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 ;;; by 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 ;; 0.7.12 doesn't advance current stream in concatenated streams
  78 ;; correctly when searching a stream for a char to read.
  79 (with-input-from-string (p "")
  80   (with-input-from-string (q "foo")
  81     (let* ((r (make-concatenated-stream p q)))
  82       (peek-char nil r))))