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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 1.62 2001/03/11 22:00:38 pw 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
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 := ".*" | ".~" ([0-9]+ | "*") "~"
;;; Note: this grammer 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 seperates 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 preceeded by a backslash to
;;; cause it to be treated as a regular character.
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(defun remove-backslashes (namestr start end)
"Remove and occurences of \\ from the string because we've already
checked for whatever they 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)
(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))
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(labels
((explicit-version (namestr start end)
(cond ((or (< (- end start) 5)
(char/= (schar namestr (1- end)) #\~))
(values :newest end))
((and (char= (schar namestr (- end 2)) #\*)
(char= (schar namestr (- end 3)) #\~)
(char= (schar namestr (- end 4)) #\.))
(values :wild (- end 4)))
(t
(do ((i (- end 2) (1- i)))
((< i (+ start 2)) (values :newest end))
(let ((char (schar namestr i)))
(when (eql char #\~)
(return (if (char= (schar namestr (1- i)) #\.)
(values (parse-integer namestr :start (1+ i)
:end (1- end))
(1- i))
(values :newest end))))
(unless (char<= #\0 char #\9)
(return (values :newest end))))))))
(any-version (namestr start end)
;; process end of string looking for a version candidate.
(multiple-value-bind (version where)
(explicit-version namestr start end)
(cond ((not (eq version :newest))
(values version where))
((and (char= (schar namestr (- end 1)) #\*)
(char= (schar namestr (- end 2)) #\.)
(find #\. namestr :start start :end (- end 2)))
(values :wild (- end 2)))
(t (values version where)))))
(any-type (namestr start end)
;; process end of string looking for a type.
(let ((where (position #\. namestr :start start :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 seperated 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
(search-list new-start)
(maybe-extract-search-list namestr
(car first) (cdr first))
(when search-list
(setf absolute t)
(setf (car first) new-start))
search-list)))))
(multiple-value-bind
(name type version)
(let* ((tail (car (last pieces)))
(tail-start (car tail))
(tail-end (cdr tail)))
(unless (= tail-start tail-end)
(setf pieces (butlast pieces))
(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)
(cons :relative (dirs)))
(t
nil)))
name
type
version)))))
(defun unparse-unix-host (pathname)
(declare (type pathname pathname)
(ignore pathname))
"Unix")
(defun unparse-unix-piece (thing)
(etypecase thing
((member :wild) "*")
(simple-string
(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 "?"))))
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(cons
(case (car piece)
(:character-set
(strings "[")
(strings (cdr 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.
))
(dolist (dir directory)
(typecase dir
((member :up)
(pieces "../"))
((member :back)
(error ":BACK cannot be represented in namestrings."))
((member :wild-inferiors)
(pieces "**/"))
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((or simple-string pattern)
(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))))
(version (%pathname-version pathname))
(version-supplied (not (or (null version) (eq version :newest)))))
(when name
(strings (unparse-unix-piece name)))
(when type-supplied
(unless name
(error "Cannot specify the type without a file: ~S" pathname))
(strings ".")
(strings (unparse-unix-piece type)))
(when version-supplied
(strings (if (eq version :wild)
(format nil ".~~~D~~" version)))))
(and (strings) (apply #'concatenate 'simple-string (strings)))))
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(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)))
(collect ((strings))
(let* ((pathname-directory (%pathname-directory pathname))
(defaults-directory (%pathname-directory defaults))
(prefix-len (length defaults-directory))
(result-dir
(cond ((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. So just
;; use a relative directory from then on out.
(cons :relative (nthcdr prefix-len pathname-directory)))
((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 ".~*~"))
(strings (format nil ".~~~D~~" pathname-version)))
(t
(lose)))))
(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 paths 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)
(eq name :wild)
(eq type :wild))
(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)))
(when (and (components-match file-name name)
(components-match file-type type)
(components-match file-version
version))
(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))
(setf file (concatenate 'string file "."
(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)))
;;; If PATHNAME exists, return it's truename, otherwise NIL.
;;;
(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 signaled 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 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)))
(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))))))
;;; Return Home:, which is set up for us at initialization time.
;;;
(defun user-homedir-pathname (&optional host)
"Returns the home directory of the logged in user as a pathname.
This is obtained from the logical name \"home:\"."
;;; File-Write-Date -- Public
;;;
(defun file-write-date (file)
"Return file's creation date, or NIL if it doesn't exist.
An error of type file-error is signaled if file is a wild pathname"
(if (wild-pathname-p file)
(error 'simple-file-error
:pathname file
:format-control "Bad place for a wild pathname.")
(let ((name (unix-namestring file t)))
(when name
(multiple-value-bind
(res dev ino mode nlink uid gid rdev size atime mtime)
(unix:unix-stat name)
(declare (ignore dev ino mode nlink uid gid rdev size atime))
(when res
(+ unix-to-universal-time mtime)))))))
;;; File-Author -- Public
;;;
(defun file-author (file)
"Returns the file author as a string, or nil if the author cannot be
determined. Signals an error of type file-error if file doesn't exist,
or file is a wild pathname."
(if (wild-pathname-p file)
(error 'simple-file-error
:pathname file
"Bad place for a wild pathname.")
(let ((name (unix-namestring (pathname file) t)))
(unless name
(error 'simple-file-error
:pathname file
:format-control "~S doesn't exist."
:format-arguments (list file)))
(multiple-value-bind (winp dev ino mode nlink uid)
(unix:unix-stat name)
(declare (ignore dev ino mode nlink))
(if winp (lookup-login-name uid))))))
;;; DIRECTORY -- public.
;;;
(defun directory (pathname &key (all t) (check-for-subdirs t)
(truenamep t) (follow-links t))
"Returns a list of pathnames, one for each file that matches the given
pathname. Supplying :ALL as nil causes this to ignore Unix dot files. This
never includes Unix dot and dot-dot in the result. If :TRUENAMEP is NIL,
then symblolic links in the result are not expanded which is not the
default because TRUENAME does follow links, and the result pathnames are
defined to be the TRUENAME of the pathname (the truename of a link may well
be in another directory.) If FOLLOW-LINKS is NIL then symbolic links are
not followed."
(let ((results nil))
(enumerate-search-list
(pathname (merge-pathnames pathname
(make-pathname :name :wild
:type :wild
:version :wild)))
(enumerate-matches (name pathname nil :follow-links follow-links)
(when (or all
(let ((slash (position #\/ name :from-end t)))
(or (null slash)
(= (1+ slash) (length name))
(char/= (schar name (1+ slash)) #\.))))
(push name results))))
(let ((*ignore-wildcards* t))
(mapcar #'(lambda (name)
(let ((name (if (and check-for-subdirs
:directory))
(concatenate 'string name "/")
name)))
(if truenamep (truename name) (pathname name))))
(sort (delete-duplicates results :test #'string=) #'string<)))))
;;;; Printing directories.
;;; PRINT-DIRECTORY is exported from the EXTENSIONS package.
;;;
(defun print-directory (pathname &optional stream &key all verbose return-list)
"Like Directory, but prints a terse, multi-coloumn directory listing
instead of returning a list of pathnames. When :all is supplied and
non-nil, then Unix dot files are included too (as ls -a). When :vervose
is supplied and non-nil, then a long listing of miscellaneous
information is output one file per line."
(let ((*standard-output* (out-synonym-of stream))
(pathname pathname))
(if verbose
(print-directory-verbose pathname all return-list)
(print-directory-formatted pathname all return-list))))
(defun print-directory-verbose (pathname all return-list)
(let ((contents (directory pathname :all all :check-for-subdirs nil
:truenamep nil))
(result nil))
(format t "Directory of ~A :~%" (namestring pathname))
(dolist (file contents)
(let* ((namestring (unix-namestring file))
(tail (subseq namestring
(1+ (or (position #\/ namestring
:from-end t
:test #'char=)
-1)))))
(multiple-value-bind
(reslt dev-or-err ino mode nlink uid gid rdev size atime mtime)
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
(declare (ignore ino gid rdev atime)
(fixnum uid mode))
(cond (reslt
;;
;; Print characters for file modes.
(macrolet ((frob (bit name &optional sbit sname negate)
`(if ,(if negate
`(not (logbitp ,bit mode))
`(logbitp ,bit mode))
,(if sbit
`(if (logbitp ,sbit mode)
(write-char ,sname)
(write-char ,name))
`(write-char ,name))
(write-char #\-))))
(frob 15 #\d nil nil t)
(frob 8 #\r)
(frob 7 #\w)
(frob 6 #\x 11 #\s)
(frob 5 #\r)
(frob 4 #\w)
(frob 3 #\x 10 #\s)
(frob 2 #\r)
(frob 1 #\w)
(frob 0 #\x))
;;
;; Print the rest.
(multiple-value-bind (sec min hour date month year)
(get-decoded-time)
(declare (ignore sec min hour date month))
(format t "~2D ~8A ~8D ~12A ~A~@[/~]~%"
nlink
(or (lookup-login-name uid) uid)
size
(decode-universal-time-for-files mtime year)
tail
(= (logand mode unix:s-ifmt) unix:s-ifdir))))
(t (format t "Couldn't stat ~A -- ~A.~%"
tail
(push (if (= (logand mode unix:s-ifmt) unix:s-ifdir)
(pathname (concatenate 'string namestring "/"))
file)
result)))))
(nreverse result)))
(defun decode-universal-time-for-files (time current-year)
(multiple-value-bind (sec min hour day month year)
(decode-universal-time (+ time unix-to-universal-time))
(declare (ignore sec))
(format nil "~A ~2,' D ~:[ ~D~;~*~2,'0D:~2,'0D~]"
(svref '#("Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug"