1 ;;;; tests related to Lisp streams
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; While most of SBCL is derived from the CMU CL system, the test
7 ;;;; files (like this one) were written from scratch after the fork
10 ;;;; This software is in the public domain and is provided with
11 ;;;; absolutely no warranty. See the COPYING and CREDITS files for
12 ;;;; more information.
16 ;;; Until sbcl-0.6.11.31, we didn't have an N-BIN method for
17 ;;; CONCATENATED-STREAM, so stuff like this would fail.
18 (let ((stream (make-concatenated-stream (make-string-input-stream "Demo")))
19 (buffer (make-string 4)))
20 (read-sequence buffer stream))
21 ;;; test for the new N-BIN method doing what it's supposed to
22 (let* ((substrings (list "This " "is " "a " ""
23 "test of concatenated streams behaving "
24 "as ordinary streams do under READ-SEQUENCE. "
25 (make-string 140041 :initial-element #\%)
26 "For any size of read.."
27 (make-string 4123 :initial-element #\.)
28 "they should give the same results."
29 (make-string (expt 2 14) :initial-element #\*)
30 "There should be no differences."))
31 (substreams (mapcar #'make-string-input-stream substrings))
32 (concatenated-stream (apply #'make-concatenated-stream substreams))
33 (concatenated-string (apply #'concatenate 'string substrings))
34 (stream (make-string-input-stream concatenated-string))
36 (buffer-1 (make-string max-n-to-read))
37 (buffer-2 (make-string max-n-to-read)))
39 (let* ((n-to-read (random max-n-to-read))
40 (n-actually-read-1 (read-sequence buffer-1
43 (n-actually-read-2 (read-sequence buffer-2
46 ;; (format t "buffer-1=~S~%buffer-2=~S~%" buffer-1 buffer-2)
47 (assert (= n-actually-read-1 n-actually-read-2))
48 (assert (string= buffer-1 buffer-2
49 :end1 n-actually-read-1
50 :end2 n-actually-read-2))
51 (unless (= n-actually-read-1 n-to-read)
52 (assert (< n-actually-read-1 n-to-read))
55 ;;; Entomotomy PEEK-CHAR-WRONGLY-ECHOS-TO-ECHO-STREAM bug, fixed by
56 ;;; MRD patch sbcl-devel 2002-11-02 merged ca. sbcl-0.7.9.32...
58 (with-output-to-string (out)
61 (make-string-input-stream "ab cd e df s]") out)))
62 ;; (Before the fix, the result had a trailing #\] in it.)
64 ;;; ...and a missing wrinkle in the original patch, dealing with
65 ;;; PEEK-CHAR/UNREAD-CHAR on ECHO-STREAMs, fixed by MRD patch
66 ;;; sbcl-devel 2002-11-18, merged ca. sbcl-0.7.9.66
68 (let* ((in-stream (make-string-input-stream "abc"))
69 (out-stream (make-string-output-stream))
70 (echo-stream (make-echo-stream in-stream out-stream)))
71 (unread-char (read-char echo-stream) echo-stream)
72 (peek-char #\a echo-stream)
73 (get-output-stream-string out-stream))
74 ;; (Before the fix, the LET* expression just signalled an error.)
77 ;;; Reported by Fredrik Sandstrom to sbcl-devel 2005-05-17 ("Bug in
79 ;;; Description: In (peek-char nil s nil foo), if foo happens to be
80 ;;; the same character that peek-char returns, the character is
81 ;;; removed from the input stream, as if read by read-char.
82 (assert (equal (with-input-from-string (s "123")
83 (list (peek-char nil s nil #\1) (read-char s) (read-char s)))
86 ;;; ... and verify that the fix does not break echo streams
87 (assert (string= (let ((out (make-string-output-stream)))
88 (with-open-stream (s (make-echo-stream
89 (make-string-input-stream "123")
92 (list (peek-char nil s nil #\1)
95 (get-output-stream-string out)))
98 ;;; 0.7.12 doesn't advance current stream in concatenated streams
99 ;;; correctly when searching a stream for a char to read.
100 (with-input-from-string (p "")
101 (with-input-from-string (q "foo")
102 (let* ((r (make-concatenated-stream p q)))
105 ;;; 0.7.14 and previous SBCLs don't have a working INTERACTIVE-STREAM-P
106 ;;; because it called UNIX-ISATTY, which wasn't defined.
107 (with-input-from-string (s "a non-interactive stream")
108 (assert (not (interactive-stream-p s))))
109 ;;; KLUDGE: Unfortunately it's hard to find a reliably interactive
110 ;;; stream to test, since it's reasonable for these tests to be run
111 ;;; from a script, conceivably even as something like a cron job.
113 #+nil (assert (eq (interactive-stream-p *terminal-io*) t))
115 ;;; MAKE-STRING-INPUT-STREAM
117 ;;; * Observe FILE-POSITION :START and :END, and allow setting of
118 ;;; FILE-POSITION beyond the end of string, signalling END-OF-FILE only
120 (let* ((string (copy-seq "abc"))
121 (stream (make-string-input-stream string)))
122 (assert (char= (read-char stream) #\a))
123 (assert (= 1 (file-position stream)))
124 (assert (file-position stream :start))
125 (assert (= 0 (file-position stream)))
126 (assert (file-position stream :end))
127 (assert (= (length string) (file-position stream)))
128 (assert (file-position stream (1- (file-position stream))))
129 (assert (char= (read-char stream) #\c))
130 (assert (file-position stream (1- (file-position stream))))
131 (assert (char= (read-char stream) #\c))
132 (assert (file-position stream :end))
133 (let ((eof (cons nil nil)))
134 (assert (eq (read-char stream nil eof) eof)))
135 (assert (file-position stream 10))
136 (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
138 (assert (typep cond 'error)))
139 (multiple-value-bind (val cond) (ignore-errors (read-char stream))
141 (assert (typep cond 'end-of-file))))
143 ;;; MAKE-STRING-OUTPUT-STREAM
145 ;;; * Observe FILE-POSITION :START and :END, and allow setting of
146 ;;; FILE-POSITION to an arbitrary index.
148 ;;; * END will always refer to the farthest position of stream so-far
149 ;;; seen, and setting FILE-POSITION beyond the current END will extend
150 ;;; the string/stream with uninitialized elements.
152 ;;; * Rewinding the stream works with overwriting semantics.
154 (let ((stream (make-string-output-stream)))
155 (princ "abcd" stream)
156 (assert (= 4 (file-position stream)))
157 (assert (file-position stream :start))
158 (assert (= 0 (file-position stream)))
160 (assert (= 1 (file-position stream)))
161 (file-position stream 2)
162 (assert (= 2 (file-position stream)))
164 (assert (file-position stream :end))
165 (assert (= 4 (file-position stream)))
166 (assert (file-position stream 6))
167 (assert (file-position stream 4))
168 (assert (file-position stream :end))
169 (assert (= 6 (file-position stream)))
170 (assert (file-position stream 4))
171 (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
173 (assert (typep cond 'error)))
175 (assert (equal "0b2d!!" (get-output-stream-string stream))))
177 ;;; WITH-OUTPUT-TO-STRING (when provided with a string argument)
179 ;;; * Observe FILE-POSITION :START and :END, and allow setting of
180 ;;; FILE-POSITION to an arbitrary index. If the new position is beyond
181 ;;; the end of string and the string is adjustable the string will be
182 ;;; implicitly extended, otherwise an error will be signalled. The
183 ;;; latter case is provided for in the code, but not currently
184 ;;; excercised since SBCL fill-pointer arrays are always (currently)
187 ;;; * END will refer to the ARRAY-TOTAL-SIZE of string, not
188 ;;; FILL-POINTER, since by definition the FILE-POSITION will always be
189 ;;; a FILL-POINTER, so that would be of limited use.
191 ;;; * Rewinding the stream works with overwriting semantics.
193 #+nil (let ((str (make-array 0
194 :element-type 'character
197 (with-output-to-string (stream str)
198 (princ "abcd" stream)
199 (assert (= 4 (file-position stream)))
200 (assert (file-position stream :start))
201 (assert (= 0 (file-position stream)))
203 (assert (= 1 (file-position stream)))
204 (file-position stream 2)
205 (assert (= 2 (file-position stream)))
207 (assert (file-position stream :end))
208 (assert (= 4 (file-position stream)))
209 (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
211 (assert (typep cond 'error)))
212 (multiple-value-bind (val cond) (ignore-errors (file-position stream 6))
214 (assert (typep cond 'error)))
215 (assert (equal "0b2d" str))))
217 (let ((str (make-array 0
218 :element-type 'character
221 (with-output-to-string (stream str)
222 (princ "abcd" stream)
223 (assert (= 4 (file-position stream)))
224 (assert (file-position stream :start))
225 (assert (= 0 (file-position stream)))
227 (assert (= 1 (file-position stream)))
228 (file-position stream 2)
229 (assert (= 2 (file-position stream)))
231 (assert (file-position stream :end))
232 (assert (= 4 (file-position stream)))
233 (assert (file-position stream 6))
234 (assert (file-position stream 4))
235 (assert (file-position stream :end))
236 (assert (= 6 (file-position stream)))
237 (assert (file-position stream 4))
238 (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
240 (assert (typep cond 'error)))
242 (assert (equal "0b2d!!" str))))
244 ;;; MAKE-STRING-OUTPUT-STREAM and WITH-OUTPUT-TO-STRING take an
245 ;;; :ELEMENT-TYPE keyword argument
246 (macrolet ((frob (element-type-form)
248 (let ((s (with-output-to-string
249 (s nil ,@(when element-type-form
250 `(:element-type ,element-type-form))))))
251 (assert (typep s '(simple-array ,(if element-type-form
252 (eval element-type-form)
255 (get-output-stream-string
256 (make-string-output-stream
257 ,@(when element-type-form
258 `(:element-type ,element-type-form)))))))
264 (with-open-file (s #-win32 "/dev/null" #+win32 "nul" :element-type '(signed-byte 48))
265 (assert (eq :eof (read-byte s nil :eof))))
267 (let* ((is (make-string-input-stream "foo"))
268 (os (make-string-output-stream))
269 (s (make-echo-stream is os))
270 (sequence (copy-seq "abcdef")))
271 (assert (= (read-sequence sequence s) 3))
272 (assert (string= sequence "foodef"))
273 (assert (string= (get-output-stream-string os) "foo")))
275 (let* ((is (make-string-input-stream "foo"))
276 (os (make-string-output-stream))
277 (s (make-echo-stream is os))
278 (sequence (copy-seq "abcdef")))
279 (assert (char= #\f (read-char s)))
280 (assert (= (read-sequence sequence s) 2))
281 (assert (string= sequence "oocdef"))
282 (assert (string= (get-output-stream-string os) "foo")))
284 (let* ((is (make-string-input-stream "foo"))
285 (os (make-string-output-stream))
286 (s (make-echo-stream is os))
287 (sequence (copy-seq "abcdef")))
288 (assert (char= #\f (read-char s)))
290 (assert (= (read-sequence sequence s) 3))
291 (assert (string= sequence "foodef"))
292 (assert (string= (get-output-stream-string os) "foo")))
294 (with-standard-io-syntax
295 (open #-win32 "/dev/null" #+win32 "nul" ))
297 ;;; PEEK-CHAR T uses whitespace[2]
298 (let ((*readtable* (copy-readtable)))
299 (assert (char= (peek-char t (make-string-input-stream " a")) #\a))
300 (set-syntax-from-char #\Space #\a)
301 (assert (char= (peek-char t (make-string-input-stream " a")) #\Space)))
303 ;;; It is actually easier to run into the problem exercised by this
304 ;;; test with sockets, due to their delays between availabilities of
305 ;;; data. However edgy the case may be for normal files, however,
306 ;;; there is still a case to be found in which CL:LISTEN answers
309 ;;; This test assumes that buffering is still done until a buffer of
310 ;;; SB-IMPL::BYTES-PER-BUFFER bytes is filled up, that the buffer may
311 ;;; immediately be completely filled for normal files, and that the
312 ;;; buffer-fill routine is responsible for figuring out when we've
314 (with-test (:name (stream listen-vs-select))
315 (let ((listen-testfile-name "stream.impure.lisp.testqfile")
316 ;; If non-NIL, size (in bytes) of the file that will exercise
317 ;; the LISTEN problem.
318 (bytes-per-buffer-sometime
319 (and (boundp 'sb-impl::bytes-per-buffer)
320 (symbol-value 'sb-impl::bytes-per-buffer))))
321 (when bytes-per-buffer-sometime
324 (with-open-file (stream listen-testfile-name
325 :direction :output :if-exists :error
326 :element-type '(unsigned-byte 8))
327 (dotimes (n bytes-per-buffer-sometime)
328 (write-byte 113 stream)))
329 (with-open-file (stream listen-testfile-name
330 :direction :input :element-type '(unsigned-byte 8))
331 (dotimes (n bytes-per-buffer-sometime)
333 (assert (not (listen stream)))))
334 (ignore-errors (delete-file listen-testfile-name))))))