102 lines
3.5 KiB
HTML
102 lines
3.5 KiB
HTML
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-->
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<html>
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<head>
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<title>strtok</title>
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<link rel="stylesheet" type="text/css" media="all" href="../man.css">
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</head>
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<body bgcolor=#ffffff>
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<h2 align=center>strtok</h2>
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<h4 align=center>OS/161 Reference Manual</h4>
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<h3>Name</h3>
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<p>
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strtok - tokenize string
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</p>
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<h3>Library</h3>
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<p>
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Standard C Library (libc, -lc)
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>#include <string.h></tt><br>
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<br>
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<tt>char *</tt><br>
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<tt>strtok(char *</tt><em>string</em><tt>,
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const char *</tt><em>separators</em><tt>);</tt>
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</p>
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<h3>Description</h3>
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<p>
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<tt>strtok</tt> splits up the string <em>string</em> into fields using
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the characters found in <em>separators</em> as delimiters. The
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delimiters found are discarded. Multiple delimiter characters in a row
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are treated as a single delimiter.
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</p>
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<p>
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When first called, <tt>strtok</tt> returns the first field of
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<em>string</em>. To retrieve successive fields of <em>string</em>,
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call <tt>strtok</tt> again repeatedly, passing <tt>NULL</tt> as the
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first argument. When no more fields are left, <tt>NULL</tt> is
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returned. If the string is empty or contains only delimiters,
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<tt>NULL</tt> will be returned on the first call.
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</p>
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<h3>Cautions</h3>
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<p>
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Note that the state used to remember <em>string</em> across calls is
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global. Thus, <tt>strtok</tt> cannot be used from more than one thread
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at a time in a multithreaded program, nor can it be used in a
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subroutine called from within a loop that itself uses
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<tt>strtok</tt>. If these restrictions are problematic, use <A
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HREF=strtok_r.html>strtok_r</A>.
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</p>
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<p>
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The behavior if strtok is called again without passing a new
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<em>string</em> after it has returned <tt>NULL</tt> is undefined.
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</p>
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<p>
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The behavior if strtok is called with the first argument <tt>NULL</tt>
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without having first passed a valid <em>string</em> is also undefined.
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</p>
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<h3>Return Values</h3>
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<p>
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<tt>strtok</tt> returns successive components of the passed-in string,
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and <tt>NULL</tt> when no more remain.
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</p>
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</body>
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</html>
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