/[cmucl]/src/code/fd-stream.lisp
ViewVC logotype

Contents of /src/code/fd-stream.lisp

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.4.1.2 - (hide annotations) (vendor branch)
Sun May 27 16:44:30 1990 UTC (23 years, 10 months ago) by wlott
Changes since 1.4.1.1: +3 -2 lines
Had the arguments to copy-from-system-area backwards in string-from-sap.
1 ram 1.1 ;;; -*- Log: code.log; Package: LISP -*-
2    
3     ;;; **********************************************************************
4     ;;; This code was written as part of the Spice Lisp project at
5     ;;; Carnegie-Mellon University, and has been placed in the public domain.
6     ;;; If you want to use this code or any part of Spice Lisp, please contact
7     ;;; Scott Fahlman (FAHLMAN@CMUC).
8     ;;; **********************************************************************
9     ;;;
10     ;;; Streams for UNIX file descriptors.
11     ;;;
12     ;;; Written by William Lott, July 1989 - January 1990.
13     ;;;
14     ;;; **********************************************************************
15    
16    
17     (in-package "SYSTEM")
18    
19     (export '(fd-stream fd-stream-p fd-stream-fd make-fd-stream
20     beep *beep-function*
21     output-raw-bytes
22     *tty* *stdin* *stdout* *stderr*))
23    
24    
25     (in-package "EXTENSIONS")
26    
27     (export '(*backup-extension*))
28    
29    
30     (in-package "LISP")
31    
32    
33    
34     ;;;; Buffer manipulation routines.
35    
36     (defvar *available-buffers* ()
37     "List of available buffers. Each buffer is an dynamic alien.")
38    
39     (defconstant bytes-per-buffer (* 4 1024)
40     "Number of bytes per buffer.")
41    
42     ;;; NEXT-AVAILABLE-BUFFER -- Internal.
43     ;;;
44     ;;; Returns the next available alien buffer, creating one if necessary.
45     ;;;
46     (proclaim '(inline next-available-buffer))
47     ;;;
48     (defun next-available-buffer ()
49     (if *available-buffers*
50     (pop *available-buffers*)
51 wlott 1.4.1.1 (allocate-system-memory bytes-per-buffer)))
52 ram 1.1
53    
54     ;;;; The FD-STREAM structure.
55    
56     (defstruct (fd-stream
57     (:print-function %print-fd-stream)
58     (:constructor %make-fd-stream)
59     (:include stream
60     (misc #'fd-stream-misc-routine)))
61    
62     (name nil) ; The name of this stream
63     (file nil) ; The file this stream is for
64     (original nil) ; The original file (for :if-exists :rename)
65     (delete-original nil) ; for :if-exists :rename-and-delete
66     (element-size 1) ; Number of bytes per element.
67 wlott 1.4.1.1 (element-type 'base-character) ; The type of element being transfered.
68 ram 1.1 (fd -1 :type fixnum) ; The file descriptor
69     (buffering :full) ; One of :none, :line, or :full
70     (char-pos nil) ; Character position if known.
71     (listen nil) ; T if we don't need to listen
72    
73     ;; The input buffer.
74     (unread nil)
75     (ibuf-sap nil)
76     (ibuf-length nil)
77     (ibuf-head 0 :type fixnum)
78     (ibuf-tail 0 :type fixnum)
79    
80     ;; The output buffer.
81     (obuf-sap nil)
82     (obuf-length nil)
83     (obuf-tail 0 :type fixnum)
84    
85     ;; Output flushed, but not written due to non-blocking io.
86     (output-later nil)
87     (handler nil))
88    
89     (defun %print-fd-stream (fd-stream stream depth)
90     (declare (ignore depth))
91     (format stream "#<Stream for ~A>"
92     (fd-stream-name fd-stream)))
93    
94    
95    
96     ;;;; Output routines and related noise.
97    
98     (defvar *output-routines* ()
99     "List of all available output routines. Each element is a list of the
100     element-type output, the kind of buffering, the function name, and the number
101     of bytes per element.")
102    
103     ;;; DO-OUTPUT-LATER -- internal
104     ;;;
105     ;;; Called by the server when we can write to the given file descriptor.
106     ;;; Attemt to write the data again. If it worked, remove the data from the
107     ;;; output-later list. If it didn't work, something is wrong.
108     ;;;
109     (defun do-output-later (stream)
110     (let* ((stuff (pop (fd-stream-output-later stream)))
111     (base (car stuff))
112     (start (cadr stuff))
113     (end (caddr stuff))
114 wlott 1.4.1.1 (reuse-sap (cadddr stuff))
115 ram 1.1 (length (- end start)))
116     (multiple-value-bind
117     (count errno)
118     (mach:unix-write (fd-stream-fd stream)
119     base
120     start
121     length)
122     (cond ((eql count length) ; Hot damn, it workded.
123 wlott 1.4.1.1 (when reuse-sap
124     (push base *available-buffers*)))
125 ram 1.1 ((not (null count)) ; Sorta worked.
126     (push (list base
127     (+ start count)
128 wlott 1.4.1.1 end)
129 ram 1.1 (fd-stream-output-later stream)))
130     ((= errno mach:ewouldblock)
131     (error "Write would have blocked, but SERVER told us to go."))
132     (t
133     (error "While writing ~S: ~A"
134     stream
135     (mach:get-unix-error-msg errno))))))
136     (unless (fd-stream-output-later stream)
137     (system:remove-fd-handler (fd-stream-handler stream))
138     (setf (fd-stream-handler stream) nil)))
139    
140     ;;; OUTPUT-LATER -- internal
141     ;;;
142     ;;; Arange to output the string when we can write on the file descriptor.
143     ;;;
144 wlott 1.4.1.1 (defun output-later (stream base start end reuse-sap)
145 ram 1.1 (cond ((null (fd-stream-output-later stream))
146     (setf (fd-stream-output-later stream)
147 wlott 1.4.1.1 (list (list base start end reuse-sap)))
148 ram 1.1 (setf (fd-stream-handler stream)
149     (system:add-fd-handler (fd-stream-fd stream)
150     :output
151     #'(lambda (fd)
152     (declare (ignore fd))
153     (do-output-later stream)))))
154     (t
155     (nconc (fd-stream-output-later stream)
156 wlott 1.4.1.1 (list (list base start end reuse-sap)))))
157     (when reuse-sap
158 ram 1.1 (let ((new-buffer (next-available-buffer)))
159 wlott 1.4.1.1 (setf (fd-stream-obuf-sap stream) new-buffer)
160     (setf (fd-stream-obuf-length stream) bytes-per-buffer))))
161 ram 1.1
162     ;;; DO-OUTPUT -- internal
163     ;;;
164     ;;; Output the given noise. Check to see if there are any pending writes. If
165     ;;; so, just queue this one. Otherwise, try to write it. If this would block,
166     ;;; queue it.
167     ;;;
168 wlott 1.4.1.1 (defun do-output (stream base start end reuse-sap)
169 ram 1.1 (if (not (null (fd-stream-output-later stream))) ; something buffered.
170     (progn
171 wlott 1.4.1.1 (output-later stream base start end reuse-sap)
172     ;; ### check to see if any of this noise can be output
173 ram 1.1 )
174     (let ((length (- end start)))
175     (multiple-value-bind
176     (count errno)
177     (mach:unix-write (fd-stream-fd stream) base start length)
178     (cond ((eql count length)) ; Hot damn, it worked.
179     ((not (null count))
180 wlott 1.4.1.1 (output-later stream base (+ start count) end reuse-sap))
181 ram 1.1 ((= errno mach:ewouldblock)
182 wlott 1.4.1.1 (output-later stream base start end reuse-sap))
183 ram 1.1 (t
184     (error "While writing ~S: ~A"
185     stream
186     (mach:get-unix-error-msg errno))))))))
187    
188     ;;; FLUSH-OUTPUT-BUFFER -- internal
189     ;;;
190     ;;; Flush any data in the output buffer.
191     ;;;
192     (defun flush-output-buffer (stream)
193     (let ((length (fd-stream-obuf-tail stream)))
194     (unless (= length 0)
195 wlott 1.4.1.1 (do-output stream (fd-stream-obuf-sap stream) 0 length t)
196 ram 1.1 (setf (fd-stream-obuf-tail stream) 0))))
197    
198     ;;; DEF-OUTPUT-ROUTINES -- internal
199     ;;;
200     ;;; Define output routines that output numbers size bytes long for the
201     ;;; given bufferings. Use body to do the actual output.
202     ;;;
203     (defmacro def-output-routines ((name size &rest bufferings) &body body)
204     (cons 'progn
205     (mapcar
206     #'(lambda (buffering)
207     (let ((function
208     (intern (let ((*print-case* :upcase))
209     (format nil name (car buffering))))))
210     `(progn
211     (defun ,function (stream byte)
212     ,(unless (eq (car buffering) :none)
213     `(when (< (fd-stream-obuf-length stream)
214     (+ (fd-stream-obuf-tail stream)
215     ,size))
216     (flush-output-buffer stream)))
217     ,@body
218     (incf (fd-stream-obuf-tail stream) ,size)
219     ,(ecase (car buffering)
220     (:none
221     `(flush-output-buffer stream))
222     (:line
223     `(when (eq (char-code byte) (char-code #\Newline))
224     (flush-output-buffer stream)))
225     (:full
226     ))
227     (values))
228     (setf *output-routines*
229     (nconc *output-routines*
230     ',(mapcar
231     #'(lambda (type)
232     (list type
233     (car buffering)
234     function
235     size))
236     (cdr buffering)))))))
237     bufferings)))
238    
239 wlott 1.4.1.1 (def-output-routines ("OUTPUT-CHAR-~A-BUFFERED"
240     1
241     (:none base-character)
242     (:line base-character)
243     (:full base-character))
244     (if (eq (char-code byte)
245     (char-code #\Newline))
246     (setf (fd-stream-char-pos stream) 0)
247     (incf (fd-stream-char-pos stream)))
248     (setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
249     (char-code byte)))
250    
251 ram 1.1 (def-output-routines ("OUTPUT-BYTE-~A-BUFFERED"
252     1
253 wlott 1.4.1.1 (:none (signed-byte 8) (unsigned-byte 8))
254     (:full (signed-byte 8) (unsigned-byte 8)))
255 ram 1.1 (when (characterp byte)
256     (if (eq (char-code byte)
257     (char-code #\Newline))
258     (setf (fd-stream-char-pos stream) 0)
259     (incf (fd-stream-char-pos stream))))
260 wlott 1.4.1.1 (setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
261     byte))
262 ram 1.1
263     (def-output-routines ("OUTPUT-SHORT-~A-BUFFERED"
264     2
265     (:none (signed-byte 16) (unsigned-byte 16))
266     (:full (signed-byte 16) (unsigned-byte 16)))
267 wlott 1.4.1.1 (setf (sap-ref-16 (fd-stream-obuf-sap stream)
268     (truncate (fd-stream-obuf-tail stream) 2))
269     byte))
270    
271     (def-output-routines ("OUTPUT-LONG-~A-BUFFERED"
272 ram 1.1 4
273 wlott 1.4.1.1 (:none (signed-byte 32) (unsigned-byte 32))
274     (:full (signed-byte 32) (unsigned-byte 32)))
275     (setf (sap-ref-32 (fd-stream-obuf-sap stream)
276     (truncate (fd-stream-obuf-tail stream) 4))
277     byte))
278 ram 1.1
279     ;;; OUTPUT-RAW-BYTES -- public
280     ;;;
281     ;;; Does the actual output. If there is space to buffer the string, buffer
282     ;;; it. If the string would normally fit in the buffer, but doesn't because
283     ;;; of other stuff in the buffer, flush the old noise out of the buffer and
284     ;;; put the string in it. Otherwise we have a very long string, so just
285     ;;; send it directly (after flushing the buffer, of course).
286     ;;;
287     (defun output-raw-bytes (stream thing &optional start end)
288     "Output THING to stream. THING can be any kind of vector or a sap. If THING
289     is a SAP, END must be supplied (as length won't work)."
290     (let ((start (or start 0))
291     (end (or end (length thing))))
292     (declare (fixnum start end))
293     (let* ((len (fd-stream-obuf-length stream))
294     (tail (fd-stream-obuf-tail stream))
295     (space (- len tail))
296     (bytes (- end start))
297     (newtail (+ tail bytes)))
298     (cond ((minusp bytes) ; Error case
299     (cerror "Just go on as if nothing happened..."
300     "~S called with :END before :START!"
301     'output-raw-bytes))
302     ((zerop bytes)) ; Easy case
303     ((<= bytes space)
304 wlott 1.4.1.1 (if (system-area-pointer-p thing)
305     (system-area-copy thing
306     (* start vm:byte-bits)
307     (fd-stream-obuf-sap stream)
308     (* tail vm:byte-bits)
309     (* bytes vm:byte-bits))
310     (copy-to-system-area thing
311     (+ (* start vm:byte-bits)
312     (* vm:vector-data-offset vm:word-bits))
313     (fd-stream-obuf-sap stream)
314     (* tail vm:byte-bits)
315     (* bytes vm:byte-bits)))
316 ram 1.1 (setf (fd-stream-obuf-tail stream) newtail))
317     ((<= bytes len)
318     (flush-output-buffer stream)
319 wlott 1.4.1.1 (if (system-area-pointer-p thing)
320     (system-area-copy thing
321     (* start vm:byte-bits)
322     (fd-stream-obuf-sap stream)
323     0
324     (* bytes vm:byte-bits))
325     (copy-to-system-area thing
326     (+ (* start vm:byte-bits)
327     (* vm:vector-data-offset vm:word-bits))
328     (fd-stream-obuf-sap stream)
329     0
330     (* bytes vm:byte-bits)))
331 ram 1.1 (setf (fd-stream-obuf-tail stream) bytes))
332     (t
333     (flush-output-buffer stream)
334     (do-output stream thing start end nil))))))
335    
336     ;;; FD-SOUT -- internal
337     ;;;
338     ;;; Routine to use to output a string. If the stream is unbuffered, slam
339     ;;; the string down the file descriptor, otherwise use OUTPUT-RAW-BYTES to
340     ;;; buffer the string. Update charpos by checking to see where the last newline
341     ;;; was.
342     ;;;
343     ;;; Note: some bozos (the FASL dumper) call write-string with things other
344     ;;; than strings. Therefore, we must make sure we have a string before calling
345     ;;; position on it.
346     ;;;
347     (defun fd-sout (stream thing start end)
348     (let ((start (or start 0))
349     (end (or end (length thing))))
350     (declare (fixnum start end))
351     (if (stringp thing)
352 wlott 1.4.1.1 (let ((last-newline (and (find #\newline (the simple-string thing)
353     :start start :end end)
354     (position #\newline (the simple-string thing)
355     :from-end t
356     :start start
357     :end end))))
358     (ecase (fd-stream-buffering stream)
359     (:full
360     (output-raw-bytes stream thing start end))
361     (:line
362     (output-raw-bytes stream thing start end)
363     (when last-newline
364     (flush-output-buffer stream)))
365     (:none
366     (do-output stream thing start end nil)))
367     (if last-newline
368     (setf (fd-stream-char-pos stream)
369     (- end last-newline 1))
370     (incf (fd-stream-char-pos stream)
371     (- end start))))
372 ram 1.1 (ecase (fd-stream-buffering stream)
373 wlott 1.4.1.1 ((:line :full)
374 ram 1.1 (output-raw-bytes stream thing start end))
375     (:none
376 wlott 1.4.1.1 (do-output stream thing start end nil))))))
377 ram 1.1
378     ;;; PICK-OUTPUT-ROUTINE -- internal
379     ;;;
380     ;;; Find an output routine to use given the type and buffering. Return as
381     ;;; multiple values the routine, the real type transfered, and the number of
382     ;;; bytes per element.
383     ;;;
384     (defun pick-output-routine (type buffering)
385     (dolist (entry *output-routines*)
386     (when (and (subtypep type (car entry))
387     (eq buffering (cadr entry)))
388     (return (values (symbol-function (caddr entry))
389     (car entry)
390     (cadddr entry))))))
391    
392    
393     ;;;; Input routines and related noise.
394    
395     (defvar *input-routines* ()
396     "List of all available input routines. Each element is a list of the
397     element-type input, the function name, and the number of bytes per element.")
398    
399     ;;; DO-INPUT -- internal
400     ;;;
401     ;;; Fills the input buffer, and returns the first character. Throws to
402     ;;; eof-input-catcher if the eof was reached. Drops into system:server if
403     ;;; necessary.
404     ;;;
405     (defun do-input (stream)
406     (let ((fd (fd-stream-fd stream))
407     (ibuf-sap (fd-stream-ibuf-sap stream))
408     (buflen (fd-stream-ibuf-length stream))
409     (head (fd-stream-ibuf-head stream))
410     (tail (fd-stream-ibuf-tail stream)))
411     (unless (zerop head)
412     (cond ((eq head tail)
413     (setf head 0)
414     (setf tail 0)
415     (setf (fd-stream-ibuf-head stream) 0)
416     (setf (fd-stream-ibuf-tail stream) 0))
417     (t
418     (decf tail head)
419 wlott 1.4.1.1 (system-area-copy ibuf-sap (* head vm:byte-bits)
420     ibuf-sap 0 (* tail vm:byte-bits))
421 ram 1.1 (setf head 0)
422     (setf (fd-stream-ibuf-head stream) 0)
423     (setf (fd-stream-ibuf-tail stream) tail))))
424     (setf (fd-stream-listen stream) nil)
425 wlott 1.4.1.1 #+serve-event
426 ram 1.1 (multiple-value-bind
427     (count errno)
428     (mach:unix-select (1+ fd) (ash 1 fd) 0 0 0)
429     (case count
430     (1)
431     (0
432     (system:wait-until-fd-usable fd :input))
433     (t
434     (error "Problem checking to see if ~S is readable: ~A"
435     stream
436     (mach:get-unix-error-msg errno)))))
437     (multiple-value-bind
438     (count errno)
439     (mach:unix-read fd
440     (system:int-sap (+ (system:sap-int ibuf-sap) tail))
441     (- buflen tail))
442     (cond ((null count)
443 wlott 1.4.1.1 (if #+serve-event (eql errno mach:ewouldblock)
444     #-serve-event nil
445 ram 1.1 (progn
446     (system:wait-until-fd-usable fd :input)
447     (do-input stream))
448     (error "Error reading ~S: ~A"
449     stream
450     (mach:get-unix-error-msg errno))))
451     ((zerop count)
452     (throw 'eof-input-catcher nil))
453     (t
454     (incf (fd-stream-ibuf-tail stream) count))))))
455    
456     ;;; INPUT-AT-LEAST -- internal
457     ;;;
458     ;;; Makes sure there are at least ``bytes'' number of bytes in the input
459     ;;; buffer. Keeps calling do-input until that condition is met.
460     ;;;
461     (defmacro input-at-least (stream bytes)
462     (let ((stream-var (gensym))
463     (bytes-var (gensym)))
464     `(let ((,stream-var ,stream)
465     (,bytes-var ,bytes))
466     (loop
467     (when (>= (- (fd-stream-ibuf-tail ,stream-var)
468     (fd-stream-ibuf-head ,stream-var))
469     ,bytes-var)
470     (return))
471     (do-input ,stream-var)))))
472    
473     ;;; INPUT-WRAPPER -- intenal
474     ;;;
475     ;;; Macro to wrap around all input routines to handle eof-error noise. This
476     ;;; should make provisions for filling stream-in-buffer.
477     ;;;
478     (defmacro input-wrapper ((stream bytes eof-error eof-value) &body read-forms)
479     (let ((stream-var (gensym))
480     (element-var (gensym)))
481     `(let ((,stream-var ,stream))
482     (if (fd-stream-unread ,stream)
483     (prog1
484     (fd-stream-unread ,stream)
485     (setf (fd-stream-unread ,stream) nil))
486     (let ((,element-var
487     (catch 'eof-input-catcher
488     (input-at-least ,stream-var ,bytes)
489     ,@read-forms)))
490     (cond (,element-var
491     (incf (fd-stream-ibuf-head ,stream-var) ,bytes)
492     ,element-var)
493     (,eof-error
494     (error "EOF while reading ~S" stream))
495     (t
496     ,eof-value)))))))
497    
498     ;;; DEF-INPUT-ROUTINE -- internal
499     ;;;
500     ;;; Defines an input routine.
501     ;;;
502     (defmacro def-input-routine (name
503     (type size sap head)
504     &rest body)
505     `(progn
506     (defun ,name (stream eof-error eof-value)
507     (input-wrapper (stream ,size eof-error eof-value)
508     (let ((,sap (fd-stream-ibuf-sap stream))
509     (,head (fd-stream-ibuf-head stream)))
510     ,@body)))
511     (setf *input-routines*
512     (nconc *input-routines*
513     (list (list ',type ',name ',size))))))
514    
515 wlott 1.4.1.1 ;;; INPUT-BASE-CHARACTER -- internal
516 ram 1.1 ;;;
517     ;;; Routine to use in stream-in slot for reading string chars.
518     ;;;
519 wlott 1.4.1.1 (def-input-routine input-base-character
520     (base-character 1 sap head)
521     (code-char (sap-ref-8 sap head)))
522 ram 1.1
523     ;;; INPUT-UNSIGNED-8BIT-BYTE -- internal
524     ;;;
525     ;;; Routine to read in an unsigned 8 bit number.
526     ;;;
527     (def-input-routine input-unsigned-8bit-byte
528     ((unsigned-byte 8) 1 sap head)
529 wlott 1.4.1.1 (sap-ref-8 sap head))
530 ram 1.1
531     ;;; INPUT-SIGNED-8BIT-BYTE -- internal
532     ;;;
533     ;;; Routine to read in a signed 8 bit number.
534     ;;;
535     (def-input-routine input-signed-8bit-number
536     ((signed-byte 8) 1 sap head)
537 wlott 1.4.1.1 (signed-sap-ref-8 sap head))
538 ram 1.1
539     ;;; INPUT-UNSIGNED-16BIT-BYTE -- internal
540     ;;;
541     ;;; Routine to read in an unsigned 16 bit number.
542     ;;;
543     (def-input-routine input-unsigned-16bit-byte
544     ((unsigned-byte 16) 2 sap head)
545 wlott 1.4.1.1 (sap-ref-16 sap (truncate head 2)))
546 ram 1.1
547     ;;; INPUT-SIGNED-16BIT-BYTE -- internal
548     ;;;
549     ;;; Routine to read in a signed 16 bit number.
550     ;;;
551     (def-input-routine input-signed-16bit-byte
552     ((signed-byte 16) 2 sap head)
553 wlott 1.4.1.1 (signed-sap-ref-16 sap (truncate head 2)))
554 ram 1.1
555     ;;; INPUT-UNSIGNED-32BIT-BYTE -- internal
556     ;;;
557     ;;; Routine to read in a unsigned 32 bit number.
558     ;;;
559     (def-input-routine input-unsigned-32bit-byte
560     ((unsigned-byte 32) 4 sap head)
561 wlott 1.4.1.1 (sap-ref-32 sap (truncate head 4)))
562 ram 1.1
563     ;;; INPUT-SIGNED-32BIT-BYTE -- internal
564     ;;;
565     ;;; Routine to read in a signed 32 bit number.
566     ;;;
567     (def-input-routine input-signed-32bit-byte
568     ((signed-byte 32) 4 sap head)
569 wlott 1.4.1.1 (signed-sap-ref-32 sap (truncate head 2)))
570 ram 1.1
571     ;;; PICK-INPUT-ROUTINE -- internal
572     ;;;
573     ;;; Find an input routine to use given the type. Return as multiple values
574     ;;; the routine, the real type transfered, and the number of bytes per element.
575     ;;;
576     (defun pick-input-routine (type)
577     (dolist (entry *input-routines*)
578     (when (subtypep type (car entry))
579     (return (values (symbol-function (cadr entry))
580     (car entry)
581     (caddr entry))))))
582    
583     ;;; STRING-FROM-SAP -- internal
584     ;;;
585     ;;; Returns a string constructed from the sap, start, and end.
586     ;;;
587     (defun string-from-sap (sap start end)
588     (let* ((length (- end start))
589     (string (make-string length)))
590 wlott 1.4.1.2 (copy-from-system-area sap (* start vm:byte-bits)
591     string (* vm:vector-data-offset vm:word-bits)
592     (* length vm:byte-bits))
593 ram 1.1 string))
594    
595     ;;; FD-STREAM-READ-LINE -- internal
596     ;;;
597     ;;; Reads a line, returning a simple string. Note: this relies on the fact
598     ;;; that the input buffer does not change during do-input.
599     ;;;
600     (defun fd-stream-read-line (stream eof-error-p eof-value)
601     (let ((eof t))
602     (values
603     (or (let ((sap (fd-stream-ibuf-sap stream))
604     (results (if (fd-stream-unread stream)
605 ram 1.3 (prog1
606     (list (string (fd-stream-unread stream)))
607     (setf (fd-stream-unread stream) nil)))))
608 ram 1.1 (catch 'eof-input-catcher
609     (loop
610     (input-at-least stream 1)
611     (let* ((head (fd-stream-ibuf-head stream))
612     (tail (fd-stream-ibuf-tail stream))
613 wlott 1.4.1.1 (newline (do ((index head (1+ index)))
614     ((= index tail) nil)
615     (when (= (sap-ref-8 sap index)
616     (char-code #\newline))
617     (return index))))
618 ram 1.1 (end (or newline tail)))
619     (push (string-from-sap sap head end)
620     results)
621     (when newline
622     (setf eof nil)
623     (setf (fd-stream-ibuf-head stream)
624     (1+ newline))
625     (return))
626     (setf (fd-stream-ibuf-head stream) end))))
627     (cond ((null results)
628     nil)
629     ((null (cdr results))
630     (car results))
631     (t
632     (apply #'concatenate 'simple-string (nreverse results)))))
633     (if eof-error-p
634 ram 1.3 (error "EOF while reading ~S" stream)
635     eof-value))
636 ram 1.1 eof)))
637    
638    
639     ;;; FD-STREAM-READ-N-BYTES -- internal
640     ;;;
641     ;;; The n-bin routine.
642     ;;;
643     (defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p)
644     (let* ((sap (fd-stream-ibuf-sap stream))
645     (elsize (fd-stream-element-size stream))
646     (offset (* elsize start))
647     (bytes (* elsize requested))
648 wlott 1.4.1.1 (result
649     (catch 'eof-input-catcher
650     (loop
651     (input-at-least stream 1)
652     (let* ((head (fd-stream-ibuf-head stream))
653     (tail (fd-stream-ibuf-tail stream))
654     (available (- tail head))
655     (copy (min available bytes)))
656     (system-area-copy buffer (* offset vm:byte-bits)
657     sap (* head vm:byte-bits)
658     (* copy vm:byte-bits))
659     (incf (fd-stream-ibuf-head stream) copy)
660     (incf offset copy)
661     (decf bytes copy))
662     (when (zerop bytes)
663     (return requested))))))
664 ram 1.1 (cond (result)
665     ((not eof-error-p)
666     (- requested (/ bytes elsize)))
667     (t
668     (error "Hit eof on ~S after reading ~D ~D~2:*-bit byte~P~*, ~
669     but ~D~2:* ~D-bit byte~P~:* ~[were~;was~:;were~] requested."
670     stream
671     (- requested (/ bytes elsize))
672     (* elsize 8)
673     requested)))))
674    
675    
676     ;;;; Utility functions (misc routines, etc)
677    
678     ;;; SET-ROUTINES -- internal
679     ;;;
680     ;;; Fill in the various routine slots for the given type. Input-p and output-p
681     ;;; indicate what slots to fill. The buffering slot must be set prior to
682     ;;; calling this routine.
683     ;;;
684     (defun set-routines (stream type input-p output-p)
685     (let ((target-type (case type
686     ((:default unsigned-byte)
687     '(unsigned-byte 8))
688     (signed-byte
689     '(signed-byte 8))
690     (t
691     type)))
692     (input-type nil)
693     (output-type nil)
694     (input-size nil)
695     (output-size nil))
696    
697 wlott 1.4.1.1 (when (fd-stream-obuf-sap stream)
698     (push (fd-stream-obuf-sap stream) *available-buffers*)
699     (setf (fd-stream-obuf-sap stream) nil))
700     (when (fd-stream-ibuf-sap stream)
701     (push (fd-stream-ibuf-sap stream) *available-buffers*)
702     (setf (fd-stream-ibuf-sap stream) nil))
703 ram 1.1
704     (when input-p
705     (multiple-value-bind
706     (routine type size)
707     (pick-input-routine target-type)
708     (unless routine
709     (error "Could not find any input routine for ~S" target-type))
710 wlott 1.4.1.1 (setf (fd-stream-ibuf-sap stream) (next-available-buffer))
711     (setf (fd-stream-ibuf-length stream) bytes-per-buffer)
712     (setf (fd-stream-ibuf-tail stream) 0)
713 ram 1.1 (if (subtypep type 'character)
714     (setf (fd-stream-in stream) routine
715     (fd-stream-bin stream) #'ill-bin
716     (fd-stream-n-bin stream) #'ill-bin)
717     (setf (fd-stream-in stream) #'ill-in
718     (fd-stream-bin stream) routine
719     (fd-stream-n-bin stream) #'fd-stream-read-n-bytes))
720     (setf input-size size)
721     (setf input-type type)))
722    
723     (when output-p
724     (multiple-value-bind
725     (routine type size)
726     (pick-output-routine target-type (fd-stream-buffering stream))
727     (unless routine
728     (error "Could not find any output routine for ~S buffered ~S."
729     (fd-stream-buffering stream)
730     target-type))
731 wlott 1.4.1.1 (setf (fd-stream-obuf-sap stream) (next-available-buffer))
732     (setf (fd-stream-obuf-length stream) bytes-per-buffer)
733 ram 1.1 (setf (fd-stream-obuf-tail stream) 0)
734     (if (subtypep type 'character)
735     (setf (fd-stream-out stream) routine
736     (fd-stream-bout stream) #'ill-bout)
737     (setf (fd-stream-out stream)
738     (or (if (eql size 1)
739 wlott 1.4.1.1 (pick-output-routine 'base-character
740 ram 1.1 (fd-stream-buffering stream)))
741     #'ill-out)
742     (fd-stream-bout stream) routine))
743     (setf (fd-stream-sout stream)
744     (if (eql size 1) #'fd-sout #'ill-out))
745     (setf (fd-stream-char-pos stream) 0)
746     (setf output-size size)
747     (setf output-type type)))
748    
749     (when (and input-size output-size
750     (not (eq input-size output-size)))
751     (error "Element sizes for input (~S:~S) and output (~S:~S) differ?"
752     input-type input-size
753     output-type output-size))
754     (setf (fd-stream-element-size stream)
755     (or input-size output-size))
756    
757     (setf (fd-stream-element-type stream)
758     (cond ((equal input-type output-type)
759     input-type)
760     ((subtypep input-type output-type)
761     input-type)
762     ((subtypep output-type input-type)
763     output-type)
764     (t
765     (error "Input type (~S) and output type (~S) are unrelated?"
766     input-type
767     output-type))))))
768    
769     ;;; FD-STREAM-MISC-ROUTINE -- input
770     ;;;
771     ;;; Handle the various misc operations on fd-stream.
772     ;;;
773     (defun fd-stream-misc-routine (stream operation &optional arg1 arg2)
774     (case operation
775     (:read-line
776     (fd-stream-read-line stream arg1 arg2))
777     (:listen
778     (or (not (eql (fd-stream-ibuf-head stream)
779     (fd-stream-ibuf-tail stream)))
780     (fd-stream-listen stream)
781     (setf (fd-stream-listen stream)
782     (not (zerop (mach:unix-select (1+ (fd-stream-fd stream))
783     (ash 1 (fd-stream-fd stream))
784     0
785     0
786     0))))))
787     (:unread
788     (setf (fd-stream-unread stream) arg1))
789     (:close
790     (cond (arg1
791     ;; We got us an abort on our hands.
792     (when (and (fd-stream-file stream)
793 wlott 1.4.1.1 (fd-stream-obuf-sap stream))
794 ram 1.1 ;; Can't do anything unless we know what file were dealing with,
795     ;; and we don't want to do anything strange unless we were
796     ;; writing to the file.
797     (if (fd-stream-original stream)
798     ;; Have an handle on the original, just revert.
799     (multiple-value-bind
800     (okay err)
801     (mach:unix-rename (fd-stream-original stream)
802     (fd-stream-file stream))
803     (unless okay
804     (cerror "Go on as if nothing bad happened."
805     "Could not restore ~S to it's original contents: ~A"
806     (fd-stream-file stream)
807     (mach:get-unix-error-msg err))))
808     ;; Can't restore the orignal, so nuke that puppy.
809     (multiple-value-bind
810     (okay err)
811     (mach:unix-unlink (fd-stream-file stream))
812     (unless okay
813     (cerror "Go on as if nothing bad happened."
814     "Could not remove ~S: ~A"
815     (fd-stream-file stream)
816     (mach:get-unix-error-msg err)))))))
817     (t
818     (fd-stream-misc-routine stream :finish-output)
819     (when (and (fd-stream-original stream)
820     (fd-stream-delete-original stream))
821     (multiple-value-bind
822     (okay err)
823     (mach:unix-unlink (fd-stream-original stream))
824     (unless okay
825     (cerror "Go on as if nothing bad happened."
826     "Could not delete ~S during close of ~S: ~A"
827     (fd-stream-original stream)
828     stream
829     (mach:get-unix-error-msg err)))))))
830     (mach:unix-close (fd-stream-fd stream))
831 wlott 1.4.1.1 (when (fd-stream-obuf-sap stream)
832     (push (fd-stream-obuf-sap stream) *available-buffers*)
833     (setf (fd-stream-obuf-sap stream) nil))
834     (when (fd-stream-ibuf-sap stream)
835     (push (fd-stream-ibuf-sap stream) *available-buffers*)
836     (setf (fd-stream-ibuf-sap stream) nil))
837 ram 1.1 (lisp::set-closed-flame stream))
838     (:clear-input)
839     (:force-output
840     (flush-output-buffer stream))
841     (:finish-output
842     (flush-output-buffer stream)
843 wlott 1.4.1.1 #+serve-event
844 ram 1.1 (do ()
845     ((null (fd-stream-output-later stream)))
846     (system:serve-all-events)))
847     (:element-type
848     (fd-stream-element-type stream))
849     (:line-length
850     80)
851     (:charpos
852     (fd-stream-char-pos stream))
853     (:file-length
854     (multiple-value-bind
855     (okay dev ino mode nlink uid gid rdev size
856     atime mtime ctime blksize blocks)
857     (mach:unix-fstat (fd-stream-fd stream))
858     (declare (ignore ino nlink uid gid rdev
859     atime mtime ctime blksize blocks))
860     (unless okay
861     (error "Error fstating ~S: ~A"
862     stream
863     (mach:get-unix-error-msg dev)))
864     (if (zerop mode)
865     nil
866     (/ size (fd-stream-element-size stream)))))
867     (:file-position
868     (fd-stream-file-position stream arg1))
869     (:file-name
870     (fd-stream-file stream))))
871    
872     ;;; FD-STREAM-FILE-POSITION -- internal.
873     ;;;
874     (defun fd-stream-file-position (stream &optional newpos)
875     (if (null newpos)
876     (system:without-interrupts
877     ;; First, find the position of the UNIX file descriptor in the
878     ;; file.
879     (multiple-value-bind
880     (posn errno)
881     (mach:unix-lseek (fd-stream-fd stream) 0 mach:l_incr)
882     (cond ((numberp posn)
883     ;; Adjust for buffered output:
884     ;; If there is any output buffered, the *real* file position
885     ;; will be larger than reported by lseek because lseek
886     ;; obviously cannot take into account output we have not
887     ;; sent yet.
888     (dolist (later (fd-stream-output-later stream))
889     (incf posn (- (caddr later) (cadr later))))
890     (incf posn (fd-stream-obuf-tail stream))
891     ;; Adjust for unread input:
892     ;; If there is any input read from UNIX but not supplied to
893     ;; the user of the stream, the *real* file position will
894     ;; smaller than reported, because we want to look like the
895     ;; unread stuff is still available.
896     (decf posn (- (fd-stream-ibuf-tail stream)
897     (fd-stream-ibuf-head stream)))
898     (when (fd-stream-unread stream)
899     (decf posn))
900     ;; Divide bytes by element size.
901     (/ posn (fd-stream-element-size stream)))
902     ((eq errno mach:espipe)
903     nil)
904     (t
905     (system:with-interrupts
906     (error "Error lseek'ing ~S: ~A"
907     stream
908     (mach:get-unix-error-msg errno)))))))
909     (let (offset origin)
910     ;; Make sure we don't have any output pending, because if we move the
911     ;; file pointer before writing this stuff, it will be written in the
912     ;; wrong location.
913     (flush-output-buffer stream)
914     (do ()
915     ((null (fd-stream-output-later stream)))
916     (system:serve-all-events))
917     (cond ((eq newpos :start)
918     (setf offset 0 origin mach:l_set))
919     ((eq newpos :end)
920     (setf offset 0 origin mach:l_xtnd))
921     ((numberp newpos)
922     (setf offset (* newpos (fd-stream-element-size stream))
923     origin mach:l_set))
924     (t
925     (error "Invalid position given to file-position: ~S" newpos)))
926     (multiple-value-bind
927     (posn errno)
928     (mach:unix-lseek (fd-stream-fd stream) offset origin)
929     (cond ((numberp posn)
930     t)
931     ((eq errno mach:espipe)
932     nil)
933     (t
934     (error "Error lseek'ing ~S: ~A"
935     stream
936     (mach:get-unix-error-msg errno))))))))
937    
938    
939    
940     ;;;; Creation routines (MAKE-FD-STREAM and OPEN)
941    
942     ;;; MAKE-FD-STREAM -- Public.
943     ;;;
944     ;;; Returns a FD-STREAM on the given file.
945     ;;;
946     (defun make-fd-stream (fd
947     &key
948     (input nil input-p)
949     (output nil output-p)
950 wlott 1.4.1.1 (element-type 'base-character)
951 ram 1.1 (buffering :full)
952     file
953     original
954     delete-original
955     (name (if file
956     (format nil "file ~S" file)
957     (format nil "descriptor ~D" fd))))
958     "Create a stream for the given unix file descriptor. If input is non-nil,
959     allow input operations. If output is non-nil, allow output operations. If
960     neither input nor output are specified, default to allowing input.
961     element-type indicates the element type to use (as for open). Buffering
962     indicates the kind of buffering to use (one of :none, :line, or :full). If
963     file is spesified, it should be the name of the file. Name is used to
964     identify the stream when printed."
965     (cond ((not (or input-p output-p))
966     (setf input t))
967     ((not (or input output))
968     (error "File descriptor must be opened either for input or output.")))
969     (let ((stream (%make-fd-stream :fd fd
970     :name name
971     :file file
972     :original original
973     :delete-original delete-original
974     :buffering buffering)))
975     (set-routines stream element-type input output)
976     stream))
977    
978     ;;; PICK-PACKUP-NAME -- internal
979     ;;;
980     ;;; Pick a name to use for the backup file.
981     ;;;
982     (defvar *backup-extension* ".BAK"
983     "This is a string that OPEN tacks on the end of a file namestring to produce
984     a name for the :if-exists :rename-and-delete and :rename options. Also,
985     this can be a function that takes a namestring and returns a complete
986     namestring.")
987     ;;;
988     (defun pick-backup-name (name)
989     (etypecase *backup-extension*
990     (string (concatenate 'simple-string name *backup-extension*))
991     (function (funcall *backup-extension* name))))
992    
993     ;;; ASSURE-ONE-OF -- internal
994     ;;;
995     ;;; Assure that the given arg is one of the given list of valid things.
996     ;;; Allow the user to fix any problems.
997     ;;;
998     (defun assure-one-of (item list what)
999     (unless (member item list)
1000     (loop
1001     (cerror "Enter new value for ~*~S"
1002     "~S is invalid for ~S. Must be one of~{ ~S~}"
1003     item
1004     what
1005     list)
1006     (format *query-io* "Enter new value for ~S: " what)
1007     (force-output *query-io*)
1008     (setf item (read *query-io*))
1009     (when (member item list)
1010     (return))))
1011     item)
1012    
1013     ;;; OPEN -- public
1014     ;;;
1015     ;;; Open the given file.
1016     ;;;
1017     (defun open (filename
1018     &key
1019     (direction :input)
1020 wlott 1.4.1.1 (element-type 'base-character)
1021 ram 1.1 (if-exists nil if-exists-given)
1022     (if-does-not-exist nil if-does-not-exist-given))
1023     "Return a stream which reads from or writes to Filename.
1024     Defined keywords:
1025     :direction - one of :input, :output, :io, or :probe
1026 wlott 1.4.1.1 :element-type - Type of object to read or write, default BASE-CHARACTER
1027 ram 1.1 :if-exists - one of :error, :new-version, :rename, :rename-and-delete,
1028     :overwrite, :append, :supersede or nil
1029     :if-does-not-exist - one of :error, :create or nil
1030     See the manual for details."
1031     ;; First, make sure that DIRECTION is valid. Allow it to be changed if not.
1032     (setf direction
1033     (assure-one-of direction
1034     '(:input :output :io :probe)
1035     :direction))
1036    
1037     ;; Calculate useful stuff.
1038     (multiple-value-bind
1039     (input output mask)
1040     (case direction
1041     (:input (values t nil mach:o_rdonly))
1042     (:output (values nil t mach:o_wronly))
1043     (:io (values t t mach:o_rdwr))
1044     (:probe (values nil nil mach:o_rdonly)))
1045     (let* ((pathname (pathname filename))
1046     (namestring (predict-name pathname input)))
1047    
1048     ;; Process if-exists argument if we are doing any output.
1049     (cond (output
1050     (unless if-exists-given
1051     (setf if-exists
1052     (if (eq (pathname-version pathname) :newest)
1053     :new-version
1054     :error)))
1055     (setf if-exists
1056     (assure-one-of if-exists
1057     '(:error :new-version :rename
1058     :rename-and-delete :overwrite
1059     :append :supersede nil)
1060     :if-exists))
1061     (case if-exists
1062     ((:error nil)
1063     (setf mask (logior mask mach:o_excl)))
1064     ((:rename :rename-and-delete)
1065     (setf mask (logior mask mach:o_creat)))
1066     ((:new-version :supersede)
1067     (setf mask (logior mask mach:o_trunc)))
1068     (:append
1069     (setf mask (logior mask mach:o_append)))))
1070     (t
1071     (setf if-exists :ignore-this-arg)))
1072    
1073     (unless if-does-not-exist-given
1074     (setf if-does-not-exist
1075     (cond ((eq direction :input) :error)
1076     ((and output
1077     (member if-exists '(:overwrite :append)))
1078     :error)
1079     ((eq direction :probe)
1080     nil)
1081     (t
1082     :create))))
1083     (setf if-does-not-exist
1084     (assure-one-of if-does-not-exist
1085     '(:error :create nil)
1086     :if-does-not-exist))
1087     (if (eq if-does-not-exist :create)
1088     (setf mask (logior mask mach:o_creat)))
1089    
1090     (let ((original (if (member if-exists
1091     '(:rename :rename-and-delete))
1092     (pick-backup-name namestring)))
1093     (delete-original (eq if-exists :rename-and-delete))
1094     (mode #o666))
1095     (when original
1096     ;; We are doing a :rename or :rename-and-delete.
1097     ;; Determine if the file already exists, make sure the original
1098     ;; file is not a directory and keep the mode
1099     (let ((exists
1100     (multiple-value-bind
1101     (okay err/dev inode orig-mode)
1102     (mach:unix-stat namestring)
1103     (declare (ignore inode))
1104     (cond (okay
1105     (when (and output (= (logand orig-mode #o170000)
1106     #o40000))
1107     (error "Cannot open ~S for output: Is a directory."
1108     namestring))
1109     (setf mode (logand orig-mode #o777))
1110     t)
1111     ((eql err/dev mach:enoent)
1112     nil)
1113     (t
1114     (error "Cannot find ~S: ~A"
1115     namestring
1116     (mach:get-unix-error-msg err/dev)))))))
1117     (when (or (not exists)
1118     ;; Do the rename.
1119     (multiple-value-bind
1120     (okay err)
1121     (mach:unix-rename namestring original)
1122     (unless okay
1123     (cerror "Use :SUPERSEDE instead."
1124     "Could not rename ~S to ~S: ~A."
1125     namestring
1126     original
1127     (mach:get-unix-error-msg err))
1128     t)))
1129     (setf original nil)
1130     (setf delete-original nil)
1131     ;; In order to use SUPERSEDE instead, we have
1132     ;; to make sure mach:o_creat corresponds to
1133     ;; if-does-not-exist. mach:o_creat was set
1134     ;; before because of if-exists being :rename.
1135     (unless (eq if-does-not-exist :create)
1136     (setf mask (logior (logandc2 mask mach:o_creat) mach:o_trunc)))
1137     (setf if-exists :supersede))))
1138    
1139     ;; Okay, now we can try the actual open.
1140     (multiple-value-bind
1141     (fd errno)
1142     (mach:unix-open namestring mask mode)
1143     (cond ((numberp fd)
1144     (case direction
1145     ((:input :output :io)
1146     (make-fd-stream fd
1147     :input input
1148     :output output
1149     :element-type element-type
1150     :file namestring
1151     :original original
1152     :delete-original delete-original))
1153     (:probe
1154     (let ((stream (%make-fd-stream :name namestring
1155     :fd fd
1156     :element-type element-type)))
1157     (close stream)
1158     stream))))
1159     ((eql errno mach:enoent)
1160     (case if-does-not-exist
1161     (:error
1162     (cerror "Return NIL."
1163     "Error opening ~S, ~A."
1164     pathname
1165     (mach:get-unix-error-msg errno)))
1166     (:create
1167     (cerror "Return NIL."
1168     "Error creating ~S, path does not exist."
1169     pathname)))
1170     nil)
1171     ((eql errno mach:eexist)
1172     (unless (eq nil if-exists)
1173     (cerror "Return NIL."
1174     "Error opening ~S, ~A."
1175     pathname
1176     (mach:get-unix-error-msg errno)))
1177     nil)
1178     (t
1179     (cerror "Return NIL."
1180     "Error opening ~S, ~A."
1181     pathname
1182     (mach:get-unix-error-msg errno))
1183     nil)))))))
1184    
1185     ;;;; Initialization.
1186    
1187     (defvar *tty* nil
1188     "The stream connected to the controlling terminal or NIL if there is none.")
1189     (defvar *stdin* nil
1190     "The stream connected to the standard input (file descriptor 0).")
1191     (defvar *stdout* nil
1192     "The stream connected to the standard output (file descriptor 1).")
1193     (defvar *stderr* nil
1194     "The stream connected to the standard error output (file descriptor 2).")
1195    
1196     ;;; STREAM-INIT -- internal interface
1197     ;;;
1198     ;;; Called when the cold load is first started up.
1199     ;;;
1200     (defun stream-init ()
1201     (stream-reinit)
1202     (setf *terminal-io* (make-synonym-stream '*tty*))
1203     (setf *standard-input* (make-synonym-stream '*stdin*))
1204     (setf *standard-output* (make-synonym-stream '*stdout*))
1205     (setf *error-output* (make-synonym-stream '*stderr*))
1206     (setf *query-io* (make-synonym-stream '*terminal-io*))
1207     (setf *debug-io* *query-io*)
1208     (setf *trace-output* *standard-output*)
1209     nil)
1210    
1211     ;;; STREAM-REINIT -- internal interface
1212     ;;;
1213     ;;; Called whenever a saved core is restarted.
1214     ;;;
1215     (defun stream-reinit ()
1216     (setf *available-buffers* nil)
1217     (setf *stdin*
1218     (make-fd-stream 0 :name "Standard Input" :input t :buffering :line))
1219     (setf *stdout*
1220     (make-fd-stream 1 :name "Standard Output" :output t :buffering :line))
1221     (setf *stderr*
1222     (make-fd-stream 2 :name "Standard Error" :output t :buffering :line))
1223     (let ((tty (mach:unix-open "/dev/tty" mach:o_rdwr #o666)))
1224     (if tty
1225     (setf *tty*
1226     (make-fd-stream tty :name "the Terminal" :input t :output t
1227     :buffering :line))
1228     (setf *tty* (make-two-way-stream *stdin* *stdout*))))
1229     nil)
1230    
1231    
1232     ;;;; Beeping.
1233    
1234     (defun default-beep-function (stream)
1235     (write-char #\bell stream)
1236     (finish-output stream))
1237    
1238     (defvar *beep-function* #'default-beep-function
1239     "This is called in BEEP to feep the user. It takes a stream.")
1240    
1241     (defun beep (&optional (stream *terminal-io*))
1242     (funcall *beep-function* stream))
1243    
1244    
1245     ;;;; File position and file length.
1246    
1247     ;;; File-Position -- Public
1248     ;;;
1249     ;;; Call the misc method with the :file-position operation.
1250     ;;;
1251     (defun file-position (stream &optional position)
1252     "With one argument returns the current position within the file
1253     File-Stream is open to. If the second argument is supplied, then
1254     this becomes the new file position. The second argument may also
1255     be :start or :end for the start and end of the file, respectively."
1256     (unless (streamp stream)
1257     (error "Argument ~S is not a stream." stream))
1258     (funcall (stream-misc stream) stream :file-position position))
1259    
1260     ;;; File-Length -- Public
1261     ;;;
1262     ;;; Like File-Position, only use :file-length.
1263     ;;;
1264     (defun file-length (stream)
1265     "This function returns the length of the file that File-Stream is open to."
1266     (unless (streamp stream)
1267     (error "Argument ~S is not a stream." stream))
1268     (funcall (stream-misc stream) stream :file-length))
1269    
1270     ;;; File-Name -- internal interface
1271     ;;;
1272     ;;; Kind of like File-Position, but is an internal hack used by the filesys
1273     ;;; stuff to get and set the file name.
1274     ;;;
1275     (defun file-name (stream &optional new-name)
1276     (when (fd-stream-p stream)
1277     (if new-name
1278     (setf (fd-stream-file stream) new-name)
1279     (fd-stream-file stream))))

  ViewVC Help
Powered by ViewVC 1.1.5