))
(when (and res (eql (logand mode unix:s-ifmt) unix:s-ifdir))
(unless (dolist (dir nodes nil)
(when (and (eql (car dir) dev)
(eql (cdr dir) ino))
(return t)))
(let ((nodes (cons (cons dev ino) nodes))
(subdir (concatenate 'string subdir "/")))
(%enumerate-directories subdir tail pathname
verify-existance follow-links
nodes function))))))))
((or pattern (member :wild))
(do-directory-entries (name head)
(when (or (eq piece :wild) (pattern-matches piece name))
(let ((subdir (concatenate 'string head name)))
(multiple-value-bind (res dev ino mode)
(unix-xstat subdir)
(declare (type (or fixnum null) mode))
(when (and res
(eql (logand mode unix:s-ifmt) unix:s-ifdir))
(let ((nodes (cons (cons dev ino) nodes))
(subdir (concatenate 'string subdir "/")))
(%enumerate-directories subdir (rest tail) pathname
verify-existance follow-links
nodes function))))))))
((member :up)
(let ((head (concatenate 'string head "..")))
(with-directory-node-noted (head)
(%enumerate-directories (concatenate 'string head "/")
(rest tail) pathname
verify-existance follow-links
nodes function))))))
(%enumerate-files head pathname verify-existance function))))
(defun %enumerate-files (directory pathname verify-existance function)
(declare (simple-string directory))
(let ((name (%pathname-name pathname))
(type (%pathname-type pathname))
(version (%pathname-version pathname)))
(cond ((member name '(nil :unspecific))
(when (or (not verify-existance)
(funcall function directory)))
((or (pattern-p name)
(pattern-p type)
(when dir
(unwind-protect
(loop
(unless (or (string= file ".")
(string= file ".."))
(multiple-value-bind
(file-name file-type file-version)
(let ((*ignore-wildcards* t))
(extract-name-type-and-version
file 0 (length file)))
;; Match also happens if the file has
;; no explicit version and we're asking
;; for version :NEWEST, since that's
;; what no version means.
(when (and (components-match file-name name)
(components-match file-type type)
(or (components-match file-version
version)
(and (eq file-version nil)
(eq version :newest))))
(funcall function
(concatenate 'string
directory
file)))))
(return))))
(t
(let ((file (concatenate 'string directory name)))
(unless (or (null type) (eq type :unspecific))
(setf file (concatenate 'string file "." type)))
(unless (member version '(nil :newest :wild :unspecific))
(setf file (concatenate 'string file ".~"
(quick-integer-to-string version)
"~")))
(when (or (not verify-existance)
(unix:unix-file-kind file t))
(funcall function file)))))))
(declare (type integer n))
(cond ((not (fixnump n))
(write-to-string n :base 10 :radix nil))
((zerop n) "0")
((eql n 1) "1")
((minusp n)
(concatenate 'simple-string "-"
(the simple-string (quick-integer-to-string (- n)))))
(t
(do* ((len (1+ (truncate (integer-length n) 3)))
(res (make-string len))
(i (1- len) (1- i))
(q n)
(r 0))
((zerop q)
(incf i)
(replace res res :start2 i :end2 len)
(shrink-vector res (- len i)))
(fixnum len i r q))
(multiple-value-setq (q r) (truncate q 10))
(setf (schar res i) (schar "0123456789" r))))))
;;;; UNIX-NAMESTRING -- public
(defun unix-namestring (pathname &optional (for-input t) executable-only)
"Convert PATHNAME into a string that can be used with UNIX system calls.
Search-lists and wild-cards are expanded. If optional argument
FOR-INPUT is true and PATHNAME doesn't exist, NIL is returned.
If optional argument EXECUTABLE-ONLY is true, NIL is returned
unless an executable version of PATHNAME exists."
;; toy@rtp.ericsson.se: Let unix-namestring also handle logical
;; pathnames too.
(let ((path (let ((lpn (pathname pathname)))
(if (logical-pathname-p lpn)
(namestring (translate-logical-pathname lpn))
pathname))))
(enumerate-search-list
(collect ((names))
(enumerate-matches (name pathname nil :verify-existance for-input
:follow-links t)
(when (or (not executable-only)
(and (eq (unix:unix-file-kind name) :file)
(unix:unix-access name unix:x_ok)))
(names name)))
(let ((names (names)))
(when names
(when (cdr names)
(error 'simple-file-error
:format-control "~S is ambiguous:~{~% ~A~}"
:format-arguments (list pathname names)))
;;;; TRUENAME and PROBE-FILE.
;;; Another silly file function trivially different from another function.
;;;
(defun truename (pathname)
"Return the pathname for the actual file described by the pathname
An error of type file-error is signalled if no such file exists,
or the pathname is wild."
(if (wild-pathname-p pathname)
(error 'simple-file-error
:format-control "Bad place for a wild pathname."
:pathname pathname)
(let ((result (probe-file pathname)))
(unless result
(error 'simple-file-error
:pathname pathname
:format-control "The file ~S does not exist."
:format-arguments (list (namestring pathname))))
result)))
;;;
(defun probe-file (pathname)
"Return a pathname which is the truename of the file if it exists, NIL
otherwise. An error of type file-error is signalled if pathname is wild."
(if (wild-pathname-p pathname)
(error 'simple-file-error
:pathname pathname
:format-control "Bad place for a wild pathname.")
(let ((namestring (unix-namestring (merge-pathnames pathname) t)))
(when (and namestring (unix:unix-file-kind namestring))
(let ((truename (unix:unix-resolve-links
(unix:unix-maybe-prepend-current-directory
namestring))))
(when truename
(let ((*ignore-wildcards* t))
(pathname (unix:unix-simplify-pathname truename)))))))))
;;;; Other random operations.
;;; Rename-File -- Public
;;;
(defun rename-file (file new-name)
"Rename File to have the specified New-Name. If file is a stream open to a
file, then the associated file is renamed."
(let* ((original (truename file))
(original-namestring (unix-namestring original t))
(new-name (merge-pathnames new-name original))
(new-namestring (unix-namestring new-name nil)))
(unless new-namestring
(error 'simple-file-error
:pathname new-name
:format-control "~S can't be created."
:format-arguments (list new-name)))
(multiple-value-bind (res error)
new-namestring)
(unless res
(error 'simple-file-error
:pathname new-name
:format-control "Failed to rename ~A to ~A: ~A"
:format-arguments (list original new-name
(unix:get-unix-error-msg error))))
(when (streamp file)
(file-name file new-namestring))
(values new-name original (truename new-name)))))
;;; Delete-File -- Public
;;;
;;; Delete the file, Man.
;;;
(defun delete-file (file)
"Delete the specified file."
(let ((namestring (unix-namestring file t)))
;; Close the file, but don't try to revert or anything. We want
;; to delete it, man!
(close file))
(unless namestring
(error 'simple-file-error
:pathname file
:format-control "~S doesn't exist."
:format-arguments (list file)))
(multiple-value-bind (res err) (unix:unix-unlink namestring)
(error 'simple-file-error
:pathname namestring
:format-control "Could not delete ~A: ~A."
:format-arguments (list namestring
(unix:get-unix-error-msg err))))))
;;; Purge-Backup-Files -- Public
(defun purge-backup-files (pathname &optional (keep 0))
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"Delete old versions of files matching the given Pathname,
optionally keeping some of the most recent old versions."
(declare (type (or pathname string stream) pathname)
(type (integer 0 *) keep))
(let ((hash (make-hash-table :test 'equal)))
(enumerate-search-list
(path (make-pathname :version :wild :defaults pathname))
(clrhash hash)
(enumerate-matches (name path nil :follow-links nil)
(let ((dot (position #\. name :from-end t))
(len (length name)))
(when (and dot
(> len (+ dot 3))
(char= (char name (1+ dot)) #\~)
(char= (char name (1- len)) #\~)
(eq (unix:unix-file-kind name) :file))
(multiple-value-bind (version next)
(parse-integer name :start (+ dot 2) :end (1- len)
:junk-allowed t)
(when (and version (= next (1- len)))
(push (cons version name)
(gethash (subseq name 0 dot) hash '())))))))
(maphash (lambda (key value)
(declare (ignore key))
(mapc #'unix:unix-unlink
(mapcar #'cdr (nthcdr keep
(sort value #'> :key #'car)))))
hash))))