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| <h3 class="section">4.67 <code>ungetwc</code>—push wide character data back into a stream</h3> |
| |
| <p><a name="index-ungetwc-323"></a><a name="index-g_t_005fungetwc_005fr-324"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| #include <wchar.h> |
| wint_t ungetwc(wint_t <var>wc</var>, FILE *<var>stream</var>); |
| |
| wint_t _ungetwc_r(struct _reent *<var>reent</var>, wint_t <var>wc</var>, FILE *<var>stream</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>ungetwc</code> is used to return wide characters back to <var>stream</var> to be |
| read again. If <var>wc</var> is WEOF, the stream is unchanged. Otherwise, the |
| wide character <var>wc</var> is put back on the stream, and subsequent reads will see |
| the wide chars pushed back in reverse order. Pushed wide chars are lost if the |
| stream is repositioned, such as by <code>fseek</code>, <code>fsetpos</code>, or |
| <code>rewind</code>. |
| |
| <p>The underlying file is not changed, but it is possible to push back |
| something different than what was originally read. Ungetting a |
| character will clear the end-of-stream marker, and decrement the file |
| position indicator. Pushing back beyond the beginning of a file gives |
| unspecified behavior. |
| |
| <p>The alternate function <code>_ungetwc_r</code> is a reentrant version. The |
| extra argument <var>reent</var> is a pointer to a reentrancy structure. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The wide character pushed back, or <code>WEOF</code> on error. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| C99 |
| |
| <p><br> |
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