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<title>ALSA project - the C library reference: Input Interface</title>
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<h1>Input Interface</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct _snd_input </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Internal structure for an input object. <a href="#ga39165553a2907c5a27f325e3ce4e8301"></a><br/></td></tr>
<tr><td colspan="2"><h2>Enumerations</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#ga95856616f8604ef37e7f5e6738ffad8a">snd_input_type_t</a> { <a class="el" href="group___input.html#gga95856616f8604ef37e7f5e6738ffad8aa2d48649c7cb19e419a82b2c4bab68515">SND_INPUT_STDIO</a>,
<a class="el" href="group___input.html#gga95856616f8604ef37e7f5e6738ffad8aa0d269e19ac019b61ec5e3afa4a1d9b67">SND_INPUT_BUFFER</a>
}</td></tr>
<tr><td colspan="2"><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#ga68ff91aaa391b39f5a3082e202fdd2ff">snd_input_stdio_open</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> **inputp, const char *file, const char *mode)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a new input object reading from a file. <a href="#ga68ff91aaa391b39f5a3082e202fdd2ff"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#ga70e6704164f80072bfa118160ff81d54">snd_input_stdio_attach</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> **inputp, FILE *fp, int _close)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a new input object using an existing stdio <code>FILE</code> pointer. <a href="#ga70e6704164f80072bfa118160ff81d54"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#ga3c7947884b1caf50117bcecd23a3cc22">snd_input_buffer_open</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> **inputp, const char *buffer, ssize_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a new input object from a memory buffer. <a href="#ga3c7947884b1caf50117bcecd23a3cc22"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#ga4c86d6c288e2b1be3fe2efca6859cdd6">snd_input_close</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> *input)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Closes an input handle. <a href="#ga4c86d6c288e2b1be3fe2efca6859cdd6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#ga079ba3d8ad9cfba4003c28520c2f8121">snd_input_scanf</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> *input, const char *format,...)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reads formatted input (like <code>fscanf(3)</code>) from an input handle. <a href="#ga079ba3d8ad9cfba4003c28520c2f8121"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#gabc17742247f4733f1891c2caec453988">snd_input_gets</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> *input, char *str, size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reads a line from an input handle (like <code>fgets(3)</code>). <a href="#gabc17742247f4733f1891c2caec453988"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#gafb9476884661a2d685e59e58740cc9e6">snd_input_getc</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> *input)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reads a character from an input handle (like <code>fgetc(3)</code>). <a href="#gafb9476884661a2d685e59e58740cc9e6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___input.html#gad665d319d2d0a4127110c141ef99a02b">snd_input_ungetc</a> (<a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> *input, int c)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Puts the last character read back to an input handle (like <code>ungetc(3)</code>). <a href="#gad665d319d2d0a4127110c141ef99a02b"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>The input functions present an interface similar to the stdio functions on top of different underlying input sources.</p>
<p>The <a class="el" href="group___config.html#ga51f79d1f24a519e126415c72210525b0" title="Loads a configuration tree.">snd_config_load</a> function uses such an input handle to be able to load configurations not only from standard files but also from other sources, e.g. from memory buffers. </p>
<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="ga39165553a2907c5a27f325e3ce4e8301"></a><!-- doxytag: member="input.h::snd_input_t" ref="ga39165553a2907c5a27f325e3ce4e8301" args="" -->
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<td class="memname">typedef struct _snd_input <a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a></td>
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<p>Internal structure for an input object. </p>
<p>The ALSA library uses a pointer to this structure as a handle to an input object. Applications don't access its contents directly. </p>
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<hr/><h2>Enumeration Type Documentation</h2>
<a class="anchor" id="ga95856616f8604ef37e7f5e6738ffad8a"></a><!-- doxytag: member="input.h::snd_input_type_t" ref="ga95856616f8604ef37e7f5e6738ffad8a" args="" -->
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<td class="memname">enum <a class="el" href="group___input.html#ga95856616f8604ef37e7f5e6738ffad8a">snd_input_type_t</a></td>
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<p>Input type. </p>
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="gga95856616f8604ef37e7f5e6738ffad8aa2d48649c7cb19e419a82b2c4bab68515"></a><!-- doxytag: member="SND_INPUT_STDIO" ref="gga95856616f8604ef37e7f5e6738ffad8aa2d48649c7cb19e419a82b2c4bab68515" args="" -->SND_INPUT_STDIO</em> </td><td>
<p>Input from a stdio stream. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga95856616f8604ef37e7f5e6738ffad8aa0d269e19ac019b61ec5e3afa4a1d9b67"></a><!-- doxytag: member="SND_INPUT_BUFFER" ref="gga95856616f8604ef37e7f5e6738ffad8aa0d269e19ac019b61ec5e3afa4a1d9b67" args="" -->SND_INPUT_BUFFER</em> </td><td>
<p>Input from a memory buffer. </p>
</td></tr>
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</dd>
</dl>
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<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga3c7947884b1caf50117bcecd23a3cc22"></a><!-- doxytag: member="input.h::snd_input_buffer_open" ref="ga3c7947884b1caf50117bcecd23a3cc22" args="(snd_input_t **inputp, const char *buffer, ssize_t size)" -->
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<td class="memname">int snd_input_buffer_open </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> ** </td>
<td class="paramname"> <em>inputp</em>, </td>
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<td class="paramtype">const char * </td>
<td class="paramname"> <em>buf</em>, </td>
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<td class="paramtype">ssize_t </td>
<td class="paramname"> <em>size</em></td><td> </td>
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<p>Creates a new input object from a memory buffer. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>inputp</em> </td><td>The function puts the pointer to the new input object at the address specified by <code>inputp</code>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>buf</em> </td><td>Address of the input buffer. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>size</em> </td><td>Size of the input buffer. </td></tr>
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</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Zero if successful, otherwise a negative error code.</dd></dl>
<p>This functions creates a copy of the input buffer, so the application is not required to preserve the buffer after this function has been called. </p>
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<a class="anchor" id="ga4c86d6c288e2b1be3fe2efca6859cdd6"></a><!-- doxytag: member="input.h::snd_input_close" ref="ga4c86d6c288e2b1be3fe2efca6859cdd6" args="(snd_input_t *input)" -->
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<td class="memname">int snd_input_close </td>
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<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> * </td>
<td class="paramname"> <em>input</em></td>
<td> ) </td>
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<p>Closes an input handle. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>input</em> </td><td>The input handle to be closed. </td></tr>
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</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Zero if successful, otherwise a negative error code. </dd></dl>
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<a class="anchor" id="gafb9476884661a2d685e59e58740cc9e6"></a><!-- doxytag: member="input.h::snd_input_getc" ref="gafb9476884661a2d685e59e58740cc9e6" args="(snd_input_t *input)" -->
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<td class="memname">int snd_input_getc </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> * </td>
<td class="paramname"> <em>input</em></td>
<td> ) </td>
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<p>Reads a character from an input handle (like <code>fgetc(3)</code>). </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>input</em> </td><td>The input handle. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The character read, or <code>EOF</code> on end of file or error. </dd></dl>
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<a class="anchor" id="gabc17742247f4733f1891c2caec453988"></a><!-- doxytag: member="input.h::snd_input_gets" ref="gabc17742247f4733f1891c2caec453988" args="(snd_input_t *input, char *str, size_t size)" -->
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<td class="memname">char* snd_input_gets </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> * </td>
<td class="paramname"> <em>input</em>, </td>
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<td></td>
<td class="paramtype">char * </td>
<td class="paramname"> <em>str</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"> <em>size</em></td><td> </td>
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<td></td>
<td>)</td>
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<p>Reads a line from an input handle (like <code>fgets(3)</code>). </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>input</em> </td><td>The input handle. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>str</em> </td><td>Address of the destination buffer. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>size</em> </td><td>The size of the destination buffer. </td></tr>
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</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Pointer to the buffer if successful, otherwise <code>NULL</code>.</dd></dl>
<p>Like <code>fgets</code>, the returned string is zero-terminated, and contains the new-line character <code>'\n'</code> if the line fits into the buffer. </p>
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<a class="anchor" id="ga079ba3d8ad9cfba4003c28520c2f8121"></a><!-- doxytag: member="input.h::snd_input_scanf" ref="ga079ba3d8ad9cfba4003c28520c2f8121" args="(snd_input_t *input, const char *format,...)" -->
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<td class="memname">int snd_input_scanf </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> * </td>
<td class="paramname"> <em>input</em>, </td>
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<td class="paramname"> <em>format</em>, </td>
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<td class="paramname"> <em>...</em></td><td> </td>
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<p>Reads formatted input (like <code>fscanf(3)</code>) from an input handle. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>input</em> </td><td>The input handle. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>format</em> </td><td>Format string in <code>fscanf</code> format. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>...</em> </td><td>Other <code>fscanf</code> arguments. </td></tr>
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</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>The number of input items assigned, or <code>EOF</code>.</dd></dl>
<dl class="bug"><dt><b><a class="el" href="bug.html#_bug000001">Bug:</a></b></dt><dd>Reading from a memory buffer doesn't work. </dd></dl>
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<a class="anchor" id="ga70e6704164f80072bfa118160ff81d54"></a><!-- doxytag: member="input.h::snd_input_stdio_attach" ref="ga70e6704164f80072bfa118160ff81d54" args="(snd_input_t **inputp, FILE *fp, int _close)" -->
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<td class="memname">int snd_input_stdio_attach </td>
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<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> ** </td>
<td class="paramname"> <em>inputp</em>, </td>
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<td class="paramtype">FILE * </td>
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<td class="paramtype">int </td>
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<p>Creates a new input object using an existing stdio <code>FILE</code> pointer. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>inputp</em> </td><td>The function puts the pointer to the new input object at the address specified by <code>inputp</code>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>fp</em> </td><td>The <code>FILE</code> pointer to read from. Reading begins at the current file position. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>_close</em> </td><td>Close flag. Set this to 1 if <a class="el" href="group___input.html#ga4c86d6c288e2b1be3fe2efca6859cdd6" title="Closes an input handle.">snd_input_close</a> should close <code>fp</code> by calling <code>fclose</code>. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Zero if successful, otherwise a negative error code. </dd></dl>
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<a class="anchor" id="ga68ff91aaa391b39f5a3082e202fdd2ff"></a><!-- doxytag: member="input.h::snd_input_stdio_open" ref="ga68ff91aaa391b39f5a3082e202fdd2ff" args="(snd_input_t **inputp, const char *file, const char *mode)" -->
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<td class="memname">int snd_input_stdio_open </td>
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<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> ** </td>
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<td class="paramname"> <em>file</em>, </td>
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<td class="paramtype">const char * </td>
<td class="paramname"> <em>mode</em></td><td> </td>
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<p>Creates a new input object reading from a file. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>inputp</em> </td><td>The functions puts the pointer to the new input object at the address specified by <code>inputp</code>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>The name of the file to read from. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>mode</em> </td><td>The open mode, like <code>fopen(3)</code>. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Zero if successful, otherwise a negative error code. </dd></dl>
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<a class="anchor" id="gad665d319d2d0a4127110c141ef99a02b"></a><!-- doxytag: member="input.h::snd_input_ungetc" ref="gad665d319d2d0a4127110c141ef99a02b" args="(snd_input_t *input, int c)" -->
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<td class="memname">int snd_input_ungetc </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___input.html#ga39165553a2907c5a27f325e3ce4e8301">snd_input_t</a> * </td>
<td class="paramname"> <em>input</em>, </td>
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<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>c</em></td><td> </td>
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<p>Puts the last character read back to an input handle (like <code>ungetc(3)</code>). </p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>input</em> </td><td>The input handle. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>c</em> </td><td>The character to push back. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>The character pushed back, or <code>EOF</code> on error. </dd></dl>
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