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implement port-eof?

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* module/rnrs/io/ports.scm (port-eof?): Implement.
* module/rnrs.scm: Re-export port-eof?.

* test-suite/tests/r6rs-ports.test ("7.2.5 End-of-File Object"): Add
  test.

Thanks to Göran Weinholt for the report.
This commit is contained in:
Andy Wingo 2011-01-21 08:27:08 +01:00
parent dc78bee588
commit b04f841d5f
3 changed files with 15 additions and 5 deletions
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5
module/rnrs.scm
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@ -1,6 +1,6 @@
;;; rnrs.scm --- The R6RS composite library
;; Copyright (C) 2010 Free Software Foundation, Inc.
;; Copyright (C) 2010, 2011 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
@ -165,7 +165,8 @@
make-transcoder transcoder-codec native-transcoder
latin-1-codec utf-8-codec utf-16-codec
eof-object? port? input-port? output-port? eof-object port-transcoder
eof-object? port? input-port? output-port? eof-object port-eof?
port-transcoder
binary-port? transcoded-port port-position set-port-position!
port-has-port-position? port-has-set-port-position!?
close-port call-with-port

8
module/rnrs/io/ports.scm
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@ -1,6 +1,6 @@
;;;; ports.scm --- R6RS port API -*- coding: utf-8 -*-
;;;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
;;;; Copyright (C) 2009, 2010, 2011 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
@ -37,6 +37,7 @@
;; input & output ports
port? input-port? output-port?
port-eof?
port-transcoder binary-port? transcoded-port
port-position set-port-position!
port-has-port-position? port-has-set-port-position!?
@ -191,6 +192,11 @@
;; So far, we don't support transcoders other than the binary transcoder.
#t)
(define (port-eof? port)
(eof-object? (if (binary-port? port)
(lookahead-u8 port)
(lookahead-char port))))
(define (transcoded-port port transcoder)
"Return a new textual port based on @var{port}, using
@var{transcoder} to encode and decode data written to or

7
test-suite/tests/r6rs-ports.test
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@ -1,6 +1,6 @@
;;;; r6rs-ports.test --- R6RS I/O port tests. -*- coding: utf-8; -*-
;;;;
;;;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
;;;; Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
;;;; Ludovic Courtès
;;;;
;;;; This library is free software; you can redistribute it and/or
@ -35,7 +35,10 @@
(pass-if "eof-object"
(and (eqv? (eof-object) (eof-object))
(eq? (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"