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130 lines
5.7 KiB
HTML
130 lines
5.7 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>mbsrtowcs (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="Stdlib.html#Stdlib" rel="up" title="Stdlib">
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<body lang="en">
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<a name="mbsrtowcs"></a>
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<div class="header">
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<p>
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Next: <a href="mbstowcs.html#mbstowcs" accesskey="n" rel="next">mbstowcs</a>, Previous: <a href="mblen.html#mblen" accesskey="p" rel="prev">mblen</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</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="mbsrtowcs_002c-mbsnrtowcs_002d_002d_002dconvert-a-character-string-to-a-wide_002dcharacter-string"></a>
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<h3 class="section">2.28 <code>mbsrtowcs</code>, <code>mbsnrtowcs</code>—convert a character string to a wide-character string</h3>
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<a name="index-mbsrtowcs"></a>
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<a name="index-_005fmbsrtowcs_005fr"></a>
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<a name="index-mbsnrtowcs"></a>
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<a name="index-_005fmbsnrtowcs_005fr"></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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size_t mbsrtowcs(wchar_t *__restrict <var>dst</var>,
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const char **__restrict <var>src</var>,
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size_t <var>len</var>,
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mbstate_t *__restrict <var>ps</var>);
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#include <wchar.h>
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size_t _mbsrtowcs_r(struct _reent *<var>ptr</var>, wchar_t *<var>dst</var>,
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const char **<var>src</var>, size_t <var>len</var>,
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mbstate_t *<var>ps</var>);
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#include <wchar.h>
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size_t mbsnrtowcs(wchar_t *__ restrict <var>dst</var>,
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const char **__restrict <var>src</var>, size_t <var>nms</var>,
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size_t <var>len</var>, mbstate_t *__restrict <var>ps</var>);
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#include <wchar.h>
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size_t _mbsnrtowcs_r(struct _reent *<var>ptr</var>, wchar_t *<var>dst</var>,
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const char **<var>src</var>, size_t <var>nms</var>,
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size_t <var>len</var>, mbstate_t *<var>ps</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>mbsrtowcs</code> function converts a sequence of multibyte characters
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pointed to indirectly by <var>src</var> into a sequence of corresponding wide
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characters and stores at most <var>len</var> of them in the wchar_t array pointed
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to by <var>dst</var>, until it encounters a terminating null character (’\0’).
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</p>
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<p>If <var>dst</var> is NULL, no characters are stored.
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</p>
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<p>If <var>dst</var> is not NULL, the pointer pointed to by <var>src</var> is updated to point
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to the character after the one that conversion stopped at. If conversion
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stops because a null character is encountered, *<var>src</var> is set to NULL.
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</p>
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<p>The mbstate_t argument, <var>ps</var>, is used to keep track of the shift state. If
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it is NULL, <code>mbsrtowcs</code> uses an internal, static mbstate_t object, which
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is initialized to the initial conversion state at program startup.
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</p>
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<p>The <code>mbsnrtowcs</code> function behaves identically to <code>mbsrtowcs</code>, except that
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conversion stops after reading at most <var>nms</var> bytes from the buffer pointed
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to by <var>src</var>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The <code>mbsrtowcs</code> and <code>mbsnrtowcs</code> functions return the number of wide
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characters stored in the array pointed to by <var>dst</var> if successful, otherwise
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it returns (size_t)-1.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>mbsrtowcs</code> is defined by the C99 standard.
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<code>mbsnrtowcs</code> is defined by the POSIX.1-2008 standard.
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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="mbstowcs.html#mbstowcs" accesskey="n" rel="next">mbstowcs</a>, Previous: <a href="mblen.html#mblen" accesskey="p" rel="prev">mblen</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</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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