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113 lines
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113 lines
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<a name="stdio_005fext"></a>
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<div class="header">
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<p>
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Next: <a href="swprintf.html#swprintf" accesskey="n" rel="next">swprintf</a>, Previous: <a href="sscanf.html#sscanf" accesskey="p" rel="prev">sscanf</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="stdio_005fext_002c_005f_005ffbufsize_002c_005f_005ffpending_002c_005f_005fflbf_002c_005f_005ffreadable_002c_005f_005ffwritable_002c_005f_005ffreading_002c_005f_005ffwriting_002d_002d_002daccess-internals-of-FILE-structure"></a>
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<h3 class="section">4.63 <code>stdio_ext</code>,<code>__fbufsize</code>,<code>__fpending</code>,<code>__flbf</code>,<code>__freadable</code>,<code>__fwritable</code>,<code>__freading</code>,<code>__fwriting</code>—access internals of FILE structure</h3>
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<a name="index-_005f_005ffbufsize"></a>
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<a name="index-_005f_005ffpending"></a>
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<a name="index-_005f_005fflbf"></a>
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<a name="index-_005f_005ffreadable"></a>
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<a name="index-_005f_005ffwritable"></a>
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<a name="index-_005f_005ffreading"></a>
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<a name="index-_005f_005ffwriting"></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 <stdio_ext.h>
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size_t __fbufsize(FILE *<var>fp</var>);
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size_t __fpending(FILE *<var>fp</var>);
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int __flbf(FILE *<var>fp</var>);
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int __freadable(FILE *<var>fp</var>);
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int __fwritable(FILE *<var>fp</var>);
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int __freading(FILE *<var>fp</var>);
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int __fwriting(FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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These functions provides access to the internals of the FILE structure <var>fp</var>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>__fbufsize</code> returns the number of bytes in the buffer of stream <var>fp</var>.
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</p>
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<p><code>__fpending</code> returns the number of bytes in the output buffer of stream <var>fp</var>.
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</p>
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<p><code>__flbf</code> returns nonzero if stream <var>fp</var> is line-buffered, and <code>0</code> if not.
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</p>
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<p><code>__freadable</code> returns nonzero if stream <var>fp</var> may be read, and <code>0</code> if not.
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</p>
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<p><code>__fwritable</code> returns nonzero if stream <var>fp</var> may be written, and <code>0</code> if not.
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</p>
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<p><code>__freading</code> returns nonzero if stream <var>fp</var> if the last operation on
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it was a read, or if it read-only, and <code>0</code> if not.
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</p>
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<p><code>__fwriting</code> returns nonzero if stream <var>fp</var> if the last operation on
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it was a write, or if it write-only, and <code>0</code> if not.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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These functions originate from Solaris and are also provided by GNU libc.
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</p>
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<p>No supporting OS subroutines are required.
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</p>
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<br>
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