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| <h3 class="section">4.13 <code>fgetwc</code>, <code>getwc</code>—get a wide character from a file or stream</h3> |
| |
| <p><a name="index-fgetwc-170"></a><a name="index-g_t_005ffgetwc_005fr-171"></a><a name="index-getwc-172"></a><a name="index-g_t_005fgetwc_005fr-173"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| #include <wchar.h> |
| wint_t fgetwc(FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| #include <wchar.h> |
| wint_t _fgetwc_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| #include <wchar.h> |
| wint_t getwc(FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| #include <wchar.h> |
| wint_t _getwc_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| Use <code>fgetwc</code> to get the next wide character from the file or stream |
| identified by <var>fp</var>. As a side effect, <code>fgetwc</code> advances the file's |
| current position indicator. |
| |
| <p>The <code>getwc</code> function or macro functions identically to <code>fgetwc</code>. It |
| may be implemented as a macro, and may evaluate its argument more than |
| once. There is no reason ever to use it. |
| |
| <p><code>_fgetwc_r</code> and <code>_getwc_r</code> are simply reentrant versions of |
| <code>fgetwc</code> and <code>getwc</code> that are passed the additional reentrant |
| structure pointer argument: <var>ptr</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The next wide character cast to <code>wint_t</code>), unless there is no more data, |
| or the host system reports a read error; in either of these situations, |
| <code>fgetwc</code> and <code>getwc</code> return <code>WEOF</code>. |
| |
| <p>You can distinguish the two situations that cause an <code>EOF</code> result by |
| using the <code>ferror</code> and <code>feof</code> functions. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| C99, POSIX.1-2001 |
| |
| <p><br> |
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