1 ;;;; streams for UNIX file descriptors
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
12 (in-package "SB!IMPL")
16 ;;;; Streams hold BUFFER objects, which contain a SAP, size of the
17 ;;;; memory area the SAP stands for (LENGTH bytes), and HEAD and TAIL
18 ;;;; indexes which delimit the "valid", or "active" area of the
19 ;;;; memory. HEAD is inclusive, TAIL is exclusive.
21 ;;;; Buffers get allocated lazily, and are recycled by returning them
22 ;;;; to the *AVAILABLE-BUFFERS* list. Every buffer has it's own
23 ;;;; finalizer, to take care of releasing the SAP memory when a stream
24 ;;;; is not properly closed.
26 ;;;; The code aims to provide a limited form of thread and interrupt
27 ;;;; safety: parallel writes and reads may lose output or input, cause
28 ;;;; interleaved IO, etc -- but they should not corrupt memory. The
29 ;;;; key to doing this is to read buffer state once, and update the
30 ;;;; state based on the read state:
32 ;;;; (let ((tail (buffer-tail buffer)))
34 ;;;; (setf (buffer-tail buffer) (+ tail n)))
38 ;;;; (let ((tail (buffer-tail buffer)))
40 ;;;; (incf (buffer-tail buffer) n))
43 (declaim (inline buffer-sap buffer-length buffer-head buffer-tail
44 (setf buffer-head) (setf buffer-tail)))
45 (defstruct (buffer (:constructor %make-buffer (sap length)))
46 (sap (missing-arg) :type system-area-pointer :read-only t)
47 (length (missing-arg) :type index :read-only t)
51 (defvar *available-buffers* ()
53 "List of available buffers.")
55 (defvar *available-buffers-spinlock* (sb!thread::make-spinlock
56 :name "lock for *AVAILABLE-BUFFERS*")
58 "Mutex for access to *AVAILABLE-BUFFERS*.")
60 (defmacro with-available-buffers-lock ((&optional) &body body)
61 ;; CALL-WITH-SYSTEM-SPINLOCK because
63 ;; 1. streams are low-level enough to be async signal safe, and in
64 ;; particular a C-c that brings up the debugger while holding the
65 ;; mutex would lose badly
67 ;; 2. this can potentially be a fairly busy (but also probably
68 ;; uncontended) lock, so we don't want to pay the syscall per
69 ;; release -- hence a spinlock.
71 ;; ...again, once we have smarted locks the spinlock here can become
73 `(sb!thread::call-with-system-spinlock (lambda () ,@body)
74 *available-buffers-spinlock*))
76 (defconstant +bytes-per-buffer+ (* 4 1024)
78 "Default number of bytes per buffer.")
80 (defun alloc-buffer (&optional (size +bytes-per-buffer+))
81 ;; Don't want to allocate & unwind before the finalizer is in place.
83 (let* ((sap (allocate-system-memory size))
84 (buffer (%make-buffer sap size)))
85 (when (zerop (sap-int sap))
86 (error "Could not allocate ~D bytes for buffer." size))
87 (finalize buffer (lambda ()
88 (deallocate-system-memory sap size))
93 ;; Don't go for the lock if there is nothing to be had -- sure,
94 ;; another thread might just release one before we get it, but that
95 ;; is not worth the cost of locking. Also release the lock before
96 ;; allocation, since it's going to take a while.
97 (if *available-buffers*
98 (or (with-available-buffers-lock ()
99 (pop *available-buffers*))
103 (declaim (inline reset-buffer))
104 (defun reset-buffer (buffer)
105 (setf (buffer-head buffer) 0
106 (buffer-tail buffer) 0)
109 (defun release-buffer (buffer)
110 (reset-buffer buffer)
111 (with-available-buffers-lock ()
112 (push buffer *available-buffers*)))
114 ;;; This is a separate buffer management function, as it wants to be
115 ;;; clever about locking -- grabbing the lock just once.
116 (defun release-fd-stream-buffers (fd-stream)
117 (let ((ibuf (fd-stream-ibuf fd-stream))
118 (obuf (fd-stream-obuf fd-stream))
119 (queue (loop for item in (fd-stream-output-queue fd-stream)
121 collect (reset-buffer item))))
123 (push (reset-buffer ibuf) queue))
125 (push (reset-buffer obuf) queue))
126 ;; ...so, anything found?
128 ;; detach from stream
129 (setf (fd-stream-ibuf fd-stream) nil
130 (fd-stream-obuf fd-stream) nil
131 (fd-stream-output-queue fd-stream) nil)
132 ;; splice to *available-buffers*
133 (with-available-buffers-lock ()
134 (setf *available-buffers* (nconc queue *available-buffers*))))))
136 ;;;; the FD-STREAM structure
138 (defstruct (fd-stream
139 (:constructor %make-fd-stream)
140 (:conc-name fd-stream-)
141 (:predicate fd-stream-p)
142 (:include ansi-stream
143 (misc #'fd-stream-misc-routine))
146 ;; the name of this stream
148 ;; the file this stream is for
150 ;; the backup file namestring for the old file, for :IF-EXISTS
151 ;; :RENAME or :RENAME-AND-DELETE.
152 (original nil :type (or simple-string null))
153 (delete-original nil) ; for :if-exists :rename-and-delete
154 ;;; the number of bytes per element
155 (element-size 1 :type index)
156 ;; the type of element being transfered
157 (element-type 'base-char)
158 ;; the Unix file descriptor
160 ;; controls when the output buffer is flushed
161 (buffering :full :type (member :full :line :none))
162 ;; controls whether the input buffer must be cleared before output
163 ;; (must be done for files, not for sockets, pipes and other data
164 ;; sources where input and output aren't related). non-NIL means
165 ;; don't clear input buffer.
167 ;; character position if known -- this may run into bignums, but
168 ;; we probably should flip it into null then for efficiency's sake...
169 (char-pos nil :type (or unsigned-byte null))
170 ;; T if input is waiting on FD. :EOF if we hit EOF.
171 (listen nil :type (member nil t :eof))
175 (ibuf nil :type (or buffer null))
178 (obuf nil :type (or buffer null))
180 ;; output flushed, but not written due to non-blocking io?
183 ;; timeout specified for this stream as seconds or NIL if none
184 (timeout nil :type (or single-float null))
185 ;; pathname of the file this stream is opened to (returned by PATHNAME)
186 (pathname nil :type (or pathname null))
187 (external-format :default)
188 (output-bytes #'ill-out :type function))
189 (def!method print-object ((fd-stream fd-stream) stream)
190 (declare (type stream stream))
191 (print-unreadable-object (fd-stream stream :type t :identity t)
192 (format stream "for ~S" (fd-stream-name fd-stream))))
194 ;;;; CORE OUTPUT FUNCTIONS
196 ;;; Buffer the section of THING delimited by START and END by copying
197 ;;; to output buffer(s) of stream.
198 (defun buffer-output (stream thing start end)
199 (declare (index start end))
201 (error ":END before :START!"))
203 ;; Copy bytes from THING to buffers.
204 (flet ((copy-to-buffer (buffer tail count)
205 (declare (buffer buffer) (index tail count))
207 (let ((sap (buffer-sap buffer)))
210 (system-area-ub8-copy thing start sap tail count))
211 ((simple-unboxed-array (*))
212 (copy-ub8-to-system-area thing start sap tail count))))
213 ;; Not INCF! If another thread has moved tail from under
214 ;; us, we don't want to accidentally increment tail
215 ;; beyond buffer-length.
216 (setf (buffer-tail buffer) (+ count tail))
219 ;; First copy is special: the buffer may already contain
220 ;; something, or be even full.
221 (let* ((obuf (fd-stream-obuf stream))
222 (tail (buffer-tail obuf))
223 (space (- (buffer-length obuf) tail)))
225 (copy-to-buffer obuf tail (min space (- end start)))
226 (go :more-output-p)))
228 ;; Later copies should always have an empty buffer, since
229 ;; they are freshly flushed, but if another thread is
230 ;; stomping on the same buffer that might not be the case.
231 (let* ((obuf (flush-output-buffer stream))
232 (tail (buffer-tail obuf))
233 (space (- (buffer-length obuf) tail)))
234 (copy-to-buffer obuf tail (min space (- end start))))
237 (go :flush-and-fill))))))
239 ;;; Flush the current output buffer of the stream, ensuring that the
240 ;;; new buffer is empty. Returns (for convenience) the new output
241 ;;; buffer -- which may or may not be EQ to the old one. If the is no
242 ;;; queued output we try to write the buffer immediately -- otherwise
243 ;;; we queue it for later.
244 (defun flush-output-buffer (stream)
245 (let ((obuf (fd-stream-obuf stream)))
247 (let ((head (buffer-head obuf))
248 (tail (buffer-tail obuf)))
249 (cond ((eql head tail)
250 ;; Buffer is already empty -- just ensure that is is
251 ;; set to zero as well.
253 ((fd-stream-output-queue stream)
254 ;; There is already stuff on the queue -- go directly
257 (%queue-and-replace-output-buffer stream))
259 ;; Try a non-blocking write, queue whatever is left over.
261 (synchronize-stream-output stream)
262 (let ((length (- tail head)))
263 (multiple-value-bind (count errno)
264 (sb!unix:unix-write (fd-stream-fd stream) (buffer-sap obuf)
266 (cond ((eql count length)
267 ;; Complete write -- we can use the same buffer.
270 ;; Partial write -- update buffer status and queue.
271 ;; Do not use INCF! Another thread might have moved
273 (setf (buffer-head obuf) (+ count head))
274 (%queue-and-replace-output-buffer stream))
276 ((eql errno sb!unix:ewouldblock)
278 (%queue-and-replace-output-buffer stream))
280 (simple-stream-perror "Couldn't write to ~s"
281 stream errno)))))))))))
283 ;;; Helper for FLUSH-OUTPUT-BUFFER -- returns the new buffer.
284 (defun %queue-and-replace-output-buffer (stream)
285 (let ((queue (fd-stream-output-queue stream))
286 (later (list (or (fd-stream-obuf stream) (bug "Missing obuf."))))
288 ;; Important: before putting the buffer on queue, give the stream
289 ;; a new one. If we get an interrupt and unwind losing the buffer
290 ;; is relatively OK, but having the same buffer in two places
292 (setf (fd-stream-obuf stream) new)
296 (setf (fd-stream-output-queue stream) later)))
297 (unless (fd-stream-handler stream)
298 (setf (fd-stream-handler stream)
299 (add-fd-handler (fd-stream-fd stream)
302 (declare (ignore fd))
303 (write-output-from-queue stream)))))
306 ;;; This is called by the FD-HANDLER for the stream when output is
308 (defun write-output-from-queue (stream)
309 (synchronize-stream-output stream)
313 (let* ((buffer (pop (fd-stream-output-queue stream)))
314 (head (buffer-head buffer))
315 (length (- (buffer-tail buffer) head)))
316 (declare (index head length))
318 (multiple-value-bind (count errno)
319 (sb!unix:unix-write (fd-stream-fd stream) (buffer-sap buffer)
321 (cond ((eql count length)
322 ;; Complete write, see if we can do another right
323 ;; away, or remove the handler if we're done.
324 (release-buffer buffer)
325 (cond ((fd-stream-output-queue stream)
329 (let ((handler (fd-stream-handler stream)))
331 (setf (fd-stream-handler stream) nil)
332 (remove-fd-handler handler)))))
334 ;; Partial write. Update buffer status and requeue.
335 (aver (< count length))
336 ;; Do not use INCF! Another thread might have moved head.
337 (setf (buffer-head buffer) (+ head count))
338 (push buffer (fd-stream-output-queue stream)))
340 ;; We tried to do multiple writes, and finally our
341 ;; luck ran out. Requeue.
342 (push buffer (fd-stream-output-queue stream)))
344 ;; Could not write on the first try at all!
346 (simple-stream-perror "Couldn't write to ~S." stream errno)
348 (if (= errno sb!unix:ewouldblock)
349 (bug "Unexpected blocking in WRITE-OUTPUT-FROM-QUEUE.")
350 (simple-stream-perror "Couldn't write to ~S"
354 ;;; Try to write THING directly to STREAM without buffering, if
355 ;;; possible. If direct write doesn't happen, buffer.
356 (defun write-or-buffer-output (stream thing start end)
357 (declare (index start end))
358 (cond ((fd-stream-output-queue stream)
359 (buffer-output stream thing start end))
361 (error ":END before :START!"))
363 (let ((length (- end start)))
364 (synchronize-stream-output stream)
365 (multiple-value-bind (count errno)
366 (sb!unix:unix-write (fd-stream-fd stream) thing start length)
367 (cond ((eql count length)
368 ;; Complete write -- done!
371 (aver (< count length))
372 ;; Partial write -- buffer the rest.
373 (buffer-output stream thing (+ start count) end))
375 ;; Could not write -- buffer or error.
377 (simple-stream-perror "couldn't write to ~s" stream errno)
379 (if (= errno sb!unix:ewouldblock)
380 (buffer-output stream thing start end)
381 (simple-stream-perror "couldn't write to ~s" stream errno)))))))))
383 ;;; Deprecated -- can go away after 1.1 or so. Deprecated because
384 ;;; this is not something we want to export. Nikodemus thinks the
385 ;;; right thing is to support a low-level non-stream like IO layer,
386 ;;; akin to java.nio.
387 (defun output-raw-bytes (stream thing &optional start end)
388 (write-or-buffer-output stream thing (or start 0) (or end (length thing))))
390 (define-compiler-macro output-raw-bytes (stream thing &optional start end)
391 (deprecation-warning 'output-raw-bytes)
392 (let ((x (gensym "THING")))
394 (write-or-buffer-output ,stream ,x (or ,start 0) (or ,end (length ,x))))))
396 ;;;; output routines and related noise
398 (defvar *output-routines* ()
400 "List of all available output routines. Each element is a list of the
401 element-type output, the kind of buffering, the function name, and the number
402 of bytes per element.")
404 ;;; common idioms for reporting low-level stream and file problems
405 (defun simple-stream-perror (note-format stream errno)
406 (error 'simple-stream-error
408 :format-control "~@<~?: ~2I~_~A~:>"
409 :format-arguments (list note-format (list stream) (strerror errno))))
410 (defun simple-file-perror (note-format pathname errno)
411 (error 'simple-file-error
413 :format-control "~@<~?: ~2I~_~A~:>"
415 (list note-format (list pathname) (strerror errno))))
417 (defun stream-decoding-error (stream octets)
418 (error 'stream-decoding-error
420 ;; FIXME: dunno how to get at OCTETS currently, or even if
421 ;; that's the right thing to report.
423 (defun stream-encoding-error (stream code)
424 (error 'stream-encoding-error
428 (defun c-string-encoding-error (external-format code)
429 (error 'c-string-encoding-error
430 :external-format external-format
433 (defun c-string-decoding-error (external-format octets)
434 (error 'c-string-decoding-error
435 :external-format external-format
438 ;;; Returning true goes into end of file handling, false will enter another
439 ;;; round of input buffer filling followed by re-entering character decode.
440 (defun stream-decoding-error-and-handle (stream octet-count)
442 (stream-decoding-error stream
443 (let* ((buffer (fd-stream-ibuf stream))
444 (sap (buffer-sap buffer))
445 (head (buffer-head buffer)))
446 (loop for i from 0 below octet-count
447 collect (sap-ref-8 sap (+ head i)))))
449 :report (lambda (stream)
451 "~@<Attempt to resync the stream at a character ~
452 character boundary and continue.~@:>"))
453 (fd-stream-resync stream)
455 (force-end-of-file ()
456 :report (lambda (stream)
457 (format stream "~@<Force an end of file.~@:>"))
460 (defun stream-encoding-error-and-handle (stream code)
462 (stream-encoding-error stream code)
464 :report (lambda (stream)
465 (format stream "~@<Skip output of this character.~@:>"))
466 (throw 'output-nothing nil))))
468 (defun external-format-encoding-error (stream code)
470 (stream-encoding-error-and-handle stream code)
471 (c-string-encoding-error stream code)))
473 (defun external-format-decoding-error (stream octet-count)
475 (stream-decoding-error stream octet-count)
476 (c-string-decoding-error stream octet-count)))
478 (defun synchronize-stream-output (stream)
479 ;; If we're reading and writing on the same file, flush buffered
480 ;; input and rewind file position accordingly.
481 (unless (fd-stream-dual-channel-p stream)
482 (let ((adjust (nth-value 1 (flush-input-buffer stream))))
483 (unless (eql 0 adjust)
484 (sb!unix:unix-lseek (fd-stream-fd stream) (- adjust) sb!unix:l_incr)))))
486 (defun fd-stream-output-finished-p (stream)
487 (let ((obuf (fd-stream-obuf stream)))
489 (and (zerop (buffer-tail obuf))
490 (not (fd-stream-output-queue stream))))))
492 (defmacro output-wrapper/variable-width ((stream size buffering restart)
494 (let ((stream-var (gensym "STREAM")))
495 `(let* ((,stream-var ,stream)
496 (obuf (fd-stream-obuf ,stream-var))
497 (tail (buffer-tail obuf))
499 ,(unless (eq (car buffering) :none)
500 `(when (<= (buffer-length obuf) (+ tail size))
501 (setf obuf (flush-output-buffer ,stream-var)
502 tail (buffer-tail obuf))))
503 ,(unless (eq (car buffering) :none)
504 ;; FIXME: Why this here? Doesn't seem necessary.
505 `(synchronize-stream-output ,stream-var))
507 `(catch 'output-nothing
509 (setf (buffer-tail obuf) (+ tail size)))
512 (setf (buffer-tail obuf) (+ tail size))))
513 ,(ecase (car buffering)
515 `(flush-output-buffer ,stream-var))
517 `(when (eql byte #\Newline)
518 (flush-output-buffer ,stream-var)))
522 (defmacro output-wrapper ((stream size buffering restart) &body body)
523 (let ((stream-var (gensym "STREAM")))
524 `(let* ((,stream-var ,stream)
525 (obuf (fd-stream-obuf ,stream-var))
526 (tail (buffer-tail obuf)))
527 ,(unless (eq (car buffering) :none)
528 `(when (<= (buffer-length obuf) (+ tail ,size))
529 (setf obuf (flush-output-buffer ,stream-var)
530 tail (buffer-tail obuf))))
531 ;; FIXME: Why this here? Doesn't seem necessary.
532 ,(unless (eq (car buffering) :none)
533 `(synchronize-stream-output ,stream-var))
535 `(catch 'output-nothing
537 (setf (buffer-tail obuf) (+ tail ,size)))
540 (setf (buffer-tail obuf) (+ tail ,size))))
541 ,(ecase (car buffering)
543 `(flush-output-buffer ,stream-var))
545 `(when (eql byte #\Newline)
546 (flush-output-buffer ,stream-var)))
550 (defmacro def-output-routines/variable-width
551 ((name-fmt size restart external-format &rest bufferings)
553 (declare (optimize (speed 1)))
558 (intern (format nil name-fmt (string (car buffering))))))
560 (defun ,function (stream byte)
561 (declare (ignorable byte))
562 (output-wrapper/variable-width (stream ,size ,buffering ,restart)
564 (setf *output-routines*
565 (nconc *output-routines*
573 (cdr buffering)))))))
576 ;;; Define output routines that output numbers SIZE bytes long for the
577 ;;; given bufferings. Use BODY to do the actual output.
578 (defmacro def-output-routines ((name-fmt size restart &rest bufferings)
580 (declare (optimize (speed 1)))
585 (intern (format nil name-fmt (string (car buffering))))))
587 (defun ,function (stream byte)
588 (output-wrapper (stream ,size ,buffering ,restart)
590 (setf *output-routines*
591 (nconc *output-routines*
599 (cdr buffering)))))))
602 ;;; FIXME: is this used anywhere any more?
603 (def-output-routines ("OUTPUT-CHAR-~A-BUFFERED"
609 (if (eql byte #\Newline)
610 (setf (fd-stream-char-pos stream) 0)
611 (incf (fd-stream-char-pos stream)))
612 (setf (sap-ref-8 (buffer-sap obuf) tail)
615 (def-output-routines ("OUTPUT-UNSIGNED-BYTE-~A-BUFFERED"
618 (:none (unsigned-byte 8))
619 (:full (unsigned-byte 8)))
620 (setf (sap-ref-8 (buffer-sap obuf) tail)
623 (def-output-routines ("OUTPUT-SIGNED-BYTE-~A-BUFFERED"
626 (:none (signed-byte 8))
627 (:full (signed-byte 8)))
628 (setf (signed-sap-ref-8 (buffer-sap obuf) tail)
631 (def-output-routines ("OUTPUT-UNSIGNED-SHORT-~A-BUFFERED"
634 (:none (unsigned-byte 16))
635 (:full (unsigned-byte 16)))
636 (setf (sap-ref-16 (buffer-sap obuf) tail)
639 (def-output-routines ("OUTPUT-SIGNED-SHORT-~A-BUFFERED"
642 (:none (signed-byte 16))
643 (:full (signed-byte 16)))
644 (setf (signed-sap-ref-16 (buffer-sap obuf) tail)
647 (def-output-routines ("OUTPUT-UNSIGNED-LONG-~A-BUFFERED"
650 (:none (unsigned-byte 32))
651 (:full (unsigned-byte 32)))
652 (setf (sap-ref-32 (buffer-sap obuf) tail)
655 (def-output-routines ("OUTPUT-SIGNED-LONG-~A-BUFFERED"
658 (:none (signed-byte 32))
659 (:full (signed-byte 32)))
660 (setf (signed-sap-ref-32 (buffer-sap obuf) tail)
663 #+#.(cl:if (cl:= sb!vm:n-word-bits 64) '(and) '(or))
665 (def-output-routines ("OUTPUT-UNSIGNED-LONG-LONG-~A-BUFFERED"
668 (:none (unsigned-byte 64))
669 (:full (unsigned-byte 64)))
670 (setf (sap-ref-64 (buffer-sap obuf) tail)
672 (def-output-routines ("OUTPUT-SIGNED-LONG-LONG-~A-BUFFERED"
675 (:none (signed-byte 64))
676 (:full (signed-byte 64)))
677 (setf (signed-sap-ref-64 (buffer-sap obuf) tail)
680 ;;; the routine to use to output a string. If the stream is
681 ;;; unbuffered, slam the string down the file descriptor, otherwise
682 ;;; use OUTPUT-RAW-BYTES to buffer the string. Update charpos by
683 ;;; checking to see where the last newline was.
684 (defun fd-sout (stream thing start end)
685 (declare (type fd-stream stream) (type string thing))
686 (let ((start (or start 0))
687 (end (or end (length (the vector thing)))))
688 (declare (fixnum start end))
690 (string-dispatch (simple-base-string
692 (simple-array character (*))
695 (position #\newline thing :from-end t
696 :start start :end end))))
697 (if (and (typep thing 'base-string)
698 (eq (fd-stream-external-format stream) :latin-1))
699 (ecase (fd-stream-buffering stream)
701 (buffer-output stream thing start end))
703 (buffer-output stream thing start end)
705 (flush-output-buffer stream)))
707 (write-or-buffer-output stream thing start end)))
708 (ecase (fd-stream-buffering stream)
709 (:full (funcall (fd-stream-output-bytes stream)
710 stream thing nil start end))
711 (:line (funcall (fd-stream-output-bytes stream)
712 stream thing last-newline start end))
713 (:none (funcall (fd-stream-output-bytes stream)
714 stream thing t start end))))
716 (setf (fd-stream-char-pos stream) (- end last-newline 1))
717 (incf (fd-stream-char-pos stream) (- end start))))))
719 (defvar *external-formats* ()
721 "List of all available external formats. Each element is a list of the
722 element-type, string input function name, character input function name,
723 and string output function name.")
725 (defun get-external-format (external-format)
726 (dolist (entry *external-formats*)
727 (when (member external-format (first entry))
730 (defun get-external-format-function (external-format index)
731 (let ((entry (get-external-format external-format)))
732 (when entry (nth index entry))))
734 ;;; Find an output routine to use given the type and buffering. Return
735 ;;; as multiple values the routine, the real type transfered, and the
736 ;;; number of bytes per element.
737 (defun pick-output-routine (type buffering &optional external-format)
738 (when (subtypep type 'character)
739 (let ((entry (get-external-format external-format)))
741 (return-from pick-output-routine
742 (values (symbol-function (nth (ecase buffering
749 (symbol-function (fourth entry))
750 (first (first entry)))))))
751 (dolist (entry *output-routines*)
752 (when (and (subtypep type (first entry))
753 (eq buffering (second entry))
754 (or (not (fifth entry))
755 (eq external-format (fifth entry))))
756 (return-from pick-output-routine
757 (values (symbol-function (third entry))
760 ;; KLUDGE: dealing with the buffering here leads to excessive code
763 ;; KLUDGE: also see comments in PICK-INPUT-ROUTINE
764 (loop for i from 40 by 8 to 1024 ; ARB (KLUDGE)
765 if (subtypep type `(unsigned-byte ,i))
766 do (return-from pick-output-routine
770 (lambda (stream byte)
771 (output-wrapper (stream (/ i 8) (:none) nil)
772 (loop for j from 0 below (/ i 8)
773 do (setf (sap-ref-8 (buffer-sap obuf)
775 (ldb (byte 8 (- i 8 (* j 8))) byte))))))
777 (lambda (stream byte)
778 (output-wrapper (stream (/ i 8) (:full) nil)
779 (loop for j from 0 below (/ i 8)
780 do (setf (sap-ref-8 (buffer-sap obuf)
782 (ldb (byte 8 (- i 8 (* j 8))) byte)))))))
785 (loop for i from 40 by 8 to 1024 ; ARB (KLUDGE)
786 if (subtypep type `(signed-byte ,i))
787 do (return-from pick-output-routine
791 (lambda (stream byte)
792 (output-wrapper (stream (/ i 8) (:none) nil)
793 (loop for j from 0 below (/ i 8)
794 do (setf (sap-ref-8 (buffer-sap obuf)
796 (ldb (byte 8 (- i 8 (* j 8))) byte))))))
798 (lambda (stream byte)
799 (output-wrapper (stream (/ i 8) (:full) nil)
800 (loop for j from 0 below (/ i 8)
801 do (setf (sap-ref-8 (buffer-sap obuf)
803 (ldb (byte 8 (- i 8 (* j 8))) byte)))))))
807 ;;;; input routines and related noise
809 ;;; a list of all available input routines. Each element is a list of
810 ;;; the element-type input, the function name, and the number of bytes
812 (defvar *input-routines* ())
814 ;;; Return whether a primitive partial read operation on STREAM's FD
815 ;;; would (probably) block. Signal a `simple-stream-error' if the
816 ;;; system call implementing this operation fails.
818 ;;; It is "may" instead of "would" because "would" is not quite
819 ;;; correct on win32. However, none of the places that use it require
820 ;;; further assurance than "may" versus "will definitely not".
821 (defun sysread-may-block-p (stream)
823 ;; This answers T at EOF on win32, I think.
824 (not (sb!win32:fd-listen (fd-stream-fd stream)))
826 (sb!unix:with-restarted-syscall (count errno)
827 (sb!alien:with-alien ((read-fds (sb!alien:struct sb!unix:fd-set)))
828 (sb!unix:fd-zero read-fds)
829 (sb!unix:fd-set (fd-stream-fd stream) read-fds)
830 (sb!unix:unix-fast-select (1+ (fd-stream-fd stream))
831 (sb!alien:addr read-fds)
837 (simple-stream-perror "couldn't check whether ~S is readable"
841 ;;; If the read would block wait (using SERVE-EVENT) till input is available,
842 ;;; then fill the input buffer, and return the number of bytes read. Throws
843 ;;; to EOF-INPUT-CATCHER if the eof was reached.
844 (defun refill-input-buffer (stream)
845 (let ((fd (fd-stream-fd stream))
849 ;; Check for blocking input before touching the stream, as if
850 ;; we happen to wait we are liable to be interrupted, and the
851 ;; interrupt handler may use the same stream.
852 (if (sysread-may-block-p stream)
855 ;; These (:CLOSED-FLAME and :READ-ERROR) tags are here so what
856 ;; we can signal errors outside the WITHOUT-INTERRUPTS.
858 (closed-flame stream)
860 (simple-stream-perror "couldn't read from ~S" stream errno)
862 ;; This tag is here so we can unwind outside the WITHOUT-INTERRUPTS
863 ;; to wait for input if read tells us EWOULDBLOCK.
864 (unless (wait-until-fd-usable fd :input (fd-stream-timeout stream))
865 (signal-timeout 'io-timeout :stream stream :direction :read
866 :seconds (fd-stream-timeout stream)))
868 ;; Since the read should not block, we'll disable the
869 ;; interrupts here, so that we don't accidentally unwind and
870 ;; leave the stream in an inconsistent state.
872 ;; Check the buffer: if it is null, then someone has closed
873 ;; the stream from underneath us. This is not ment to fix
874 ;; multithreaded races, but to deal with interrupt handlers
875 ;; closing the stream.
876 (let* ((ibuf (or (fd-stream-ibuf stream) (go :closed-flame)))
877 (sap (buffer-sap ibuf))
878 (length (buffer-length ibuf))
879 (head (buffer-head ibuf))
880 (tail (buffer-tail ibuf)))
881 (declare (index length head tail))
883 (cond ((eql head tail)
884 ;; Buffer is empty, but not at yet reset -- make it so.
889 ;; Buffer has things in it, but they are not at the head
890 ;; -- move them there.
891 (let ((n (- tail head)))
892 (system-area-ub8-copy sap head sap 0 n)
894 (buffer-head ibuf) head
896 (buffer-tail ibuf) tail)))))
897 (setf (fd-stream-listen stream) nil)
898 (setf (values count errno)
899 (sb!unix:unix-read fd (sap+ sap tail) (- length tail)))
904 (if (eql errno sb!unix:ewouldblock)
908 (setf (fd-stream-listen stream) :eof)
909 (/show0 "THROWing EOF-INPUT-CATCHER")
910 (throw 'eof-input-catcher nil))
912 ;; Success! (Do not use INCF, for sake of other threads.)
913 (setf (buffer-tail ibuf) (+ count tail)))))))
916 ;;; Make sure there are at least BYTES number of bytes in the input
917 ;;; buffer. Keep calling REFILL-INPUT-BUFFER until that condition is met.
918 (defmacro input-at-least (stream bytes)
919 (let ((stream-var (gensym "STREAM"))
920 (bytes-var (gensym "BYTES"))
921 (buffer-var (gensym "IBUF")))
922 `(let* ((,stream-var ,stream)
924 (,buffer-var (fd-stream-ibuf ,stream-var)))
926 (when (>= (- (buffer-tail ,buffer-var)
927 (buffer-head ,buffer-var))
930 (refill-input-buffer ,stream-var)))))
932 (defmacro input-wrapper/variable-width ((stream bytes eof-error eof-value)
934 (let ((stream-var (gensym "STREAM"))
935 (retry-var (gensym "RETRY"))
936 (element-var (gensym "ELT")))
937 `(let* ((,stream-var ,stream)
938 (ibuf (fd-stream-ibuf ,stream-var))
940 (if (fd-stream-unread ,stream-var)
942 (fd-stream-unread ,stream-var)
943 (setf (fd-stream-unread ,stream-var) nil)
944 (setf (fd-stream-listen ,stream-var) nil))
945 (let ((,element-var nil)
946 (decode-break-reason nil))
950 (catch 'eof-input-catcher
951 (setf decode-break-reason
952 (block decode-break-reason
953 (input-at-least ,stream-var 1)
954 (let* ((byte (sap-ref-8 (buffer-sap ibuf)
955 (buffer-head ibuf))))
956 (declare (ignorable byte))
958 (input-at-least ,stream-var size)
959 (setq ,element-var (locally ,@read-forms))
960 (setq ,retry-var nil))
962 (when decode-break-reason
963 (stream-decoding-error-and-handle stream
964 decode-break-reason))
966 (let ((octet-count (- (buffer-tail ibuf)
967 (buffer-head ibuf))))
968 (when (or (zerop octet-count)
969 (and (not ,element-var)
970 (not decode-break-reason)
971 (stream-decoding-error-and-handle
972 stream octet-count)))
973 (setq ,retry-var nil)))))
975 (incf (buffer-head ibuf) size)
978 (eof-or-lose ,stream-var ,eof-error ,eof-value))))))))
980 ;;; a macro to wrap around all input routines to handle EOF-ERROR noise
981 (defmacro input-wrapper ((stream bytes eof-error eof-value) &body read-forms)
982 (let ((stream-var (gensym "STREAM"))
983 (element-var (gensym "ELT")))
984 `(let* ((,stream-var ,stream)
985 (ibuf (fd-stream-ibuf ,stream-var)))
986 (if (fd-stream-unread ,stream-var)
988 (fd-stream-unread ,stream-var)
989 (setf (fd-stream-unread ,stream-var) nil)
990 (setf (fd-stream-listen ,stream-var) nil))
992 (catch 'eof-input-catcher
993 (input-at-least ,stream-var ,bytes)
994 (locally ,@read-forms))))
996 (incf (buffer-head (fd-stream-ibuf ,stream-var)) ,bytes)
999 (eof-or-lose ,stream-var ,eof-error ,eof-value))))))))
1001 (defmacro def-input-routine/variable-width (name
1002 (type external-format size sap head)
1005 (defun ,name (stream eof-error eof-value)
1006 (input-wrapper/variable-width (stream ,size eof-error eof-value)
1007 (let ((,sap (buffer-sap ibuf))
1008 (,head (buffer-head ibuf)))
1010 (setf *input-routines*
1011 (nconc *input-routines*
1012 (list (list ',type ',name 1 ',external-format))))))
1014 (defmacro def-input-routine (name
1015 (type size sap head)
1018 (defun ,name (stream eof-error eof-value)
1019 (input-wrapper (stream ,size eof-error eof-value)
1020 (let ((,sap (buffer-sap ibuf))
1021 (,head (buffer-head ibuf)))
1023 (setf *input-routines*
1024 (nconc *input-routines*
1025 (list (list ',type ',name ',size nil))))))
1027 ;;; STREAM-IN routine for reading a string char
1028 (def-input-routine input-character
1029 (character 1 sap head)
1030 (code-char (sap-ref-8 sap head)))
1032 ;;; STREAM-IN routine for reading an unsigned 8 bit number
1033 (def-input-routine input-unsigned-8bit-byte
1034 ((unsigned-byte 8) 1 sap head)
1035 (sap-ref-8 sap head))
1037 ;;; STREAM-IN routine for reading a signed 8 bit number
1038 (def-input-routine input-signed-8bit-number
1039 ((signed-byte 8) 1 sap head)
1040 (signed-sap-ref-8 sap head))
1042 ;;; STREAM-IN routine for reading an unsigned 16 bit number
1043 (def-input-routine input-unsigned-16bit-byte
1044 ((unsigned-byte 16) 2 sap head)
1045 (sap-ref-16 sap head))
1047 ;;; STREAM-IN routine for reading a signed 16 bit number
1048 (def-input-routine input-signed-16bit-byte
1049 ((signed-byte 16) 2 sap head)
1050 (signed-sap-ref-16 sap head))
1052 ;;; STREAM-IN routine for reading a unsigned 32 bit number
1053 (def-input-routine input-unsigned-32bit-byte
1054 ((unsigned-byte 32) 4 sap head)
1055 (sap-ref-32 sap head))
1057 ;;; STREAM-IN routine for reading a signed 32 bit number
1058 (def-input-routine input-signed-32bit-byte
1059 ((signed-byte 32) 4 sap head)
1060 (signed-sap-ref-32 sap head))
1062 #+#.(cl:if (cl:= sb!vm:n-word-bits 64) '(and) '(or))
1064 (def-input-routine input-unsigned-64bit-byte
1065 ((unsigned-byte 64) 8 sap head)
1066 (sap-ref-64 sap head))
1067 (def-input-routine input-signed-64bit-byte
1068 ((signed-byte 64) 8 sap head)
1069 (signed-sap-ref-64 sap head)))
1071 ;;; Find an input routine to use given the type. Return as multiple
1072 ;;; values the routine, the real type transfered, and the number of
1073 ;;; bytes per element (and for character types string input routine).
1074 (defun pick-input-routine (type &optional external-format)
1075 (when (subtypep type 'character)
1076 (dolist (entry *external-formats*)
1077 (when (member external-format (first entry))
1078 (return-from pick-input-routine
1079 (values (symbol-function (third entry))
1082 (symbol-function (second entry))
1083 (first (first entry)))))))
1084 (dolist (entry *input-routines*)
1085 (when (and (subtypep type (first entry))
1086 (or (not (fourth entry))
1087 (eq external-format (fourth entry))))
1088 (return-from pick-input-routine
1089 (values (symbol-function (second entry))
1092 ;; FIXME: let's do it the hard way, then (but ignore things like
1093 ;; endianness, efficiency, and the necessary coupling between these
1094 ;; and the output routines). -- CSR, 2004-02-09
1095 (loop for i from 40 by 8 to 1024 ; ARB (well, KLUDGE really)
1096 if (subtypep type `(unsigned-byte ,i))
1097 do (return-from pick-input-routine
1099 (lambda (stream eof-error eof-value)
1100 (input-wrapper (stream (/ i 8) eof-error eof-value)
1101 (let ((sap (buffer-sap ibuf))
1102 (head (buffer-head ibuf)))
1103 (loop for j from 0 below (/ i 8)
1107 (sap-ref-8 sap (+ head j))))
1108 finally (return result)))))
1111 (loop for i from 40 by 8 to 1024 ; ARB (well, KLUDGE really)
1112 if (subtypep type `(signed-byte ,i))
1113 do (return-from pick-input-routine
1115 (lambda (stream eof-error eof-value)
1116 (input-wrapper (stream (/ i 8) eof-error eof-value)
1117 (let ((sap (buffer-sap ibuf))
1118 (head (buffer-head ibuf)))
1119 (loop for j from 0 below (/ i 8)
1123 (sap-ref-8 sap (+ head j))))
1124 finally (return (if (logbitp (1- i) result)
1125 (dpb result (byte i 0) -1)
1130 ;;; the N-BIN method for FD-STREAMs
1132 ;;; Note that this blocks in UNIX-READ. It is generally used where
1133 ;;; there is a definite amount of reading to be done, so blocking
1134 ;;; isn't too problematical.
1135 (defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p
1136 &aux (total-copied 0))
1137 (declare (type fd-stream stream))
1138 (declare (type index start requested total-copied))
1139 (let ((unread (fd-stream-unread stream)))
1141 ;; AVERs designed to fail when we have more complicated
1142 ;; character representations.
1143 (aver (typep unread 'base-char))
1144 (aver (= (fd-stream-element-size stream) 1))
1145 ;; KLUDGE: this is a slightly-unrolled-and-inlined version of
1148 (system-area-pointer
1149 (setf (sap-ref-8 buffer start) (char-code unread)))
1150 ((simple-unboxed-array (*))
1151 (setf (aref buffer start) unread)))
1152 (setf (fd-stream-unread stream) nil)
1153 (setf (fd-stream-listen stream) nil)
1154 (incf total-copied)))
1157 (let* ((remaining-request (- requested total-copied))
1158 (ibuf (fd-stream-ibuf stream))
1159 (head (buffer-head ibuf))
1160 (tail (buffer-tail ibuf))
1161 (available (- tail head))
1162 (n-this-copy (min remaining-request available))
1163 (this-start (+ start total-copied))
1164 (this-end (+ this-start n-this-copy))
1165 (sap (buffer-sap ibuf)))
1166 (declare (type index remaining-request head tail available))
1167 (declare (type index n-this-copy))
1168 ;; Copy data from stream buffer into user's buffer.
1169 (%byte-blt sap head buffer this-start this-end)
1170 (incf (buffer-head ibuf) n-this-copy)
1171 (incf total-copied n-this-copy)
1172 ;; Maybe we need to refill the stream buffer.
1173 (cond (;; If there were enough data in the stream buffer, we're done.
1174 (eql total-copied requested)
1175 (return total-copied))
1176 (;; If EOF, we're done in another way.
1177 (null (catch 'eof-input-catcher (refill-input-buffer stream)))
1179 (error 'end-of-file :stream stream)
1180 (return total-copied)))
1181 ;; Otherwise we refilled the stream buffer, so fall
1182 ;; through into another pass of the loop.
1185 (defun fd-stream-resync (stream)
1186 (dolist (entry *external-formats*)
1187 (when (member (fd-stream-external-format stream) (first entry))
1188 (return-from fd-stream-resync
1189 (funcall (symbol-function (eighth entry)) stream)))))
1191 (defun get-fd-stream-character-sizer (stream)
1192 (dolist (entry *external-formats*)
1193 (when (member (fd-stream-external-format stream) (first entry))
1194 (return-from get-fd-stream-character-sizer (ninth entry)))))
1196 (defun fd-stream-character-size (stream char)
1197 (let ((sizer (get-fd-stream-character-sizer stream)))
1198 (when sizer (funcall sizer char))))
1200 (defun fd-stream-string-size (stream string)
1201 (let ((sizer (get-fd-stream-character-sizer stream)))
1203 (loop for char across string summing (funcall sizer char)))))
1205 (defun find-external-format (external-format)
1206 (when external-format
1207 (find external-format *external-formats* :test #'member :key #'car)))
1209 (defun variable-width-external-format-p (ef-entry)
1210 (when (eighth ef-entry) t))
1212 (defun bytes-for-char-fun (ef-entry)
1213 (if ef-entry (symbol-function (ninth ef-entry)) (constantly 1)))
1215 ;;; FIXME: OAOOM here vrt. *EXTERNAL-FORMAT-FUNCTIONS* in fd-stream.lisp
1216 (defmacro define-external-format (external-format size output-restart
1218 (let* ((name (first external-format))
1219 (out-function (symbolicate "OUTPUT-BYTES/" name))
1220 (format (format nil "OUTPUT-CHAR-~A-~~A-BUFFERED" (string name)))
1221 (in-function (symbolicate "FD-STREAM-READ-N-CHARACTERS/" name))
1222 (in-char-function (symbolicate "INPUT-CHAR/" name))
1223 (size-function (symbolicate "BYTES-FOR-CHAR/" name))
1224 (read-c-string-function (symbolicate "READ-FROM-C-STRING/" name))
1225 (output-c-string-function (symbolicate "OUTPUT-TO-C-STRING/" name))
1226 (n-buffer (gensym "BUFFER")))
1228 (defun ,size-function (byte)
1229 (declare (ignore byte))
1231 (defun ,out-function (stream string flush-p start end)
1232 (let ((start (or start 0))
1233 (end (or end (length string))))
1234 (declare (type index start end))
1235 (synchronize-stream-output stream)
1236 (unless (<= 0 start end (length string))
1237 (signal-bounding-indices-bad-error string start end))
1240 (let ((obuf (fd-stream-obuf stream)))
1241 (setf (buffer-tail obuf)
1242 (string-dispatch (simple-base-string
1244 (simple-array character (*))
1247 (let ((sap (buffer-sap obuf))
1248 (len (buffer-length obuf))
1250 (tail (buffer-tail obuf)))
1251 (declare (type index tail)
1252 ;; STRING bounds have already been checked.
1253 (optimize (safety 0)))
1255 (,@(if output-restart
1256 `(catch 'output-nothing)
1259 ((or (= start end) (< (- len tail) 4)))
1260 (let* ((byte (aref string start))
1261 (bits (char-code byte)))
1265 ;; Exited from the loop normally
1267 ;; Exited via CATCH. Skip the current character
1268 ;; and try the inner loop again.
1271 (flush-output-buffer stream)))
1273 (flush-output-buffer stream))))
1274 (def-output-routines (,format
1280 (if (eql byte #\Newline)
1281 (setf (fd-stream-char-pos stream) 0)
1282 (incf (fd-stream-char-pos stream)))
1283 (let* ((obuf (fd-stream-obuf stream))
1284 (bits (char-code byte))
1285 (sap (buffer-sap obuf))
1286 (tail (buffer-tail obuf)))
1288 (defun ,in-function (stream buffer start requested eof-error-p
1289 &aux (index start) (end (+ start requested)))
1290 (declare (type fd-stream stream)
1291 (type index start requested index end)
1293 (simple-array character (#.+ansi-stream-in-buffer-length+))
1295 (let ((unread (fd-stream-unread stream)))
1297 (setf (aref buffer index) unread)
1298 (setf (fd-stream-unread stream) nil)
1299 (setf (fd-stream-listen stream) nil)
1303 (let* ((ibuf (fd-stream-ibuf stream))
1304 (head (buffer-head ibuf))
1305 (tail (buffer-tail ibuf))
1306 (sap (buffer-sap ibuf)))
1307 (declare (type index head tail)
1308 (type system-area-pointer sap))
1309 ;; Copy data from stream buffer into user's buffer.
1310 (dotimes (i (min (truncate (- tail head) ,size)
1312 (declare (optimize speed))
1313 (let* ((byte (sap-ref-8 sap head)))
1314 (setf (aref buffer index) ,in-expr)
1317 (setf (buffer-head ibuf) head)
1318 ;; Maybe we need to refill the stream buffer.
1319 (cond ( ;; If there was enough data in the stream buffer, we're done.
1321 (return (- index start)))
1322 ( ;; If EOF, we're done in another way.
1323 (null (catch 'eof-input-catcher (refill-input-buffer stream)))
1325 (error 'end-of-file :stream stream)
1326 (return (- index start))))
1327 ;; Otherwise we refilled the stream buffer, so fall
1328 ;; through into another pass of the loop.
1330 (def-input-routine ,in-char-function (character ,size sap head)
1331 (let ((byte (sap-ref-8 sap head)))
1333 (defun ,read-c-string-function (sap element-type)
1334 (declare (type system-area-pointer sap)
1335 (type (member character base-char) element-type))
1337 (declare (optimize (speed 3) (safety 0)))
1338 (let* ((stream ,name)
1340 (loop for head of-type index upfrom 0 by ,size
1341 for count of-type index upto (1- array-dimension-limit)
1342 for byte = (sap-ref-8 sap head)
1343 for char of-type character = ,in-expr
1344 until (zerop (char-code char))
1345 finally (return count)))
1346 ;; Inline the common cases
1347 (string (make-string length :element-type element-type)))
1348 (declare (ignorable stream)
1350 (type simple-string string))
1351 (/show0 before-copy-loop)
1352 (loop for head of-type index upfrom 0 by ,size
1353 for index of-type index below length
1354 for byte = (sap-ref-8 sap head)
1355 for char of-type character = ,in-expr
1356 do (setf (aref string index) char))
1357 string))) ;; last loop rewrite to dotimes?
1358 (defun ,output-c-string-function (string)
1359 (declare (type simple-string string))
1361 (declare (optimize (speed 3) (safety 0)))
1362 (let* ((length (length string))
1363 (,n-buffer (make-array (* (1+ length) ,size)
1364 :element-type '(unsigned-byte 8)))
1367 (declare (type index length tail))
1368 (with-pinned-objects (,n-buffer)
1369 (let ((sap (vector-sap ,n-buffer)))
1370 (declare (system-area-pointer sap))
1372 (let* ((byte (aref string i))
1373 (bits (char-code byte)))
1374 (declare (ignorable byte bits))
1378 (byte (code-char bits)))
1379 (declare (ignorable bits byte))
1382 (setf *external-formats*
1383 (cons '(,external-format ,in-function ,in-char-function ,out-function
1384 ,@(mapcar #'(lambda (buffering)
1385 (intern (format nil format (string buffering))))
1386 '(:none :line :full))
1387 nil ; no resync-function
1388 ,size-function ,read-c-string-function ,output-c-string-function)
1389 *external-formats*)))))
1391 (defmacro define-external-format/variable-width
1392 (external-format output-restart out-size-expr
1393 out-expr in-size-expr in-expr)
1394 (let* ((name (first external-format))
1395 (out-function (symbolicate "OUTPUT-BYTES/" name))
1396 (format (format nil "OUTPUT-CHAR-~A-~~A-BUFFERED" (string name)))
1397 (in-function (symbolicate "FD-STREAM-READ-N-CHARACTERS/" name))
1398 (in-char-function (symbolicate "INPUT-CHAR/" name))
1399 (resync-function (symbolicate "RESYNC/" name))
1400 (size-function (symbolicate "BYTES-FOR-CHAR/" name))
1401 (read-c-string-function (symbolicate "READ-FROM-C-STRING/" name))
1402 (output-c-string-function (symbolicate "OUTPUT-TO-C-STRING/" name))
1403 (n-buffer (gensym "BUFFER")))
1405 (defun ,size-function (byte)
1406 (declare (ignorable byte))
1408 (defun ,out-function (stream string flush-p start end)
1409 (let ((start (or start 0))
1410 (end (or end (length string))))
1411 (declare (type index start end))
1412 (synchronize-stream-output stream)
1413 (unless (<= 0 start end (length string))
1414 (signal-bounding-indices-bad-error string start end))
1417 (let ((obuf (fd-stream-obuf stream)))
1418 (setf (buffer-tail obuf)
1419 (string-dispatch (simple-base-string
1421 (simple-array character (*))
1424 (let ((len (buffer-length obuf))
1425 (sap (buffer-sap obuf))
1427 (tail (buffer-tail obuf)))
1428 (declare (type index tail)
1429 ;; STRING bounds have already been checked.
1430 (optimize (safety 0)))
1432 (,@(if output-restart
1433 `(catch 'output-nothing)
1436 ((or (= start end) (< (- len tail) 4)))
1437 (let* ((byte (aref string start))
1438 (bits (char-code byte))
1439 (size ,out-size-expr))
1443 ;; Exited from the loop normally
1445 ;; Exited via CATCH. Skip the current character
1446 ;; and try the inner loop again.
1449 (flush-output-buffer stream)))
1451 (flush-output-buffer stream))))
1452 (def-output-routines/variable-width (,format
1459 (if (eql byte #\Newline)
1460 (setf (fd-stream-char-pos stream) 0)
1461 (incf (fd-stream-char-pos stream)))
1462 (let ((bits (char-code byte))
1463 (sap (buffer-sap obuf))
1464 (tail (buffer-tail obuf)))
1466 (defun ,in-function (stream buffer start requested eof-error-p
1467 &aux (total-copied 0))
1468 (declare (type fd-stream stream)
1469 (type index start requested total-copied)
1471 (simple-array character (#.+ansi-stream-in-buffer-length+))
1473 (let ((unread (fd-stream-unread stream)))
1475 (setf (aref buffer start) unread)
1476 (setf (fd-stream-unread stream) nil)
1477 (setf (fd-stream-listen stream) nil)
1478 (incf total-copied)))
1481 (let* ((ibuf (fd-stream-ibuf stream))
1482 (head (buffer-head ibuf))
1483 (tail (buffer-tail ibuf))
1484 (sap (buffer-sap ibuf))
1485 (decode-break-reason nil))
1486 (declare (type index head tail))
1487 ;; Copy data from stream buffer into user's buffer.
1488 (do ((size nil nil))
1489 ((or (= tail head) (= requested total-copied)))
1490 (setf decode-break-reason
1491 (block decode-break-reason
1492 (let ((byte (sap-ref-8 sap head)))
1493 (declare (ignorable byte))
1494 (setq size ,in-size-expr)
1495 (when (> size (- tail head))
1497 (setf (aref buffer (+ start total-copied)) ,in-expr)
1501 (setf (buffer-head ibuf) head)
1502 (when decode-break-reason
1503 ;; If we've already read some characters on when the invalid
1504 ;; code sequence is detected, we return immediately. The
1505 ;; handling of the error is deferred until the next call
1506 ;; (where this check will be false). This allows establishing
1507 ;; high-level handlers for decode errors (for example
1508 ;; automatically resyncing in Lisp comments).
1509 (when (plusp total-copied)
1510 (return-from ,in-function total-copied))
1511 (when (stream-decoding-error-and-handle
1512 stream decode-break-reason)
1514 (error 'end-of-file :stream stream)
1515 (return-from ,in-function total-copied)))
1516 (setf head (buffer-head ibuf))
1517 (setf tail (buffer-tail ibuf))))
1518 (setf (buffer-head ibuf) head)
1519 ;; Maybe we need to refill the stream buffer.
1520 (cond ( ;; If there were enough data in the stream buffer, we're done.
1521 (= total-copied requested)
1522 (return total-copied))
1523 ( ;; If EOF, we're done in another way.
1524 (or (eq decode-break-reason 'eof)
1525 (null (catch 'eof-input-catcher
1526 (refill-input-buffer stream))))
1528 (error 'end-of-file :stream stream)
1529 (return total-copied)))
1530 ;; Otherwise we refilled the stream buffer, so fall
1531 ;; through into another pass of the loop.
1533 (def-input-routine/variable-width ,in-char-function (character
1537 (let ((byte (sap-ref-8 sap head)))
1538 (declare (ignorable byte))
1540 (defun ,resync-function (stream)
1541 (let ((ibuf (fd-stream-ibuf stream)))
1543 (input-at-least stream 2)
1544 (incf (buffer-head ibuf))
1545 (unless (block decode-break-reason
1546 (let* ((sap (buffer-sap ibuf))
1547 (head (buffer-head ibuf))
1548 (byte (sap-ref-8 sap head))
1549 (size ,in-size-expr))
1550 (declare (ignorable byte))
1551 (input-at-least stream size)
1552 (setf head (buffer-head ibuf))
1556 (defun ,read-c-string-function (sap element-type)
1557 (declare (type system-area-pointer sap))
1559 (declare (optimize (speed 3) (safety 0)))
1560 (let* ((stream ,name)
1561 (size 0) (head 0) (byte 0) (char nil)
1562 (decode-break-reason nil)
1563 (length (dotimes (count (1- ARRAY-DIMENSION-LIMIT) count)
1564 (setf decode-break-reason
1565 (block decode-break-reason
1566 (setf byte (sap-ref-8 sap head)
1571 (when decode-break-reason
1572 (c-string-decoding-error ,name decode-break-reason))
1573 (when (zerop (char-code char))
1575 (string (make-string length :element-type element-type)))
1576 (declare (ignorable stream)
1577 (type index head length) ;; size
1578 (type (unsigned-byte 8) byte)
1579 (type (or null character) char)
1580 (type string string))
1582 (dotimes (index length string)
1583 (setf decode-break-reason
1584 (block decode-break-reason
1585 (setf byte (sap-ref-8 sap head)
1590 (when decode-break-reason
1591 (c-string-decoding-error ,name decode-break-reason))
1592 (setf (aref string index) char)))))
1594 (defun ,output-c-string-function (string)
1595 (declare (type simple-string string))
1597 (declare (optimize (speed 3) (safety 0)))
1598 (let* ((length (length string))
1599 (char-length (make-array (1+ length) :element-type 'index))
1601 (+ (loop for i of-type index below length
1602 for byte of-type character = (aref string i)
1603 for bits = (char-code byte)
1604 sum (setf (aref char-length i)
1605 (the index ,out-size-expr)))
1606 (let* ((byte (code-char 0))
1607 (bits (char-code byte)))
1608 (declare (ignorable byte bits))
1609 (setf (aref char-length length)
1610 (the index ,out-size-expr)))))
1612 (,n-buffer (make-array buffer-length
1613 :element-type '(unsigned-byte 8)))
1615 (declare (type index length buffer-length tail)
1618 (with-pinned-objects (,n-buffer)
1619 (let ((sap (vector-sap ,n-buffer)))
1620 (declare (system-area-pointer sap))
1621 (loop for i of-type index below length
1622 for byte of-type character = (aref string i)
1623 for bits = (char-code byte)
1624 for size of-type index = (aref char-length i)
1629 (byte (code-char bits))
1630 (size (aref char-length length)))
1631 (declare (ignorable bits byte size))
1635 (setf *external-formats*
1636 (cons '(,external-format ,in-function ,in-char-function ,out-function
1637 ,@(mapcar #'(lambda (buffering)
1638 (intern (format nil format (string buffering))))
1639 '(:none :line :full))
1641 ,size-function ,read-c-string-function ,output-c-string-function)
1642 *external-formats*)))))
1644 ;;; Multiple names for the :ISO{,-}8859-* families are needed because on
1645 ;;; FreeBSD (and maybe other BSD systems), nl_langinfo("LATIN-1") will
1646 ;;; return "ISO8859-1" instead of "ISO-8859-1".
1647 (define-external-format (:latin-1 :latin1 :iso-8859-1 :iso8859-1)
1650 (external-format-encoding-error stream bits)
1651 (setf (sap-ref-8 sap tail) bits))
1654 (define-external-format (:ascii :us-ascii :ansi_x3.4-1968
1655 :iso-646 :iso-646-us :|646|)
1658 (external-format-encoding-error stream bits)
1659 (setf (sap-ref-8 sap tail) bits))
1662 (let* ((table (let ((s (make-string 256)))
1663 (map-into s #'code-char
1664 '(#x00 #x01 #x02 #x03 #x9c #x09 #x86 #x7f #x97 #x8d #x8e #x0b #x0c #x0d #x0e #x0f
1665 #x10 #x11 #x12 #x13 #x9d #x85 #x08 #x87 #x18 #x19 #x92 #x8f #x1c #x1d #x1e #x1f
1666 #x80 #x81 #x82 #x83 #x84 #x0a #x17 #x1b #x88 #x89 #x8a #x8b #x8c #x05 #x06 #x07
1667 #x90 #x91 #x16 #x93 #x94 #x95 #x96 #x04 #x98 #x99 #x9a #x9b #x14 #x15 #x9e #x1a
1668 #x20 #xa0 #xe2 #xe4 #xe0 #xe1 #xe3 #xe5 #xe7 #xf1 #xa2 #x2e #x3c #x28 #x2b #x7c
1669 #x26 #xe9 #xea #xeb #xe8 #xed #xee #xef #xec #xdf #x21 #x24 #x2a #x29 #x3b #xac
1670 #x2d #x2f #xc2 #xc4 #xc0 #xc1 #xc3 #xc5 #xc7 #xd1 #xa6 #x2c #x25 #x5f #x3e #x3f
1671 #xf8 #xc9 #xca #xcb #xc8 #xcd #xce #xcf #xcc #x60 #x3a #x23 #x40 #x27 #x3d #x22
1672 #xd8 #x61 #x62 #x63 #x64 #x65 #x66 #x67 #x68 #x69 #xab #xbb #xf0 #xfd #xfe #xb1
1673 #xb0 #x6a #x6b #x6c #x6d #x6e #x6f #x70 #x71 #x72 #xaa #xba #xe6 #xb8 #xc6 #xa4
1674 #xb5 #x7e #x73 #x74 #x75 #x76 #x77 #x78 #x79 #x7a #xa1 #xbf #xd0 #xdd #xde #xae
1675 #x5e #xa3 #xa5 #xb7 #xa9 #xa7 #xb6 #xbc #xbd #xbe #x5b #x5d #xaf #xa8 #xb4 #xd7
1676 #x7b #x41 #x42 #x43 #x44 #x45 #x46 #x47 #x48 #x49 #xad #xf4 #xf6 #xf2 #xf3 #xf5
1677 #x7d #x4a #x4b #x4c #x4d #x4e #x4f #x50 #x51 #x52 #xb9 #xfb #xfc #xf9 #xfa #xff
1678 #x5c #xf7 #x53 #x54 #x55 #x56 #x57 #x58 #x59 #x5a #xb2 #xd4 #xd6 #xd2 #xd3 #xd5
1679 #x30 #x31 #x32 #x33 #x34 #x35 #x36 #x37 #x38 #x39 #xb3 #xdb #xdc #xd9 #xda #x9f))
1681 (reverse-table (let ((rt (make-array 256 :element-type '(unsigned-byte 8) :initial-element 0)))
1682 (loop for char across table for i from 0
1683 do (aver (= 0 (aref rt (char-code char))))
1684 do (setf (aref rt (char-code char)) i))
1686 (define-external-format (:ebcdic-us :ibm-037 :ibm037)
1689 (external-format-encoding-error stream bits)
1690 (setf (sap-ref-8 sap tail) (aref reverse-table bits)))
1695 (let ((latin-9-table (let ((table (make-string 256)))
1698 (setf (aref table i) (code-char i)))
1699 (setf (aref table #xa4) (code-char #x20ac))
1700 (setf (aref table #xa6) (code-char #x0160))
1701 (setf (aref table #xa8) (code-char #x0161))
1702 (setf (aref table #xb4) (code-char #x017d))
1703 (setf (aref table #xb8) (code-char #x017e))
1704 (setf (aref table #xbc) (code-char #x0152))
1705 (setf (aref table #xbd) (code-char #x0153))
1706 (setf (aref table #xbe) (code-char #x0178))
1708 (latin-9-reverse-1 (make-array 16
1709 :element-type '(unsigned-byte 21)
1710 :initial-contents '(#x0160 #x0161 #x0152 #x0153 0 0 0 0 #x0178 0 0 0 #x20ac #x017d #x017e 0)))
1711 (latin-9-reverse-2 (make-array 16
1712 :element-type '(unsigned-byte 8)
1713 :initial-contents '(#xa6 #xa8 #xbc #xbd 0 0 0 0 #xbe 0 0 0 #xa4 #xb4 #xb8 0))))
1714 (define-external-format (:latin-9 :latin9 :iso-8859-15 :iso8859-15)
1716 (setf (sap-ref-8 sap tail)
1718 (if (= bits (char-code (aref latin-9-table bits)))
1720 (external-format-encoding-error stream byte))
1721 (if (= (aref latin-9-reverse-1 (logand bits 15)) bits)
1722 (aref latin-9-reverse-2 (logand bits 15))
1723 (external-format-encoding-error stream byte))))
1724 (aref latin-9-table byte)))
1726 (define-external-format/variable-width (:utf-8 :utf8) nil
1727 (let ((bits (char-code byte)))
1728 (cond ((< bits #x80) 1)
1730 ((< bits #x10000) 3)
1733 (1 (setf (sap-ref-8 sap tail) bits))
1734 (2 (setf (sap-ref-8 sap tail) (logior #xc0 (ldb (byte 5 6) bits))
1735 (sap-ref-8 sap (+ 1 tail)) (logior #x80 (ldb (byte 6 0) bits))))
1736 (3 (setf (sap-ref-8 sap tail) (logior #xe0 (ldb (byte 4 12) bits))
1737 (sap-ref-8 sap (+ 1 tail)) (logior #x80 (ldb (byte 6 6) bits))
1738 (sap-ref-8 sap (+ 2 tail)) (logior #x80 (ldb (byte 6 0) bits))))
1739 (4 (setf (sap-ref-8 sap tail) (logior #xf0 (ldb (byte 3 18) bits))
1740 (sap-ref-8 sap (+ 1 tail)) (logior #x80 (ldb (byte 6 12) bits))
1741 (sap-ref-8 sap (+ 2 tail)) (logior #x80 (ldb (byte 6 6) bits))
1742 (sap-ref-8 sap (+ 3 tail)) (logior #x80 (ldb (byte 6 0) bits)))))
1743 (cond ((< byte #x80) 1)
1744 ((< byte #xc2) (return-from decode-break-reason 1))
1748 (code-char (ecase size
1750 (2 (let ((byte2 (sap-ref-8 sap (1+ head))))
1751 (unless (<= #x80 byte2 #xbf)
1752 (return-from decode-break-reason 2))
1753 (dpb byte (byte 5 6) byte2)))
1754 (3 (let ((byte2 (sap-ref-8 sap (1+ head)))
1755 (byte3 (sap-ref-8 sap (+ 2 head))))
1756 (unless (and (<= #x80 byte2 #xbf)
1757 (<= #x80 byte3 #xbf))
1758 (return-from decode-break-reason 3))
1759 (dpb byte (byte 4 12) (dpb byte2 (byte 6 6) byte3))))
1760 (4 (let ((byte2 (sap-ref-8 sap (1+ head)))
1761 (byte3 (sap-ref-8 sap (+ 2 head)))
1762 (byte4 (sap-ref-8 sap (+ 3 head))))
1763 (unless (and (<= #x80 byte2 #xbf)
1764 (<= #x80 byte3 #xbf)
1765 (<= #x80 byte4 #xbf))
1766 (return-from decode-break-reason 4))
1767 (dpb byte (byte 3 18)
1768 (dpb byte2 (byte 6 12)
1769 (dpb byte3 (byte 6 6) byte4))))))))
1771 ;;;; utility functions (misc routines, etc)
1773 ;;; Fill in the various routine slots for the given type. INPUT-P and
1774 ;;; OUTPUT-P indicate what slots to fill. The buffering slot must be
1775 ;;; set prior to calling this routine.
1776 (defun set-fd-stream-routines (fd-stream element-type external-format
1777 input-p output-p buffer-p)
1778 (let* ((target-type (case element-type
1779 (unsigned-byte '(unsigned-byte 8))
1780 (signed-byte '(signed-byte 8))
1781 (:default 'character)
1783 (character-stream-p (subtypep target-type 'character))
1784 (bivalent-stream-p (eq element-type :default))
1785 normalized-external-format
1786 (bin-routine #'ill-bin)
1789 (cin-routine #'ill-in)
1792 (input-type nil) ;calculated from bin-type/cin-type
1793 (input-size nil) ;calculated from bin-size/cin-size
1794 (read-n-characters #'ill-in)
1795 (bout-routine #'ill-bout)
1798 (cout-routine #'ill-out)
1803 (output-bytes #'ill-bout))
1805 ;; Ensure that we have buffers in the desired direction(s) only,
1806 ;; getting new ones and dropping/resetting old ones as necessary.
1807 (let ((obuf (fd-stream-obuf fd-stream)))
1811 (setf (fd-stream-obuf fd-stream) (get-buffer)))
1813 (setf (fd-stream-obuf fd-stream) nil)
1814 (release-buffer obuf))))
1816 (let ((ibuf (fd-stream-ibuf fd-stream)))
1820 (setf (fd-stream-ibuf fd-stream) (get-buffer)))
1822 (setf (fd-stream-ibuf fd-stream) nil)
1823 (release-buffer ibuf))))
1825 ;; FIXME: Why only for output? Why unconditionally?
1827 (setf (fd-stream-char-pos fd-stream) 0))
1829 (when (and character-stream-p
1830 (eq external-format :default))
1831 (/show0 "/getting default external format")
1832 (setf external-format (default-external-format)))
1835 (when (or (not character-stream-p) bivalent-stream-p)
1836 (multiple-value-setq (bin-routine bin-type bin-size read-n-characters
1837 normalized-external-format)
1838 (pick-input-routine (if bivalent-stream-p '(unsigned-byte 8)
1842 (error "could not find any input routine for ~S" target-type)))
1843 (when character-stream-p
1844 (multiple-value-setq (cin-routine cin-type cin-size read-n-characters
1845 normalized-external-format)
1846 (pick-input-routine target-type external-format))
1848 (error "could not find any input routine for ~S" target-type)))
1849 (setf (fd-stream-in fd-stream) cin-routine
1850 (fd-stream-bin fd-stream) bin-routine)
1851 ;; character type gets preferential treatment
1852 (setf input-size (or cin-size bin-size))
1853 (setf input-type (or cin-type bin-type))
1854 (when normalized-external-format
1855 (setf (fd-stream-external-format fd-stream)
1856 normalized-external-format))
1857 (when (= (or cin-size 1) (or bin-size 1) 1)
1858 (setf (fd-stream-n-bin fd-stream) ;XXX
1859 (if (and character-stream-p (not bivalent-stream-p))
1861 #'fd-stream-read-n-bytes))
1862 ;; Sometimes turn on fast-read-char/fast-read-byte. Switch on
1863 ;; for character and (unsigned-byte 8) streams. In these
1864 ;; cases, fast-read-* will read from the
1865 ;; ansi-stream-(c)in-buffer, saving function calls.
1866 ;; Otherwise, the various data-reading functions in the stream
1867 ;; structure will be called.
1869 (not bivalent-stream-p)
1870 ;; temporary disable on :io streams
1872 (cond (character-stream-p
1873 (setf (ansi-stream-cin-buffer fd-stream)
1874 (make-array +ansi-stream-in-buffer-length+
1875 :element-type 'character)))
1876 ((equal target-type '(unsigned-byte 8))
1877 (setf (ansi-stream-in-buffer fd-stream)
1878 (make-array +ansi-stream-in-buffer-length+
1879 :element-type '(unsigned-byte 8))))))))
1882 (when (or (not character-stream-p) bivalent-stream-p)
1883 (multiple-value-setq (bout-routine bout-type bout-size output-bytes
1884 normalized-external-format)
1885 (pick-output-routine (if bivalent-stream-p
1888 (fd-stream-buffering fd-stream)
1890 (unless bout-routine
1891 (error "could not find any output routine for ~S buffered ~S"
1892 (fd-stream-buffering fd-stream)
1894 (when character-stream-p
1895 (multiple-value-setq (cout-routine cout-type cout-size output-bytes
1896 normalized-external-format)
1897 (pick-output-routine target-type
1898 (fd-stream-buffering fd-stream)
1900 (unless cout-routine
1901 (error "could not find any output routine for ~S buffered ~S"
1902 (fd-stream-buffering fd-stream)
1904 (when normalized-external-format
1905 (setf (fd-stream-external-format fd-stream)
1906 normalized-external-format))
1907 (when character-stream-p
1908 (setf (fd-stream-output-bytes fd-stream) output-bytes))
1909 (setf (fd-stream-out fd-stream) cout-routine
1910 (fd-stream-bout fd-stream) bout-routine
1911 (fd-stream-sout fd-stream) (if (eql cout-size 1)
1912 #'fd-sout #'ill-out))
1913 (setf output-size (or cout-size bout-size))
1914 (setf output-type (or cout-type bout-type)))
1916 (when (and input-size output-size
1917 (not (eq input-size output-size)))
1918 (error "Element sizes for input (~S:~S) and output (~S:~S) differ?"
1919 input-type input-size
1920 output-type output-size))
1921 (setf (fd-stream-element-size fd-stream)
1922 (or input-size output-size))
1924 (setf (fd-stream-element-type fd-stream)
1925 (cond ((equal input-type output-type)
1931 ((subtypep input-type output-type)
1933 ((subtypep output-type input-type)
1936 (error "Input type (~S) and output type (~S) are unrelated?"
1940 ;;; Handles the resource-release aspects of stream closing.
1941 (defun release-fd-stream-resources (fd-stream)
1944 ;; Disable interrupts so that a asynch unwind will not leave
1945 ;; us with a dangling finalizer (that would close the same
1946 ;; --possibly reassigned-- FD again).
1947 (sb!unix:unix-close (fd-stream-fd fd-stream))
1948 (when (fboundp 'cancel-finalization)
1949 (cancel-finalization fd-stream)))
1950 ;; On error unwind from WITHOUT-INTERRUPTS.
1951 (serious-condition (e)
1954 ;; Release all buffers. If this is undone, or interrupted,
1955 ;; we're still safe: buffers have finalizers of their own.
1956 (release-fd-stream-buffers fd-stream))
1958 ;;; Flushes the current input buffer and unread chatacter, and returns
1959 ;;; the input buffer, and the amount of of flushed input in bytes.
1960 (defun flush-input-buffer (stream)
1961 (let ((unread (if (fd-stream-unread stream)
1964 (setf (fd-stream-unread stream) nil)
1965 (let ((ibuf (fd-stream-ibuf stream)))
1967 (let ((head (buffer-head ibuf))
1968 (tail (buffer-tail ibuf)))
1969 (values (reset-buffer ibuf) (- (+ unread tail) head)))
1970 (values nil unread)))))
1972 (defun fd-stream-clear-input (stream)
1973 (flush-input-buffer stream)
1976 (sb!win32:fd-clear-input (fd-stream-fd stream))
1977 (setf (fd-stream-listen stream) nil))
1979 (catch 'eof-input-catcher
1980 (loop until (sysread-may-block-p stream)
1982 (refill-input-buffer stream)
1983 (reset-buffer (fd-stream-ibuf stream)))
1986 ;;; Handle miscellaneous operations on FD-STREAM.
1987 (defun fd-stream-misc-routine (fd-stream operation &optional arg1 arg2)
1988 (declare (ignore arg2))
1991 (labels ((do-listen ()
1992 (let ((ibuf (fd-stream-ibuf fd-stream)))
1993 (or (not (eql (buffer-head ibuf) (buffer-tail ibuf)))
1994 (fd-stream-listen fd-stream)
1996 (sb!win32:fd-listen (fd-stream-fd fd-stream))
1998 ;; If the read can block, LISTEN will certainly return NIL.
1999 (if (sysread-may-block-p fd-stream)
2001 ;; Otherwise select(2) and CL:LISTEN have slightly
2002 ;; different semantics. The former returns that an FD
2003 ;; is readable when a read operation wouldn't block.
2004 ;; That includes EOF. However, LISTEN must return NIL
2006 (progn (catch 'eof-input-catcher
2007 ;; r-b/f too calls select, but it shouldn't
2008 ;; block as long as read can return once w/o
2010 (refill-input-buffer fd-stream))
2011 ;; At this point either IBUF-HEAD != IBUF-TAIL
2012 ;; and FD-STREAM-LISTEN is NIL, in which case
2013 ;; we should return T, or IBUF-HEAD ==
2014 ;; IBUF-TAIL and FD-STREAM-LISTEN is :EOF, in
2015 ;; which case we should return :EOF for this
2016 ;; call and all future LISTEN call on this stream.
2017 ;; Call ourselves again to determine which case
2022 (setf (fd-stream-unread fd-stream) arg1)
2023 (setf (fd-stream-listen fd-stream) t))
2025 (cond (arg1 ; We got us an abort on our hands.
2026 (when (fd-stream-handler fd-stream)
2027 (remove-fd-handler (fd-stream-handler fd-stream))
2028 (setf (fd-stream-handler fd-stream) nil))
2029 ;; We can't do anything unless we know what file were
2030 ;; dealing with, and we don't want to do anything
2031 ;; strange unless we were writing to the file.
2032 (when (and (fd-stream-file fd-stream) (fd-stream-obuf fd-stream))
2033 (if (fd-stream-original fd-stream)
2034 ;; If the original is EQ to file we are appending
2035 ;; and can just close the file without renaming.
2036 (unless (eq (fd-stream-original fd-stream)
2037 (fd-stream-file fd-stream))
2038 ;; We have a handle on the original, just revert.
2039 (multiple-value-bind (okay err)
2040 (sb!unix:unix-rename (fd-stream-original fd-stream)
2041 (fd-stream-file fd-stream))
2043 (simple-stream-perror
2044 "couldn't restore ~S to its original contents"
2047 ;; We can't restore the original, and aren't
2048 ;; appending, so nuke that puppy.
2050 ;; FIXME: This is currently the fate of superseded
2051 ;; files, and according to the CLOSE spec this is
2052 ;; wrong. However, there seems to be no clean way to
2053 ;; do that that doesn't involve either copying the
2054 ;; data (bad if the :abort resulted from a full
2055 ;; disk), or renaming the old file temporarily
2056 ;; (probably bad because stream opening becomes more
2058 (multiple-value-bind (okay err)
2059 (sb!unix:unix-unlink (fd-stream-file fd-stream))
2061 (error 'simple-file-error
2062 :pathname (fd-stream-file fd-stream)
2064 "~@<couldn't remove ~S: ~2I~_~A~:>"
2065 :format-arguments (list (fd-stream-file fd-stream)
2066 (strerror err))))))))
2068 (finish-fd-stream-output fd-stream)
2069 (when (and (fd-stream-original fd-stream)
2070 (fd-stream-delete-original fd-stream))
2071 (multiple-value-bind (okay err)
2072 (sb!unix:unix-unlink (fd-stream-original fd-stream))
2074 (error 'simple-file-error
2075 :pathname (fd-stream-original fd-stream)
2077 "~@<couldn't delete ~S during close of ~S: ~
2080 (list (fd-stream-original fd-stream)
2082 (strerror err))))))))
2083 (release-fd-stream-resources fd-stream)
2084 ;; Mark as closed. FIXME: Maybe this should be the first thing done?
2085 (sb!impl::set-closed-flame fd-stream))
2087 (fd-stream-clear-input fd-stream))
2089 (flush-output-buffer fd-stream))
2091 (finish-fd-stream-output fd-stream))
2093 (fd-stream-element-type fd-stream))
2095 (fd-stream-external-format fd-stream))
2097 (= 1 (the (member 0 1)
2098 (sb!unix:unix-isatty (fd-stream-fd fd-stream)))))
2102 (fd-stream-char-pos fd-stream))
2104 (unless (fd-stream-file fd-stream)
2105 ;; This is a TYPE-ERROR because ANSI's species FILE-LENGTH
2106 ;; "should signal an error of type TYPE-ERROR if stream is not
2107 ;; a stream associated with a file". Too bad there's no very
2108 ;; appropriate value for the EXPECTED-TYPE slot..
2109 (error 'simple-type-error
2111 :expected-type 'fd-stream
2112 :format-control "~S is not a stream associated with a file."
2113 :format-arguments (list fd-stream)))
2114 (multiple-value-bind (okay dev ino mode nlink uid gid rdev size
2115 atime mtime ctime blksize blocks)
2116 (sb!unix:unix-fstat (fd-stream-fd fd-stream))
2117 (declare (ignore ino nlink uid gid rdev
2118 atime mtime ctime blksize blocks))
2120 (simple-stream-perror "failed Unix fstat(2) on ~S" fd-stream dev))
2123 (truncate size (fd-stream-element-size fd-stream)))))
2124 (:file-string-length
2126 (character (fd-stream-character-size fd-stream arg1))
2127 (string (fd-stream-string-size fd-stream arg1))))
2130 (fd-stream-set-file-position fd-stream arg1)
2131 (fd-stream-get-file-position fd-stream)))))
2133 ;; FIXME: Think about this.
2135 ;; (defun finish-fd-stream-output (fd-stream)
2136 ;; (let ((timeout (fd-stream-timeout fd-stream)))
2137 ;; (loop while (fd-stream-output-queue fd-stream)
2138 ;; ;; FIXME: SIGINT while waiting for a timeout will
2139 ;; ;; cause a timeout here.
2140 ;; do (when (and (not (serve-event timeout)) timeout)
2141 ;; (signal-timeout 'io-timeout
2142 ;; :stream fd-stream
2143 ;; :direction :write
2144 ;; :seconds timeout)))))
2146 (defun finish-fd-stream-output (stream)
2147 (flush-output-buffer stream)
2149 ((null (fd-stream-output-queue stream)))
2150 (serve-all-events)))
2152 (defun fd-stream-get-file-position (stream)
2153 (declare (fd-stream stream))
2155 (let ((posn (sb!unix:unix-lseek (fd-stream-fd stream) 0 sb!unix:l_incr)))
2156 (declare (type (or (alien sb!unix:off-t) null) posn))
2157 ;; We used to return NIL for errno==ESPIPE, and signal an error
2158 ;; in other failure cases. However, CLHS says to return NIL if
2159 ;; the position cannot be determined -- so that's what we do.
2160 (when (integerp posn)
2161 ;; Adjust for buffered output: If there is any output
2162 ;; buffered, the *real* file position will be larger
2163 ;; than reported by lseek() because lseek() obviously
2164 ;; cannot take into account output we have not sent
2166 (dolist (buffer (fd-stream-output-queue stream))
2167 (incf posn (- (buffer-tail buffer) (buffer-head buffer))))
2168 (let ((obuf (fd-stream-obuf stream)))
2170 (incf posn (buffer-tail obuf))))
2171 ;; Adjust for unread input: If there is any input
2172 ;; read from UNIX but not supplied to the user of the
2173 ;; stream, the *real* file position will smaller than
2174 ;; reported, because we want to look like the unread
2175 ;; stuff is still available.
2176 (let ((ibuf (fd-stream-ibuf stream)))
2178 (decf posn (- (buffer-tail ibuf) (buffer-head ibuf)))))
2179 (when (fd-stream-unread stream)
2181 ;; Divide bytes by element size.
2182 (truncate posn (fd-stream-element-size stream))))))
2184 (defun fd-stream-set-file-position (stream position-spec)
2185 (declare (fd-stream stream))
2186 (check-type position-spec
2187 (or (alien sb!unix:off-t) (member nil :start :end))
2188 "valid file position designator")
2191 ;; Make sure we don't have any output pending, because if we
2192 ;; move the file pointer before writing this stuff, it will be
2193 ;; written in the wrong location.
2194 (finish-fd-stream-output stream)
2195 ;; Disable interrupts so that interrupt handlers doing output
2198 (unless (fd-stream-output-finished-p stream)
2199 ;; We got interrupted and more output came our way during
2200 ;; the interrupt. Wrapping the FINISH-FD-STREAM-OUTPUT in
2201 ;; WITHOUT-INTERRUPTS gets nasty as it can signal errors,
2202 ;; so we prefer to do things like this...
2204 ;; Clear out any pending input to force the next read to go to
2206 (flush-input-buffer stream)
2207 ;; Trash cached value for listen, so that we check next time.
2208 (setf (fd-stream-listen stream) nil)
2210 (multiple-value-bind (offset origin)
2213 (values 0 sb!unix:l_set))
2215 (values 0 sb!unix:l_xtnd))
2217 (values (* position-spec (fd-stream-element-size stream))
2219 (declare (type (alien sb!unix:off-t) offset))
2220 (let ((posn (sb!unix:unix-lseek (fd-stream-fd stream)
2222 ;; CLHS says to return true if the file-position was set
2223 ;; succesfully, and NIL otherwise. We are to signal an error
2224 ;; only if the given position was out of bounds, and that is
2225 ;; dealt with above. In times past we used to return NIL for
2226 ;; errno==ESPIPE, and signal an error in other cases.
2228 ;; FIXME: We are still liable to signal an error if flushing
2230 (return-from fd-stream-set-file-position
2231 (typep posn '(alien sb!unix:off-t))))))))
2234 ;;;; creation routines (MAKE-FD-STREAM and OPEN)
2236 ;;; Create a stream for the given Unix file descriptor.
2238 ;;; If INPUT is non-NIL, allow input operations. If OUTPUT is non-nil,
2239 ;;; allow output operations. If neither INPUT nor OUTPUT is specified,
2240 ;;; default to allowing input.
2242 ;;; ELEMENT-TYPE indicates the element type to use (as for OPEN).
2244 ;;; BUFFERING indicates the kind of buffering to use.
2246 ;;; TIMEOUT (if true) is the number of seconds to wait for input. If
2247 ;;; NIL (the default), then wait forever. When we time out, we signal
2250 ;;; FILE is the name of the file (will be returned by PATHNAME).
2252 ;;; NAME is used to identify the stream when printed.
2253 (defun make-fd-stream (fd
2256 (output nil output-p)
2257 (element-type 'base-char)
2259 (external-format :default)
2268 (format nil "file ~A" file)
2269 (format nil "descriptor ~W" fd)))
2271 (declare (type index fd) (type (or real null) timeout)
2272 (type (member :none :line :full) buffering))
2273 (cond ((not (or input-p output-p))
2275 ((not (or input output))
2276 (error "File descriptor must be opened either for input or output.")))
2277 (let ((stream (%make-fd-stream :fd fd
2281 :delete-original delete-original
2283 :buffering buffering
2284 :dual-channel-p dual-channel-p
2285 :external-format external-format
2288 (coerce timeout 'single-float)
2290 (set-fd-stream-routines stream element-type external-format
2291 input output input-buffer-p)
2292 (when (and auto-close (fboundp 'finalize))
2295 (sb!unix:unix-close fd)
2297 (format *terminal-io* "** closed file descriptor ~W **~%"
2302 ;;; Pick a name to use for the backup file for the :IF-EXISTS
2303 ;;; :RENAME-AND-DELETE and :RENAME options.
2304 (defun pick-backup-name (name)
2305 (declare (type simple-string name))
2306 (concatenate 'simple-string name ".bak"))
2308 ;;; Ensure that the given arg is one of the given list of valid
2309 ;;; things. Allow the user to fix any problems.
2310 (defun ensure-one-of (item list what)
2311 (unless (member item list)
2312 (error 'simple-type-error
2314 :expected-type `(member ,@list)
2315 :format-control "~@<~S is ~_invalid for ~S; ~_need one of~{ ~S~}~:>"
2316 :format-arguments (list item what list))))
2318 ;;; Rename NAMESTRING to ORIGINAL. First, check whether we have write
2319 ;;; access, since we don't want to trash unwritable files even if we
2320 ;;; technically can. We return true if we succeed in renaming.
2321 (defun rename-the-old-one (namestring original)
2322 (unless (sb!unix:unix-access namestring sb!unix:w_ok)
2323 (error "~@<The file ~2I~_~S ~I~_is not writable.~:>" namestring))
2324 (multiple-value-bind (okay err) (sb!unix:unix-rename namestring original)
2327 (error 'simple-file-error
2328 :pathname namestring
2330 "~@<couldn't rename ~2I~_~S ~I~_to ~2I~_~S: ~4I~_~A~:>"
2331 :format-arguments (list namestring original (strerror err))))))
2333 (defun open (filename
2336 (element-type 'base-char)
2337 (if-exists nil if-exists-given)
2338 (if-does-not-exist nil if-does-not-exist-given)
2339 (external-format :default)
2340 &aux ; Squelch assignment warning.
2341 (direction direction)
2342 (if-does-not-exist if-does-not-exist)
2343 (if-exists if-exists))
2345 "Return a stream which reads from or writes to FILENAME.
2347 :DIRECTION - one of :INPUT, :OUTPUT, :IO, or :PROBE
2348 :ELEMENT-TYPE - the type of object to read or write, default BASE-CHAR
2349 :IF-EXISTS - one of :ERROR, :NEW-VERSION, :RENAME, :RENAME-AND-DELETE,
2350 :OVERWRITE, :APPEND, :SUPERSEDE or NIL
2351 :IF-DOES-NOT-EXIST - one of :ERROR, :CREATE or NIL
2352 See the manual for details."
2354 ;; Calculate useful stuff.
2355 (multiple-value-bind (input output mask)
2357 (:input (values t nil sb!unix:o_rdonly))
2358 (:output (values nil t sb!unix:o_wronly))
2359 (:io (values t t sb!unix:o_rdwr))
2360 (:probe (values t nil sb!unix:o_rdonly)))
2361 (declare (type index mask))
2362 (let* ((pathname (merge-pathnames filename))
2364 (cond ((unix-namestring pathname input))
2365 ((and input (eq if-does-not-exist :create))
2366 (unix-namestring pathname nil))
2367 ((and (eq direction :io) (not if-does-not-exist-given))
2368 (unix-namestring pathname nil)))))
2369 ;; Process if-exists argument if we are doing any output.
2371 (unless if-exists-given
2373 (if (eq (pathname-version pathname) :newest)
2376 (ensure-one-of if-exists
2377 '(:error :new-version :rename
2378 :rename-and-delete :overwrite
2379 :append :supersede nil)
2382 ((:new-version :error nil)
2383 (setf mask (logior mask sb!unix:o_excl)))
2384 ((:rename :rename-and-delete)
2385 (setf mask (logior mask sb!unix:o_creat)))
2387 (setf mask (logior mask sb!unix:o_trunc)))
2389 (setf mask (logior mask sb!unix:o_append)))))
2391 (setf if-exists :ignore-this-arg)))
2393 (unless if-does-not-exist-given
2394 (setf if-does-not-exist
2395 (cond ((eq direction :input) :error)
2397 (member if-exists '(:overwrite :append)))
2399 ((eq direction :probe)
2403 (ensure-one-of if-does-not-exist
2404 '(:error :create nil)
2406 (if (eq if-does-not-exist :create)
2407 (setf mask (logior mask sb!unix:o_creat)))
2409 (let ((original (case if-exists
2410 ((:rename :rename-and-delete)
2411 (pick-backup-name namestring))
2412 ((:append :overwrite)
2413 ;; KLUDGE: Provent CLOSE from deleting
2414 ;; appending streams when called with :ABORT T
2416 (delete-original (eq if-exists :rename-and-delete))
2418 (when (and original (not (eq original namestring)))
2419 ;; We are doing a :RENAME or :RENAME-AND-DELETE. Determine
2420 ;; whether the file already exists, make sure the original
2421 ;; file is not a directory, and keep the mode.
2424 (multiple-value-bind (okay err/dev inode orig-mode)
2425 (sb!unix:unix-stat namestring)
2426 (declare (ignore inode)
2427 (type (or index null) orig-mode))
2430 (when (and output (= (logand orig-mode #o170000)
2432 (error 'simple-file-error
2433 :pathname namestring
2435 "can't open ~S for output: is a directory"
2436 :format-arguments (list namestring)))
2437 (setf mode (logand orig-mode #o777))
2439 ((eql err/dev sb!unix:enoent)
2442 (simple-file-perror "can't find ~S"
2446 (rename-the-old-one namestring original))
2448 (setf delete-original nil)
2449 ;; In order to use :SUPERSEDE instead, we have to make
2450 ;; sure SB!UNIX:O_CREAT corresponds to
2451 ;; IF-DOES-NOT-EXIST. SB!UNIX:O_CREAT was set before
2452 ;; because of IF-EXISTS being :RENAME.
2453 (unless (eq if-does-not-exist :create)
2455 (logior (logandc2 mask sb!unix:o_creat)
2457 (setf if-exists :supersede))))
2459 ;; Now we can try the actual Unix open(2).
2460 (multiple-value-bind (fd errno)
2462 (sb!unix:unix-open namestring mask mode)
2463 (values nil sb!unix:enoent))
2464 (labels ((open-error (format-control &rest format-arguments)
2465 (error 'simple-file-error
2467 :format-control format-control
2468 :format-arguments format-arguments))
2469 (vanilla-open-error ()
2470 (simple-file-perror "error opening ~S" pathname errno)))
2473 ((:input :output :io)
2477 :element-type element-type
2478 :external-format external-format
2481 :delete-original delete-original
2488 (%make-fd-stream :name namestring
2491 :element-type element-type)))
2494 ((eql errno sb!unix:enoent)
2495 (case if-does-not-exist
2496 (:error (vanilla-open-error))
2498 (open-error "~@<The path ~2I~_~S ~I~_does not exist.~:>"
2501 ((and (eql errno sb!unix:eexist) (null if-exists))
2504 (vanilla-open-error)))))))))
2508 ;;; the stream connected to the controlling terminal, or NIL if there is none
2511 ;;; the stream connected to the standard input (file descriptor 0)
2514 ;;; the stream connected to the standard output (file descriptor 1)
2517 ;;; the stream connected to the standard error output (file descriptor 2)
2520 ;;; This is called when the cold load is first started up, and may also
2521 ;;; be called in an attempt to recover from nested errors.
2522 (defun stream-cold-init-or-reset ()
2524 (setf *terminal-io* (make-synonym-stream '*tty*))
2525 (setf *standard-output* (make-synonym-stream '*stdout*))
2526 (setf *standard-input* (make-synonym-stream '*stdin*))
2527 (setf *error-output* (make-synonym-stream '*stderr*))
2528 (setf *query-io* (make-synonym-stream '*terminal-io*))
2529 (setf *debug-io* *query-io*)
2530 (setf *trace-output* *standard-output*)
2533 (defun stream-deinit ()
2534 ;; Unbind to make sure we're not accidently dealing with it
2535 ;; before we're ready (or after we think it's been deinitialized).
2536 (with-available-buffers-lock ()
2537 (without-package-locks
2538 (makunbound '*available-buffers*))))
2540 ;;; This is called whenever a saved core is restarted.
2541 (defun stream-reinit (&optional init-buffers-p)
2542 (when init-buffers-p
2543 (with-available-buffers-lock ()
2544 (aver (not (boundp '*available-buffers*)))
2545 (setf *available-buffers* nil)))
2546 (with-output-to-string (*error-output*)
2548 (make-fd-stream 0 :name "standard input" :input t :buffering :line
2549 #!+win32 :external-format #!+win32 (sb!win32::console-input-codepage)))
2551 (make-fd-stream 1 :name "standard output" :output t :buffering :line
2552 #!+win32 :external-format #!+win32 (sb!win32::console-output-codepage)))
2554 (make-fd-stream 2 :name "standard error" :output t :buffering :line
2555 #!+win32 :external-format #!+win32 (sb!win32::console-output-codepage)))
2556 (let* ((ttyname #.(coerce "/dev/tty" 'simple-base-string))
2557 (tty (sb!unix:unix-open ttyname sb!unix:o_rdwr #o666)))
2561 :name "the terminal"
2566 (setf *tty* (make-two-way-stream *stdin* *stdout*))))
2567 (princ (get-output-stream-string *error-output*) *stderr*))
2572 ;;; the Unix way to beep
2573 (defun beep (stream)
2574 (write-char (code-char bell-char-code) stream)
2575 (finish-output stream))
2577 ;;; This is kind of like FILE-POSITION, but is an internal hack used
2578 ;;; by the filesys stuff to get and set the file name.
2580 ;;; FIXME: misleading name, screwy interface
2581 (defun file-name (stream &optional new-name)
2582 (when (typep stream 'fd-stream)
2584 (setf (fd-stream-pathname stream) new-name)
2585 (setf (fd-stream-file stream)
2586 (unix-namestring new-name nil))
2589 (fd-stream-pathname stream)))))