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<p>
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Next: <a href="vfprintf.html#vfprintf" accesskey="n" rel="next">vfprintf</a>, Previous: <a href="ungetc.html#ungetc" accesskey="p" rel="prev">ungetc</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</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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<a name="ungetwc_002d_002d_002dpush-wide-character-data-back-into-a-stream"></a>
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<h3 class="section">4.69 <code>ungetwc</code>—push wide character data back into a stream</h3>
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<a name="index-ungetwc"></a>
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<a name="index-_005fungetwc_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 <stdio.h>
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#include <wchar.h>
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wint_t ungetwc(wint_t <var>wc</var>, FILE *<var>stream</var>);
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wint_t _ungetwc_r(struct _reent *<var>reent</var>, wint_t <var>wc</var>, FILE *<var>stream</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>ungetwc</code> is used to return wide characters back to <var>stream</var> to be
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read again. If <var>wc</var> is WEOF, the stream is unchanged. Otherwise, the
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wide character <var>wc</var> is put back on the stream, and subsequent reads will see
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the wide chars pushed back in reverse order. Pushed wide chars are lost if the
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stream is repositioned, such as by <code>fseek</code>, <code>fsetpos</code>, or
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<code>rewind</code>.
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</p>
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<p>The underlying file is not changed, but it is possible to push back
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something different than what was originally read. Ungetting a
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character will clear the end-of-stream marker, and decrement the file
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position indicator. Pushing back beyond the beginning of a file gives
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unspecified behavior.
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</p>
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<p>The alternate function <code>_ungetwc_r</code> is a reentrant version. The
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extra argument <var>reent</var> is a pointer to a reentrancy structure.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The wide character pushed back, or <code>WEOF</code> on error.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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C99
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</p>
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<br>
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