tests/stream.pure.lisp

   1 ;;;; tests related to Lisp streams
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   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
   8 ;;;; from CMU CL.
   9 ;;;;
  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.
  13
  14 (in-package :cl-user)
  15
  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))
  35        (max-n-to-read 24)
  36        (buffer-1 (make-string max-n-to-read))
  37        (buffer-2 (make-string max-n-to-read)))
  38   (loop
  39    (let* ((n-to-read (random max-n-to-read))
  40           (n-actually-read-1 (read-sequence buffer-1
  41                                             concatenated-stream
  42                                             :end n-to-read))
  43           (n-actually-read-2 (read-sequence buffer-2
  44                                             stream
  45                                             :end n-to-read)))
  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))
  53        (return)))))
  54
  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...
  57 (assert (string=
  58          (with-output-to-string (out)
  59            (peek-char #\]
  60                       (make-echo-stream
  61                        (make-string-input-stream "ab cd e df s]") out)))
  62          ;; (Before the fix, the result had a trailing #\] in it.)
  63          "ab cd e df s"))
  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
  67 (assert (string=
  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.)
  75          "a"))
  76
  77 ;;; Reported by Fredrik Sandstrom to sbcl-devel 2005-05-17 ("Bug in
  78 ;;; peek-char"):
  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)))
  84                '(#\1 #\1 #\2)))
  85
  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")
  90                                          out))
  91                      (format s "=>~{~A~}"
  92                              (list (peek-char nil s nil #\1)
  93                                    (read-char s)
  94                                    (read-char s)))
  95                      (get-output-stream-string out)))
  96                  "12=>112"))
  97
  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)))
 103       (peek-char nil r))))
 104
 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.
 112 ;;; Ideas?
 113 #+nil (assert (eq (interactive-stream-p *terminal-io*) t))
 114
 115 ;;; MAKE-STRING-INPUT-STREAM
 116 ;;;
 117 ;;; * Observe FILE-POSITION :START and :END, and allow setting of
 118 ;;;   FILE-POSITION beyond the end of string, signalling END-OF-FILE only
 119 ;;;   on read.
 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))
 137     (assert (null val))
 138     (assert (typep cond 'error)))
 139   (multiple-value-bind (val cond) (ignore-errors (read-char stream))
 140     (assert (null val))
 141     (assert (typep cond 'end-of-file))))
 142
 143 ;;; MAKE-STRING-OUTPUT-STREAM
 144 ;;;
 145 ;;; * Observe FILE-POSITION :START and :END, and allow setting of
 146 ;;;   FILE-POSITION to an arbitrary index.
 147 ;;;
 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.
 151 ;;;
 152 ;;; * Rewinding the stream works with overwriting semantics.
 153 ;;;
 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)))
 159   (princ "0" stream)
 160   (assert (= 1 (file-position stream)))
 161   (file-position stream 2)
 162   (assert (= 2 (file-position stream)))
 163   (princ "2" 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))
 172     (assert (null val))
 173     (assert (typep cond 'error)))
 174   (princ "!!" stream)
 175   (assert (equal "0b2d!!" (get-output-stream-string stream))))
 176
 177 ;;; WITH-OUTPUT-TO-STRING (when provided with a string argument)
 178 ;;;
 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)
 185 ;;; adjustable.
 186 ;;;
 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.
 190 ;;;
 191 ;;; * Rewinding the stream works with overwriting semantics.
 192 ;;;
 193 #+nil (let ((str (make-array 0
 194                        :element-type 'character
 195                        :adjustable nil
 196                        :fill-pointer t)))
 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)))
 202     (princ "0" stream)
 203     (assert (= 1 (file-position stream)))
 204     (file-position stream 2)
 205     (assert (= 2 (file-position stream)))
 206     (princ "2" 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))
 210       (assert (null val))
 211       (assert (typep cond 'error)))
 212     (multiple-value-bind (val cond) (ignore-errors (file-position stream 6))
 213       (assert (null val))
 214       (assert (typep cond 'error)))
 215     (assert (equal "0b2d" str))))
 216
 217 (let ((str (make-array 0
 218                        :element-type 'character
 219                        :adjustable nil
 220                        :fill-pointer t)))
 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)))
 226     (princ "0" stream)
 227     (assert (= 1 (file-position stream)))
 228     (file-position stream 2)
 229     (assert (= 2 (file-position stream)))
 230     (princ "2" 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))
 239       (assert (null val))
 240       (assert (typep cond 'error)))
 241     (princ "!!" stream)
 242     (assert (equal "0b2d!!" str))))
 243
 244 ;;; MAKE-STRING-OUTPUT-STREAM and WITH-OUTPUT-TO-STRING take an
 245 ;;; :ELEMENT-TYPE keyword argument
 246 (macrolet ((frob (element-type-form)
 247              `(progn
 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)
 253                                                        'character)
 254                                                   (0)))))
 255                 (get-output-stream-string
 256                  (make-string-output-stream
 257                   ,@(when element-type-form
 258                       `(:element-type ,element-type-form)))))))
 259   (frob nil)
 260   (frob 'character)
 261   (frob 'base-char)
 262   (frob 'nil))
 263
 264 (with-open-file (s #-win32 "/dev/null" #+win32 "nul" :element-type '(signed-byte 48))
 265   (assert (eq :eof (read-byte s nil :eof))))
 266
 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")))
 274
 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")))
 283
 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)))
 289   (unread-char #\f s)
 290   (assert (= (read-sequence sequence s) 3))
 291   (assert (string= sequence "foodef"))
 292   (assert (string= (get-output-stream-string os) "foo")))
 293
 294 (with-standard-io-syntax
 295   (open #-win32 "/dev/null" #+win32 "nul" ))
 296
 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)))
 302
 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
 307 ;;; improperly.
 308 ;;;
 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
 313 ;;; reached EOF.
 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
 322       (unwind-protect
 323            (progn
 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)
 332                  (read-byte stream))
 333                (assert (not (listen stream)))))
 334         (ignore-errors (delete-file listen-testfile-name))))))