;;;; r6rs-ports.test --- R6RS I/O port tests.   -*- coding: utf-8; -*-
;;;;
;;;; Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
;;;; Ludovic Courtès
;;;;
;;;; 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-io-ports)
  #:use-module (test-suite lib)
  #:use-module (test-suite guile-test)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (rnrs io ports)
  #:use-module (rnrs io simple)
  #:use-module (rnrs exceptions)
  #:use-module (rnrs bytevectors))

;;; All these tests assume Guile 1.8's port system, where characters are
;;; treated as octets.

;; Set the default encoding of future ports to be Latin-1.
(fluid-set! %default-port-encoding #f)

(define-syntax pass-if-condition
  (syntax-rules ()
    ((_ name predicate body0 body ...)
     (let ((cookie (list 'cookie)))
       (pass-if name
         (eq? cookie (guard (c ((predicate c) cookie))
                       body0 body ...)))))))

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

;; A input/output port that swallows all output, and produces just
;; spaces on input.  Reading and writing beyond `failure-position'
;; produces `system-error' exceptions.  Used for testing exception
;; behavior.
(define* (make-failing-port #:optional (failure-position 0))
  (define (maybe-fail index errno)
    (if (> index failure-position)
        (scm-error 'system-error
                   'failing-port
                   "I/O beyond failure position" '()
                   (list errno))))
  (let ((read-index  0)
        (write-index 0))
    (define (write-char chr)
      (set! write-index (+ 1 write-index))
      (maybe-fail write-index ENOSPC))
    (make-soft-port
     (vector write-char
             (lambda (str)   ;; write-string
               (for-each write-char (string->list str)))
             (lambda () #t)  ;; flush-output
             (lambda ()      ;; read-char
               (set! read-index (+ read-index 1))
               (maybe-fail read-index EIO)
               #\space)
             (lambda () #t)) ;; close-port
     "rw")))


(with-test-prefix "7.2.5 End-of-File Object"

  (pass-if "eof-object"
    (and (eqv? (eof-object) (eof-object))
         (eq?  (eof-object) (eof-object))))

  (pass-if "port-eof?"
    (port-eof? (open-input-string ""))))


(with-test-prefix "7.2.8 Binary Input"

  (pass-if "get-u8"
    (let ((port (open-input-string "A")))
      (and (= (char->integer #\A) (get-u8 port))
           (eof-object? (get-u8 port)))))

  (pass-if "lookahead-u8"
    (let ((port (open-input-string "A")))
      (and (= (char->integer #\A) (lookahead-u8 port))
           (= (char->integer #\A) (lookahead-u8 port))
           (= (char->integer #\A) (get-u8 port))
           (eof-object? (get-u8 port)))))

  (pass-if "lookahead-u8 non-ASCII"
    (let ((port (with-fluids ((%default-port-encoding "UTF-8"))
                  (open-input-string "λ"))))
      (and (= 206 (lookahead-u8 port))
           (= 206 (lookahead-u8 port))
           (= 206 (get-u8 port))
           (= 187 (lookahead-u8 port))
           (= 187 (lookahead-u8 port))
           (= 187 (get-u8 port))
           (eof-object? (lookahead-u8 port))
           (eof-object? (get-u8 port)))))

  (pass-if "lookahead-u8: result is unsigned"
    ;; Bug #31081.
    (let ((port (open-bytevector-input-port #vu8(255))))
      (= (lookahead-u8 port) 255)))

  (pass-if "get-bytevector-n [short]"
    (let* ((port (open-input-string "GNU Guile"))
           (bv (get-bytevector-n port 4)))
      (and (bytevector? bv)
           (equal? (bytevector->u8-list bv)
                   (map char->integer (string->list "GNU "))))))

  (pass-if "get-bytevector-n [long]"
    (let* ((port (open-input-string "GNU Guile"))
           (bv (get-bytevector-n port 256)))
      (and (bytevector? bv)
           (equal? (bytevector->u8-list bv)
                   (map char->integer (string->list "GNU Guile"))))))

  (pass-if-exception "get-bytevector-n with closed port"
    exception:wrong-type-arg

    (let ((port (%make-void-port "r")))

      (close-port port)
      (get-bytevector-n port 3)))

  (pass-if "get-bytevector-n! [short]"
    (let* ((port (open-input-string "GNU Guile"))
           (bv   (make-bytevector 4))
           (read (get-bytevector-n! port bv 0 4)))
      (and (equal? read 4)
           (equal? (bytevector->u8-list bv)
                   (map char->integer (string->list "GNU "))))))

  (pass-if "get-bytevector-n! [long]"
    (let* ((str  "GNU Guile")
           (port (open-input-string str))
           (bv   (make-bytevector 256))
           (read (get-bytevector-n! port bv 0 256)))
      (and (equal? read (string-length str))
           (equal? (map (lambda (i)
                          (bytevector-u8-ref bv i))
                        (iota read))
                   (map char->integer (string->list str))))))

  (pass-if "get-bytevector-some [simple]"
    (let* ((str  "GNU Guile")
           (port (open-input-string str))
           (bv   (get-bytevector-some port)))
      (and (bytevector? bv)
           (equal? (bytevector->u8-list bv)
                   (map char->integer (string->list str))))))

  (pass-if "get-bytevector-some [only-some]"
    (let* ((str   "GNU Guile")
           (index 0)
           (port  (make-soft-port
                   (vector #f #f #f
                           (lambda ()
                             (if (>= index (string-length str))
                                 (eof-object)
                                 (let ((c (string-ref str index)))
                                   (set! index (+ index 1))
                                   c)))
                           (lambda () #t)
                           (lambda ()
                             ;; Number of readily available octets: falls to
                             ;; zero after 4 octets have been read.
                             (- 4 (modulo index 5))))
                   "r"))
           (bv    (get-bytevector-some port)))
      (and (bytevector? bv)
           (= index 4)
           (= (bytevector-length bv) index)
           (equal? (bytevector->u8-list bv)
                   (map char->integer (string->list "GNU "))))))

  (pass-if "get-bytevector-all"
    (let* ((str   "GNU Guile")
           (index 0)
           (port  (make-soft-port
                   (vector #f #f #f
                           (lambda ()
                             (if (>= index (string-length str))
                                 (eof-object)
                                 (let ((c (string-ref str index)))
                                   (set! index (+ index 1))
                                   c)))
                           (lambda () #t)
                           (let ((cont? #f))
                             (lambda ()
                               ;; Number of readily available octets: falls to
                               ;; zero after 4 octets have been read and then
                               ;; starts again.
                               (let ((a (if cont?
                                            (- (string-length str) index)
                                            (- 4 (modulo index 5)))))
                                 (if (= 0 a) (set! cont? #t))
                                 a))))
                   "r"))
           (bv    (get-bytevector-all port)))
      (and (bytevector? bv)
           (= index (string-length str))
           (= (bytevector-length bv) (string-length str))
           (equal? (bytevector->u8-list bv)
                   (map char->integer (string->list str)))))))


(define (make-soft-output-port)
  (let* ((bv (make-bytevector 1024))
         (read-index  0)
         (write-index 0)
         (write-char (lambda (chr)
                       (bytevector-u8-set! bv write-index
                                           (char->integer chr))
                       (set! write-index (+ 1 write-index)))))
    (make-soft-port
     (vector write-char
             (lambda (str)   ;; write-string
               (for-each write-char (string->list str)))
             (lambda () #t)  ;; flush-output
             (lambda ()      ;; read-char
               (if (>= read-index (bytevector-length bv))
                   (eof-object)
                   (let ((c (bytevector-u8-ref bv read-index)))
                     (set! read-index (+ read-index 1))
                     (integer->char c))))
             (lambda () #t)) ;; close-port
     "rw")))

(with-test-prefix "7.2.11 Binary Output"

  (pass-if "put-u8"
    (let ((port (make-soft-output-port)))
      (put-u8 port 77)
      (equal? (get-u8 port) 77)))

  ;; Note: The `put-bytevector' tests below require a Latin-1 locale so
  ;; that the `scm_from_locale_stringn' call in `sf_write' will let all
  ;; the bytes through, unmodified.  This is hacky, but we can't use
  ;; "custom binary output ports" here because they're only tested
  ;; later.

  (pass-if "put-bytevector [2 args]"
    (with-latin1-locale
     (let ((port (make-soft-output-port))
           (bv   (make-bytevector 256)))
       (put-bytevector port bv)
       (equal? (bytevector->u8-list bv)
               (bytevector->u8-list
                (get-bytevector-n port (bytevector-length bv)))))))

  (pass-if "put-bytevector [3 args]"
    (with-latin1-locale
     (let ((port  (make-soft-output-port))
           (bv    (make-bytevector 256))
           (start 10))
       (put-bytevector port bv start)
       (equal? (drop (bytevector->u8-list bv) start)
               (bytevector->u8-list
                (get-bytevector-n port (- (bytevector-length bv) start)))))))

  (pass-if "put-bytevector [4 args]"
    (with-latin1-locale
     (let ((port  (make-soft-output-port))
           (bv    (make-bytevector 256))
           (start 10)
           (count 77))
       (put-bytevector port bv start count)
       (equal? (take (drop (bytevector->u8-list bv) start) count)
               (bytevector->u8-list
                (get-bytevector-n port count))))))

  (pass-if-exception "put-bytevector with closed port"
    exception:wrong-type-arg

    (let* ((bv   (make-bytevector 4))
           (port (%make-void-port "w")))

      (close-port port)
      (put-bytevector port bv)))

  (pass-if "put-bytevector with UTF-16 string port"
    (let* ((str "hello, world")
           (bv  (string->utf16 str)))
      (equal? str
              (with-fluids ((%default-port-encoding "UTF-16BE"))
                (call-with-output-string
                  (lambda (port)
                    (put-bytevector port bv)))))))

  (pass-if "put-bytevector with wrong-encoding string port"
    (let* ((str "hello, world")
           (bv  (string->utf16 str)))
      (catch 'decoding-error
        (lambda ()
          (with-fluids ((%default-port-encoding "UTF-32"))
            (call-with-output-string
              (lambda (port)
                (put-bytevector port bv)))))
        (lambda (key subr message errno port)
          (string? (strerror errno)))))))


(with-test-prefix "7.2.7 Input Ports"

  ;; This section appears here so that it can use the binary input
  ;; primitives.

  (pass-if "open-bytevector-input-port [1 arg]"
    (let* ((str "Hello Port!")
           (bv (u8-list->bytevector (map char->integer
                                         (string->list str))))
           (port (open-bytevector-input-port bv))
           (read-to-string
            (lambda (port)
              (let loop ((chr (read-char port))
                         (result '()))
                (if (eof-object? chr)
                    (apply string (reverse! result))
                    (loop (read-char port)
                          (cons chr result)))))))

      (equal? (read-to-string port) str)))

  (pass-if "bytevector-input-port is binary"
    (with-fluids ((%default-port-encoding "UTF-8"))
      (binary-port? (open-bytevector-input-port #vu8(1 2 3)))))

  (pass-if-exception "bytevector-input-port is read-only"
    exception:wrong-type-arg

    (let* ((str "Hello Port!")
           (bv (u8-list->bytevector (map char->integer
                                         (string->list str))))
           (port (open-bytevector-input-port bv #f)))

      (write "hello" port)))

  (pass-if "bytevector input port supports seeking"
    (let* ((str "Hello Port!")
           (bv (u8-list->bytevector (map char->integer
                                         (string->list str))))
           (port (open-bytevector-input-port bv #f)))

      (and (port-has-port-position? port)
           (= 0 (port-position port))
           (port-has-set-port-position!? port)
           (begin
             (set-port-position! port 6)
             (= 6 (port-position port)))
           (bytevector=? (get-bytevector-all port)
                         (u8-list->bytevector
                          (map char->integer (string->list "Port!")))))))

  (pass-if "bytevector input port can seek to very end"
    (let ((empty (open-bytevector-input-port '#vu8()))
          (not-empty (open-bytevector-input-port '#vu8(1 2 3))))
      (and (begin (set-port-position! empty (port-position empty))
                  (= 0 (port-position empty)))
           (begin (get-bytevector-n not-empty 3)
                  (set-port-position! not-empty (port-position not-empty))
                  (= 3 (port-position not-empty))))))

  (pass-if-exception "make-custom-binary-input-port [wrong-num-args]"
    exception:wrong-num-args

    ;; Prior to Guile-R6RS-Libs 0.2, the last 3 arguments were wrongfully
    ;; optional.
    (make-custom-binary-input-port "port" (lambda args #t)))

  (pass-if "make-custom-binary-input-port"
    (let* ((source (make-bytevector 7777))
           (read! (let ((pos 0)
                        (len (bytevector-length source)))
                    (lambda (bv start count)
                      (let ((amount (min count (- len pos))))
                        (if (> amount 0)
                            (bytevector-copy! source pos
                                              bv start amount))
                        (set! pos (+ pos amount))
                        amount))))
           (port (make-custom-binary-input-port "the port" read!
                                                #f #f #f)))

      (and (binary-port? port)
           (input-port? port)
           (bytevector=? (get-bytevector-all port) source))))

  (pass-if "custom binary input port does not support `port-position'"
    (let* ((str "Hello Port!")
           (source (open-bytevector-input-port
                    (u8-list->bytevector
                     (map char->integer (string->list str)))))
           (read! (lambda (bv start count)
                    (let ((r (get-bytevector-n! source bv start count)))
                      (if (eof-object? r)
                          0
                          r))))
           (port (make-custom-binary-input-port "the port" read!
                                                #f #f #f)))
      (not (or (port-has-port-position? port)
               (port-has-set-port-position!? port)))))

  (pass-if "custom binary input port supports `port-position'"
    (let* ((str "Hello Port!")
           (source (open-bytevector-input-port
                    (u8-list->bytevector
                     (map char->integer (string->list str)))))
           (read! (lambda (bv start count)
                    (let ((r (get-bytevector-n! source bv start count)))
                      (if (eof-object? r)
                          0
                          r))))
           (get-pos (lambda ()
                      (port-position source)))
           (set-pos! (lambda (pos)
                       (set-port-position! source pos)))
           (port (make-custom-binary-input-port "the port" read!
                                                get-pos set-pos! #f)))

      (and (port-has-port-position? port)
           (= 0 (port-position port))
           (port-has-set-port-position!? port)
           (begin
             (set-port-position! port 6)
             (= 6 (port-position port)))
           (bytevector=? (get-bytevector-all port)
                         (u8-list->bytevector
                          (map char->integer (string->list "Port!")))))))

  (pass-if "custom binary input port `close-proc' is called"
    (let* ((closed?  #f)
           (read!    (lambda (bv start count) 0))
           (get-pos  (lambda () 0))
           (set-pos! (lambda (pos) #f))
           (close!   (lambda () (set! closed? #t)))
           (port     (make-custom-binary-input-port "the port" read!
                                                    get-pos set-pos!
                                                    close!)))

      (close-port port)
      (gc) ; Test for marking a closed port.
      closed?))

  (pass-if "standard-input-port is binary"
    (with-fluids ((%default-port-encoding "UTF-8"))
      (binary-port? (standard-input-port)))))


(with-test-prefix "8.2.10 Output ports"

  (let ((filename (test-file)))
    (pass-if "open-file-output-port [opens binary port]"
      (call-with-port (open-file-output-port filename)
        (lambda (port)
          (put-bytevector port '#vu8(1 2 3))
          (binary-port? port))))
    
    (pass-if-condition "open-file-output-port [exception: already-exists]"
        i/o-file-already-exists-error?
      (open-file-output-port filename))
    
    (pass-if "open-file-output-port [no-fail no-truncate]"
      (and
        (call-with-port (open-file-output-port filename
                                               (file-options no-fail no-truncate))
          (lambda (port)
            (= 0 (port-position port))))
        (= 3 (stat:size (stat filename)))))

    (pass-if "open-file-output-port [no-fail]"
      (and
        (call-with-port (open-file-output-port filename (file-options no-fail))
          binary-port?)
        (= 0 (stat:size (stat filename)))))
    
    (delete-file filename)
    
    (pass-if-condition "open-file-output-port [exception: does-not-exist]"
        i/o-file-does-not-exist-error?
      (open-file-output-port filename (file-options no-create))))
  
  (pass-if "open-bytevector-output-port"
    (let-values (((port get-content)
                  (open-bytevector-output-port #f)))
      (let ((source (make-bytevector 7777)))
        (put-bytevector port source)
        (and (bytevector=? (get-content) source)
             (bytevector=? (get-content) (make-bytevector 0))))))

  (pass-if "bytevector-output-port is binary"
    (binary-port? (open-bytevector-output-port)))

  (pass-if "open-bytevector-output-port [extract after close]"
    (let-values (((port get-content)
                  (open-bytevector-output-port)))
      (let ((source (make-bytevector 12345 #xFE)))
        (put-bytevector port source)
        (close-port port)
        (bytevector=? (get-content) source))))

  (pass-if "open-bytevector-output-port [put-u8]"
    (let-values (((port get-content)
                  (open-bytevector-output-port)))
      (put-u8 port 77)
      (and (bytevector=? (get-content) (make-bytevector 1 77))
           (bytevector=? (get-content) (make-bytevector 0)))))

  (pass-if "open-bytevector-output-port [display]"
    (let-values (((port get-content)
                  (open-bytevector-output-port)))
      (display "hello" port)
      (and (bytevector=? (get-content) (string->utf8 "hello"))
           (bytevector=? (get-content) (make-bytevector 0)))))

  (pass-if "bytevector output port supports `port-position'"
    (let-values (((port get-content)
                  (open-bytevector-output-port)))
      (let ((source (make-bytevector 7777))
            (overwrite (make-bytevector 33)))
        (and (port-has-port-position? port)
             (port-has-set-port-position!? port)
             (begin
               (put-bytevector port source)
               (= (bytevector-length source)
                  (port-position port)))
             (begin
               (set-port-position! port 10)
               (= 10 (port-position port)))
             (begin
               (put-bytevector port overwrite)
               (bytevector-copy! overwrite 0 source 10
                                 (bytevector-length overwrite))
               (= (port-position port)
                  (+ 10 (bytevector-length overwrite))))
             (bytevector=? (get-content) source)
             (bytevector=? (get-content) (make-bytevector 0))))))

  (pass-if "make-custom-binary-output-port"
    (let ((port (make-custom-binary-output-port "cbop"
                                                (lambda (x y z) 0)
                                                #f #f #f)))
      (and (output-port? port)
           (binary-port? port)
           (not (port-has-port-position? port))
           (not (port-has-set-port-position!? port)))))

  (pass-if "make-custom-binary-output-port [partial writes]"
    (let* ((source   (uint-list->bytevector (iota 333)
                                            (native-endianness) 2))
           (sink     (make-bytevector (bytevector-length source)))
           (sink-pos 0)
           (eof?     #f)
           (write!   (lambda (bv start count)
                       (if (= 0 count)
                           (begin
                             (set! eof? #t)
                             0)
                           (let ((u8 (bytevector-u8-ref bv start)))
                             ;; Get one byte at a time.
                             (bytevector-u8-set! sink sink-pos u8)
                             (set! sink-pos (+ 1 sink-pos))
                             1))))
           (port     (make-custom-binary-output-port "cbop" write!
                                                     #f #f #f)))
      (put-bytevector port source)
      (and (= sink-pos (bytevector-length source))
           (not eof?)
           (bytevector=? sink source))))

  (pass-if "make-custom-binary-output-port [full writes]"
    (let* ((source   (uint-list->bytevector (iota 333)
                                            (native-endianness) 2))
           (sink     (make-bytevector (bytevector-length source)))
           (sink-pos 0)
           (eof?     #f)
           (write!   (lambda (bv start count)
                       (if (= 0 count)
                           (begin
                             (set! eof? #t)
                             0)
                           (begin
                             (bytevector-copy! bv start
                                               sink sink-pos
                                               count)
                             (set! sink-pos (+ sink-pos count))
                             count))))
           (port     (make-custom-binary-output-port "cbop" write!
                                                     #f #f #f)))
      (put-bytevector port source)
      (and (= sink-pos (bytevector-length source))
           (not eof?)
           (bytevector=? sink source))))

  (pass-if "standard-output-port is binary"
    (with-fluids ((%default-port-encoding "UTF-8"))
      (binary-port? (standard-output-port))))

  (pass-if "standard-error-port is binary"
    (with-fluids ((%default-port-encoding "UTF-8"))
      (binary-port? (standard-error-port)))))


(with-test-prefix "8.2.6  Input and output ports"

  (pass-if "transcoded-port [output]"
    (let ((s "Hello\nÄÖÜ"))
      (bytevector=?
       (string->utf8 s)
       (call-with-bytevector-output-port
         (lambda (bv-port)
           (call-with-port (transcoded-port bv-port (make-transcoder (utf-8-codec)))
             (lambda (utf8-port)
               (put-string utf8-port s))))))))

  (pass-if "transcoded-port [input]"
    (let ((s "Hello\nÄÖÜ"))
      (string=?
       s
       (get-string-all
        (transcoded-port (open-bytevector-input-port (string->utf8 s))
                         (make-transcoder (utf-8-codec)))))))

  (pass-if "transcoded-port [input line]"
    (string=? "ÄÖÜ"
              (get-line (transcoded-port
                         (open-bytevector-input-port (string->utf8 "ÄÖÜ\nFooBar"))
                         (make-transcoder (utf-8-codec))))))

  (pass-if "transcoded-port [error handling mode = raise]"
    (let* ((t  (make-transcoder (utf-8-codec) (native-eol-style)
                                (error-handling-mode raise)))
           (b  (open-bytevector-input-port #vu8(255 2 1)))
           (tp (transcoded-port b t)))
      (guard (c ((i/o-decoding-error? c)
                 (eq? (i/o-error-port c) tp)))
        (get-line tp))))

  (pass-if "transcoded-port [error handling mode = replace]"
    (let* ((t  (make-transcoder (utf-8-codec) (native-eol-style)
                                (error-handling-mode replace)))
           (b  (open-bytevector-input-port #vu8(255 1 2 3 103 110 117)))
           (tp (transcoded-port b t)))
      (string-suffix? "gnu" (get-line tp))))

  (pass-if "transcoded-port, output [error handling mode = raise]"
    (let-values (((p get)
                  (open-bytevector-output-port)))
      (let* ((t  (make-transcoder (latin-1-codec) (native-eol-style)
                                  (error-handling-mode raise)))
             (tp (transcoded-port p t)))
        (guard (c ((i/o-encoding-error? c)
                   (and (eq? (i/o-error-port c) tp)
                        (char=? (i/o-encoding-error-char c) #\λ)
                        (bytevector=? (get) (string->utf8 "The letter ")))))
          (put-string tp "The letter λ cannot be represented in Latin-1.")
          #f))))

  (pass-if "port-transcoder [binary port]"
    (not (port-transcoder (open-bytevector-input-port #vu8()))))

  (pass-if "port-transcoder [transcoded port]"
    (let* ((p (transcoded-port (open-bytevector-input-port (string->utf8 "foo"))
                               (make-transcoder (utf-8-codec))))
           (t (port-transcoder p)))
      (and t
           (transcoder-codec t)
           (eq? (native-eol-style)
                (transcoder-eol-style t))
           (eq? (error-handling-mode replace)
                (transcoder-error-handling-mode t))))))

(with-test-prefix "8.2.9  Textual input"
  
  (pass-if "get-string-n [short]"
    (let ((port (open-input-string "GNU Guile")))
      (string=? "GNU " (get-string-n port 4))))
  (pass-if "get-string-n [long]"
    (let ((port (open-input-string "GNU Guile")))
      (string=? "GNU Guile" (get-string-n port 256))))
  (pass-if "get-string-n [eof]"
    (let ((port (open-input-string "")))
      (eof-object? (get-string-n port 4))))

  (pass-if "get-string-n! [short]"
    (let ((port (open-input-string "GNU Guile"))
          (s (string-copy "Isn't XXX great?")))
      (and (= 3 (get-string-n! port s 6 3))
           (string=? s "Isn't GNU great?"))))

  (with-test-prefix "read error"
    (pass-if-condition "get-char" i/o-read-error?
      (get-char (make-failing-port)))
    (pass-if-condition "lookahead-char" i/o-read-error?
      (lookahead-char (make-failing-port)))
    ;; FIXME: these are not yet exception-correct
    #|
    (pass-if-condition "get-string-n" i/o-read-error?
      (get-string-n (make-failing-port) 5))
    (pass-if-condition "get-string-n!" i/o-read-error?
      (get-string-n! (make-failing-port) (make-string 5) 0 5))
    |#
    (pass-if-condition "get-string-all" i/o-read-error?
      (get-string-all (make-failing-port 100)))
    (pass-if-condition "get-line" i/o-read-error?
      (get-line (make-failing-port)))
    (pass-if-condition "get-datum" i/o-read-error?
      (get-datum (make-failing-port)))))

(with-test-prefix "8.2.12 Textual Output"
  
  (with-test-prefix "write error"
    (pass-if-condition "put-char" i/o-write-error?
      (put-char (make-failing-port) #\G))
    (pass-if-condition "put-string" i/o-write-error?
      (put-string (make-failing-port) "Hello World!"))
    (pass-if-condition "put-datum" i/o-write-error?
      (put-datum (make-failing-port) '(hello world!)))))

(with-test-prefix "8.3 Simple I/O"
  (with-test-prefix "read error"
    (pass-if-condition "read-char" i/o-read-error?
      (read-char (make-failing-port)))
    (pass-if-condition "peek-char" i/o-read-error?
      (peek-char (make-failing-port)))
    (pass-if-condition "read" i/o-read-error?
      (read (make-failing-port))))
  (with-test-prefix "write error"
    (pass-if-condition "display" i/o-write-error?
      (display "Hi there!" (make-failing-port)))
    (pass-if-condition "write" i/o-write-error?
      (write '(hi there!) (make-failing-port)))
    (pass-if-condition "write-char" i/o-write-error?
      (write-char #\G (make-failing-port)))
    (pass-if-condition "newline" i/o-write-error?
      (newline (make-failing-port))))
  (let ((filename (test-file)))
    ;; ensure the test file exists
    (call-with-output-file filename
      (lambda (port) (write "foo" port)))
    (pass-if "call-with-input-file [port is textual]"
      (call-with-input-file filename textual-port?))
    (pass-if-condition "call-with-input-file [exception: not-found]"
        i/o-file-does-not-exist-error?
      (call-with-input-file ",this-is-highly-unlikely-to-exist!"
        values))
    (pass-if-condition "call-with-output-file [exception: already-exists]"
        i/o-file-already-exists-error?
      (call-with-output-file filename
        values))
    (delete-file filename)))

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