65 lines
2.5 KiB
HTML
65 lines
2.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Originally converted to HTML using LaTeX2HTML 95 (Thu Jan 19 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE> read (FUNCTION)</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" read (FUNCTION)">
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<meta name="keywords" value="lp">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<BR> <HR>
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<A HREF="node-rest.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A>
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<A HREF="node72.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A>
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<A HREF="node109.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <BR>
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<A HREF="lp.html"><B>Contents</B></A>
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<B> Next:</B>
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<A HREF="node-rest.html"> rest (FUNCTION)</A>
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<B>Up:</B>
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<A HREF="node72.html"> Appendix: Selected Lisp </A>
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<B> Previous:</B>
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<A HREF="node109.html"> or (FUNCTION)</A>
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<BR> <HR> <P>
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<H1> read (FUNCTION)</H1>
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<P>
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<b> Format:</b>
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<tt> (read <instream> </tt>
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<tt> <eof-error> </tt>
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<tt> <eof-value> </tt>
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<tt> <recursive> )</tt>
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<P>
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<b> Required arguments:</b>
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none
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<P>
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<b> Optional arguments:</b>
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4
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<P>
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<tt> <instream> </tt>: an expression which returns an input stream
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<tt> <eof-error> </tt>: any Lisp expression
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<tt> <eof-value> </tt>: any Lisp expression
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<tt> <recursive> </tt>: any Lisp expression
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<P>
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Called with no arguments, read waits for input from the standard input
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(usually the keyboard) and returns a Lisp object. If <tt> <instream> </tt> is
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specified, input is taken from the stream rather than standard input. If
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<tt> <eof-error> </tt> is specified it controls what happens if an end of file
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is encountered in the middle of a ``read.'' If <tt> <eof-error> </tt> is nil,
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no error results, and the result of <tt> <eof-value> </tt> is returned by ``read.''
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If <tt> <eof-error> </tt> is not NIL, then encountering the end of a file during a
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read will cause an error to occur. <tt> <recursive> </tt> controls the kind
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of error that is signalled when an end of file is encountered. If
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<tt> <recursive> </tt> is specified and is not NIL, then the end of file is
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reported to have occurred in the middle of reading in an object. If it is
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NIL, the the end of file is reported as occurring between objects.
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<P>
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<b> Examples:</b> See <a href="node58.html">chapter 5</a>.
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<P>
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<BR> <HR>
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<P>
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<ADDRESS>
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<I>© Colin Allen & Maneesh Dhagat <BR>
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March 2007 </I>
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</ADDRESS>
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</BODY>
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