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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>vfprintf</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_010_398"> </a>NAME</h4><blockquote>vfprintf, vprintf, vsnprintf, vsprintf - format output of astdarg argument list</blockquote><h4><a name = "tag_000_010_399"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdarg.h.html">stdarg.h</a>>#include <<a href="stdio.h.html">stdio.h</a>>int vfprintf(FILE *<i>stream</i>, const char *<i>format</i>, va_list <i>ap</i>);int vprintf(const char *<i>format</i>, va_list <i>ap</i>);int vsnprintf(char *<i>s</i>, size_t <i>n</i>, const char *<i>format</i>, va_list <i>ap</i>);int vsprintf(char *<i>s</i>, const char *<i>format</i>, va_list <i>ap</i>);</code></pre></blockquote><h4><a name = "tag_000_010_400"> </a>DESCRIPTION</h4><blockquote>The<i>vprintf()</i>,<i>vfprintf()</i>,<i>vsnprintf()</i>and<i><a href="vsprintf.html">vsprintf()</a></i>functions are the same as<i><a href="printf.html">printf()</a></i>,<i><a href="fprintf.html">fprintf()</a></i>,<i><a href="snprintf.html">snprintf()</a></i>and<i><a href="sprintf.html">sprintf()</a></i>respectively,except that instead of being called with a variable number ofarguments, they are called with an argument list as defined by<i><a href="stdarg.h.html"><stdarg.h></a></i>.<p>These functions do 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 indeterminate.</blockquote><h4><a name = "tag_000_010_401"> </a>RETURN VALUE</h4><blockquote>Refer to<i><a href="printf.html">printf()</a></i>.</blockquote><h4><a name = "tag_000_010_402"> </a>ERRORS</h4><blockquote>Refer to<i><a href="printf.html">printf()</a></i>.</blockquote><h4><a name = "tag_000_010_403"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_404"> </a>APPLICATION USAGE</h4><blockquote>Applications using these functions should call<i>va_end</i>(<i>ap</i>)afterwards to clean up.</blockquote><h4><a name = "tag_000_010_405"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_406"> </a>SEE ALSO</h4><blockquote><i><a href="printf.html">printf()</a></i>,<i><a href="stdarg.h.html"><stdarg.h></a></i>,<i><a href="stdio.h.html"><stdio.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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