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125 lines
5.6 KiB
HTML
125 lines
5.6 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>wcstok (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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</head>
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<body lang="en">
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<a name="wcstok"></a>
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<div class="header">
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<p>
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Next: <a href="wcswidth.html#wcswidth" accesskey="n" rel="next">wcswidth</a>, Previous: <a href="wcsstr.html#wcsstr" accesskey="p" rel="prev">wcsstr</a>, Up: <a href="Wchar-strings.html#Wchar-strings" accesskey="u" rel="up">Wchar 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="wcstok_002d_002d_002dget-next-token-from-a-string"></a>
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<h3 class="section">6.27 <code>wcstok</code>—get next token from a string</h3>
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<a name="index-wcstok"></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 <wchar.h>
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wchar_t *wcstok(wchar_t *__restrict <var>source</var>,
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const wchar_t *__restrict <var>delimiters</var>,
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wchar_t **__restrict <var>lasts</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>wcstok</code> function is the wide-character equivalent of the
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<code>strtok_r</code> function (which in turn is the same as the <code>strtok</code>
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function with an added argument to make it thread-safe).
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</p>
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<p>The <code>wcstok</code> function is used to isolate (one at a time)
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sequential tokens in a null-terminated wide-character string,
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<code>*<var>source</var></code>. A token is defined as a substring not containing
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any wide-characters from <code>*<var>delimiters</var></code>.
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</p>
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<p>The first time that <code>wcstok</code> is called, <code>*<var>source</var></code> should
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be specified with the wide-character string to be searched, and
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<code>*<var>lasts</var></code>–but not <code>lasts</code>, which must be non-NULL–may be
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random; subsequent calls, wishing to obtain further tokens from
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the same string, should pass a null pointer for <code>*<var>source</var></code>
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instead but must supply <code>*<var>lasts</var></code> unchanged from the last
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call. The separator wide-character string, <code>*<var>delimiters</var></code>,
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must be supplied each time and may change between calls.
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A pointer to placeholder <code>*<var>lasts</var></code> must be supplied by
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the caller, and is set each time as needed to save the state
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by <code>wcstok</code>. Every call to <code>wcstok</code> with <code>*<var>source</var></code>
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== <code>NULL</code> must pass the value of <code>*<var>lasts</var></code> as last set
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by <code>wcstok</code>.
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</p>
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<p>The <code>wcstok</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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wide-character itself with a null wide-character. When no more tokens
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remain, a null pointer is returned.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>wcstok</code> returns a pointer to the first wide character of a token, or
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<code>NULL</code> if there is no token.
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</p>
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<br>
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<p><strong>Notes</strong><br>
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<code>wcstok</code> is thread-safe (unlike <code>strtok</code>, but like <code>strtok_r</code>).
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<code>wcstok</code> writes into the string being searched.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>wcstok</code> is C99 and POSIX.1-2001.
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</p>
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<p><code>wcstok</code> requires 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="wcswidth.html#wcswidth" accesskey="n" rel="next">wcswidth</a>, Previous: <a href="wcsstr.html#wcsstr" accesskey="p" rel="prev">wcsstr</a>, Up: <a href="Wchar-strings.html#Wchar-strings" accesskey="u" rel="up">Wchar 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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