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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>vfprintf</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="vfprintf"></a> <a name="tag_03_810"></a><!-- vfprintf --> <!--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_810_01"></a>NAME</h4><blockquote>vfprintf, vprintf, vsnprintf, vsprintf - format output of a stdarg argument list</blockquote><h4><a name="tag_03_810_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 vfprintf(FILE *restrict</tt> <i>stream</i><tt>, const char *restrict</tt> <i>format</i><tt>,<br> va_list</tt> <i>ap</i><tt>);<br> int vprintf(const char *restrict</tt> <i>format</i><tt>, va_list</tt> <i>ap</i><tt>);<br> int vsnprintf(char *restrict</tt> <i>s</i><tt>, size_t</tt> <i>n</i><tt>, const char *restrict</tt> <i>format</i><tt>,<br> va_list</tt> <i>ap</i><tt>);<br> int vsprintf(char *restrict</tt> <i>s</i><tt>, const char *restrict</tt> <i>format</i><tt>, va_list</tt> <i>ap</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_810_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>vprintf</i>(), <i>vfprintf</i>(), <i>vsnprintf</i>(), and <i>vsprintf</i>() functions shall be equivalent to <a href="../functions/printf.html"><i>printf</i>()</a>, <a href="../functions/fprintf.html"><i>fprintf</i>()</a>, <a href="../functions/snprintf.html"><i>snprintf</i>()</a>, and <a href="../functions/sprintf.html"><i>sprintf</i>()</a> respectively,except that instead of being called with a variable number of arguments, they are called with an argument list as defined by <ahref="../basedefs/stdarg.h.html"><i><stdarg.h></i></a>.</p><p>These functions shall not invoke the <i>va_end</i> macro. As these functions 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_810_04"></a>RETURN VALUE</h4><blockquote><p>Refer to <a href="fprintf.html"><i>fprintf</i>()</a> .</p></blockquote><h4><a name="tag_03_810_05"></a>ERRORS</h4><blockquote><p>Refer to <a href="fprintf.html"><i>fprintf</i>()</a> .</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_810_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_810_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_810_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_810_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_810_10"></a>SEE ALSO</h4><blockquote><p><a href="fprintf.html"><i>fprintf</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_810_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_810_12"></a>Issue 5</h4><blockquote><p>The <i>vsnprintf</i>() function is added.</p></blockquote><h4><a name="tag_03_810_13"></a>Issue 6</h4><blockquote><p>The <i>vfprintf</i>(), <i>vprintf</i>(), <i>vsnprintf</i>(), and <i>vsprintf</i>() functions are updated for alignment with theISO/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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