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121 lines
5.4 KiB
HTML
121 lines
5.4 KiB
HTML
4 years ago
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<title>wcsftime (The Red Hat newlib C Library)</title>
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<body lang="en">
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<a name="wcsftime"></a>
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<div class="header">
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<p>
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Next: <a href="wcslcat.html#wcslcat" accesskey="n" rel="next">wcslcat</a>, Previous: <a href="wcscspn.html#wcscspn" accesskey="p" rel="prev">wcscspn</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="wcsftime_002d_002d_002dconvert-date-and-time-to-a-formatted-wide_002dcharacter-string"></a>
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<h3 class="section">6.14 <code>wcsftime</code>—convert date and time to a formatted wide-character string</h3>
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<a name="index-wcsftime"></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 <time.h>
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#include <wchar.h>
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size_t wcsftime(wchar_t *<var>s</var>, size_t <var>maxsize</var>,
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const wchar_t *<var>format</var>, const struct tm *<var>timp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>wcsftime</code> is equivalent to <code>strftime</code>, except that:
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</p><ul>
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<li> The argument s points to the initial element of an array of wide characters
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into which the generated output is to be placed.
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</li><li> The argument maxsize indicates the limiting number of wide characters.
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</li><li> The argument format is a wide-character string and the conversion specifiers
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are replaced by corresponding sequences of wide characters.
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</li><li> The return value indicates the number of wide characters.
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</li></ul>
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<p>(The difference in all of the above being wide characters versus regular
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characters.)
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See <code>strftime</code> for the details of the format specifiers.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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When the formatted time takes up no more than <var>maxsize</var> wide characters,
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the result is the length of the formatted wide string. Otherwise, if the
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formatting operation was abandoned due to lack of room, the result is
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<code>0</code>, and the wide-character string starting at <var>s</var> corresponds to just those
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parts of <code>*<var>format</var></code> that could be completely filled in within the
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<var>maxsize</var> limit.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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C99 and POSIX require <code>wcsftime</code>, but do not specify the contents of
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<code>*<var>s</var></code> when the formatted string would require more than
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<var>maxsize</var> characters. Unrecognized specifiers and fields of
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<code>timp</code> that are out of range cause undefined results. Since some
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formats expand to 0 bytes, it is wise to set <code>*<var>s</var></code> to a nonzero
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value beforehand to distinguish between failure and an empty string.
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This implementation does not support <code>s</code> being NULL, nor overlapping
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<code>s</code> and <code>format</code>.
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</p>
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<p><code>wcsftime</code> requires no supporting OS subroutines.
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</p>
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<br>
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<p><strong>See Also</strong><br>
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<code>strftime</code>
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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="wcslcat.html#wcslcat" accesskey="n" rel="next">wcslcat</a>, Previous: <a href="wcscspn.html#wcscspn" accesskey="p" rel="prev">wcscspn</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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