1 ;;;; os-independent stream functions
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 ;;; The initialization of these streams is performed by
17 ;;; STREAM-COLD-INIT-OR-RESET.
18 (defvar *terminal-io* () #!+sb-doc "terminal I/O stream")
19 (defvar *standard-input* () #!+sb-doc "default input stream")
20 (defvar *standard-output* () #!+sb-doc "default output stream")
21 (defvar *error-output* () #!+sb-doc "error output stream")
22 (defvar *query-io* () #!+sb-doc "query I/O stream")
23 (defvar *trace-output* () #!+sb-doc "trace output stream")
24 (defvar *debug-io* () #!+sb-doc "interactive debugging stream")
26 (defun ill-in (stream &rest ignore)
27 (declare (ignore ignore))
28 (error 'simple-type-error
30 :expected-type '(satisfies input-stream-p)
31 :format-control "~S is not a character input stream."
32 :format-arguments (list stream)))
33 (defun ill-out (stream &rest ignore)
34 (declare (ignore ignore))
35 (error 'simple-type-error
37 :expected-type '(satisfies output-stream-p)
38 :format-control "~S is not a character output stream."
39 :format-arguments (list stream)))
40 (defun ill-bin (stream &rest ignore)
41 (declare (ignore ignore))
42 (error 'simple-type-error
44 :expected-type '(satisfies input-stream-p)
45 :format-control "~S is not a binary input stream."
46 :format-arguments (list stream)))
47 (defun ill-bout (stream &rest ignore)
48 (declare (ignore ignore))
49 (error 'simple-type-error
51 :expected-type '(satisfies output-stream-p)
52 :format-control "~S is not a binary output stream."
53 :format-arguments (list stream)))
54 (defun closed-flame (stream &rest ignore)
55 (declare (ignore ignore))
56 (error "~S is closed." stream))
57 (defun no-op-placeholder (&rest ignore)
58 (declare (ignore ignore)))
60 ;;; stream manipulation functions
62 (declaim (inline ansi-stream-input-stream-p))
63 (defun ansi-stream-input-stream-p (stream)
64 (declare (type ansi-stream stream))
66 (when (synonym-stream-p stream)
68 (symbol-value (synonym-stream-symbol stream))))
70 (and (not (eq (ansi-stream-in stream) #'closed-flame))
71 ;;; KLUDGE: It's probably not good to have EQ tests on function
72 ;;; values like this. What if someone's redefined the function?
73 ;;; Is there a better way? (Perhaps just VALID-FOR-INPUT and
74 ;;; VALID-FOR-OUTPUT flags? -- WHN 19990902
75 (or (not (eq (ansi-stream-in stream) #'ill-in))
76 (not (eq (ansi-stream-bin stream) #'ill-bin)))))
78 (defun input-stream-p (stream)
79 (declare (type stream stream))
80 (and (ansi-stream-p stream)
81 (ansi-stream-input-stream-p stream)))
83 (declaim (inline ansi-stream-output-stream-p))
84 (defun ansi-stream-output-stream-p (stream)
85 (declare (type ansi-stream stream))
87 (when (synonym-stream-p stream)
88 (setf stream (symbol-value
89 (synonym-stream-symbol stream))))
91 (and (not (eq (ansi-stream-in stream) #'closed-flame))
92 (or (not (eq (ansi-stream-out stream) #'ill-out))
93 (not (eq (ansi-stream-bout stream) #'ill-bout)))))
95 (defun output-stream-p (stream)
96 (declare (type stream stream))
98 (and (ansi-stream-p stream)
99 (ansi-stream-output-stream-p stream)))
101 (declaim (inline ansi-stream-open-stream-p))
102 (defun ansi-stream-open-stream-p (stream)
103 (declare (type ansi-stream stream))
104 ;; CLHS 22.1.4 lets us not worry about synonym streams here.
105 (not (eq (ansi-stream-in stream) #'closed-flame)))
107 (defun open-stream-p (stream)
108 (ansi-stream-open-stream-p stream))
110 (declaim (inline ansi-stream-element-type))
111 (defun ansi-stream-element-type (stream)
112 (declare (type ansi-stream stream))
113 (funcall (ansi-stream-misc stream) stream :element-type))
115 (defun stream-element-type (stream)
116 (ansi-stream-element-type stream))
118 (defun stream-external-format (stream)
119 (funcall (ansi-stream-misc stream) stream :external-format))
121 (defun interactive-stream-p (stream)
122 (declare (type stream stream))
123 (funcall (ansi-stream-misc stream) stream :interactive-p))
125 (declaim (inline ansi-stream-close))
126 (defun ansi-stream-close (stream abort)
127 (declare (type ansi-stream stream))
128 (when (open-stream-p stream)
129 (funcall (ansi-stream-misc stream) stream :close abort))
132 (defun close (stream &key abort)
133 (ansi-stream-close stream abort))
135 (defun set-closed-flame (stream)
136 (setf (ansi-stream-in stream) #'closed-flame)
137 (setf (ansi-stream-bin stream) #'closed-flame)
138 (setf (ansi-stream-n-bin stream) #'closed-flame)
139 (setf (ansi-stream-in stream) #'closed-flame)
140 (setf (ansi-stream-out stream) #'closed-flame)
141 (setf (ansi-stream-bout stream) #'closed-flame)
142 (setf (ansi-stream-sout stream) #'closed-flame)
143 (setf (ansi-stream-misc stream) #'closed-flame))
145 ;;;; file position and file length
147 ;;; Call the MISC method with the :FILE-POSITION operation.
148 #!-sb-fluid (declaim (inline ansi-stream-file-position))
149 (defun ansi-stream-file-position (stream position)
150 (declare (type stream stream))
151 (declare (type (or index (alien sb!unix:off-t) (member nil :start :end))
153 ;; FIXME: It woud be good to comment on the stuff that is done here...
154 ;; FIXME: This doesn't look interrupt safe.
157 (setf (ansi-stream-in-index stream) +ansi-stream-in-buffer-length+)
158 (funcall (ansi-stream-misc stream) stream :file-position position))
160 (let ((res (funcall (ansi-stream-misc stream) stream :file-position nil)))
164 (- +ansi-stream-in-buffer-length+
165 (ansi-stream-in-index stream)))
167 (let* ((external-format (stream-external-format stream))
168 (ef-entry (find-external-format external-format))
169 (variable-width-p (variable-width-external-format-p ef-entry))
170 (char-len (bytes-for-char-fun ef-entry)))
173 (loop with buffer = (ansi-stream-cin-buffer stream)
174 with start = (ansi-stream-in-index stream)
175 for i from start below +ansi-stream-in-buffer-length+
176 sum (funcall char-len (aref buffer i)))
177 (* (funcall char-len #\x) ; arbitrary argument
178 (- +ansi-stream-in-buffer-length+
179 (ansi-stream-in-index stream)))))))))))
181 (defun file-position (stream &optional position)
182 (if (ansi-stream-p stream)
183 (ansi-stream-file-position stream position)
184 (stream-file-position stream position)))
186 ;;; This is a literal translation of the ANSI glossary entry "stream
187 ;;; associated with a file".
189 ;;; KLUDGE: Note that since Unix famously thinks "everything is a
190 ;;; file", and in particular stdin, stdout, and stderr are files, we
191 ;;; end up with this test being satisfied for weird things like
192 ;;; *STANDARD-OUTPUT* (to a tty). That seems unlikely to be what the
193 ;;; ANSI spec really had in mind, especially since this is used as a
194 ;;; qualification for operations like FILE-LENGTH (so that ANSI was
195 ;;; probably thinking of something like what Unix calls block devices)
196 ;;; but I can't see any better way to do it. -- WHN 2001-04-14
197 (defun stream-associated-with-file-p (x)
198 "Test for the ANSI concept \"stream associated with a file\"."
199 (or (typep x 'file-stream)
200 (and (synonym-stream-p x)
201 (stream-associated-with-file-p (symbol-value
202 (synonym-stream-symbol x))))))
204 (defun stream-must-be-associated-with-file (stream)
205 (declare (type stream stream))
206 (unless (stream-associated-with-file-p stream)
207 (error 'simple-type-error
208 ;; KLUDGE: The ANSI spec for FILE-LENGTH specifically says
209 ;; this should be TYPE-ERROR. But what then can we use for
210 ;; EXPECTED-TYPE? This SATISFIES type (with a nonstandard
211 ;; private predicate function..) is ugly and confusing, but
212 ;; I can't see any other way. -- WHN 2001-04-14
214 :expected-type '(satisfies stream-associated-with-file-p)
216 "~@<The stream ~2I~_~S ~I~_isn't associated with a file.~:>"
217 :format-arguments (list stream))))
219 ;;; like FILE-POSITION, only using :FILE-LENGTH
220 (defun file-length (stream)
221 ;; FIXME: The following declaration uses yet undefined types, which
222 ;; cause cross-compiler hangup.
224 ;; (declare (type (or file-stream synonym-stream) stream))
226 ;; The description for FILE-LENGTH says that an error must be raised
227 ;; for streams not associated with files (which broadcast streams
228 ;; aren't according to the glossary). However, the behaviour of
229 ;; FILE-LENGTH for broadcast streams is explicitly described in the
230 ;; BROADCAST-STREAM entry.
231 (unless (typep stream 'broadcast-stream)
232 (stream-must-be-associated-with-file stream))
233 (funcall (ansi-stream-misc stream) stream :file-length))
235 (defun file-string-length (stream object)
236 (funcall (ansi-stream-misc stream) stream :file-string-length object))
240 #!-sb-fluid (declaim (inline ansi-stream-read-line))
241 (defun ansi-stream-read-line (stream eof-error-p eof-value recursive-p)
242 (declare (ignore recursive-p))
243 (prepare-for-fast-read-char stream
244 ;; Check whether the FAST-READ-CHAR buffer contains a newline. If it
245 ;; does, we can do things quickly by just copying the line from the
246 ;; buffer instead of doing repeated calls to FAST-READ-CHAR.
249 ;; For %FIND-POSITION transform
250 (declare (optimize (speed 2)))
251 (let ((pos (position #\Newline %frc-buffer%
253 :start %frc-index%)))
255 (let* ((len (- pos %frc-index%))
256 (res (make-string len)))
257 (replace res %frc-buffer% :start2 %frc-index% :end2 pos)
258 (setf %frc-index% (1+ pos))
259 (done-with-fast-read-char)
260 (return-from ansi-stream-read-line res))))))
261 (let ((res (make-string 80))
265 (let ((ch (fast-read-char nil nil)))
267 (when (char= ch #\newline)
268 (done-with-fast-read-char)
269 (return (values (%shrink-vector res index) nil)))
272 (let ((new (make-string len)))
275 (setf (schar res index) ch)
278 (done-with-fast-read-char)
279 (return (values (eof-or-lose stream
283 ;; Since FAST-READ-CHAR already hit the eof char, we
284 ;; shouldn't do another READ-CHAR.
286 (done-with-fast-read-char)
287 (return (values (%shrink-vector res index) t)))))))))
289 (defun read-line (&optional (stream *standard-input*) (eof-error-p t) eof-value
291 (let ((stream (in-synonym-of stream)))
292 (if (ansi-stream-p stream)
293 (ansi-stream-read-line stream eof-error-p eof-value recursive-p)
294 ;; must be Gray streams FUNDAMENTAL-STREAM
295 (multiple-value-bind (string eof) (stream-read-line stream)
296 (if (and eof (zerop (length string)))
297 (values (eof-or-lose stream eof-error-p eof-value) t)
298 (values string eof))))))
300 ;;; We proclaim them INLINE here, then proclaim them NOTINLINE later on,
301 ;;; so, except in this file, they are not inline by default, but they can be.
302 #!-sb-fluid (declaim (inline read-char unread-char read-byte listen))
304 #!-sb-fluid (declaim (inline ansi-stream-read-char))
305 (defun ansi-stream-read-char (stream eof-error-p eof-value recursive-p)
306 (declare (ignore recursive-p))
307 (prepare-for-fast-read-char stream
309 (fast-read-char eof-error-p eof-value)
310 (done-with-fast-read-char))))
312 (defun read-char (&optional (stream *standard-input*)
316 (let ((stream (in-synonym-of stream)))
317 (if (ansi-stream-p stream)
318 (ansi-stream-read-char stream eof-error-p eof-value recursive-p)
319 ;; must be Gray streams FUNDAMENTAL-STREAM
320 (let ((char (stream-read-char stream)))
322 (eof-or-lose stream eof-error-p eof-value)
325 #!-sb-fluid (declaim (inline ansi-stream-unread-char))
326 (defun ansi-stream-unread-char (character stream)
327 (let ((index (1- (ansi-stream-in-index stream)))
328 (buffer (ansi-stream-cin-buffer stream)))
329 (declare (fixnum index))
330 (when (minusp index) (error "nothing to unread"))
332 (setf (aref buffer index) character)
333 (setf (ansi-stream-in-index stream) index))
335 (funcall (ansi-stream-misc stream) stream
336 :unread character)))))
338 (defun unread-char (character &optional (stream *standard-input*))
339 (let ((stream (in-synonym-of stream)))
340 (if (ansi-stream-p stream)
341 (ansi-stream-unread-char character stream)
342 ;; must be Gray streams FUNDAMENTAL-STREAM
343 (stream-unread-char stream character)))
346 #!-sb-fluid (declaim (inline ansi-stream-listen))
347 (defun ansi-stream-listen (stream)
348 (or (/= (the fixnum (ansi-stream-in-index stream))
349 +ansi-stream-in-buffer-length+)
350 ;; Handle :EOF return from misc methods specially
351 (let ((result (funcall (ansi-stream-misc stream) stream :listen)))
356 (defun listen (&optional (stream *standard-input*))
357 (let ((stream (in-synonym-of stream)))
358 (if (ansi-stream-p stream)
359 (ansi-stream-listen stream)
360 ;; Fall through to Gray streams FUNDAMENTAL-STREAM case.
361 (stream-listen stream))))
363 #!-sb-fluid (declaim (inline ansi-stream-read-char-no-hang))
364 (defun ansi-stream-read-char-no-hang (stream eof-error-p eof-value recursive-p)
365 (if (funcall (ansi-stream-misc stream) stream :listen)
366 ;; On T or :EOF get READ-CHAR to do the work.
367 (ansi-stream-read-char stream eof-error-p eof-value recursive-p)
370 (defun read-char-no-hang (&optional (stream *standard-input*)
374 (let ((stream (in-synonym-of stream)))
375 (if (ansi-stream-p stream)
376 (ansi-stream-read-char-no-hang stream eof-error-p eof-value
378 ;; must be Gray streams FUNDAMENTAL-STREAM
379 (let ((char (stream-read-char-no-hang stream)))
381 (eof-or-lose stream eof-error-p eof-value)
384 #!-sb-fluid (declaim (inline ansi-stream-clear-input))
385 (defun ansi-stream-clear-input (stream)
386 (setf (ansi-stream-in-index stream) +ansi-stream-in-buffer-length+)
387 (funcall (ansi-stream-misc stream) stream :clear-input))
389 (defun clear-input (&optional (stream *standard-input*))
390 (let ((stream (in-synonym-of stream)))
391 (if (ansi-stream-p stream)
392 (ansi-stream-clear-input stream)
393 ;; must be Gray streams FUNDAMENTAL-STREAM
394 (stream-clear-input stream)))
397 #!-sb-fluid (declaim (inline ansi-stream-read-byte))
398 (defun ansi-stream-read-byte (stream eof-error-p eof-value recursive-p)
399 ;; Why the "recursive-p" parameter? a-s-r-b is funcall'ed from
400 ;; a-s-read-sequence and needs a lambda list that's congruent with
401 ;; that of a-s-read-char
402 (declare (ignore recursive-p))
403 (prepare-for-fast-read-byte stream
405 (fast-read-byte eof-error-p eof-value t)
406 (done-with-fast-read-byte))))
408 (defun read-byte (stream &optional (eof-error-p t) eof-value)
409 (if (ansi-stream-p stream)
410 (ansi-stream-read-byte stream eof-error-p eof-value nil)
411 ;; must be Gray streams FUNDAMENTAL-STREAM
412 (let ((char (stream-read-byte stream)))
414 (eof-or-lose stream eof-error-p eof-value)
417 ;;; Read NUMBYTES bytes into BUFFER beginning at START, and return the
418 ;;; number of bytes read.
420 ;;; Note: CMU CL's version of this had a special interpretation of
421 ;;; EOF-ERROR-P which SBCL does not have. (In the EOF-ERROR-P=NIL
422 ;;; case, CMU CL's version would return as soon as any data became
423 ;;; available.) This could be useful behavior for things like pipes in
424 ;;; some cases, but it wasn't being used in SBCL, so it was dropped.
425 ;;; If we ever need it, it could be added later as a new variant N-BIN
426 ;;; method (perhaps N-BIN-ASAP?) or something.
427 (defun read-n-bytes (stream buffer start numbytes &optional (eof-error-p t))
428 (declare (type ansi-stream stream)
429 (type index numbytes start)
430 (type (or (simple-array * (*)) system-area-pointer) buffer))
431 (let* ((stream (in-synonym-of stream ansi-stream))
432 (in-buffer (ansi-stream-in-buffer stream))
433 (index (ansi-stream-in-index stream))
434 (num-buffered (- +ansi-stream-in-buffer-length+ index)))
435 (declare (fixnum index num-buffered))
438 (funcall (ansi-stream-n-bin stream)
444 ((<= numbytes num-buffered)
446 (let ((copy-function (typecase buffer
447 ((simple-array * (*)) #'ub8-bash-copy)
448 (system-area-pointer #'copy-ub8-to-system-area))))
449 (funcall copy-function in-buffer index buffer start numbytes))
450 (%byte-blt in-buffer index
451 buffer start (+ start numbytes))
452 (setf (ansi-stream-in-index stream) (+ index numbytes))
455 (let ((end (+ start num-buffered)))
457 (let ((copy-function (typecase buffer
458 ((simple-array * (*)) #'ub8-bash-copy)
459 (system-area-pointer #'copy-ub8-to-system-area))))
460 (funcall copy-function in-buffer index buffer start num-buffered))
461 (%byte-blt in-buffer index buffer start end)
462 (setf (ansi-stream-in-index stream) +ansi-stream-in-buffer-length+)
463 (+ (funcall (ansi-stream-n-bin stream)
467 (- numbytes num-buffered)
471 ;;; the amount of space we leave at the start of the in-buffer for
474 ;;; (It's 4 instead of 1 to allow word-aligned copies.)
475 (defconstant +ansi-stream-in-buffer-extra+
476 4) ; FIXME: should be symbolic constant
478 ;;; This function is called by the FAST-READ-CHAR expansion to refill
479 ;;; the IN-BUFFER for text streams. There is definitely an IN-BUFFER,
480 ;;; and hence must be an N-BIN method.
481 (defun fast-read-char-refill (stream eof-error-p eof-value)
482 (let* ((ibuf (ansi-stream-cin-buffer stream))
483 (count (funcall (ansi-stream-n-bin stream)
486 +ansi-stream-in-buffer-extra+
487 (- +ansi-stream-in-buffer-length+
488 +ansi-stream-in-buffer-extra+)
490 (start (- +ansi-stream-in-buffer-length+ count)))
491 (declare (type index start count))
493 (setf (ansi-stream-in-index stream)
494 +ansi-stream-in-buffer-length+)
495 (funcall (ansi-stream-in stream) stream eof-error-p eof-value))
497 (when (/= start +ansi-stream-in-buffer-extra+)
498 (#.(let* ((n-character-array-bits
501 sb!vm:*specialized-array-element-type-properties*
502 :key #'sb!vm:saetp-specifier)))
503 (bash-function (intern (format nil "UB~D-BASH-COPY" n-character-array-bits)
504 (find-package "SB!KERNEL"))))
506 ibuf +ansi-stream-in-buffer-extra+
509 (setf (ansi-stream-in-index stream) (1+ start))
510 (aref ibuf start)))))
512 ;;; This is similar to FAST-READ-CHAR-REFILL, but we don't have to
513 ;;; leave room for unreading.
514 (defun fast-read-byte-refill (stream eof-error-p eof-value)
515 (let* ((ibuf (ansi-stream-in-buffer stream))
516 (count (funcall (ansi-stream-n-bin stream) stream
517 ibuf 0 +ansi-stream-in-buffer-length+
519 (start (- +ansi-stream-in-buffer-length+ count)))
520 (declare (type index start count))
522 (setf (ansi-stream-in-index stream) +ansi-stream-in-buffer-length+)
523 (funcall (ansi-stream-bin stream) stream eof-error-p eof-value))
525 (unless (zerop start)
526 (ub8-bash-copy ibuf 0
529 (setf (ansi-stream-in-index stream) (1+ start))
530 (aref ibuf start)))))
534 (defun write-char (character &optional (stream *standard-output*))
535 (with-out-stream stream (ansi-stream-out character)
536 (stream-write-char character))
539 (defun terpri (&optional (stream *standard-output*))
540 (with-out-stream stream (ansi-stream-out #\newline) (stream-terpri))
543 #!-sb-fluid (declaim (inline ansi-stream-fresh-line))
544 (defun ansi-stream-fresh-line (stream)
545 (when (/= (or (charpos stream) 1) 0)
546 (funcall (ansi-stream-out stream) stream #\newline)
549 (defun fresh-line (&optional (stream *standard-output*))
550 (let ((stream (out-synonym-of stream)))
551 (if (ansi-stream-p stream)
552 (ansi-stream-fresh-line stream)
553 ;; must be Gray streams FUNDAMENTAL-STREAM
554 (stream-fresh-line stream))))
556 (defun write-string (string &optional (stream *standard-output*)
558 (declare (type string string))
559 ;; Note that even though you might expect, based on the behavior of
560 ;; things like AREF, that the correct upper bound here is
561 ;; (ARRAY-DIMENSION STRING 0), the ANSI glossary definitions for
562 ;; "bounding index" and "length" indicate that in this case (i.e.
563 ;; for the ANSI-specified functions WRITE-STRING [and WRITE-LINE]),
564 ;; (LENGTH STRING) is the required upper bound. A foolish
565 ;; consistency is the hobgoblin of lesser languages..
566 (%write-string string stream start (%check-vector-sequence-bounds
570 #!-sb-fluid (declaim (inline ansi-stream-write-string))
571 (defun ansi-stream-write-string (string stream start end)
572 (declare (type string string))
573 (declare (type ansi-stream stream))
574 (declare (type index start end))
575 (if (array-header-p string)
576 (with-array-data ((data string) (offset-start start)
578 (funcall (ansi-stream-sout stream)
579 stream data offset-start offset-end))
580 (funcall (ansi-stream-sout stream) stream string start end))
583 (defun %write-string (string stream start end)
584 (declare (type string string))
585 (declare (type stream-designator stream))
586 (declare (type index start end))
587 (let ((stream (out-synonym-of stream)))
588 (if(ansi-stream-p stream)
589 (ansi-stream-write-string string stream start end)
590 ;; must be Gray streams FUNDAMENTAL-STREAM
591 (stream-write-string stream string start end))))
593 ;;; A wrapper function for all those (MACROLET OUT-FUN) definitions,
594 ;;; which cannot deal with keyword arguments.
595 (declaim (inline write-string-no-key))
596 (defun write-string-no-key (string stream start end)
597 (write-string string stream :start start :end end))
599 (defun write-line (string &optional (stream *standard-output*)
601 (declare (type string string))
602 ;; FIXME: Why is there this difference between the treatments of the
603 ;; STREAM argument in WRITE-STRING and WRITE-LINE?
604 (let ((defaulted-stream (out-synonym-of stream)))
605 (%write-string string defaulted-stream start (%check-vector-sequence-bounds
607 (write-char #\newline defaulted-stream))
610 (defun charpos (&optional (stream *standard-output*))
611 (with-out-stream stream (ansi-stream-misc :charpos) (stream-line-column)))
613 (defun line-length (&optional (stream *standard-output*))
614 (with-out-stream stream (ansi-stream-misc :line-length)
615 (stream-line-length)))
617 (defun finish-output (&optional (stream *standard-output*))
618 (with-out-stream stream (ansi-stream-misc :finish-output)
619 (stream-finish-output))
622 (defun force-output (&optional (stream *standard-output*))
623 (with-out-stream stream (ansi-stream-misc :force-output)
624 (stream-force-output))
627 (defun clear-output (&optional (stream *standard-output*))
628 (with-out-stream stream (ansi-stream-misc :clear-output)
629 (stream-force-output))
632 (defun write-byte (integer stream)
633 (with-out-stream/no-synonym stream (ansi-stream-bout integer)
634 (stream-write-byte integer))
638 ;;; (These were inline throughout this file, but that's not appropriate
639 ;;; globally. And we must not inline them in the rest of this file if
640 ;;; dispatch to gray or simple streams is to work, since both redefine
641 ;;; these functions later.)
642 (declaim (notinline read-char unread-char read-byte listen))
644 ;;; This is called from ANSI-STREAM routines that encapsulate CLOS
645 ;;; streams to handle the misc routines and dispatch to the
646 ;;; appropriate SIMPLE- or FUNDAMENTAL-STREAM functions.
647 (defun stream-misc-dispatch (stream operation &optional arg1 arg2)
648 (declare (type stream stream) (ignore arg2))
651 ;; Return T if input available, :EOF for end-of-file, otherwise NIL.
652 (let ((char (read-char-no-hang stream nil :eof)))
653 (when (characterp char)
654 (unread-char char stream))
657 (unread-char arg1 stream))
661 (clear-input stream))
663 (force-output stream))
665 (finish-output stream))
667 (stream-element-type stream))
668 (:stream-external-format
669 (stream-external-format stream))
671 (interactive-stream-p stream))
673 (line-length stream))
677 (file-length stream))
679 (file-string-length stream arg1))
681 (file-position stream arg1))))
683 ;;;; broadcast streams
685 (defstruct (broadcast-stream (:include ansi-stream
686 (out #'broadcast-out)
687 (bout #'broadcast-bout)
688 (sout #'broadcast-sout)
689 (misc #'broadcast-misc))
690 (:constructor %make-broadcast-stream
693 ;; a list of all the streams we broadcast to
694 (streams () :type list :read-only t))
696 (defun make-broadcast-stream (&rest streams)
697 (dolist (stream streams)
698 (unless (output-stream-p stream)
701 :expected-type '(satisfies output-stream-p))))
702 (apply #'%make-broadcast-stream streams))
704 (macrolet ((out-fun (name fun &rest args)
705 `(defun ,name (stream ,@args)
706 (dolist (stream (broadcast-stream-streams stream))
707 (,fun ,(car args) stream ,@(cdr args))))))
708 (out-fun broadcast-out write-char char)
709 (out-fun broadcast-bout write-byte byte)
710 (out-fun broadcast-sout write-string-no-key string start end))
712 (defun broadcast-misc (stream operation &optional arg1 arg2)
713 (let ((streams (broadcast-stream-streams stream)))
715 ;; FIXME: This may not be the best place to note this, but I
716 ;; think the :CHARPOS protocol needs revision. Firstly, I think
717 ;; this is the last place where a NULL return value was possible
718 ;; (before adjusting it to be 0), so a bunch of conditionals IF
719 ;; CHARPOS can be removed; secondly, it is my belief that
720 ;; FD-STREAMS, when running FILE-POSITION, do not update the
721 ;; CHARPOS, and consequently there will be much wrongness.
723 ;; FIXME: see also TWO-WAY-STREAM treatment of :CHARPOS -- why
724 ;; is it testing the :charpos of an input stream?
726 ;; -- CSR, 2004-02-04
728 (dolist (stream streams 0)
729 (let ((charpos (charpos stream)))
730 (if charpos (return charpos)))))
733 (dolist (stream streams min)
734 (let ((res (line-length stream)))
735 (when res (setq min (if min (min res min) res)))))))
737 #+nil ; old, arguably more logical, version
739 (dolist (stream streams (if (> (length res) 1) `(and ,@res) t))
740 (pushnew (stream-element-type stream) res :test #'equal)))
741 ;; ANSI-specified version (under System Class BROADCAST-STREAM)
743 (do ((streams streams (cdr streams)))
745 (when (null (cdr streams))
746 (setq res (stream-element-type (car streams)))))))
748 (let ((res :default))
749 (dolist (stream streams res)
750 (setq res (stream-external-format stream)))))
752 (let ((last (last streams)))
754 (file-length (car last))
758 (let ((res (or (eql arg1 :start) (eql arg1 0))))
759 (dolist (stream streams res)
760 (setq res (file-position stream arg1))))
762 (dolist (stream streams res)
763 (setq res (file-position stream))))))
766 (dolist (stream streams res)
767 (setq res (file-string-length stream arg1)))))
769 (set-closed-flame stream))
772 (dolist (stream streams res)
774 (if (ansi-stream-p stream)
775 (funcall (ansi-stream-misc stream) stream operation
777 (stream-misc-dispatch stream operation arg1 arg2)))))))))
781 (defstruct (synonym-stream (:include ansi-stream
784 (n-bin #'synonym-n-bin)
786 (bout #'synonym-bout)
787 (sout #'synonym-sout)
788 (misc #'synonym-misc))
789 (:constructor make-synonym-stream (symbol))
791 ;; This is the symbol, the value of which is the stream we are synonym to.
792 (symbol nil :type symbol :read-only t))
793 (def!method print-object ((x synonym-stream) stream)
794 (print-unreadable-object (x stream :type t :identity t)
795 (format stream ":SYMBOL ~S" (synonym-stream-symbol x))))
797 ;;; The output simple output methods just call the corresponding
798 ;;; function on the synonymed stream.
799 (macrolet ((out-fun (name fun &rest args)
800 `(defun ,name (stream ,@args)
801 (declare (optimize (safety 1)))
802 (let ((syn (symbol-value (synonym-stream-symbol stream))))
803 (,fun ,(car args) syn ,@(cdr args))))))
804 (out-fun synonym-out write-char ch)
805 (out-fun synonym-bout write-byte n)
806 (out-fun synonym-sout write-string-no-key string start end))
808 ;;; For the input methods, we just call the corresponding function on the
809 ;;; synonymed stream. These functions deal with getting input out of
810 ;;; the In-Buffer if there is any.
811 (macrolet ((in-fun (name fun &rest args)
812 `(defun ,name (stream ,@args)
813 (declare (optimize (safety 1)))
814 (,fun (symbol-value (synonym-stream-symbol stream))
816 (in-fun synonym-in read-char eof-error-p eof-value)
817 (in-fun synonym-bin read-byte eof-error-p eof-value)
818 (in-fun synonym-n-bin read-n-bytes buffer start numbytes eof-error-p))
820 (defun synonym-misc (stream operation &optional arg1 arg2)
821 (declare (optimize (safety 1)))
822 (let ((syn (symbol-value (synonym-stream-symbol stream))))
823 (if (ansi-stream-p syn)
824 ;; We have to special-case some operations which interact with
825 ;; the in-buffer of the wrapped stream, since just calling
826 ;; ANSI-STREAM-MISC on them
828 (:listen (or (/= (the fixnum (ansi-stream-in-index syn))
829 +ansi-stream-in-buffer-length+)
830 (funcall (ansi-stream-misc syn) syn :listen)))
831 (:clear-input (clear-input syn))
832 (:unread (unread-char arg1 syn))
834 (funcall (ansi-stream-misc syn) syn operation arg1 arg2)))
835 (stream-misc-dispatch syn operation arg1 arg2))))
839 (defstruct (two-way-stream
840 (:include ansi-stream
843 (n-bin #'two-way-n-bin)
845 (bout #'two-way-bout)
846 (sout #'two-way-sout)
847 (misc #'two-way-misc))
848 (:constructor %make-two-way-stream (input-stream output-stream))
850 (input-stream (missing-arg) :type stream :read-only t)
851 (output-stream (missing-arg) :type stream :read-only t))
852 (defprinter (two-way-stream) input-stream output-stream)
854 (defun make-two-way-stream (input-stream output-stream)
856 "Return a bidirectional stream which gets its input from INPUT-STREAM and
857 sends its output to OUTPUT-STREAM."
858 ;; FIXME: This idiom of the-real-stream-of-a-possibly-synonym-stream
859 ;; should be encapsulated in a function, and used here and most of
860 ;; the other places that SYNONYM-STREAM-P appears.
861 (unless (output-stream-p output-stream)
864 :expected-type '(satisfies output-stream-p)))
865 (unless (input-stream-p input-stream)
868 :expected-type '(satisfies input-stream-p)))
869 (funcall #'%make-two-way-stream input-stream output-stream))
871 (macrolet ((out-fun (name fun &rest args)
872 `(defun ,name (stream ,@args)
873 (let ((syn (two-way-stream-output-stream stream)))
874 (,fun ,(car args) syn ,@(cdr args))))))
875 (out-fun two-way-out write-char ch)
876 (out-fun two-way-bout write-byte n)
877 (out-fun two-way-sout write-string-no-key string start end))
879 (macrolet ((in-fun (name fun &rest args)
880 `(defun ,name (stream ,@args)
881 (force-output (two-way-stream-output-stream stream))
882 (,fun (two-way-stream-input-stream stream) ,@args))))
883 (in-fun two-way-in read-char eof-error-p eof-value)
884 (in-fun two-way-bin read-byte eof-error-p eof-value)
885 (in-fun two-way-n-bin read-n-bytes buffer start numbytes eof-error-p))
887 (defun two-way-misc (stream operation &optional arg1 arg2)
888 (let* ((in (two-way-stream-input-stream stream))
889 (out (two-way-stream-output-stream stream))
890 (in-ansi-stream-p (ansi-stream-p in))
891 (out-ansi-stream-p (ansi-stream-p out)))
895 (or (/= (the fixnum (ansi-stream-in-index in))
896 +ansi-stream-in-buffer-length+)
897 (funcall (ansi-stream-misc in) in :listen))
899 ((:finish-output :force-output :clear-output)
900 (if out-ansi-stream-p
901 (funcall (ansi-stream-misc out) out operation arg1 arg2)
902 (stream-misc-dispatch out operation arg1 arg2)))
903 (:clear-input (clear-input in))
904 (:unread (unread-char arg1 in))
906 (let ((in-type (stream-element-type in))
907 (out-type (stream-element-type out)))
908 (if (equal in-type out-type)
909 in-type `(and ,in-type ,out-type))))
911 (set-closed-flame stream))
913 (or (if in-ansi-stream-p
914 (funcall (ansi-stream-misc in) in operation arg1 arg2)
915 (stream-misc-dispatch in operation arg1 arg2))
916 (if out-ansi-stream-p
917 (funcall (ansi-stream-misc out) out operation arg1 arg2)
918 (stream-misc-dispatch out operation arg1 arg2)))))))
920 ;;;; concatenated streams
922 (defstruct (concatenated-stream
923 (:include ansi-stream
924 (in #'concatenated-in)
925 (bin #'concatenated-bin)
926 (n-bin #'concatenated-n-bin)
927 (misc #'concatenated-misc))
928 (:constructor %make-concatenated-stream (&rest streams))
930 ;; The car of this is the substream we are reading from now.
931 (streams nil :type list))
932 (def!method print-object ((x concatenated-stream) stream)
933 (print-unreadable-object (x stream :type t :identity t)
936 (concatenated-stream-streams x))))
938 (defun make-concatenated-stream (&rest streams)
940 "Return a stream which takes its input from each of the streams in turn,
941 going on to the next at EOF."
942 (dolist (stream streams)
943 (unless (input-stream-p stream)
946 :expected-type '(satisfies input-stream-p))))
947 (apply #'%make-concatenated-stream streams))
949 (macrolet ((in-fun (name fun)
950 `(defun ,name (stream eof-error-p eof-value)
951 (do ((streams (concatenated-stream-streams stream)
954 (eof-or-lose stream eof-error-p eof-value))
955 (let* ((stream (car streams))
956 (result (,fun stream nil nil)))
957 (when result (return result)))
958 (pop (concatenated-stream-streams stream))))))
959 (in-fun concatenated-in read-char)
960 (in-fun concatenated-bin read-byte))
962 (defun concatenated-n-bin (stream buffer start numbytes eof-errorp)
963 (do ((streams (concatenated-stream-streams stream) (cdr streams))
964 (current-start start)
965 (remaining-bytes numbytes))
968 (error 'end-of-file :stream stream)
969 (- numbytes remaining-bytes)))
970 (let* ((stream (car streams))
971 (bytes-read (read-n-bytes stream buffer current-start
972 remaining-bytes nil)))
973 (incf current-start bytes-read)
974 (decf remaining-bytes bytes-read)
975 (when (zerop remaining-bytes) (return numbytes)))
976 (setf (concatenated-stream-streams stream) (cdr streams))))
978 (defun concatenated-misc (stream operation &optional arg1 arg2)
979 (let* ((left (concatenated-stream-streams stream))
980 (current (car left)))
984 (return-from concatenated-misc :eof))
986 (let ((stuff (if (ansi-stream-p current)
987 (funcall (ansi-stream-misc current) current
989 (stream-misc-dispatch current :listen))))
990 (cond ((eq stuff :eof)
991 ;; Advance STREAMS, and try again.
992 (pop (concatenated-stream-streams stream))
994 (car (concatenated-stream-streams stream)))
996 ;; No further streams. EOF.
999 ;; Stuff's available.
1002 ;; Nothing is available yet.
1004 (:clear-input (when left (clear-input current)))
1005 (:unread (when left (unread-char arg1 current)))
1007 (set-closed-flame stream))
1010 (if (ansi-stream-p current)
1011 (funcall (ansi-stream-misc current) current operation arg1 arg2)
1012 (stream-misc-dispatch current operation arg1 arg2)))))))
1016 (defstruct (echo-stream
1017 (:include two-way-stream
1021 (n-bin #'echo-n-bin))
1022 (:constructor %make-echo-stream (input-stream output-stream))
1025 (def!method print-object ((x echo-stream) stream)
1026 (print-unreadable-object (x stream :type t :identity t)
1028 ":INPUT-STREAM ~S :OUTPUT-STREAM ~S"
1029 (two-way-stream-input-stream x)
1030 (two-way-stream-output-stream x))))
1032 (defun make-echo-stream (input-stream output-stream)
1034 "Return a bidirectional stream which gets its input from INPUT-STREAM and
1035 sends its output to OUTPUT-STREAM. In addition, all input is echoed to
1037 (unless (output-stream-p output-stream)
1039 :datum output-stream
1040 :expected-type '(satisfies output-stream-p)))
1041 (unless (input-stream-p input-stream)
1044 :expected-type '(satisfies input-stream-p)))
1045 (funcall #'%make-echo-stream input-stream output-stream))
1047 (macrolet ((in-fun (name in-fun out-fun &rest args)
1048 `(defun ,name (stream ,@args)
1049 (or (pop (echo-stream-unread-stuff stream))
1050 (let* ((in (echo-stream-input-stream stream))
1051 (out (echo-stream-output-stream stream))
1052 (result (if eof-error-p
1054 (,in-fun in nil in))))
1056 ((eql result in) eof-value)
1057 (t (,out-fun result out) result)))))))
1058 (in-fun echo-in read-char write-char eof-error-p eof-value)
1059 (in-fun echo-bin read-byte write-byte eof-error-p eof-value))
1061 (defun echo-n-bin (stream buffer start numbytes eof-error-p)
1062 (let ((new-start start)
1065 (let ((thing (pop (echo-stream-unread-stuff stream))))
1068 (setf (aref buffer new-start) thing)
1071 (when (= read numbytes)
1072 (return-from echo-n-bin numbytes)))
1074 (let ((bytes-read (read-n-bytes (echo-stream-input-stream stream) buffer
1075 new-start (- numbytes read) nil)))
1078 (write-sequence buffer (echo-stream-output-stream stream)
1079 :start new-start :end (+ new-start bytes-read))
1080 (+ bytes-read read))
1081 ((> numbytes (+ read bytes-read))
1082 (write-sequence buffer (echo-stream-output-stream stream)
1083 :start new-start :end (+ new-start bytes-read))
1084 (error 'end-of-file :stream stream))
1086 (write-sequence buffer (echo-stream-output-stream stream)
1087 :start new-start :end (+ new-start bytes-read))
1088 (aver (= numbytes (+ new-start bytes-read)))
1091 ;;;; STRING-INPUT-STREAM stuff
1093 (defstruct (string-input-stream
1094 (:include ansi-stream
1098 (misc #'string-in-misc))
1099 (:constructor internal-make-string-input-stream
1100 (string current end))
1102 (string (missing-arg) :type simple-string)
1103 (current (missing-arg) :type index)
1104 (end (missing-arg) :type index))
1106 (defun string-inch (stream eof-error-p eof-value)
1107 (declare (type string-input-stream stream))
1108 (let ((string (string-input-stream-string stream))
1109 (index (string-input-stream-current stream)))
1110 (cond ((>= index (the index (string-input-stream-end stream)))
1111 (eof-or-lose stream eof-error-p eof-value))
1113 (setf (string-input-stream-current stream) (1+ index))
1114 (char string index)))))
1116 (defun string-binch (stream eof-error-p eof-value)
1117 (declare (type string-input-stream stream))
1118 (let ((string (string-input-stream-string stream))
1119 (index (string-input-stream-current stream)))
1120 (cond ((>= index (the index (string-input-stream-end stream)))
1121 (eof-or-lose stream eof-error-p eof-value))
1123 (setf (string-input-stream-current stream) (1+ index))
1124 (char-code (char string index))))))
1126 (defun string-stream-read-n-bytes (stream buffer start requested eof-error-p)
1127 (declare (type string-input-stream stream)
1128 (type index start requested))
1129 (let* ((string (string-input-stream-string stream))
1130 (index (string-input-stream-current stream))
1131 (available (- (string-input-stream-end stream) index))
1132 (copy (min available requested)))
1133 (declare (type simple-string string))
1135 (setf (string-input-stream-current stream)
1136 (truly-the index (+ index copy)))
1137 ;; FIXME: why are we VECTOR-SAP'ing things here? what's the point?
1138 ;; and are there SB-UNICODE issues here as well? --njf, 2005-03-24
1139 (with-pinned-objects (string buffer)
1140 (system-area-ub8-copy (vector-sap string)
1142 (if (typep buffer 'system-area-pointer)
1144 (vector-sap buffer))
1147 (if (and (> requested copy) eof-error-p)
1148 (error 'end-of-file :stream stream)
1151 (defun string-in-misc (stream operation &optional arg1 arg2)
1152 (declare (type string-input-stream stream)
1157 (setf (string-input-stream-current stream)
1160 (:end (string-input-stream-end stream))
1161 ;; We allow moving position beyond EOF. Errors happen
1162 ;; on read, not move -- or the user may extend the
1165 (string-input-stream-current stream)))
1166 ;; According to ANSI: "Should signal an error of type type-error
1167 ;; if stream is not a stream associated with a file."
1168 ;; This is checked by FILE-LENGTH, so no need to do it here either.
1169 ;; (:file-length (length (string-input-stream-string stream)))
1170 (:unread (decf (string-input-stream-current stream)))
1171 (:close (set-closed-flame stream))
1172 (:listen (or (/= (the index (string-input-stream-current stream))
1173 (the index (string-input-stream-end stream)))
1175 (:element-type (array-element-type (string-input-stream-string stream)))))
1177 (defun make-string-input-stream (string &optional (start 0) end)
1179 "Return an input stream which will supply the characters of STRING between
1180 START and END in order."
1181 (declare (type string string)
1183 (type (or index null) end))
1184 (let* ((string (coerce string '(simple-array character (*))))
1185 (end (%check-vector-sequence-bounds string start end)))
1186 (with-array-data ((string string) (start start) (end end))
1187 (internal-make-string-input-stream
1188 string ;; now simple
1192 ;;;; STRING-OUTPUT-STREAM stuff
1194 ;;;; FIXME: This, like almost none of the stream code is particularly
1195 ;;;; interrupt or thread-safe. While it should not be possible to
1196 ;;;; corrupt the heap here, it certainly is possible to end up with
1197 ;;;; a string-output-stream whose internal state is messed up.
1199 ;;;; FIXME: It would be nice to support space-efficient
1200 ;;;; string-output-streams with element-type base-char. This would
1201 ;;;; mean either a separate subclass, or typecases in functions.
1203 (defparameter *string-output-stream-buffer-initial-size* 64)
1206 (declaim (inline string-output-string-stream-buffer
1207 string-output-string-stream-pointer
1208 string-output-string-stream-index))
1209 (defstruct (string-output-stream
1210 (:include ansi-stream
1212 (sout #'string-sout)
1213 (misc #'string-out-misc))
1214 (:constructor make-string-output-stream
1215 (&key (element-type 'character)
1218 *string-output-stream-buffer-initial-size*))))
1220 ;; The string we throw stuff in.
1221 (buffer (missing-arg) :type (simple-array character (*)))
1222 ;; Chains of buffers to use
1225 ;; Index of the next location to use in the current string.
1226 (pointer 0 :type index)
1227 ;; Global location in the stream
1228 (index 0 :type index)
1229 ;; Index cache: when we move backwards we save the greater of this
1230 ;; and index here, so the greater of index and this is always the
1231 ;; end of the stream.
1232 (index-cache 0 :type index)
1233 ;; Requested element type
1234 (element-type 'character))
1237 (setf (fdocumentation 'make-string-output-stream 'function)
1238 "Return an output stream which will accumulate all output given it for the
1239 benefit of the function GET-OUTPUT-STREAM-STRING.")
1241 ;;; Pushes the current segment onto the prev-list, and either pops
1242 ;;; or allocates a new one.
1243 (defun string-output-stream-new-buffer (stream size)
1244 (declare (index size))
1245 (/show0 "/string-output-stream-new-buffer")
1246 (push (string-output-stream-buffer stream)
1247 (string-output-stream-prev stream))
1248 (setf (string-output-stream-buffer stream)
1249 (or (pop (string-output-stream-next stream))
1250 ;; FIXME: This would be the correct place to detect that
1251 ;; more then FIXNUM characters are being written to the
1252 ;; stream, and do something about it.
1253 (make-string size))))
1255 ;;; Moves to the end of the next segment or the current one if there are
1256 ;;; no more segments. Returns true as long as there are next segments.
1257 (defun string-output-stream-next-buffer (stream)
1258 (/show0 "/string-output-stream-next-buffer")
1259 (let* ((old (string-output-stream-buffer stream))
1260 (new (pop (string-output-stream-next stream)))
1261 (old-size (length old))
1262 (skipped (- old-size (string-output-stream-pointer stream))))
1264 (let ((new-size (length new)))
1265 (push old (string-output-stream-prev stream))
1266 (setf (string-output-stream-buffer stream) new
1267 (string-output-stream-pointer stream) new-size)
1268 (incf (string-output-stream-index stream) (+ skipped new-size)))
1271 (setf (string-output-stream-pointer stream) old-size)
1272 (incf (string-output-stream-index stream) skipped)
1275 ;;; Moves to the start of the previous segment or the current one if there
1276 ;;; are no more segments. Returns true as long as there are prev segments.
1277 (defun string-output-stream-prev-buffer (stream)
1278 (/show0 "/string-output-stream-prev-buffer")
1279 (let ((old (string-output-stream-buffer stream))
1280 (new (pop (string-output-stream-prev stream)))
1281 (skipped (string-output-stream-pointer stream)))
1283 (push old (string-output-stream-next stream))
1284 (setf (string-output-stream-buffer stream) new
1285 (string-output-stream-pointer stream) 0)
1286 (decf (string-output-stream-index stream) (+ skipped (length new)))
1289 (setf (string-output-stream-pointer stream) 0)
1290 (decf (string-output-stream-index stream) skipped)
1293 (defun string-ouch (stream character)
1294 (/show0 "/string-ouch")
1295 (let ((pointer (string-output-stream-pointer stream))
1296 (buffer (string-output-stream-buffer stream))
1297 (index (string-output-stream-index stream)))
1298 (cond ((= pointer (length buffer))
1299 (setf buffer (string-output-stream-new-buffer stream index)
1300 (aref buffer 0) character
1301 (string-output-stream-pointer stream) 1))
1303 (setf (aref buffer pointer) character
1304 (string-output-stream-pointer stream) (1+ pointer))))
1305 (setf (string-output-stream-index stream) (1+ index))))
1307 (defun string-sout (stream string start end)
1308 (declare (type simple-string string)
1309 (type index start end))
1310 (let* ((full-length (- end start))
1311 (length full-length)
1312 (buffer (string-output-stream-buffer stream))
1313 (pointer (string-output-stream-pointer stream))
1314 (space (- (length buffer) pointer))
1315 (here (min space length))
1316 (stop (+ start here))
1317 (overflow (- length space)))
1318 (declare (index length space here stop full-length)
1320 (type (simple-array character (*)) buffer))
1325 ((simple-array character (*))
1326 (replace buffer string :start1 pointer :start2 start :end2 stop))
1328 (replace buffer string :start1 pointer :start2 start :end2 stop))
1329 ((simple-array nil (*))
1330 (replace buffer string :start1 pointer :start2 start :end2 stop)))
1331 (setf (string-output-stream-pointer stream) (+ here pointer)))
1332 (when (plusp overflow)
1334 length (- end start)
1335 buffer (string-output-stream-new-buffer
1336 stream (max overflow (string-output-stream-index stream)))
1338 space (length buffer)
1339 here (min space length)
1341 ;; there may be more overflow if we used a buffer
1342 ;; already allocated to the stream
1343 overflow (- length space))
1345 (incf (string-output-stream-index stream) full-length)))
1347 ;;; Factored out of the -misc method due to size.
1348 (defun set-string-output-stream-file-position (stream pos)
1349 (let* ((index (string-output-stream-index stream))
1350 (end (max index (string-output-stream-index-cache stream))))
1351 (declare (index index end))
1352 (setf (string-output-stream-index-cache stream) end)
1353 (cond ((eq :start pos)
1354 (loop while (string-output-stream-prev-buffer stream)))
1356 (loop while (string-output-stream-next-buffer stream))
1357 (let ((over (- (string-output-stream-index stream) end)))
1358 (decf (string-output-stream-pointer stream) over))
1359 (setf (string-output-stream-index stream) end))
1361 (loop while (< pos index)
1362 do (string-output-stream-prev-buffer stream)
1363 (setf index (string-output-stream-index stream)))
1364 (let ((step (- pos index)))
1365 (incf (string-output-stream-pointer stream) step)
1366 (setf (string-output-stream-index stream) pos)))
1368 ;; We allow moving beyond the end of stream, implicitly
1369 ;; extending the output stream.
1370 (let ((next (string-output-stream-next-buffer stream)))
1371 ;; Update after -next-buffer, INDEX is kept pointing at
1372 ;; the end of the current buffer.
1373 (setf index (string-output-stream-index stream))
1374 (loop while (and next (> pos index))
1375 do (setf next (string-output-stream-next-buffer stream)
1376 index (string-output-stream-index stream))))
1377 ;; Allocate new buffer if needed, or step back to
1378 ;; the desired index and set pointer and index
1380 (let ((diff (- pos index)))
1382 (let* ((new (string-output-stream-new-buffer stream diff))
1383 (size (length new)))
1384 (aver (= pos (+ index size)))
1385 (setf (string-output-stream-pointer stream) size
1386 (string-output-stream-index stream) pos))
1387 (let ((size (length (string-output-stream-buffer stream))))
1388 (setf (string-output-stream-pointer stream) (+ size diff)
1389 (string-output-stream-index stream) pos))))))))
1391 (defun string-out-misc (stream operation &optional arg1 arg2)
1392 (declare (ignore arg2))
1395 ;; Keeping this first is a silly micro-optimization: FRESH-LINE
1396 ;; makes this the most common one.
1397 (/show0 "/string-out-misc charpos")
1398 (prog ((pointer (string-output-stream-pointer stream))
1399 (buffer (string-output-stream-buffer stream))
1400 (prev (string-output-stream-prev stream))
1403 (let ((pos (position #\newline buffer :from-end t :end pointer)))
1404 (when (or pos (not buffer))
1405 ;; If newline is at index I, and pointer at index I+N, charpos
1406 ;; is N-1. If there is no newline, and pointer is at index N,
1408 (return (+ base (if pos (- pointer pos 1) pointer))))
1409 (setf base (+ base pointer)
1411 pointer (length buffer))
1412 (/show0 "/string-out-misc charpos next")
1415 (/show0 "/string-out-misc file-position")
1417 (set-string-output-stream-file-position stream arg1))
1418 (string-output-stream-index stream))
1420 (/show0 "/string-out-misc close")
1421 (set-closed-flame stream))
1422 (:element-type (string-output-stream-element-type stream))))
1424 ;;; Return a string of all the characters sent to a stream made by
1425 ;;; MAKE-STRING-OUTPUT-STREAM since the last call to this function.
1426 (defun get-output-stream-string (stream)
1427 (declare (type string-output-stream stream))
1428 (let* ((length (max (string-output-stream-index stream)
1429 (string-output-stream-index-cache stream)))
1430 (element-type (string-output-stream-element-type stream))
1431 (prev (string-output-stream-prev stream))
1432 (this (string-output-stream-buffer stream))
1433 (next (string-output-stream-next stream))
1436 ;; overwhelmingly common case: can be inlined
1438 ;; FIXME: If we were willing to use %SHRINK-VECTOR here,
1439 ;; and allocate new strings the size of 2 * index in
1440 ;; STRING-SOUT, we would not need to allocate one here in
1441 ;; the common case, but could just use the last one
1442 ;; allocated, and chop it down to size..
1444 ((character) (make-string length))
1445 ;; slightly less common cases: inline it anyway
1446 ((base-char standard-char)
1447 (make-string length :element-type 'base-char))
1449 (make-string length :element-type element-type)))))
1451 (setf (string-output-stream-index stream) 0
1452 (string-output-stream-index-cache stream) 0
1453 (string-output-stream-pointer stream) 0
1454 ;; throw them away for simplicity's sake: this way the rest of the
1455 ;; implementation can assume that the greater of INDEX and INDEX-CACHE
1456 ;; is always within the last buffer.
1457 (string-output-stream-prev stream) nil
1458 (string-output-stream-next stream) nil)
1460 (flet ((replace-all (fun)
1462 (declare (index start))
1463 (dolist (buffer (nreverse prev))
1464 (funcall fun buffer start)
1465 (incf start (length buffer)))
1466 (funcall fun this start)
1467 (incf start (length this))
1468 (dolist (buffer next)
1469 (funcall fun buffer start)
1470 (incf start (length buffer))))))
1471 (macrolet ((frob (type)
1472 `(replace-all (lambda (buffer from)
1473 (declare (type ,type result)
1474 (type (simple-array character (*))
1476 (replace result buffer :start1 from)))))
1478 ((simple-array character (*))
1479 (frob (simple-array character (*))))
1481 (frob simple-base-string))
1482 ((simple-array nil (*))
1483 (frob (simple-array nil (*)))))))
1487 ;;;; fill-pointer streams
1489 ;;; Fill pointer STRING-OUTPUT-STREAMs are not explicitly mentioned in
1490 ;;; the CLM, but they are required for the implementation of
1491 ;;; WITH-OUTPUT-TO-STRING.
1493 ;;; FIXME: need to support (VECTOR BASE-CHAR) and (VECTOR NIL),
1494 ;;; ideally without destroying all hope of efficiency.
1495 (deftype string-with-fill-pointer ()
1496 '(and (vector character)
1497 (satisfies array-has-fill-pointer-p)))
1499 (defstruct (fill-pointer-output-stream
1500 (:include ansi-stream
1501 (out #'fill-pointer-ouch)
1502 (sout #'fill-pointer-sout)
1503 (misc #'fill-pointer-misc))
1504 (:constructor make-fill-pointer-output-stream (string))
1506 ;; a string with a fill pointer where we stuff the stuff we write
1507 (string (missing-arg) :type string-with-fill-pointer :read-only t))
1509 (defun fill-pointer-ouch (stream character)
1510 (let* ((buffer (fill-pointer-output-stream-string stream))
1511 (current (fill-pointer buffer))
1512 (current+1 (1+ current)))
1513 (declare (fixnum current))
1514 (with-array-data ((workspace buffer) (start) (end))
1515 (declare (type (simple-array character (*)) workspace))
1516 (let ((offset-current (+ start current)))
1517 (declare (fixnum offset-current))
1518 (if (= offset-current end)
1519 (let* ((new-length (1+ (* current 2)))
1520 (new-workspace (make-string new-length)))
1521 (declare (type (simple-array character (*)) new-workspace))
1522 (replace new-workspace workspace
1523 :start2 start :end2 offset-current)
1524 (setf workspace new-workspace
1525 offset-current current)
1526 (set-array-header buffer workspace new-length
1527 current+1 0 new-length nil))
1528 (setf (fill-pointer buffer) current+1))
1529 (setf (schar workspace offset-current) character)))
1532 (defun fill-pointer-sout (stream string start end)
1533 (declare (simple-string string) (fixnum start end))
1534 (let* ((string (if (typep string '(simple-array character (*)))
1536 (coerce string '(simple-array character (*)))))
1537 (buffer (fill-pointer-output-stream-string stream))
1538 (current (fill-pointer buffer))
1539 (string-len (- end start))
1540 (dst-end (+ string-len current)))
1541 (declare (fixnum current dst-end string-len))
1542 (with-array-data ((workspace buffer) (dst-start) (dst-length))
1543 (declare (type (simple-array character (*)) workspace))
1544 (let ((offset-dst-end (+ dst-start dst-end))
1545 (offset-current (+ dst-start current)))
1546 (declare (fixnum offset-dst-end offset-current))
1547 (if (> offset-dst-end dst-length)
1548 (let* ((new-length (+ (the fixnum (* current 2)) string-len))
1549 (new-workspace (make-string new-length)))
1550 (declare (type (simple-array character (*)) new-workspace))
1551 (replace new-workspace workspace
1552 :start2 dst-start :end2 offset-current)
1553 (setf workspace new-workspace
1554 offset-current current
1555 offset-dst-end dst-end)
1556 (set-array-header buffer workspace new-length
1557 dst-end 0 new-length nil))
1558 (setf (fill-pointer buffer) dst-end))
1559 (replace workspace string
1560 :start1 offset-current :start2 start :end2 end)))
1563 (defun fill-pointer-misc (stream operation &optional arg1 arg2)
1564 (declare (ignore arg2))
1567 (let ((buffer (fill-pointer-output-stream-string stream)))
1569 (setf (fill-pointer buffer)
1572 ;; Fill-pointer is always at fill-pointer we will
1573 ;; make :END move to the end of the actual string.
1574 (:end (array-total-size buffer))
1575 ;; We allow moving beyond the end of string if the
1576 ;; string is adjustable.
1577 (t (when (>= arg1 (array-total-size buffer))
1578 (if (adjustable-array-p buffer)
1579 (adjust-array buffer arg1)
1580 (error "Cannot move FILE-POSITION beyond the end ~
1581 of WITH-OUTPUT-TO-STRING stream ~
1582 constructed with non-adjustable string.")))
1584 (fill-pointer buffer))))
1586 (let* ((buffer (fill-pointer-output-stream-string stream))
1587 (current (fill-pointer buffer)))
1588 (with-array-data ((string buffer) (start) (end current))
1589 (declare (simple-string string) (ignore start))
1590 (let ((found (position #\newline string :test #'char=
1591 :end end :from-end t)))
1593 (- end (the fixnum found))
1595 (:element-type (array-element-type
1596 (fill-pointer-output-stream-string stream)))))
1598 ;;;; indenting streams
1600 (defstruct (indenting-stream (:include ansi-stream
1601 (out #'indenting-out)
1602 (sout #'indenting-sout)
1603 (misc #'indenting-misc))
1604 (:constructor make-indenting-stream (stream))
1606 ;; the stream we're based on
1608 ;; how much we indent on each line
1612 (setf (fdocumentation 'make-indenting-stream 'function)
1613 "Return an output stream which indents its output by some amount.")
1615 ;;; INDENTING-INDENT writes the correct number of spaces needed to indent
1616 ;;; output on the given STREAM based on the specified SUB-STREAM.
1617 (defmacro indenting-indent (stream sub-stream)
1618 ;; KLUDGE: bare magic number 60
1619 `(do ((i 0 (+ i 60))
1620 (indentation (indenting-stream-indentation ,stream)))
1621 ((>= i indentation))
1623 #.(make-string 60 :initial-element #\Space)
1626 (min 60 (- indentation i)))))
1628 ;;; INDENTING-OUT writes a character to an indenting stream.
1629 (defun indenting-out (stream char)
1630 (let ((sub-stream (indenting-stream-stream stream)))
1631 (write-char char sub-stream)
1632 (if (char= char #\newline)
1633 (indenting-indent stream sub-stream))))
1635 ;;; INDENTING-SOUT writes a string to an indenting stream.
1636 (defun indenting-sout (stream string start end)
1637 (declare (simple-string string) (fixnum start end))
1639 (sub-stream (indenting-stream-stream stream)))
1641 (let ((newline (position #\newline string :start i :end end)))
1643 (%write-string string sub-stream i (1+ newline))
1644 (indenting-indent stream sub-stream)
1645 (setq i (+ newline 1)))
1647 (%write-string string sub-stream i end)
1650 ;;; INDENTING-MISC just treats just the :LINE-LENGTH message
1651 ;;; differently. INDENTING-CHARPOS says the charpos is the charpos of
1652 ;;; the base stream minus the stream's indentation.
1653 (defun indenting-misc (stream operation &optional arg1 arg2)
1654 (let ((sub-stream (indenting-stream-stream stream)))
1655 (if (ansi-stream-p sub-stream)
1656 (let ((method (ansi-stream-misc sub-stream)))
1659 (let ((line-length (funcall method sub-stream operation)))
1661 (- line-length (indenting-stream-indentation stream)))))
1663 (let ((charpos (funcall method sub-stream operation)))
1665 (- charpos (indenting-stream-indentation stream)))))
1667 (funcall method sub-stream operation arg1 arg2))))
1668 ;; must be Gray streams FUNDAMENTAL-STREAM
1671 (let ((line-length (stream-line-length sub-stream)))
1673 (- line-length (indenting-stream-indentation stream)))))
1675 (let ((charpos (stream-line-column sub-stream)))
1677 (- charpos (indenting-stream-indentation stream)))))
1679 (stream-misc-dispatch sub-stream operation arg1 arg2))))))
1681 (declaim (maybe-inline read-char unread-char read-byte listen))
1683 ;;;; case frobbing streams, used by FORMAT ~(...~)
1685 (defstruct (case-frob-stream
1686 (:include ansi-stream
1687 (misc #'case-frob-misc))
1688 (:constructor %make-case-frob-stream (target out sout))
1690 (target (missing-arg) :type stream))
1692 (defun make-case-frob-stream (target kind)
1694 "Return a stream that sends all output to the stream TARGET, but modifies
1695 the case of letters, depending on KIND, which should be one of:
1696 :UPCASE - convert to upper case.
1697 :DOWNCASE - convert to lower case.
1698 :CAPITALIZE - convert the first letter of words to upper case and the
1699 rest of the word to lower case.
1700 :CAPITALIZE-FIRST - convert the first letter of the first word to upper
1701 case and everything else to lower case."
1702 (declare (type stream target)
1703 (type (member :upcase :downcase :capitalize :capitalize-first)
1706 (if (case-frob-stream-p target)
1707 ;; If we are going to be writing to a stream that already does
1708 ;; case frobbing, why bother frobbing the case just so it can
1711 (multiple-value-bind (out sout)
1714 (values #'case-frob-upcase-out
1715 #'case-frob-upcase-sout))
1717 (values #'case-frob-downcase-out
1718 #'case-frob-downcase-sout))
1720 (values #'case-frob-capitalize-out
1721 #'case-frob-capitalize-sout))
1723 (values #'case-frob-capitalize-first-out
1724 #'case-frob-capitalize-first-sout)))
1725 (%make-case-frob-stream target out sout))))
1727 (defun case-frob-misc (stream op &optional arg1 arg2)
1728 (declare (type case-frob-stream stream))
1731 (set-closed-flame stream))
1733 (let ((target (case-frob-stream-target stream)))
1734 (if (ansi-stream-p target)
1735 (funcall (ansi-stream-misc target) target op arg1 arg2)
1736 (stream-misc-dispatch target op arg1 arg2))))))
1738 (defun case-frob-upcase-out (stream char)
1739 (declare (type case-frob-stream stream)
1740 (type character char))
1741 (let ((target (case-frob-stream-target stream))
1742 (char (char-upcase char)))
1743 (if (ansi-stream-p target)
1744 (funcall (ansi-stream-out target) target char)
1745 (stream-write-char target char))))
1747 (defun case-frob-upcase-sout (stream str start end)
1748 (declare (type case-frob-stream stream)
1749 (type simple-string str)
1751 (type (or index null) end))
1752 (let* ((target (case-frob-stream-target stream))
1755 (string (if (and (zerop start) (= len end))
1757 (nstring-upcase (subseq str start end))))
1758 (string-len (- end start)))
1759 (if (ansi-stream-p target)
1760 (funcall (ansi-stream-sout target) target string 0 string-len)
1761 (stream-write-string target string 0 string-len))))
1763 (defun case-frob-downcase-out (stream char)
1764 (declare (type case-frob-stream stream)
1765 (type character char))
1766 (let ((target (case-frob-stream-target stream))
1767 (char (char-downcase char)))
1768 (if (ansi-stream-p target)
1769 (funcall (ansi-stream-out target) target char)
1770 (stream-write-char target char))))
1772 (defun case-frob-downcase-sout (stream str start end)
1773 (declare (type case-frob-stream stream)
1774 (type simple-string str)
1776 (type (or index null) end))
1777 (let* ((target (case-frob-stream-target stream))
1780 (string (if (and (zerop start) (= len end))
1781 (string-downcase str)
1782 (nstring-downcase (subseq str start end))))
1783 (string-len (- end start)))
1784 (if (ansi-stream-p target)
1785 (funcall (ansi-stream-sout target) target string 0 string-len)
1786 (stream-write-string target string 0 string-len))))
1788 (defun case-frob-capitalize-out (stream char)
1789 (declare (type case-frob-stream stream)
1790 (type character char))
1791 (let ((target (case-frob-stream-target stream)))
1792 (cond ((alphanumericp char)
1793 (let ((char (char-upcase char)))
1794 (if (ansi-stream-p target)
1795 (funcall (ansi-stream-out target) target char)
1796 (stream-write-char target char)))
1797 (setf (case-frob-stream-out stream) #'case-frob-capitalize-aux-out)
1798 (setf (case-frob-stream-sout stream)
1799 #'case-frob-capitalize-aux-sout))
1801 (if (ansi-stream-p target)
1802 (funcall (ansi-stream-out target) target char)
1803 (stream-write-char target char))))))
1805 (defun case-frob-capitalize-sout (stream str start end)
1806 (declare (type case-frob-stream stream)
1807 (type simple-string str)
1809 (type (or index null) end))
1810 (let* ((target (case-frob-stream-target stream))
1811 (str (subseq str start end))
1815 (let ((char (schar str i)))
1816 (cond ((not (alphanumericp char))
1817 (setf inside-word nil))
1819 (setf (schar str i) (char-downcase char)))
1821 (setf inside-word t)
1822 (setf (schar str i) (char-upcase char))))))
1824 (setf (case-frob-stream-out stream)
1825 #'case-frob-capitalize-aux-out)
1826 (setf (case-frob-stream-sout stream)
1827 #'case-frob-capitalize-aux-sout))
1828 (if (ansi-stream-p target)
1829 (funcall (ansi-stream-sout target) target str 0 len)
1830 (stream-write-string target str 0 len))))
1832 (defun case-frob-capitalize-aux-out (stream char)
1833 (declare (type case-frob-stream stream)
1834 (type character char))
1835 (let ((target (case-frob-stream-target stream)))
1836 (cond ((alphanumericp char)
1837 (let ((char (char-downcase char)))
1838 (if (ansi-stream-p target)
1839 (funcall (ansi-stream-out target) target char)
1840 (stream-write-char target char))))
1842 (if (ansi-stream-p target)
1843 (funcall (ansi-stream-out target) target char)
1844 (stream-write-char target char))
1845 (setf (case-frob-stream-out stream)
1846 #'case-frob-capitalize-out)
1847 (setf (case-frob-stream-sout stream)
1848 #'case-frob-capitalize-sout)))))
1850 (defun case-frob-capitalize-aux-sout (stream str start end)
1851 (declare (type case-frob-stream stream)
1852 (type simple-string str)
1854 (type (or index null) end))
1855 (let* ((target (case-frob-stream-target stream))
1856 (str (subseq str start end))
1860 (let ((char (schar str i)))
1861 (cond ((not (alphanumericp char))
1862 (setf inside-word nil))
1864 (setf (schar str i) (char-downcase char)))
1866 (setf inside-word t)
1867 (setf (schar str i) (char-upcase char))))))
1869 (setf (case-frob-stream-out stream)
1870 #'case-frob-capitalize-out)
1871 (setf (case-frob-stream-sout stream)
1872 #'case-frob-capitalize-sout))
1873 (if (ansi-stream-p target)
1874 (funcall (ansi-stream-sout target) target str 0 len)
1875 (stream-write-string target str 0 len))))
1877 (defun case-frob-capitalize-first-out (stream char)
1878 (declare (type case-frob-stream stream)
1879 (type character char))
1880 (let ((target (case-frob-stream-target stream)))
1881 (cond ((alphanumericp char)
1882 (let ((char (char-upcase char)))
1883 (if (ansi-stream-p target)
1884 (funcall (ansi-stream-out target) target char)
1885 (stream-write-char target char)))
1886 (setf (case-frob-stream-out stream)
1887 #'case-frob-downcase-out)
1888 (setf (case-frob-stream-sout stream)
1889 #'case-frob-downcase-sout))
1891 (if (ansi-stream-p target)
1892 (funcall (ansi-stream-out target) target char)
1893 (stream-write-char target char))))))
1895 (defun case-frob-capitalize-first-sout (stream str start end)
1896 (declare (type case-frob-stream stream)
1897 (type simple-string str)
1899 (type (or index null) end))
1900 (let* ((target (case-frob-stream-target stream))
1901 (str (subseq str start end))
1904 (let ((char (schar str i)))
1905 (when (alphanumericp char)
1906 (setf (schar str i) (char-upcase char))
1907 (do ((i (1+ i) (1+ i)))
1909 (setf (schar str i) (char-downcase (schar str i))))
1910 (setf (case-frob-stream-out stream)
1911 #'case-frob-downcase-out)
1912 (setf (case-frob-stream-sout stream)
1913 #'case-frob-downcase-sout)
1915 (if (ansi-stream-p target)
1916 (funcall (ansi-stream-sout target) target str 0 len)
1917 (stream-write-string target str 0 len))))
1921 (defun read-sequence (seq stream &key (start 0) end)
1923 "Destructively modify SEQ by reading elements from STREAM.
1924 That part of SEQ bounded by START and END is destructively modified by
1925 copying successive elements into it from STREAM. If the end of file
1926 for STREAM is reached before copying all elements of the subsequence,
1927 then the extra elements near the end of sequence are not updated, and
1928 the index of the next element is returned."
1929 (declare (type sequence seq)
1930 (type stream stream)
1932 (type sequence-end end)
1934 (if (ansi-stream-p stream)
1935 (ansi-stream-read-sequence seq stream start end)
1936 ;; must be Gray streams FUNDAMENTAL-STREAM
1937 (stream-read-sequence stream seq start end)))
1939 (declaim (inline compatible-vector-and-stream-element-types-p))
1940 (defun compatible-vector-and-stream-element-types-p (vector stream)
1941 (declare (type vector vector)
1942 (type ansi-stream stream))
1943 (or (and (typep vector '(simple-array (unsigned-byte 8) (*)))
1944 (subtypep (stream-element-type stream) '(unsigned-byte 8)))
1945 (and (typep vector '(simple-array (signed-byte 8) (*)))
1946 (subtypep (stream-element-type stream) '(signed-byte 8)))))
1948 (defun ansi-stream-read-sequence (seq stream start %end)
1949 (declare (type sequence seq)
1950 (type ansi-stream stream)
1952 (type sequence-end %end)
1954 (let ((end (or %end (length seq))))
1955 (declare (type index end))
1958 (let ((read-function
1959 (if (subtypep (stream-element-type stream) 'character)
1960 #'ansi-stream-read-char
1961 #'ansi-stream-read-byte)))
1962 (do ((rem (nthcdr start seq) (rest rem))
1964 ((or (endp rem) (>= i end)) i)
1965 (declare (type list rem)
1967 (let ((el (funcall read-function stream nil :eof nil)))
1970 (setf (first rem) el)))))
1972 (with-array-data ((data seq) (offset-start start) (offset-end end))
1973 (if (compatible-vector-and-stream-element-types-p data stream)
1974 (let* ((numbytes (- end start))
1975 (bytes-read (read-n-bytes stream data offset-start
1977 (if (< bytes-read numbytes)
1978 (+ start bytes-read)
1980 (let ((read-function
1981 (if (subtypep (stream-element-type stream) 'character)
1982 ;; If the stream-element-type is CHARACTER,
1983 ;; this might be a bivalent stream. If the
1984 ;; sequence is a specialized unsigned-byte
1985 ;; vector, try to read use binary IO. It'll
1986 ;; signal an error if stream is an pure
1987 ;; character stream.
1988 (if (subtypep (array-element-type data)
1990 #'ansi-stream-read-byte
1991 #'ansi-stream-read-char)
1992 #'ansi-stream-read-byte)))
1993 (do ((i offset-start (1+ i)))
1994 ((>= i offset-end) end)
1995 (declare (type index i))
1996 (let ((el (funcall read-function stream nil :eof nil)))
1998 (return (+ start (- i offset-start))))
1999 (setf (aref data i) el))))))))))
2003 (defun write-sequence (seq stream &key (start 0) (end nil))
2005 "Write the elements of SEQ bounded by START and END to STREAM."
2006 (declare (type sequence seq)
2007 (type stream stream)
2009 (type sequence-end end)
2011 (if (ansi-stream-p stream)
2012 (ansi-stream-write-sequence seq stream start end)
2013 ;; must be Gray-streams FUNDAMENTAL-STREAM
2014 (stream-write-sequence stream seq start end)))
2016 (defun ansi-stream-write-sequence (seq stream start %end)
2017 (declare (type sequence seq)
2018 (type ansi-stream stream)
2020 (type sequence-end %end)
2022 (let ((end (or %end (length seq))))
2023 (declare (type index end))
2026 (let ((write-function
2027 (if (subtypep (stream-element-type stream) 'character)
2028 (ansi-stream-out stream)
2029 (ansi-stream-bout stream))))
2030 (do ((rem (nthcdr start seq) (rest rem))
2032 ((or (endp rem) (>= i end)))
2033 (declare (type list rem)
2035 (funcall write-function stream (first rem)))))
2037 (%write-string seq stream start end))
2039 (with-array-data ((data seq) (offset-start start) (offset-end end))
2041 ((output-seq-in-loop ()
2042 (let ((write-function
2043 (if (subtypep (stream-element-type stream) 'character)
2044 (lambda (stream object)
2045 ;; This might be a bivalent stream, so we need
2046 ;; to dispatch on a per-element basis, rather
2047 ;; than just based on the sequence or stream
2049 (if (characterp object)
2050 (funcall (ansi-stream-out stream)
2052 (funcall (ansi-stream-bout stream)
2054 (ansi-stream-bout stream))))
2055 (do ((i offset-start (1+ i)))
2057 (declare (type index i))
2058 (funcall write-function stream (aref data i))))))
2059 (if (and (fd-stream-p stream)
2060 (compatible-vector-and-stream-element-types-p data stream))
2061 (buffer-output stream data offset-start offset-end)
2062 (output-seq-in-loop)))))))