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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>vfscanf</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="vfscanf"></a> <a name="tag_03_811"></a><!-- vfscanf --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_811_01"></a>NAME</h4><blockquote>vfscanf, vscanf, vsscanf - format input of a stdarg argument list</blockquote><h4><a name="tag_03_811_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/stdarg.h.html">stdarg.h</a>><br> #include <<a href="../basedefs/stdio.h.html">stdio.h</a>><br><br> int vfscanf(FILE *restrict</tt> <i>stream</i><tt>, const char *restrict</tt> <i>format</i><tt>,<br> va_list</tt> <i>arg</i><tt>);<br> int vscanf(const char *restrict</tt> <i>format</i><tt>, va_list</tt> <i>arg</i><tt>);<br> int vsscanf(const char *restrict</tt> <i>s</i><tt>, const char *restrict</tt> <i>format</i><tt>,<br> va_list</tt> <i>arg</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_811_03"></a>DESCRIPTION</h4><blockquote><div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between therequirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers tothe ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>The <i>vscanf</i>(), <i>vfscanf</i>(), and <i>vsscanf</i>() functions shall be equivalent to the <a href="../functions/scanf.html"><i>scanf</i>()</a>, <a href="../functions/fscanf.html"><i>fscanf</i>()</a>, and <a href="../functions/sscanf.html"><i>sscanf</i>()</a> functions, respectively, except that instead of being called with a variable numberof arguments, they are called with an argument list as defined in the <a href="../basedefs/stdarg.h.html"><i><stdarg.h></i></a> header. These functions shall not invoke the <i>va_end</i> macro. As thesefunctions invoke the <i>va_arg</i> macro, the value of <i>ap</i> after the return is unspecified.</p></blockquote><h4><a name="tag_03_811_04"></a>RETURN VALUE</h4><blockquote><p>Refer to <a href="fscanf.html"><i>fscanf</i>()</a> .</p></blockquote><h4><a name="tag_03_811_05"></a>ERRORS</h4><blockquote><p>Refer to <a href="fscanf.html"><i>fscanf</i>()</a> .</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_811_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_811_07"></a>APPLICATION USAGE</h4><blockquote><p>Applications using these functions should call <i>va_end</i>( <i>ap</i>) afterwards to clean up.</p></blockquote><h4><a name="tag_03_811_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_811_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_811_10"></a>SEE ALSO</h4><blockquote><p><a href="fscanf.html"><i>fscanf</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/stdarg.h.html"><i><stdarg.h></i></a>, <a href="../basedefs/stdio.h.html"><i><stdio.h></i></a></p></blockquote><h4><a name="tag_03_811_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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