297 lines
26 KiB
HTML
297 lines
26 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>rnrs io ports (Guile Reference Manual)</title>
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<meta name="description" content="rnrs io ports (Guile Reference Manual)">
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<meta name="keywords" content="rnrs io ports (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="R6RS-Standard-Libraries.html" rel="up" title="R6RS Standard Libraries">
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<link href="R6RS-File-Ports.html" rel="next" title="R6RS File Ports">
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<link href="R6RS-Transcoders.html" rel="prev" title="R6RS Transcoders">
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="rnrs-io-ports">
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<div class="nav-panel">
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<p>
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Next: <a href="R6RS-File-Ports.html" accesskey="n" rel="next">R6RS File Ports</a>, Previous: <a href="R6RS-Transcoders.html" accesskey="p" rel="prev">Transcoders</a>, Up: <a href="R6RS-Standard-Libraries.html" accesskey="u" rel="up">R6RS Standard Libraries</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsubsection" id="rnrs-io-ports-1"><span>7.6.2.16 rnrs io ports<a class="copiable-link" href="#rnrs-io-ports-1"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-R6RS-2"></a>
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<a class="index-entry-id" id="index-R6RS-ports"></a>
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<p>Guile’s binary and textual port interface was heavily inspired by R6RS,
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so many R6RS port interfaces are documented elsewhere. Note that R6RS
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ports are not disjoint from Guile’s native ports, so Guile-specific
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procedures will work on ports created using the R6RS API, and vice
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versa. Also note that in Guile, all ports are both textual and binary.
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See <a class="xref" href="Input-and-Output.html">Input and Output</a>, for more on Guile’s core port API. The R6RS
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ports module wraps Guile’s I/O routines in a helper that will translate
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native Guile exceptions to R6RS conditions; See <a class="xref" href="R6RS-I_002fO-Conditions.html">I/O Conditions</a>,
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for more. See <a class="xref" href="R6RS-File-Ports.html">R6RS File Ports</a>, for documentation on the R6RS file
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port interface.
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</p>
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<p><em class="emph">Note</em>: The implementation of this R6RS API is not complete yet.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-eof_002dobject_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">eof-object?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-eof_002dobject_003f-1"> ¶</a></span></dt>
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<dd><p>See <a class="xref" href="Binary-I_002fO.html">Binary I/O</a>, for documentation.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-eof_002dobject"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">eof-object</strong><a class="copiable-link" href="#index-eof_002dobject"> ¶</a></span></dt>
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<dd><p>Return the end-of-file (EOF) object.
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(eof-object? (eof-object))
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⇒ #t
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-port_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">port?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-port_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-input_002dport_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">input-port?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-input_002dport_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-output_002dport_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">output-port?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-output_002dport_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-call_002dwith_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">call-with-port</strong> <var class="def-var-arguments">port proc</var><a class="copiable-link" href="#index-call_002dwith_002dport-1"> ¶</a></span></dt>
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<dd><p>See <a class="xref" href="Ports.html">Ports</a>, for documentation.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-port_002dtranscoder"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">port-transcoder</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-port_002dtranscoder"> ¶</a></span></dt>
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<dd><p>Return a transcoder associated with the encoding of <var class="var">port</var>.
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See <a class="xref" href="Encoding.html">Encoding</a>, and See <a class="xref" href="R6RS-Transcoders.html">Transcoders</a>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-binary_002dport_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">binary-port?</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-binary_002dport_003f"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">port</var> appears to be a binary port, else return
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<code class="code">#f</code>. Note that Guile does not currently distinguish between
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binary and textual ports, so this predicate is not a reliable indicator
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of whether the port was created as a binary port. Currently, it returns
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<code class="code">#t</code> if and only if the port encoding is “ISO-8859-1”, because
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Guile uses this encoding when creating a binary port. See <a class="xref" href="Encoding.html">Encoding</a>,
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for more details.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-textual_002dport_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">textual-port?</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-textual_002dport_003f"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">port</var> appears to be a textual port, else return
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<code class="code">#f</code>. Note that Guile does not currently distinguish between
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binary and textual ports, so this predicate is not a reliable indicator
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of whether the port was created as a textual port. Currently, it always
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returns <code class="code">#t</code>, because all ports can be used for textual I/O in
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Guile. See <a class="xref" href="Encoding.html">Encoding</a>, for more details.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-transcoded_002dport"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">transcoded-port</strong> <var class="def-var-arguments">binary-port transcoder</var><a class="copiable-link" href="#index-transcoded_002dport"> ¶</a></span></dt>
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<dd><p>The <code class="code">transcoded-port</code> procedure
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returns a new textual port with the specified <var class="var">transcoder</var>.
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Otherwise the new textual port’s state is largely the same as
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that of <var class="var">binary-port</var>.
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If <var class="var">binary-port</var> is an input port, the new textual
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port will be an input port and
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will transcode the bytes that have not yet been read from
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<var class="var">binary-port</var>.
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If <var class="var">binary-port</var> is an output port, the new textual
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port will be an output port and
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will transcode output characters into bytes that are
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written to the byte sink represented by <var class="var">binary-port</var>.
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</p>
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<p>As a side effect, however, <code class="code">transcoded-port</code>
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closes <var class="var">binary-port</var> in
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a special way that allows the new textual port to continue to
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use the byte source or sink represented by <var class="var">binary-port</var>,
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even though <var class="var">binary-port</var> itself is closed and cannot
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be used by the input and output operations described in this
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chapter.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-port_002dposition"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">port-position</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-port_002dposition"> ¶</a></span></dt>
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<dd><p>Equivalent to <code class="code">(seek <var class="var">port</var> 0 SEEK_CUR)</code>. See <a class="xref" href="Random-Access.html">Random Access</a>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-port_002dhas_002dport_002dposition_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">port-has-port-position?</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-port_002dhas_002dport_002dposition_003f"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> is <var class="var">port</var> supports <code class="code">port-position</code>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-set_002dport_002dposition_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">set-port-position!</strong> <var class="def-var-arguments">port offset</var><a class="copiable-link" href="#index-set_002dport_002dposition_0021"> ¶</a></span></dt>
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<dd><p>Equivalent to <code class="code">(seek <var class="var">port</var> <var class="var">offset</var> SEEK_SET)</code>.
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See <a class="xref" href="Random-Access.html">Random Access</a>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-port_002dhas_002dset_002dport_002dposition_0021_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">port-has-set-port-position!?</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-port_002dhas_002dset_002dport_002dposition_0021_003f"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> is <var class="var">port</var> supports <code class="code">set-port-position!</code>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-port_002deof_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">port-eof?</strong> <var class="def-var-arguments">input-port</var><a class="copiable-link" href="#index-port_002deof_003f"> ¶</a></span></dt>
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<dd><p>Equivalent to <code class="code">(eof-object? (lookahead-u8 <var class="var">input-port</var>))</code>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-standard_002dinput_002dport"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">standard-input-port</strong><a class="copiable-link" href="#index-standard_002dinput_002dport"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-standard_002doutput_002dport"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">standard-output-port</strong><a class="copiable-link" href="#index-standard_002doutput_002dport"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-standard_002derror_002dport"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">standard-error-port</strong><a class="copiable-link" href="#index-standard_002derror_002dport"> ¶</a></span></dt>
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<dd><p>Returns a fresh binary input port connected to standard input, or a
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binary output port connected to the standard output or standard error,
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respectively. Whether the port supports the <code class="code">port-position</code> and
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<code class="code">set-port-position!</code> operations is implementation-dependent.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-current_002dinput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">current-input-port</strong><a class="copiable-link" href="#index-current_002dinput_002dport-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-current_002doutput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">current-output-port</strong><a class="copiable-link" href="#index-current_002doutput_002dport-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-current_002derror_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">current-error-port</strong><a class="copiable-link" href="#index-current_002derror_002dport-1"> ¶</a></span></dt>
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<dd><p>See <a class="xref" href="Default-Ports.html">Default Ports for Input, Output and Errors</a>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-open_002dbytevector_002dinput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">open-bytevector-input-port</strong> <var class="def-var-arguments">bv [transcoder]</var><a class="copiable-link" href="#index-open_002dbytevector_002dinput_002dport-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-open_002dbytevector_002doutput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">open-bytevector-output-port</strong> <var class="def-var-arguments">[transcoder]</var><a class="copiable-link" href="#index-open_002dbytevector_002doutput_002dport-1"> ¶</a></span></dt>
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<dd><p>See <a class="xref" href="Bytevector-Ports.html">Bytevector Ports</a>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-make_002dcustom_002dbinary_002dinput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-custom-binary-input-port</strong> <var class="def-var-arguments">id read! get-position set-position! close</var><a class="copiable-link" href="#index-make_002dcustom_002dbinary_002dinput_002dport-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dcustom_002dbinary_002doutput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-custom-binary-output-port</strong> <var class="def-var-arguments">id write! get-position set-position! close</var><a class="copiable-link" href="#index-make_002dcustom_002dbinary_002doutput_002dport-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dcustom_002dbinary_002dinput_002foutput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-custom-binary-input/output-port</strong> <var class="def-var-arguments">id read! write! get-position set-position! close</var><a class="copiable-link" href="#index-make_002dcustom_002dbinary_002dinput_002foutput_002dport-1"> ¶</a></span></dt>
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<dd><p>See <a class="xref" href="Custom-Ports.html">Custom Ports</a>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-make_002dcustom_002dtextual_002dinput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-custom-textual-input-port</strong> <var class="def-var-arguments">id read! get-position set-position! close</var><a class="copiable-link" href="#index-make_002dcustom_002dtextual_002dinput_002dport-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-make_002dcustom_002dtextual_002doutput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-custom-textual-output-port</strong> <var class="def-var-arguments">id write! get-position set-position! close</var><a class="copiable-link" href="#index-make_002dcustom_002dtextual_002doutput_002dport-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-make_002dcustom_002dtextual_002dinput_002foutput_002dport-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-custom-textual-input/output-port</strong> <var class="def-var-arguments">id read! write! get-position set-position! close</var><a class="copiable-link" href="#index-make_002dcustom_002dtextual_002dinput_002foutput_002dport-1"> ¶</a></span></dt>
|
||
|
|
<dd><p>See <a class="xref" href="Custom-Ports.html">Custom Ports</a>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<dt class="deffn" id="index-get_002du8-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-u8</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-get_002du8-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-lookahead_002du8-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">lookahead-u8</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-lookahead_002du8-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dbytevector_002dn-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-bytevector-n</strong> <var class="def-var-arguments">port count</var><a class="copiable-link" href="#index-get_002dbytevector_002dn-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dbytevector_002dn_0021-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-bytevector-n!</strong> <var class="def-var-arguments">port bv start count</var><a class="copiable-link" href="#index-get_002dbytevector_002dn_0021-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dbytevector_002dsome-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-bytevector-some</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-get_002dbytevector_002dsome-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dbytevector_002dall-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-bytevector-all</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-get_002dbytevector_002dall-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-put_002du8-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">put-u8</strong> <var class="def-var-arguments">port octet</var><a class="copiable-link" href="#index-put_002du8-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-put_002dbytevector-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">put-bytevector</strong> <var class="def-var-arguments">port bv [start [count]]</var><a class="copiable-link" href="#index-put_002dbytevector-1"> ¶</a></span></dt>
|
||
|
|
<dd><p>See <a class="xref" href="Binary-I_002fO.html">Binary I/O</a>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<dt class="deffn" id="index-get_002dchar-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-char</strong> <var class="def-var-arguments">textual-input-port</var><a class="copiable-link" href="#index-get_002dchar-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-lookahead_002dchar-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">lookahead-char</strong> <var class="def-var-arguments">textual-input-port</var><a class="copiable-link" href="#index-lookahead_002dchar-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dstring_002dn-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-string-n</strong> <var class="def-var-arguments">textual-input-port count</var><a class="copiable-link" href="#index-get_002dstring_002dn-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dstring_002dn_0021-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-string-n!</strong> <var class="def-var-arguments">textual-input-port string start count</var><a class="copiable-link" href="#index-get_002dstring_002dn_0021-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dstring_002dall-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-string-all</strong> <var class="def-var-arguments">textual-input-port</var><a class="copiable-link" href="#index-get_002dstring_002dall-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-get_002dline-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-line</strong> <var class="def-var-arguments">textual-input-port</var><a class="copiable-link" href="#index-get_002dline-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-put_002dchar-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">put-char</strong> <var class="def-var-arguments">port char</var><a class="copiable-link" href="#index-put_002dchar-1"> ¶</a></span></dt>
|
||
|
|
<dt class="deffnx def-cmd-deffn" id="index-put_002dstring-3"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">put-string</strong> <var class="def-var-arguments">port string [start [count]]</var><a class="copiable-link" href="#index-put_002dstring-3"> ¶</a></span></dt>
|
||
|
|
<dd><p>See <a class="xref" href="Textual-I_002fO.html">Textual I/O</a>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<dt class="deffn" id="index-get_002ddatum"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">get-datum</strong> <var class="def-var-arguments">textual-input-port count</var><a class="copiable-link" href="#index-get_002ddatum"> ¶</a></span></dt>
|
||
|
|
<dd><p>Reads an external representation from <var class="var">textual-input-port</var> and returns the
|
||
|
|
datum it represents. The <code class="code">get-datum</code> procedure returns the next
|
||
|
|
datum that can be parsed from the given <var class="var">textual-input-port</var>, updating
|
||
|
|
<var class="var">textual-input-port</var> to point exactly past the end of the external
|
||
|
|
representation of the object.
|
||
|
|
</p>
|
||
|
|
<p>Any <em class="emph">interlexeme space</em> (comment or whitespace, see <a class="pxref" href="Scheme-Syntax.html">Scheme Syntax: Standard and Guile Extensions</a>) in the input is first skipped. If an end of file occurs after
|
||
|
|
the interlexeme space, the end-of-file object is returned.
|
||
|
|
</p>
|
||
|
|
<p>If a character inconsistent with an external representation is
|
||
|
|
encountered in the input, an exception with condition types
|
||
|
|
<code class="code">&lexical</code> and <code class="code">&i/o-read</code> is raised. Also, if the end of
|
||
|
|
file is encountered after the beginning of an external representation,
|
||
|
|
but the external representation is incomplete and therefore cannot be
|
||
|
|
parsed, an exception with condition types <code class="code">&lexical</code> and
|
||
|
|
<code class="code">&i/o-read</code> is raised.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<dt class="deffn" id="index-put_002ddatum"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">put-datum</strong> <var class="def-var-arguments">textual-output-port datum</var><a class="copiable-link" href="#index-put_002ddatum"> ¶</a></span></dt>
|
||
|
|
<dd><p><var class="var">datum</var> should be a datum value. The <code class="code">put-datum</code> procedure
|
||
|
|
writes an external representation of <var class="var">datum</var> to
|
||
|
|
<var class="var">textual-output-port</var>. The specific external representation is
|
||
|
|
implementation-dependent. However, whenever possible, an implementation
|
||
|
|
should produce a representation for which <code class="code">get-datum</code>, when reading
|
||
|
|
the representation, will return an object equal (in the sense of
|
||
|
|
<code class="code">equal?</code>) to <var class="var">datum</var>.
|
||
|
|
</p>
|
||
|
|
<blockquote class="quotation">
|
||
|
|
<p><b class="b">Note:</b> Not all datums may allow producing an external representation for which
|
||
|
|
<code class="code">get-datum</code> will produce an object that is equal to the
|
||
|
|
original. Specifically, NaNs contained in <var class="var">datum</var> may make
|
||
|
|
this impossible.
|
||
|
|
</p></blockquote>
|
||
|
|
|
||
|
|
<blockquote class="quotation">
|
||
|
|
<p><b class="b">Note:</b> The <code class="code">put-datum</code> procedure merely writes the external
|
||
|
|
representation, but no trailing delimiter. If <code class="code">put-datum</code> is
|
||
|
|
used to write several subsequent external representations to an
|
||
|
|
output port, care should be taken to delimit them properly so they can
|
||
|
|
be read back in by subsequent calls to <code class="code">get-datum</code>.
|
||
|
|
</p></blockquote>
|
||
|
|
</dd></dl>
|
||
|
|
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<dt class="deffn" id="index-flush_002doutput_002dport"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">flush-output-port</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-flush_002doutput_002dport"> ¶</a></span></dt>
|
||
|
|
<dd><p>See <a class="xref" href="Buffering.html">Buffering</a>, for documentation on <code class="code">force-output</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<div class="nav-panel">
|
||
|
|
<p>
|
||
|
|
Next: <a href="R6RS-File-Ports.html">R6RS File Ports</a>, Previous: <a href="R6RS-Transcoders.html">Transcoders</a>, Up: <a href="R6RS-Standard-Libraries.html">R6RS Standard Libraries</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
|
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|
|
</div>
|
||
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</body>
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</html>
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