guile/test-suite/tests/ports.test

;;;; ports.test --- Guile I/O ports.    -*- coding: utf-8; mode: scheme; -*-
;;;; Jim Blandy <jimb@red-bean.com> --- May 1999
;;;;
;;;; 	Copyright (C) 1999, 2001, 2004, 2006, 2007, 2009, 2010,
;;;;      2011, 2012, 2013, 2014, 2015, 2017, 2019, 2020, 2021 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;; 
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;;; Lesser General Public License for more details.
;;;; 
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

(define-module (test-suite test-ports)
  #:use-module (test-suite lib)
  #:use-module (test-suite guile-test)
  #:use-module (ice-9 popen)
  #:use-module (ice-9 rdelim)
  #:use-module (ice-9 threads)
  #:use-module (rnrs bytevectors)
  #:use-module ((ice-9 binary-ports) #:select (open-bytevector-input-port
                                               open-bytevector-output-port
                                               put-bytevector
                                               get-bytevector-n
                                               get-bytevector-all
                                               unget-bytevector)))

(define (display-line . args)
  (for-each display args)
  (newline))

(define (test-file)
  (data-file-name "ports-test.tmp"))


;;;; Some general utilities for testing ports.

;; Make sure we are set up for 8-bit Latin-1 data.
(fluid-set! %default-port-encoding "ISO-8859-1")
(for-each (lambda (p)
            (set-port-encoding! p (fluid-ref %default-port-encoding)))
          (list (current-input-port) (current-output-port)
                (current-error-port)))

;;; Read from PORT until EOF, and return the result as a string.
(define (read-all port)
  (let loop ((chars '()))
    (let ((char (read-char port)))
      (if (eof-object? char)
          (list->string (reverse! chars))
          (loop (cons char chars))))))

(define (read-file filename)
  (let* ((port (open-input-file filename))
         (string (read-all port)))
    (close-port port)
    string))



(with-test-prefix "%default-port-conversion-strategy"

  (pass-if "initial value"
    (eq? 'substitute (fluid-ref %default-port-conversion-strategy)))

  (pass-if "file port"
    (let ((strategies '(error substitute escape)))
      (equal? (map (lambda (s)
                     (with-fluids ((%default-port-conversion-strategy s))
                       (call-with-output-file "/dev/null"
                         (lambda (p)
                           (port-conversion-strategy p)))))
                   strategies)
              strategies)))

  (pass-if "(set-port-conversion-strategy! #f sym)"
    (begin
      (set-port-conversion-strategy! #f 'error)
      (and (eq? (fluid-ref %default-port-conversion-strategy) 'error)
           (begin
             (set-port-conversion-strategy! #f 'substitute)
             (eq? (fluid-ref %default-port-conversion-strategy)
                  'substitute)))))

)


;;;; Normal file ports.

;;; Write out an s-expression, and read it back.
(let ((string '("From fairest creatures we desire increase,"
                "That thereby beauty's rose might never die,"))
      (filename (test-file)))
  (let ((port (open-output-file filename)))
    (write string port)
    (close-port port))
  (let ((port (open-input-file filename)))
    (let ((in-string (read port)))
      (pass-if "file: write and read back list of strings" 
               (equal? string in-string)))
    (close-port port))
  (delete-file filename))

;;; Write out a string, and read it back a character at a time.
(let ((string "This is a test string\nwith no newline at the end")
      (filename (test-file)))
  (let ((port (open-output-file filename)))
    (display string port)
    (close-port port))
  (let ((in-string (read-file filename)))
    (pass-if "file: write and read back characters"
             (equal? string in-string)))
  (delete-file filename))

;;; Buffered input/output port with seeking.
(let* ((filename (test-file))
       (port (open-file filename "w+")))
  (display "J'Accuse" port)
  (seek port -1 SEEK_CUR)
  (pass-if "file: r/w 1"
           (char=? (read-char port) #\e))
  (pass-if "file: r/w 2"
           (eof-object? (read-char port)))
  (seek port -1 SEEK_CUR)
  (write-char #\x port)
  (seek port 7 SEEK_SET)
  (pass-if "file: r/w 3"
           (char=? (read-char port) #\x))
  (seek port -2 SEEK_END)
  (pass-if "file: r/w 4"
           (char=? (read-char port) #\s))
  (close-port port)
  (delete-file filename))

;;; Unbuffered input/output port with seeking.
(let* ((filename (test-file))
       (port (open-file filename "w+0")))
  (display "J'Accuse" port)
  (seek port -1 SEEK_CUR)
  (pass-if "file: ub r/w 1"
           (char=? (read-char port) #\e))
  (pass-if "file: ub r/w 2"
           (eof-object? (read-char port)))
  (seek port -1 SEEK_CUR)
  (write-char #\x port)
  (seek port 7 SEEK_SET)
  (pass-if "file: ub r/w 3"
           (char=? (read-char port) #\x))
  (seek port -2 SEEK_END)
  (pass-if "file: ub r/w 4"
           (char=? (read-char port) #\s))
  (close-port port)
  (delete-file filename))

;;; Buffered output-only and input-only ports with seeking.
(let* ((filename (test-file))
       (port (open-output-file filename)))
  (display "J'Accuse" port)
  (pass-if "file: out tell"
           (= (seek port 0 SEEK_CUR) 8))
  (seek port -1 SEEK_CUR)
  (write-char #\x port)
  (close-port port)
  (let ((iport (open-input-file filename)))
    (pass-if "file: in tell 0"
             (= (seek iport 0 SEEK_CUR) 0))
    (read-char iport)
    (pass-if "file: in tell 1"
             (= (seek iport 0 SEEK_CUR) 1))
    (unread-char #\z iport)
    (pass-if "file: in tell 0 after unread"
             (= (seek iport 0 SEEK_CUR) 0))
    (pass-if "file: unread char still there"
             (char=? (read-char iport) #\z))
    (seek iport 7 SEEK_SET)
    (pass-if "file: in last char"
             (char=? (read-char iport) #\x))
    (close-port iport))
  (delete-file filename))

;;; unusual characters.
(let* ((filename (test-file))
       (port (open-output-file filename)))
  (display (string #\nul (integer->char 255) (integer->char 128)
                   #\nul) port)
  (close-port port)
  (let* ((port (open-input-file filename))
         (line (read-line port)))
    (pass-if "file: read back NUL 1"
             (char=? (string-ref line 0) #\nul))
    (pass-if "file: read back 255"
             (char=? (string-ref line 1) (integer->char 255)))
    (pass-if "file: read back 128"
             (char=? (string-ref line 2) (integer->char 128)))
    (pass-if "file: read back NUL 2"
             (char=? (string-ref line 3) #\nul))
    (pass-if "file: EOF"
             (eof-object? (read-char port)))
    (close-port port))
  (delete-file filename))

;;; line buffering mode.
(let* ((filename (test-file))
       (port (open-file filename "wl"))
       (test-string "one line more or less"))
  (write-line test-string port)
  (let* ((in-port (open-input-file filename))
         (line (read-line in-port)))
    (close-port in-port)
    (close-port port)
    (pass-if "file: line buffering"
             (string=? line test-string)))
  (delete-file filename))

;;; read-line should use the port encoding (not the locale encoding).
(let ((str "ĉu bone?"))
  (with-locale "C"
               (let* ((filename (test-file))
                      (port (open-file filename "wl")))
                 (set-port-encoding! port "UTF-8")
                 (write-line str port)
                 (let ((in-port (open-input-file filename)))
                   (set-port-encoding! in-port "UTF-8")
                   (let ((line (read-line in-port)))
                     (close-port in-port)
                     (close-port port)
                     (pass-if "file: read-line honors port encoding"
                              (string=? line str))))
                 (delete-file filename))))

;;; binary mode ignores port encoding
(pass-if "file: binary mode ignores port encoding"
  (with-fluids ((%default-port-encoding "UTF-8"))
               (let* ((filename (test-file))
                      (port (open-file filename "w"))
                      (test-string "一二三")
                      (binary-test-string
                       (apply string
                              (map integer->char
                                   (array->list
                                    (string->utf8 test-string))))))
                 (write-line test-string port)
                 (close-port port)
                 (let* ((in-port (open-file filename "rb"))
                        (line (read-line in-port)))
                   (close-port in-port)
                   (delete-file filename)
                   (string=? line binary-test-string)))))

;;; binary mode ignores file coding declaration
(pass-if "file: binary mode ignores file coding declaration"
  (with-fluids ((%default-port-encoding "UTF-8"))
               (let* ((filename (test-file))
                      (port (open-file filename "w"))
                      (test-string "一二三")
                      (binary-test-string
                       (apply string
                              (map integer->char
                                   (array->list
                                    (string->utf8 test-string))))))
                 (write-line ";; coding: utf-8" port)
                 (write-line test-string port)
                 (close-port port)
                 (let* ((in-port (open-file filename "rb"))
                        (line1 (read-line in-port))
                        (line2 (read-line in-port)))
                   (close-port in-port)
                   (delete-file filename)
                   (string=? line2 binary-test-string)))))

;; open-file ignores file coding declaration by default
(pass-if "file: open-file ignores coding declaration by default"
  (with-fluids ((%default-port-encoding "UTF-8"))
               (let* ((filename (test-file))
                      (port (open-output-file filename))
                      (test-string "€100"))
                 (write-line ";; coding: iso-8859-15" port)
                 (write-line test-string port)
                 (close-port port)
                 (let* ((in-port (open-input-file filename))
                        (line1 (read-line in-port))
                        (line2 (read-line in-port)))
                   (close-port in-port)
                   (delete-file filename)
                   (string=? line2 test-string)))))

;; open-input-file with guess-encoding honors coding declaration
(pass-if "file: open-input-file with guess-encoding honors coding declaration"
  (with-fluids ((%default-port-encoding "UTF-8"))
               (let* ((filename (test-file))
                      (port (open-output-file filename))
                      (test-string "€100"))
                 (set-port-encoding! port "iso-8859-15")
                 (write-line ";; coding: iso-8859-15" port)
                 (write-line test-string port)
                 (close-port port)
                 (let* ((in-port (open-input-file filename
                                                  #:guess-encoding #t))
                        (line1 (read-line in-port))
                        (line2 (read-line in-port)))
                   (close-port in-port)
                   (delete-file filename)
                   (string=? line2 test-string)))))

(pass-if-exception "invalid wide mode string"
    exception:out-of-range
  (open-file "/dev/null" "λ"))

(pass-if "valid wide mode string"
  ;; Pass 'open-file' a valid mode string, but as a wide string.
  (let ((mode (string-copy "λ")))
    (string-set! mode 0 #\r)
    (let ((port (open-file "/dev/null" mode)))
      (and (input-port? port)
           (begin
             (close-port port)
             #t)))))

(with-test-prefix "keyword arguments for file openers"
  (with-fluids ((%default-port-encoding "UTF-8"))
    (let ((filename (test-file)))

      (with-test-prefix "write #:encoding"

        (pass-if-equal "open-file"
            #vu8(116 0 101 0 115 0 116 0)
            (let ((port (open-file filename "w"
                                   #:encoding "UTF-16LE")))
              (display "test" port)
              (close-port port))
            (let* ((port (open-file filename "rb"))
                   (bv (get-bytevector-all port)))
              (close-port port)
              bv))

        (pass-if-equal "open-output-file"
            #vu8(116 0 101 0 115 0 116 0)
            (let ((port (open-output-file filename
                                          #:encoding "UTF-16LE")))
              (display "test" port)
              (close-port port))
            (let* ((port (open-file filename "rb"))
                   (bv (get-bytevector-all port)))
              (close-port port)
              bv))

        (pass-if-equal "call-with-output-file"
            #vu8(116 0 101 0 115 0 116 0)
            (call-with-output-file filename
              (lambda (port)
                (display "test" port))
              #:encoding "UTF-16LE")
            (let* ((port (open-file filename "rb"))
                   (bv (get-bytevector-all port)))
              (close-port port)
              bv))

        (pass-if-equal "with-output-to-file"
            #vu8(116 0 101 0 115 0 116 0)
            (with-output-to-file filename
              (lambda ()
                (display "test"))
              #:encoding "UTF-16LE")
            (let* ((port (open-file filename "rb"))
                   (bv (get-bytevector-all port)))
              (close-port port)
              bv))

        (pass-if-equal "with-error-to-file"
            #vu8(116 0 101 0 115 0 116 0)
            (with-error-to-file
             filename
             (lambda ()
               (display "test" (current-error-port)))
             #:encoding "UTF-16LE")
            (let* ((port (open-file filename "rb"))
                   (bv (get-bytevector-all port)))
              (close-port port)
              bv)))

      (with-test-prefix "write #:binary"

        (pass-if-equal "open-output-file"
            "ISO-8859-1"
          (let* ((port (open-output-file filename #:binary #t))
                 (enc (port-encoding port)))
            (close-port port)
            enc))

        (pass-if-equal "call-with-output-file"
            "ISO-8859-1"
          (call-with-output-file filename port-encoding #:binary #t))

        (pass-if-equal "with-output-to-file"
            "ISO-8859-1"
          (with-output-to-file filename
            (lambda () (port-encoding (current-output-port)))
            #:binary #t))

        (pass-if-equal "with-error-to-file"
            "ISO-8859-1"
          (with-error-to-file
           filename
           (lambda () (port-encoding (current-error-port)))
           #:binary #t)))

      (with-test-prefix "read #:encoding"

        (pass-if-equal "open-file read #:encoding"
            "test"
          (call-with-output-file filename
            (lambda (port)
              (put-bytevector port #vu8(116 0 101 0 115 0 116 0))))
          (let* ((port (open-file filename "r" #:encoding "UTF-16LE"))
                 (str  (read-string port)))
            (close-port port)
            str))

        (pass-if-equal "open-input-file #:encoding"
            "test"
          (call-with-output-file filename
            (lambda (port)
              (put-bytevector port #vu8(116 0 101 0 115 0 116 0))))
          (let* ((port (open-input-file filename #:encoding "UTF-16LE"))
                 (str  (read-string port)))
            (close-port port)
            str))

        (pass-if-equal "call-with-input-file #:encoding"
            "test"
          (call-with-output-file filename
            (lambda (port)
              (put-bytevector port #vu8(116 0 101 0 115 0 116 0))))
          (call-with-input-file filename
            read-string
            #:encoding "UTF-16LE"))

        (pass-if-equal "with-input-from-file #:encoding"
            "test"
          (call-with-output-file filename
            (lambda (port)
              (put-bytevector port #vu8(116 0 101 0 115 0 116 0))))
          (with-input-from-file filename
            read-string
            #:encoding "UTF-16LE")))

      (with-test-prefix "read #:binary"

        (pass-if-equal "open-input-file"
            "ISO-8859-1"
          (let* ((port (open-input-file filename #:binary #t))
                 (enc (port-encoding port)))
            (close-port port)
            enc))

        (pass-if-equal "call-with-input-file"
            "ISO-8859-1"
          (call-with-input-file filename port-encoding #:binary #t))

        (pass-if-equal "with-input-from-file"
            "ISO-8859-1"
          (with-input-from-file filename
            (lambda () (port-encoding (current-input-port)))
            #:binary #t)))

      (with-test-prefix "#:guess-encoding with coding declaration"

        (pass-if-equal "open-file"
            "€100"
          (with-output-to-file filename
            (lambda ()
              (write-line "test")
              (write-line "; coding: ISO-8859-15")
              (write-line "€100"))
            #:encoding "ISO-8859-15")
          (let* ((port (open-file filename "r"
                                  #:guess-encoding #t
                                  #:encoding "UTF-16LE"))
                 (str (begin (read-line port)
                             (read-line port)
                             (read-line port))))
            (close-port port)
            str))

        (pass-if-equal "open-input-file"
            "€100"
          (with-output-to-file filename
            (lambda ()
              (write-line "test")
              (write-line "; coding: ISO-8859-15")
              (write-line "€100"))
            #:encoding "ISO-8859-15")
          (let* ((port (open-input-file filename
                                        #:guess-encoding #t
                                        #:encoding "UTF-16LE"))
                 (str (begin (read-line port)
                             (read-line port)
                             (read-line port))))
            (close-port port)
            str))

        (pass-if-equal "call-with-input-file"
            "€100"
          (with-output-to-file filename
            (lambda ()
              (write-line "test")
              (write-line "; coding: ISO-8859-15")
              (write-line "€100"))
            #:encoding "ISO-8859-15")
          (call-with-input-file filename
            (lambda (port)
              (read-line port)
              (read-line port)
              (read-line port))
            #:guess-encoding #t
            #:encoding "UTF-16LE"))

        (pass-if-equal "with-input-from-file"
            "€100"
          (with-output-to-file filename
            (lambda ()
              (write-line "test")
              (write-line "; coding: ISO-8859-15")
              (write-line "€100"))
            #:encoding "ISO-8859-15")
          (with-input-from-file filename
            (lambda ()
              (read-line)
              (read-line)
              (read-line))
            #:guess-encoding #t
            #:encoding "UTF-16LE")))

      (with-test-prefix "#:guess-encoding without coding declaration"

        (pass-if-equal "open-file"
            "€100"
          (with-output-to-file filename
            (lambda () (write-line "€100"))
            #:encoding "ISO-8859-15")
          (let* ((port (open-file filename "r"
                                  #:guess-encoding #t
                                  #:encoding "ISO-8859-15"))
                 (str (read-line port)))
            (close-port port)
            str))

        (pass-if-equal "open-input-file"
            "€100"
          (with-output-to-file filename
            (lambda () (write-line "€100"))
            #:encoding "ISO-8859-15")
          (let* ((port (open-input-file filename
                                        #:guess-encoding #t
                                        #:encoding "ISO-8859-15"))
                 (str (read-line port)))
            (close-port port)
            str))

        (pass-if-equal "call-with-input-file"
            "€100"
          (with-output-to-file filename
            (lambda () (write-line "€100"))
            #:encoding "ISO-8859-15")
          (call-with-input-file filename
            read-line
            #:guess-encoding #t
            #:encoding "ISO-8859-15"))

        (pass-if-equal "with-input-from-file"
            "€100"
          (with-output-to-file filename
            (lambda () (write-line "€100"))
            #:encoding "ISO-8859-15")
          (with-input-from-file filename
            read-line
            #:guess-encoding #t
            #:encoding "ISO-8859-15")))

      (delete-file filename))))

;;; ungetting characters and strings.
(with-input-from-string "walk on the moon\nmoon"
                        (lambda ()
                          (read-char)
                          (unread-char #\a (current-input-port))
                          (pass-if "unread-char"
                                   (char=? (read-char) #\a))
                          (read-line)
                          (let ((replacenoid "chicken enchilada"))
                            (unread-char #\newline (current-input-port))
                            (unread-string replacenoid (current-input-port))
                            (pass-if "unread-string"
                                     (string=? (read-line) replacenoid)))
                          (pass-if "unread residue"
                                   (string=? (read-line) "moon"))))

(pass-if-equal "initial revealed count"    ;<https://bugs.gnu.org/41204>
    0
  (let* ((port     (open-input-file "/dev/null"))
         (revealed (port-revealed port)))
    (close-port port)
    revealed))

(pass-if-equal "non-revealed port is closed"
    EBADF
  (let* ((port (open-input-file "/dev/null"))
         (fdes (fileno port)))          ;leaves revealed count unchanged
    (unless (zero? (port-revealed port))
      (error "wrong revealed count" (port-revealed port)))

    (set! port #f)
    (gc)
    (catch 'system-error
      (lambda ()
        (seek fdes 0 SEEK_CUR)

        ;; If we get here, it might be because PORT was not GC'd, we
        ;; don't know, and we can't use a guardian because it would keep
        ;; PORT alive, and we can't close the descriptor because
        ;; subseuqent opens may re-use it, and then if this port is
        ;; garbage collected, it'll close the descriptor unexpectedly.
        (throw 'unresolved))
      (lambda args
        (system-error-errno args)))))

(pass-if-equal "close-port & revealed port"
    EBADF
  (let* ((port (open-file "/dev/null" "r0"))
         (fdes (port->fdes port)))    ;increments revealed count of PORT
    (unless (= 1 (port-revealed port))
      (error "wrong revealed count" (port-revealed port)))
    (close-port port)                 ;closes FDES as a side-effect
    (catch 'system-error
      (lambda ()
        (seek fdes 0 SEEK_CUR)
        #f)
      (lambda args
        (system-error-errno args)))))

(pass-if "revealed port fdes not closed"
  (let* ((port (open-file "/dev/null" "r0"))
         (fdes (port->fdes port)))
    (unless (= 1 (port-revealed port))
      (error "wrong revealed count" (port-revealed port)))

    (set! port #f)
    (gc)

    ;; Note: We can't know for sure whether PORT was GC'd; using a
    ;; guardian is not an option because it would keep it alive.
    (and (zero? (seek fdes 0 SEEK_CUR))
         (begin
           (close-fdes fdes)
           #t))))

(when (and (provided? 'threads) (provided? 'fcntl))
  (let* ((p (pipe))
         (r (car p))
         (w (cdr p)))
    (fcntl r F_SETFL (logior (fcntl r F_GETFL) O_NONBLOCK))
    (let ((thread (call-with-new-thread
                   (lambda ()
                     (usleep (* 250 1000))
                     (write-char #\a w)
                     (force-output w)))))
      (pass-if-equal "non-blocking-I/O" #\a (read-char r))
      (join-thread thread))))


;;;; Pipe (popen) ports.

;;; Run a command, and read its output.
(let* ((pipe (open-pipe "echo 'Howdy there, partner!'" "r"))
       (in-string (read-all pipe)))
  (close-pipe pipe)
  (pass-if "pipe: read"
           (equal? in-string "Howdy there, partner!\n")))

;;; Run a command, send some output to it, and see if it worked.
(let* ((filename (test-file))
       (pipe (open-pipe (string-append "grep Mommy > " filename) "w")))
  (display "Now Jimmy lives on a mushroom cloud\n" pipe)
  (display "Mommy, why does everybody have a bomb?\n" pipe)
  (close-pipe pipe)
  (let ((in-string (read-file filename)))
    (pass-if "pipe: write"
             (equal? in-string "Mommy, why does everybody have a bomb?\n")))
  (delete-file filename))

(pass-if-equal "pipe, fdopen, and line buffering"
    "foo\nbar\n"
  (unless (provided? 'fork)
          (throw 'unresolved))
  (let ((in+out (pipe))
        (pid    (primitive-fork)))
    (if (zero? pid)
        (dynamic-wind
          (const #t)
          (lambda ()
            (close-port (car in+out))
            (let ((port (cdr in+out)))
              (setvbuf port 'line )
              ;; Strings containing '\n' or should be flushed; others
              ;; should be kept in PORT's buffer.
              (display "foo\n" port)
              (display "bar\n" port)
              (display "this will be kept in PORT's buffer" port)))
          (lambda ()
            (primitive-_exit 0)))
        (begin
          (close-port (cdr in+out))
          (let ((str (read-all (car in+out))))
            (waitpid pid)
            str)))))


;;;; Void ports.  These are so trivial we don't test them.


;;;; String ports.

(with-test-prefix "string ports"

  ;; Write text to a string port.
  (let* ((string "Howdy there, partner!")
         (in-string (call-with-output-string
                     (lambda (port)
                       (display string port)
                       (newline port)))))
    (pass-if "display text"
             (equal? in-string (string-append string "\n"))))

  ;; Write an s-expression to a string port.
  (let* ((sexpr '("more utterly random text" 1729 #(a vector) 3.1415926))
         (in-sexpr
          (call-with-input-string (call-with-output-string
                                   (lambda (port)
                                     (write sexpr port)))
                                  read)))
    (pass-if "write/read sexpr"
             (equal? in-sexpr sexpr)))

  ;; seeking and unreading from an input string.
  (let ((text "that text didn't look random to me"))
    (call-with-input-string text
                            (lambda (p)
                              (pass-if "input tell 0"
                                       (= (seek p 0 SEEK_CUR) 0))
                              (read-char p)
                              (pass-if "input tell 1"
                                       (= (seek p 0 SEEK_CUR) 1))
                              (unread-char #\x p)
                              (pass-if "input tell back to 0"
                                       (= (seek p 0 SEEK_CUR) 0))
                              (pass-if "input ungetted char"
                                       (char=? (read-char p) #\x))
                              (seek p 0 SEEK_END)
                              (pass-if "input seek to end"
                                       (= (seek p 0 SEEK_CUR)
                                          (string-length text)))
                              (unread-char #\x p)
                              (pass-if "input seek to beginning"
                                       (= (seek p 0 SEEK_SET) 0))
                              (pass-if "input reread first char"
                                       (char=? (read-char p)
                                               (string-ref text 0))))))

  ;; seeking an output string.
  (let* ((text (string-copy "123456789"))
         (len (string-length text))
         (result (call-with-output-string
                  (lambda (p)
                    (pass-if "output tell 0"
                             (= (seek p 0 SEEK_CUR) 0))
                    (display text p)
                    (pass-if "output tell end"
                             (= (seek p 0 SEEK_CUR) len))
                    (pass-if "output seek to beginning"
                             (= (seek p 0 SEEK_SET) 0))
                    (write-char #\a p)
                    (seek p -1 SEEK_END)
                    (pass-if "output seek to last char"
                             (= (seek p 0 SEEK_CUR)
                                (- len 1)))
                    (write-char #\b p)))))
    (string-set! text 0 #\a)
    (string-set! text (- len 1) #\b)
    (pass-if "output check"
             (string=? text result)))

  (pass-if-exception "truncating input string fails"
      exception:wrong-type-arg
    (call-with-input-string "hej"
      (lambda (p)
        (truncate-file p 0))))

  (pass-if-equal "truncating output string" "hej"
    (call-with-output-string
      (lambda (p)
        (truncate-file p 0)
        (display "hej" p))))

  (pass-if-exception "truncating output string before position"
      exception:out-of-range
    (call-with-output-string
      (lambda (p)
        (display "hej" p)
        (truncate-file p 0))))

  (pass-if-equal "truncating output string at position" "hej"
    (call-with-output-string
      (lambda (p)
        (display "hej" p)
        (truncate-file p 3))))

  (pass-if-equal "truncating output string after seek" ""
    (call-with-output-string
      (lambda (p)
        (display "hej" p)
        (seek p 0 SEEK_SET)
        (truncate-file p 0))))

  (pass-if-equal "truncating output string after seek to end" "hej"
    (call-with-output-string
      (lambda (p)
        (display "hej" p)
        (seek p 0 SEEK_SET)
        (truncate-file p 3))))

  (pass-if "%default-port-encoding is ignored"
    (let ((str "ĉu bone?"))
      ;; Latin-1 cannot represent ‘ĉ’.
      (with-fluids ((%default-port-encoding "ISO-8859-1"))
        (string=? (call-with-output-string
                   (lambda (p)
                     (set-port-conversion-strategy! p 'substitute)
                     (display str p)))
                  "ĉu bone?"))))

  (pass-if "%default-port-conversion-strategy is honored"
    (let ((strategies '(error substitute escape)))
      (equal? (map (lambda (s)
                     (with-fluids ((%default-port-conversion-strategy s))
                       (call-with-output-string
                        (lambda (p)
                          (and (eq? s (port-conversion-strategy p))
                               (begin
                                 (set-port-conversion-strategy! p s)
                                 (display (port-conversion-strategy p)
                                          p)))))))
                   strategies)
              (map symbol->string strategies))))

  (pass-if "suitable encoding [latin-1]"
    (let ((str "hello, world")
          (encoding "ISO-8859-1"))
      (equal? str
              (call-with-output-string
               (lambda (p)
                 (set-port-encoding! p encoding)
                 (display str p))))))

  (pass-if "suitable encoding [latin-3]"
    (let ((str "ĉu bone?")
          (encoding "ISO-8859-3"))
      (equal? str
              (call-with-output-string
               (lambda (p)
                 (set-port-encoding! p encoding)
                 (display str p))))))

  (pass-if "wrong encoding, error"
    (let ((str "ĉu bone?"))
      (catch 'encoding-error
        (lambda ()
          (with-fluids ((%default-port-conversion-strategy 'error))
            (call-with-output-string
             (lambda (p)
               ;; Latin-1 cannot represent ‘ĉ’.
               (set-port-encoding! p "ISO-8859-1")
               (display str p))))
          #f)                           ; so the test really fails here
        (lambda (key subr message errno port chr)
          (and (eqv? chr #\ĉ)
               (string? (strerror errno)))))))

  (pass-if "wrong encoding, substitute"
    (let ((str "ĉu bone?"))
      (string=? (call-with-output-string
                 (lambda (p)
                   (set-port-encoding! p "ISO-8859-1")
                   (set-port-conversion-strategy! p 'substitute)
                   (display str p)))
                "?u bone?")))

  (pass-if "wrong encoding, escape"
    (let ((str "ĉu bone?"))
      (string=? (call-with-output-string
                 (lambda (p)
                   (set-port-encoding! p "ISO-8859-1")
                   (set-port-conversion-strategy! p 'escape)
                   (display str p)))
                "\\u0109u bone?")))

  (pass-if "peek-char"
    (let ((p (open-input-string "안녕하세요")))
      (and (char=? (peek-char p) #\안)
           (char=? (peek-char p) #\안)
           (char=? (peek-char p) #\안)
           (= (port-line p) 0)
           (= (port-column p) 0))))

  ;; Mini DSL to test decoding error handling.
  (letrec-syntax ((decoding-error?
                   (syntax-rules ()
                     ((_ port proc)
                      (catch 'decoding-error
                        (lambda ()
                          (pk 'proc (proc port))
                          #f)
                        (lambda (key subr message errno p)
                          (define (skip-over-error)
                            (let ((strategy (port-conversion-strategy p)))
                              (set-port-conversion-strategy! p 'substitute)
                              ;; If `proc' is `read-char', this will
                              ;; skip over the bad bytes.
                              (let ((c (proc p)))
                                (unless (eqv? c #\xFFFD)
                                  (error "unexpected char" c))
                                (set-port-conversion-strategy! p strategy)
                                #t)))
                          (and (eq? p port)
                               (not (= 0 errno))
                               (skip-over-error)))))))
                  (make-check
                   (syntax-rules (-> error eof)
                     ((_ port (proc -> error))
                      (if (eq? 'substitute
                               (port-conversion-strategy port))
                          (eqv? (proc port) #\xFFFD)
                          (decoding-error? port proc)))
                     ((_ port (proc -> eof))
                      (eof-object? (proc port)))
                     ((_ port (proc -> char))
                      (eqv? (proc port) char))))
                  (make-checks
                   (syntax-rules ()
                     ((_ port check ...)
                      (and (make-check port check) ...))))
                  (make-peek+read-checks
                   (syntax-rules ()
                     ((_ port (result ...) e1 expected ...)
                      (make-peek+read-checks port
                                             (result ...
                                                     (peek-char -> e1)
                                                     (read-char -> e1))
                                             expected ...))
                     ((_ port (result ...))
                      (make-checks port result ...))
                     ((_ port #f e1 expected ...)
                      (make-peek+read-checks port
                                             ((peek-char -> e1)
                                              (read-char -> e1))
                                             expected ...))))

                  (test-decoding-error*
                      (syntax-rules ()
                        ((_ sequence encoding strategy (expected ...))
                         (begin
                          (pass-if (format #f "test-decoding-error: ~s ~s ~s"
                                           'sequence encoding strategy)
                            (let ((p (open-bytevector-input-port
                                      (u8-list->bytevector 'sequence))))
                              (set-port-encoding! p encoding)
                              (set-port-conversion-strategy! p strategy)
                              (make-checks p
                                           (read-char -> expected) ...)))

                          ;; Generate the same test, but with one
                          ;; `peek-char' call before each `read-char'.
                          ;; Both should yield the same result.
                          (pass-if (format #f "test-decoding-error: ~s ~s ~s + peek-char"
                                           'sequence encoding strategy)
                            (let ((p (open-bytevector-input-port
                                      (u8-list->bytevector 'sequence))))
                              (set-port-encoding! p encoding)
                              (set-port-conversion-strategy! p strategy)
                              (make-peek+read-checks p #f expected
                                                     ...)))))))
                  (test-decoding-error
                      (syntax-rules ()
                        ((_ sequence encoding (expected ...))
                         (begin
                           (test-decoding-error* sequence encoding 'error
                             (expected ...))

                           ;; `escape' should behave exactly like `error'.
                           (test-decoding-error* sequence encoding 'escape
                             (expected ...))

                           (test-decoding-error* sequence encoding 'substitute
                             (expected ...)))))))

    (test-decoding-error (255 65 66 67) "UTF-8"
      (error #\A #\B #\C eof))

    (test-decoding-error (255 206 187 206 188) "UTF-8"
      (error #\λ #\μ eof))

    (test-decoding-error (206 187 206) "UTF-8"
      ;; Unterminated sequence.
      (#\λ error eof))

    ;; Check how ill-formed UTF-8 sequences are handled (see Table 3-7
    ;; of the "Conformance" chapter of Unicode 6.0.0.)

    (test-decoding-error (#xc0 #x80 #x41) "UTF-8"
      (error                ;; C0: should be in the C2..DF range
       error                ;; 80: invalid
       #\A
       eof))

    (test-decoding-error (#xc2 #x41 #x42) "UTF-8"
      ;; Section 3.9 of Unicode 6.0.0 reads:
      ;;   "If the converter encounters an ill-formed UTF-8 code unit
      ;;   sequence which starts with a valid first byte, but which does
      ;;   not continue with valid successor bytes (see Table 3-7), it
      ;;   must not consume the successor bytes".
      ;; Glibc/libiconv do not conform to it and instead swallow the
      ;; #x41.  This example appears literally in Section 3.9.
      (error                ;; 41: invalid successor
       #\A                  ;; 41: valid starting byte
       #\B
       eof))

    (test-decoding-error (#xf0 #x80 #x80 #x41) "UTF-8"
      ;; According to Unicode 6.0.0, Section 3.9, "the only formal
      ;; requirement mandated by Unicode conformance for a converter is
      ;; that the <41> be processed and correctly interpreted as
      ;; <U+0041>".
      (error                ;; 2nd byte should be in the A0..BF range
       error                ;; 80: not a valid starting byte
       error                ;; 80: not a valid starting byte
       #\A
       eof))

    (test-decoding-error (#xe0 #xa0 #x41 #x42) "UTF-8"
      (error                ;; 3rd byte should be in the 80..BF range
       #\A
       #\B
       eof))

    (test-decoding-error (#xf0 #x88 #x88 #x88) "UTF-8"
      (error                ;; 2nd byte should be in the 90..BF range
       error                ;; 88: not a valid starting byte
       error                ;; 88: not a valid starting byte
       error                ;; 88: not a valid starting byte
       eof))))

(with-test-prefix "call-with-output-string"

  ;; In Guile 1.6.4, closing the port resulted in a segv, check that doesn't
  ;; occur.
  (pass-if-exception "proc closes port" exception:wrong-type-arg
    (call-with-output-string close-port)))



;;;; Soft ports.  No tests implemented yet.


;;;; Generic operations across all port types.

(let ((port-loop-temp (test-file)))

  ;; Return a list of input ports that all return the same text.
  ;; We map tests over this list.
  (define (input-port-list text)

    ;; Create a text file some of the ports will use.
    (let ((out-port (open-output-file port-loop-temp)))
      (display text out-port)
      (close-port out-port))

    (list (open-input-file port-loop-temp)
          (open-input-pipe (string-append "cat " port-loop-temp))
          (call-with-input-string text (lambda (x) x))
          ;; We don't test soft ports at the moment.
          ))

  (define port-list-names '("file" "pipe" "string"))

  ;; Test the line counter.
  (define (test-line-counter text second-line final-column)
    (with-test-prefix "line counter"
      (let ((ports (input-port-list text)))
        (for-each
         (lambda (port port-name)
           (with-test-prefix port-name
             (pass-if "at beginning of input"
                      (= (port-line port) 0))
             (pass-if "read first character"
                      (eqv? (read-char port) #\x))
             (pass-if "after reading one character"
                      (= (port-line port) 0))
             (pass-if "read first newline"
                      (eqv? (read-char port) #\newline))
             (pass-if "after reading first newline char"
                      (= (port-line port) 1))
             (pass-if "second line read correctly"
                      (equal? (read-line port) second-line))
             (pass-if "read-line increments line number"
                      (= (port-line port) 2))
             (pass-if "read-line returns EOF"
                      (let loop ((i 0))
                        (cond
                         ((eof-object? (read-line port)) #t)
                         ((> i 20) #f)
                         (else (loop (+ i 1))))))
             (pass-if "line count is 5 at EOF"
                      (= (port-line port) 5))
             (pass-if "column is correct at EOF"
                      (= (port-column port) final-column))))
         ports port-list-names)
        (for-each close-port ports)
        (delete-file port-loop-temp))))

  (with-test-prefix "newline"
    (test-line-counter
     (string-append "x\n"
                    "He who receives an idea from me, receives instruction\n"
                    "himself without lessening mine; as he who lights his\n"
                    "taper at mine, receives light without darkening me.\n"
                    "  --- Thomas Jefferson\n")
     "He who receives an idea from me, receives instruction"
     0))

  (with-test-prefix "no newline"
    (test-line-counter
     (string-append "x\n"
                    "He who receives an idea from me, receives instruction\n"
                    "himself without lessening mine; as he who lights his\n"
                    "taper at mine, receives light without darkening me.\n"
                    "  --- Thomas Jefferson\n"
                    "no newline here")
     "He who receives an idea from me, receives instruction"
     15)))

;; Test port-line and port-column for output ports

(define (test-output-line-counter text final-column)
  (with-test-prefix "port-line and port-column for output ports"
    (let ((port (open-output-string)))
      (pass-if "at beginning of input"
               (and (= (port-line port) 0)
                    (= (port-column port) 0)))
      (write-char #\x port)
      (pass-if "after writing one character"
               (and (= (port-line port) 0)
                    (= (port-column port) 1)))
      (write-char #\newline port)
      (pass-if "after writing first newline char"
               (and (= (port-line port) 1)
                    (= (port-column port) 0)))
      (display text port)
      (pass-if "line count is 5 at end"
               (= (port-line port) 5))
      (pass-if "column is correct at end"
               (= (port-column port) final-column)))))

(test-output-line-counter
 (string-append "He who receives an idea from me, receives instruction\n"
                "himself without lessening mine; as he who lights his\n"
                "taper at mine, receives light without darkening me.\n"
                "  --- Thomas Jefferson\n"
                "no newline here")
 15)

(with-test-prefix "port-column"

  (with-test-prefix "output"

    (pass-if "x"
      (let ((port (open-output-string)))
        (display "x" port)
        (= 1 (port-column port))))

    (pass-if "\\a"
      (let ((port (open-output-string)))
        (display "\a" port)
        (= 0 (port-column port))))

    (pass-if "x\\a"
      (let ((port (open-output-string)))
        (display "x\a" port)
        (= 1 (port-column port))))

    (pass-if "\\x08 backspace"
      (let ((port (open-output-string)))
        (display "\x08" port)
        (= 0 (port-column port))))

    (pass-if "x\\x08 backspace"
      (let ((port (open-output-string)))
        (display "x\x08" port)
        (= 0 (port-column port))))

    (pass-if "\\n"
      (let ((port (open-output-string)))
        (display "\n" port)
        (= 0 (port-column port))))

    (pass-if "x\\n"
      (let ((port (open-output-string)))
        (display "x\n" port)
        (= 0 (port-column port))))

    (pass-if "\\r"
      (let ((port (open-output-string)))
        (display "\r" port)
        (= 0 (port-column port))))

    (pass-if "x\\r"
      (let ((port (open-output-string)))
        (display "x\r" port)
        (= 0 (port-column port))))

    (pass-if "\\t"
      (let ((port (open-output-string)))
        (display "\t" port)
        (= 8 (port-column port))))

    (pass-if "x\\t"
      (let ((port (open-output-string)))
        (display "x\t" port)
        (= 8 (port-column port)))))

  (with-test-prefix "input"

    (pass-if "x"
      (let ((port (open-input-string "x")))
        (while (not (eof-object? (read-char port))))
        (= 1 (port-column port))))

    (pass-if "\\a"
      (let ((port (open-input-string "\a")))
        (while (not (eof-object? (read-char port))))
        (= 0 (port-column port))))

    (pass-if "x\\a"
      (let ((port (open-input-string "x\a")))
        (while (not (eof-object? (read-char port))))
        (= 1 (port-column port))))

    (pass-if "\\x08 backspace"
      (let ((port (open-input-string "\x08")))
        (while (not (eof-object? (read-char port))))
        (= 0 (port-column port))))

    (pass-if "x\\x08 backspace"
      (let ((port (open-input-string "x\x08")))
        (while (not (eof-object? (read-char port))))
        (= 0 (port-column port))))

    (pass-if "\\n"
      (let ((port (open-input-string "\n")))
        (while (not (eof-object? (read-char port))))
        (= 0 (port-column port))))

    (pass-if "x\\n"
      (let ((port (open-input-string "x\n")))
        (while (not (eof-object? (read-char port))))
        (= 0 (port-column port))))

    (pass-if "\\r"
      (let ((port (open-input-string "\r")))
        (while (not (eof-object? (read-char port))))
        (= 0 (port-column port))))

    (pass-if "x\\r"
      (let ((port (open-input-string "x\r")))
        (while (not (eof-object? (read-char port))))
        (= 0 (port-column port))))

    (pass-if "\\t"
      (let ((port (open-input-string "\t")))
        (while (not (eof-object? (read-char port))))
        (= 8 (port-column port))))

    (pass-if "x\\t"
      (let ((port (open-input-string "x\t")))
        (while (not (eof-object? (read-char port))))
        (= 8 (port-column port))))))

(with-test-prefix "port-line"

  ;; in guile 1.8.1 and earlier port-line was truncated to an int, whereas
  ;; scm_t_port actually holds a long; this restricted the range on 64-bit
  ;; systems
  (pass-if "set most-positive-fixnum/2"
    (let ((n    (quotient most-positive-fixnum 2))
          (port (open-output-string)))
      (set-port-line! port n)
      (eqv? n (port-line port)))))

(with-test-prefix "port-encoding"

  (pass-if-exception "set-port-encoding!, wrong encoding"
    exception:miscellaneous-error
    (let ((p (open-input-string "q")))
      (set-port-encoding! p "does-not-exist")
      (read p)))

  (let* ((filename (test-file))
         (port (open-output-file filename)))
    (write 'test port)
    (close-port port)

    (pass-if-exception "%default-port-encoding, wrong encoding"
        exception:miscellaneous-error
      (with-fluids ((%default-port-encoding "does-not-exist"))
                   (set! port (open-input-file filename))
                   (read port)))
    (false-if-exception (close-port port))
    (delete-file filename)))

;;;
;;; port-for-each
;;;

(with-test-prefix "port-for-each"

  ;; In guile 1.8.0 through 1.8.2, port-for-each could pass a freed cell to
  ;; its iterator func if a port was inaccessible in the last gc mark but
  ;; the lazy sweeping has not yet reached it to remove it from the port
  ;; table (scm_i_port_table).  Provoking those gc conditions is a little
  ;; tricky, but the following code made it happen in 1.8.2.
  (pass-if "passing freed cell"
    (let ((lst '()))
      ;; clear out the heap
      (gc) (gc) (gc)
      ;; allocate cells so the opened ports aren't at the start of the heap
      (make-list 1000)
      (open-input-file "/dev/null")
      (make-list 1000)
      (open-input-file "/dev/null")
      ;; this gc leaves the above ports unmarked, ie. inaccessible
      (gc)
      ;; but they're still in the port table, so this sees them
      (port-for-each (lambda (port)
                       (set! lst (cons port lst))))
      ;; this forces completion of the sweeping
      (gc) (gc) (gc)
      ;; and (if the bug is present) the cells accumulated in LST are now
      ;; freed cells, which give #f from `port?'
      (not (memq #f (map port? lst))))))

(with-test-prefix
 "fdes->port"
 (pass-if "fdes->ports finds port"
          (let* ((port (open-file (test-file) "w"))
                 (res (not (not (memq port (fdes->ports (port->fdes port)))))))
            (close-port port)
            res)))

;;;
;;; seek
;;;

(with-test-prefix "seek"

  (with-test-prefix "file port"

    (pass-if "SEEK_CUR"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "abcde" port)))
      (let ((port (open-file (test-file) "r")))
        (read-char port)
        (seek port 2 SEEK_CUR)
        (let ((res (eqv? #\d (read-char port))))
          (close-port port)
          res)))

    (pass-if "SEEK_SET"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "abcde" port)))
      (let ((port (open-file (test-file) "r")))
        (read-char port)
        (seek port 3 SEEK_SET)
        (let ((res (eqv? #\d (read-char port))))
          (close-port port)
          res)))

    (pass-if "SEEK_END"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "abcde" port)))
      (let ((port (open-file (test-file) "r")))
        (read-char port)
        (seek port -2 SEEK_END)
        (let ((res (eqv? #\d (read-char port))))
          (close-port port)
          res)))))

;;;
;;; truncate-file
;;;

(with-test-prefix "truncate-file"

  (pass-if-exception "flonum file" exception:wrong-type-arg
    (truncate-file 1.0 123))

  (pass-if-exception "frac file" exception:wrong-type-arg
    (truncate-file 7/3 123))

  (with-test-prefix "filename"

    (pass-if-exception "flonum length" exception:wrong-type-arg
      (call-with-output-file (test-file)
        (lambda (port)
          (display "hello" port)))
      (truncate-file (test-file) 1.0))

    (pass-if "shorten"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "hello" port)))
      (truncate-file (test-file) 1)
      (eqv? 1 (stat:size (stat (test-file)))))

    (pass-if-exception "shorten to current pos" exception:miscellaneous-error
      (call-with-output-file (test-file)
        (lambda (port)
          (display "hello" port)))
      (truncate-file (test-file))))

  (with-test-prefix "file descriptor"

    (pass-if "shorten"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "hello" port)))
      (let ((fd (open-fdes (test-file) O_RDWR)))
        (truncate-file fd 1)
        (close-fdes fd))
      (eqv? 1 (stat:size (stat (test-file)))))

    (pass-if "shorten to current pos"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "hello" port)))
      (let ((fd (open-fdes (test-file) O_RDWR)))
        (seek fd 1 SEEK_SET)
        (truncate-file fd)
        (close-fdes fd))
      (eqv? 1 (stat:size (stat (test-file))))))

  (with-test-prefix "file port"

    (pass-if "shorten"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "hello" port)))
      (let ((port (open-file (test-file) "r+")))
        (truncate-file port 1)
        (close-port port))
      (eqv? 1 (stat:size (stat (test-file)))))

    (pass-if "shorten to current pos"
      (call-with-output-file (test-file)
        (lambda (port)
          (display "hello" port)))
      (let ((port (open-file (test-file) "r+")))
        (read-char port)
        (truncate-file port)
        (close-port port))
      (eqv? 1 (stat:size (stat (test-file)))))))


;;;; testing read-delimited and friends

(with-test-prefix "read-delimited!"
  (let ((c (make-string 20 #\!)))
    (call-with-input-string
     "defdef\nghighi\n"
     (lambda (port)

       (read-delimited! "\n" c port 'concat)
       (pass-if "read-delimited! reads a first line"
                (string=? c "defdef\n!!!!!!!!!!!!!"))

       (read-delimited! "\n" c port 'concat 3)
       (pass-if "read-delimited! reads a first line"
                (string=? c "defghighi\n!!!!!!!!!!"))))))


;;;; char-ready?

(call-with-input-string
 "howdy"
 (lambda (port)
   (pass-if "char-ready? returns true on string port"
            (char-ready? port))))

;;; This segfaults on some versions of Guile.  We really should run
;;; the tests in a subprocess...

(call-with-input-string
 "howdy"
 (lambda (port)
   (with-input-from-port
       port
     (lambda ()
       (pass-if "char-ready? returns true on string port as default port"
                (char-ready?))))))


;;;; pending-eof behavior

(with-test-prefix "pending EOF behavior"
  ;; Make a test port that will produce the given sequence.  Each
  ;; element of 'lst' may be either a character or #f (which means EOF).
  (define (test-soft-port . lst)
    (make-soft-port
     (vector (lambda (c) #f)            ; write char
             (lambda (s) #f)            ; write string
             (lambda () #f)             ; flush
             (lambda ()                 ; read char
               (let ((c (car lst)))
                 (set! lst (cdr lst))
                 c))
             (lambda () #f))            ; close
     "rw"))

  (define (call-with-port p proc)
    (dynamic-wind
      (lambda () #f)
      (lambda () (proc p))
      (lambda () (close-port p))))

  (define (call-with-test-file str proc)
    (let ((filename (test-file)))
      (dynamic-wind
        (lambda () (call-with-output-file filename
                     (lambda (p) (display str p))))
        (lambda () (call-with-input-file filename proc))
        (lambda () (delete-file (test-file))))))

  (pass-if "peek-char does not swallow EOF (soft port)"
    (call-with-port (test-soft-port #\a #f #\b)
      (lambda (p)
        (and (char=? #\a  (peek-char p))
             (char=? #\a  (read-char p))
             (eof-object? (peek-char p))
             (eof-object? (read-char p))
             (char=? #\b  (peek-char p))
             (char=? #\b  (read-char p))))))

  (pass-if "unread clears pending EOF (soft port)"
    (call-with-port (test-soft-port #\a #f #\b)
      (lambda (p)
        (and (char=? #\a  (read-char p))
             (eof-object? (peek-char p))
             (begin (unread-char #\u p)
                    (char=? #\u  (read-char p)))))))

  (pass-if "unread clears pending EOF (string port)"
    (call-with-input-string "a"
      (lambda (p)
        (and (char=? #\a  (read-char p))
             (eof-object? (peek-char p))
             (begin (unread-char #\u p)
                    (char=? #\u  (read-char p)))))))

  (pass-if "unread clears pending EOF (file port)"
    (call-with-test-file
     "a"
     (lambda (p)
       (and (char=? #\a  (read-char p))
            (eof-object? (peek-char p))
            (begin (unread-char #\u p)
                   (char=? #\u  (read-char p)))))))

  (pass-if "seek clears pending EOF (string port)"
    (call-with-input-string "a"
      (lambda (p)
        (and (char=? #\a  (read-char p))
             (eof-object? (peek-char p))
             (begin (seek p 0 SEEK_SET)
                    (char=? #\a (read-char p)))))))

  (pass-if "seek clears pending EOF (file port)"
    (call-with-test-file
     "a"
     (lambda (p)
       (and (char=? #\a  (read-char p))
            (eof-object? (peek-char p))
            (begin (seek p 0 SEEK_SET)
                   (char=? #\a (read-char p))))))))


;;;; Close current-input-port, and make sure everyone can handle it.

(with-test-prefix "closing current-input-port"
  (for-each (lambda (procedure name)
              (with-input-from-port
                  (call-with-input-string "foo" (lambda (p) p))
                (lambda ()
                  (close-port (current-input-port))
                  (pass-if-exception name
                    exception:wrong-type-arg
                    (procedure)))))
            (list read read-char read-line)
            '("read" "read-char" "read-line")))



(with-test-prefix "setvbuf"

  (pass-if-exception "closed port"
      exception:wrong-type-arg
    (let ((port (open-input-file "/dev/null")))
      (close-port port)
      (setvbuf port 'block)))

  (pass-if-exception "string port"
      exception:wrong-type-arg
    (let ((port (open-input-string "Hey!")))
      (close-port port)
      (setvbuf port 'block)))

  (pass-if "line/column number preserved"
    ;; In Guile 2.0.5, `setvbuf' would erroneously decrease the port's
    ;; line and/or column number.
    (call-with-output-file (test-file)
      (lambda (p)
        (display "This is GNU Guile.\nWelcome." p)))
    (call-with-input-file (test-file)
      (lambda (p)
        (and (eqv? #\T (read-char p))
             (let ((line (port-line p))
                   (col  (port-column p)))
               (and (= line 0) (= col 1)
                    (begin
                      (setvbuf p 'block 777)
                      (let ((line* (port-line p))
                            (col*  (port-column p)))
                        (and (= line line*)
                             (= col col*)))))))))))



(pass-if-equal "unget-bytevector"
    #vu8(10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 200 201 202 203
            1 2 3 4 251 253 254 255)
  (let ((port (open-bytevector-input-port #vu8(1 2 3 4 251 253 254 255))))
    (unget-bytevector port #vu8(200 201 202 203))
    (unget-bytevector port #vu8(20 21 22 23 24))
    (unget-bytevector port #vu8(10 11 12 13 14 15 16 17 18 19) 4)
    (unget-bytevector port #vu8(10 11 12 13 14 15 16 17 18 19) 2 2)
    (unget-bytevector port #vu8(10 11))
    (get-bytevector-all port)))



(with-test-prefix "unicode byte-order marks (BOMs)"

  (define (bv-read-test* encoding bv proc)
    (let ((port (open-bytevector-input-port bv)))
      (set-port-encoding! port encoding)
      (proc port)))

  (define (bv-read-test encoding bv)
    (bv-read-test* encoding bv read-string))

  (define (bv-write-test* encoding proc)
    (call-with-values
        (lambda () (open-bytevector-output-port))
      (lambda (port get-bytevector)
        (set-port-encoding! port encoding)
        (proc port)
        (get-bytevector))))

  (define (bv-write-test encoding str)
    (bv-write-test* encoding
                    (lambda (p)
                      (display str p))))

  (pass-if-equal "BOM not discarded from Latin-1 stream"
      "\xEF\xBB\xBF\x61"
    (bv-read-test "ISO-8859-1" #vu8(#xEF #xBB #xBF #x61)))

  (pass-if-equal "BOM not discarded from Latin-2 stream"
      "\u010F\u0165\u017C\x61"
    (bv-read-test "ISO-8859-2" #vu8(#xEF #xBB #xBF #x61)))

  (pass-if-equal "BOM not discarded from UTF-16BE stream"
      "\uFEFF\x61"
    (bv-read-test "UTF-16BE" #vu8(#xFE #xFF #x00 #x61)))

  (pass-if-equal "BOM not discarded from UTF-16LE stream"
      "\uFEFF\x61"
    (bv-read-test "UTF-16LE" #vu8(#xFF #xFE #x61 #x00)))

  (pass-if-equal "BOM not discarded from UTF-32BE stream"
      "\uFEFF\x61"
    (bv-read-test "UTF-32BE" #vu8(#x00 #x00 #xFE #xFF
                                       #x00 #x00 #x00 #x61)))

  (pass-if-equal "BOM not discarded from UTF-32LE stream"
      "\uFEFF\x61"
    (bv-read-test "UTF-32LE" #vu8(#xFF #xFE #x00 #x00
                                       #x61 #x00 #x00 #x00)))

  (pass-if-equal "BOM not written to UTF-8 stream"
      #vu8(#x61)
    (bv-write-test "UTF-8" "a"))

  (pass-if-equal "BOM not written to UTF-16BE stream"
      #vu8(#x00 #x61)
    (bv-write-test "UTF-16BE" "a"))

  (pass-if-equal "BOM not written to UTF-16LE stream"
      #vu8(#x61 #x00)
    (bv-write-test "UTF-16LE" "a"))

  (pass-if-equal "BOM not written to UTF-32BE stream"
      #vu8(#x00 #x00 #x00 #x61)
    (bv-write-test "UTF-32BE" "a"))

  (pass-if-equal "BOM not written to UTF-32LE stream"
      #vu8(#x61 #x00 #x00 #x00)
    (bv-write-test "UTF-32LE" "a"))

  (pass-if "Don't read from the port unless user asks to"
    (let* ((p (make-soft-port
               (vector
                (lambda (c) #f)           ; write char
                (lambda (s) #f)           ; write string
                (lambda () #f)            ; flush
                (lambda () (throw 'fail)) ; read char
                (lambda () #f))
               "rw")))
      (set-port-encoding! p "UTF-16")
      (display "abc" p)
      (set-port-encoding! p "UTF-32")
      (display "def" p)
      #t))

  ;; TODO: test that input and output streams are independent when
  ;; appropriate, and linked when appropriate.

  (pass-if-equal "BOM discarded from start of UTF-8 stream"
      "a"
    (bv-read-test "Utf-8" #vu8(#xEF #xBB #xBF #x61)))

  (pass-if-equal "BOM discarded from start of UTF-8 stream after seek to 0"
      '(#\a "a")
    (bv-read-test* "uTf-8" #vu8(#xEF #xBB #xBF #x61)
                   (lambda (p)
                     (let ((c (read-char p)))
                       (seek p 0 SEEK_SET)
                       (let ((s (read-string p)))
                         (list c s))))))

  (pass-if-equal "Only one BOM discarded from start of UTF-8 stream"
      "\uFEFFa"
    (bv-read-test "UTF-8" #vu8(#xEF #xBB #xBF #xEF #xBB #xBF #x61)))

  (pass-if-equal "BOM not discarded from UTF-8 stream after seek to > 0"
      "\uFEFFb"
    (bv-read-test* "UTF-8" #vu8(#x61 #xEF #xBB #xBF #x62)
                   (lambda (p)
                     (seek p 1 SEEK_SET)
                     (read-string p))))

  (pass-if-equal "BOM not discarded unless at start of UTF-8 stream"
      "a\uFEFFb"
    (bv-read-test "UTF-8" #vu8(#x61 #xEF #xBB #xBF #x62)))

  (pass-if-equal "BOM (BE) written to start of UTF-16 stream"
      #vu8(#xFE #xFF #x00 #x61 #x00 #x62)
    (bv-write-test "UTF-16" "ab"))

  (pass-if-equal "BOM (BE) written to UTF-16 stream after set-port-encoding!"
      #vu8(#xFE #xFF #x00 #x61 #x00 #x62 #xFE #xFF #x00 #x63 #x00 #x64)
    (bv-write-test* "UTF-16"
                    (lambda (p)
                      (display "ab" p)
                      (set-port-encoding! p "UTF-16")
                      (display "cd" p))))

  (pass-if-equal "BOM discarded from start of UTF-16 stream (BE)"
      "a"
    (bv-read-test "UTF-16" #vu8(#xFE #xFF #x00 #x61)))

  (pass-if-equal "BOM discarded from start of UTF-16 stream (BE) after seek to 0"
      '(#\a "a")
    (bv-read-test* "utf-16" #vu8(#xFE #xFF #x00 #x61)
                   (lambda (p)
                     (let ((c (read-char p)))
                       (seek p 0 SEEK_SET)
                       (let ((s (read-string p)))
                         (list c s))))))

  (pass-if-equal "Only one BOM discarded from start of UTF-16 stream (BE)"
      "\uFEFFa"
    (bv-read-test "Utf-16" #vu8(#xFE #xFF #xFE #xFF #x00 #x61)))

  (pass-if-equal "BOM not discarded from UTF-16 stream (BE) after seek to > 0"
      "\uFEFFa"
    (bv-read-test* "uTf-16" #vu8(#xFE #xFF #xFE #xFF #x00 #x61)
                   (lambda (p)
                     (seek p 2 SEEK_SET)
                     (read-string p))))

  (pass-if-equal "BOM not discarded unless at start of UTF-16 stream"
      "a\uFEFFb"
    (bv-read-test "utf-16" #vu8(#x00 #x61 #xFE #xFF #x00 #x62)))

  (pass-if-equal "BOM discarded from start of UTF-16 stream (LE)"
      "a"
    (bv-read-test "UTF-16" #vu8(#xFF #xFE #x61 #x00)))

  (pass-if-equal "BOM discarded from start of UTF-16 stream (LE) after seek to 0"
      '(#\a "a")
    (bv-read-test* "Utf-16" #vu8(#xFF #xFE #x61 #x00)
                   (lambda (p)
                     (let ((c (read-char p)))
                       (seek p 0 SEEK_SET)
                       (let ((s (read-string p)))
                         (list c s))))))

  (pass-if-equal "Only one BOM discarded from start of UTF-16 stream (LE)"
      "\uFEFFa"
    (bv-read-test "UTf-16" #vu8(#xFF #xFE #xFF #xFE #x61 #x00)))

  (pass-if-equal "BOM discarded from start of UTF-32 stream (BE)"
      "a"
    (bv-read-test "UTF-32" #vu8(#x00 #x00 #xFE #xFF
                                     #x00 #x00 #x00 #x61)))

  (pass-if-equal "BOM discarded from start of UTF-32 stream (BE) after seek to 0"
      '(#\a "a")
    (bv-read-test* "utF-32" #vu8(#x00 #x00 #xFE #xFF
                                      #x00 #x00 #x00 #x61)
                   (lambda (p)
                     (let ((c (read-char p)))
                       (seek p 0 SEEK_SET)
                       (let ((s (read-string p)))
                         (list c s))))))

  (pass-if-equal "Only one BOM discarded from start of UTF-32 stream (BE)"
      "\uFEFFa"
    (bv-read-test "UTF-32" #vu8(#x00 #x00 #xFE #xFF
                                     #x00 #x00 #xFE #xFF
                                     #x00 #x00 #x00 #x61)))

  (pass-if-equal "BOM not discarded from UTF-32 stream (BE) after seek to > 0"
      "\uFEFFa"
    (bv-read-test* "UtF-32" #vu8(#x00 #x00 #xFE #xFF
                                      #x00 #x00 #xFE #xFF
                                      #x00 #x00 #x00 #x61)
                   (lambda (p)
                     (seek p 4 SEEK_SET)
                     (read-string p))))

  (pass-if-equal "BOM discarded within UTF-16 stream (BE) after set-port-encoding!"
      "ab"
    (bv-read-test* "UTF-16" #vu8(#x00 #x61 #xFE #xFF #x00 #x62)
                   (lambda (p)
                     (let ((a (read-char p)))
                       (set-port-encoding! p "UTF-16")
                       (string a (read-char p))))))

  (pass-if-equal "BOM discarded within UTF-16 stream (LE,BE) after set-port-encoding!"
      "ab"
    (bv-read-test* "utf-16" #vu8(#x00 #x61 #xFF #xFE #x62 #x00)
                   (lambda (p)
                     (let ((a (read-char p)))
                       (set-port-encoding! p "UTF-16")
                       (string a (read-char p))))))

  (pass-if-equal "BOM discarded within UTF-32 stream (BE) after set-port-encoding!"
      "ab"
    (bv-read-test* "UTF-32" #vu8(#x00 #x00 #x00 #x61
                                      #x00 #x00 #xFE #xFF
                                      #x00 #x00 #x00 #x62)
                   (lambda (p)
                     (let ((a (read-char p)))
                       (set-port-encoding! p "UTF-32")
                       (string a (read-char p))))))

  (pass-if-equal "BOM discarded within UTF-32 stream (LE,BE) after set-port-encoding!"
      "ab"
    (bv-read-test* "UTF-32" #vu8(#x00 #x00 #x00 #x61
                                      #xFF #xFE #x00 #x00
                                      #x62 #x00 #x00 #x00)
                   (lambda (p)
                     (let ((a (read-char p)))
                       (set-port-encoding! p "UTF-32")
                       (string a (read-char p))))))

  (pass-if-equal "BOM not discarded unless at start of UTF-32 stream"
      "a\uFEFFb"
    (bv-read-test "UTF-32" #vu8(#x00 #x00 #x00 #x61
                                     #x00 #x00 #xFE #xFF
                                     #x00 #x00 #x00 #x62)))

  (pass-if-equal "BOM discarded from start of UTF-32 stream (LE)"
      "a"
    (bv-read-test "UTF-32" #vu8(#xFF #xFE #x00 #x00
                                     #x61 #x00 #x00 #x00)))

  (pass-if-equal "BOM discarded from start of UTF-32 stream (LE) after seek to 0"
      '(#\a "a")
    (bv-read-test* "UTf-32" #vu8(#xFF #xFE #x00 #x00
                                      #x61 #x00 #x00 #x00)
                   (lambda (p)
                     (let ((c (read-char p)))
                       (seek p 0 SEEK_SET)
                       (let ((s (read-string p)))
                         (list c s))))))

  (pass-if-equal "Only one BOM discarded from start of UTF-32 stream (LE)"
      "\uFEFFa"
    (bv-read-test "UTF-32" #vu8(#xFF #xFE #x00 #x00
                                     #xFF #xFE #x00 #x00
                                     #x61 #x00 #x00 #x00))))



(define-syntax-rule (with-load-path path body ...)
  (let ((new path)
        (old %load-path))
    (dynamic-wind
      (lambda ()
        (set! %load-path new))
      (lambda ()
        body ...)
      (lambda ()
        (set! %load-path old)))))

(define %temporary-directory
  (string-append (or (getenv "TMPDIR") "/tmp") "/guile-ports-test."
                 (number->string (getpid))))

(with-test-prefix "%file-port-name-canonicalization"

  (pass-if-equal "absolute file name & empty %load-path entry" "/dev/null"
    ;; In Guile 2.0.5 and earlier, this would return "dev/null" instead
    ;; of "/dev/null".  See
    ;; <http://lists.gnu.org/archive/html/guile-devel/2012-05/msg00059.html>
    ;; for a discussion.
    (with-load-path (cons "" (delete "/" %load-path))
      (with-fluids ((%file-port-name-canonicalization 'relative))
        (port-filename (open-input-file "/dev/null")))))

  (pass-if-equal "relative canonicalization with /" "dev/null"
    (with-load-path (cons "/" %load-path)
      (with-fluids ((%file-port-name-canonicalization 'relative))
        (port-filename (open-input-file "/dev/null")))))

  (pass-if-equal "relative canonicalization with /dev/.." "dev/null"
    (with-load-path (cons "/dev/.." %load-path)
      (with-fluids ((%file-port-name-canonicalization 'relative))
        (port-filename (open-input-file "/dev/null")))))

  (pass-if-equal "relative canonicalization from ice-9" "ice-9/q.scm"
    (with-fluids ((%file-port-name-canonicalization 'relative))
      (port-filename
       (open-input-file (%search-load-path "ice-9/q.scm")))))

  (pass-if-equal "relative canonicalization with common prefixes"
      "x.scm"

    ;; In Guile up to 2.2.2, this would return "wrong/x.scm'.
    (let* ((dir1 (string-append %temporary-directory "/something"))
           (dir2 (string-append dir1 "-wrong")))
      (with-load-path (append (list dir1 dir2) %load-path)
        (dynamic-wind
          (lambda ()
            (mkdir %temporary-directory)
            (mkdir dir1)
            (mkdir dir2)
            (call-with-output-file (string-append dir2 "/x.scm")
              (const #t)))
          (lambda ()
            (with-fluids ((%file-port-name-canonicalization 'relative))
              (port-filename
               (open-input-file (string-append dir2 "/x.scm")))))
          (lambda ()
            (delete-file (string-append dir2 "/x.scm"))
            (rmdir dir2)
            (rmdir dir1)
            (rmdir %temporary-directory))))))

  (pass-if-equal "absolute canonicalization from ice-9"
      (canonicalize-path
       (string-append (assoc-ref %guile-build-info 'top_srcdir)
                      "/module/ice-9/q.scm"))
    (with-fluids ((%file-port-name-canonicalization 'absolute))
      (port-filename (open-input-file (%search-load-path "ice-9/q.scm"))))))

(with-test-prefix "file name separators"

  (pass-if "no backslash separators in Windows file names"
    ;; In Guile 2.0.11 and earlier, %load-path on Windows could
    ;; include file names with backslashes, and `getcwd' on Windows
    ;; would always return a directory name with backslashes.
    (or (not (file-name-separator? #\\))
        (with-load-path (cons (getcwd) %load-path)
          (not (string-index (%search-load-path (basename (test-file)))
                             #\\))))))

(delete-file (test-file))

;;; Local Variables:
;;; eval: (put 'test-decoding-error 'scheme-indent-function 3)
;;; eval: (put 'with-load-path 'scheme-indent-function 1)
;;; End: