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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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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