1<html lang="en"> 2<head> 3<title>va_start-trad - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Varargs.html#Varargs" title="Varargs"> 9<link rel="prev" href="va_005falist.html#va_005falist" title="va_alist"> 10<link rel="next" href="va_005farg_002dtrad.html#va_005farg_002dtrad" title="va_arg-trad"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="va_start-trad"></a> 29<a name="va_005fstart_002dtrad"></a> 30<p> 31Next: <a rel="next" accesskey="n" href="va_005farg_002dtrad.html#va_005farg_002dtrad">va_arg-trad</a>, 32Previous: <a rel="previous" accesskey="p" href="va_005falist.html#va_005falist">va_alist</a>, 33Up: <a rel="up" accesskey="u" href="Varargs.html#Varargs">Varargs</a> 34<hr> 35</div> 36 37<h4 class="subsection">13.2.2 Initialize variable argument list</h4> 38 39<p><a name="index-va_005fstart-502"></a><strong>Synopsis</strong> 40<pre class="example"> #include <varargs.h> 41 va_list <var>ap</var>; 42 va_start(<var>ap</var>); 43</pre> 44 <p><strong>Description</strong><br> 45With the <samp><span class="file">varargs.h</span></samp> macros, use <code>va_start</code> to initialize a 46data structure <var>ap</var> to permit manipulating a variable argument list. 47<var>ap</var> must have the type <var>va_alist</var>. 48 49 <p><strong>Returns</strong><br> 50<code>va_start</code> does not return a result. 51 52 <p><strong>Portability</strong><br> 53<code>va_start</code> is also defined as a macro in ANSI C, but the 54definitions are incompatible; the ANSI version has another parameter 55besides <var>ap</var>. 56 57 </body></html> 58 59