124 lines
4.7 KiB
HTML
124 lines
4.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>vfscanf</title>
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="vfscanf"></a> <a name="tag_03_811"></a><!-- vfscanf -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_811_01"></a>NAME</h4>
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<blockquote>vfscanf, vscanf, vsscanf - format input of a stdarg argument list</blockquote>
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<h4><a name="tag_03_811_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/stdarg.h.html">stdarg.h</a>><br>
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#include <<a href="../basedefs/stdio.h.html">stdio.h</a>><br>
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<br>
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int vfscanf(FILE *restrict</tt> <i>stream</i><tt>, const char *restrict</tt> <i>format</i><tt>,<br>
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va_list</tt> <i>arg</i><tt>);<br>
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int vscanf(const char *restrict</tt> <i>format</i><tt>, va_list</tt> <i>arg</i><tt>);<br>
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int vsscanf(const char *restrict</tt> <i>s</i><tt>, const char *restrict</tt> <i>format</i><tt>,<br>
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va_list</tt> <i>arg</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_811_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i>vscanf</i>(), <i>vfscanf</i>(), and <i>vsscanf</i>() functions shall be equivalent to the <a href=
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"../functions/scanf.html"><i>scanf</i>()</a>, <a href="../functions/fscanf.html"><i>fscanf</i>()</a>, and <a href=
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"../functions/sscanf.html"><i>sscanf</i>()</a> functions, respectively, except that instead of being called with a variable number
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of arguments, they are called with an argument list as defined in the <a href=
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"../basedefs/stdarg.h.html"><i><stdarg.h></i></a> header. These functions shall not invoke the <i>va_end</i> macro. As these
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functions invoke the <i>va_arg</i> macro, the value of <i>ap</i> after the return is unspecified.</p>
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</blockquote>
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<h4><a name="tag_03_811_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Refer to <a href="fscanf.html"><i>fscanf</i>()</a> .</p>
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</blockquote>
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<h4><a name="tag_03_811_05"></a>ERRORS</h4>
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<blockquote>
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<p>Refer to <a href="fscanf.html"><i>fscanf</i>()</a> .</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_811_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_811_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>Applications using these functions should call <i>va_end</i>( <i>ap</i>) afterwards to clean up.</p>
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</blockquote>
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<h4><a name="tag_03_811_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_811_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_811_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="fscanf.html"><i>fscanf</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/stdarg.h.html"><i><stdarg.h></i></a>, <a href="../basedefs/stdio.h.html"><i><stdio.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_811_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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