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131 lines
5.9 KiB
HTML
131 lines
5.9 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>strtok (The Red Hat newlib C Library)</title>
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Strings.html#Strings" rel="up" title="Strings">
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</head>
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<body lang="en">
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<a name="strtok"></a>
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<div class="header">
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<p>
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Next: <a href="strupr.html#strupr" accesskey="n" rel="next">strupr</a>, Previous: <a href="strstr.html#strstr" accesskey="p" rel="prev">strstr</a>, Up: <a href="Strings.html#Strings" accesskey="u" rel="up">Strings</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="strtok_002c-strtok_005fr_002c-strsep_002d_002d_002dget-next-token-from-a-string"></a>
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<h3 class="section">5.42 <code>strtok</code>, <code>strtok_r</code>, <code>strsep</code>—get next token from a string</h3>
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<a name="index-strtok"></a>
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<a name="index-strtok_005fr"></a>
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<a name="index-strsep"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <string.h>
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char *strtok(char *restrict <var>source</var>,
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const char *restrict <var>delimiters</var>);
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char *strtok_r(char *restrict <var>source</var>,
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const char *restrict <var>delimiters</var>,
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char **<var>lasts</var>);
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char *strsep(char **<var>source_ptr</var>, const char *<var>delimiters</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>strtok</code> function is used to isolate sequential tokens in a
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null-terminated string, <code>*<var>source</var></code>. These tokens are delimited
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in the string by at least one of the characters in <code>*<var>delimiters</var></code>.
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The first time that <code>strtok</code> is called, <code>*<var>source</var></code> should be
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specified; subsequent calls, wishing to obtain further tokens from
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the same string, should pass a null pointer instead. The separator
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string, <code>*<var>delimiters</var></code>, must be supplied each time and may
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change between calls.
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</p>
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<p>The <code>strtok</code> function returns a pointer to the beginning of each
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subsequent token in the string, after replacing the separator
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character itself with a null character. When no more tokens remain,
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a null pointer is returned.
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</p>
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<p>The <code>strtok_r</code> function has the same behavior as <code>strtok</code>, except
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a pointer to placeholder <code>*<var>lasts</var></code> must be supplied by the caller.
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</p>
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<p>The <code>strsep</code> function is similar in behavior to <code>strtok</code>, except
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a pointer to the string pointer must be supplied <code><var>source_ptr</var></code> and
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the function does not skip leading delimiters. When the string starts
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with a delimiter, the delimiter is changed to the null character and
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the empty string is returned. Like <code>strtok_r</code> and <code>strtok</code>, the
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<code>*<var>source_ptr</var></code> is updated to the next character following the
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last delimiter found or NULL if the end of string is reached with
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no more delimiters.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>strtok</code>, <code>strtok_r</code>, and <code>strsep</code> all return a pointer to the
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next token, or <code>NULL</code> if no more tokens can be found. For
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<code>strsep</code>, a token may be the empty string.
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</p>
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<br>
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<p><strong>Notes</strong><br>
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<code>strtok</code> is unsafe for multi-threaded applications. <code>strtok_r</code>
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and <code>strsep</code> are thread-safe and should be used instead.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>strtok</code> is ANSI C.
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<code>strtok_r</code> is POSIX.
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<code>strsep</code> is a BSD extension.
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</p>
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<p><code>strtok</code>, <code>strtok_r</code>, and <code>strsep</code> require no supporting OS subroutines.
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</p>
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<br>
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<hr>
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<div class="header">
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<p>
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Next: <a href="strupr.html#strupr" accesskey="n" rel="next">strupr</a>, Previous: <a href="strstr.html#strstr" accesskey="p" rel="prev">strstr</a>, Up: <a href="Strings.html#Strings" accesskey="u" rel="up">Strings</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" 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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