1<html lang="en"> 2<head> 3<title>vfprintf - 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="Stdio.html#Stdio" title="Stdio"> 9<link rel="prev" href="ungetwc.html#ungetwc" title="ungetwc"> 10<link rel="next" href="vfscanf.html#vfscanf" title="vfscanf"> 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="vfprintf"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="vfscanf.html#vfscanf">vfscanf</a>, 31Previous: <a rel="previous" accesskey="p" href="ungetwc.html#ungetwc">ungetwc</a>, 32Up: <a rel="up" accesskey="u" href="Stdio.html#Stdio">Stdio</a> 33<hr> 34</div> 35 36<h3 class="section">4.68 <code>vfprintf</code>, <code>vprintf</code>, <code>vsprintf</code>, <code>vsnprintf</code>, <code>vasprintf</code>, <code>vasnprintf</code>—format argument list</h3> 37 38<p><a name="index-vfprintf-325"></a><a name="index-g_t_005fvfprintf_005fr-326"></a><a name="index-vprintf-327"></a><a name="index-g_t_005fvprintf_005fr-328"></a><a name="index-vsprintf-329"></a><a name="index-g_t_005fvsprintf_005fr-330"></a><a name="index-vsnprintf-331"></a><a name="index-g_t_005fvsnprintf_005fr-332"></a><a name="index-vasprintf-333"></a><a name="index-g_t_005fvasprintf_005fr-334"></a><a name="index-vasnprintf-335"></a><a name="index-g_t_005fvasnprintf_005fr-336"></a><strong>Synopsis</strong> 39<pre class="example"> #include <stdio.h> 40 #include <stdarg.h> 41 int vprintf(const char *<var>fmt</var>, va_list <var>list</var>); 42 int vfprintf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>); 43 int vsprintf(char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>); 44 int vsnprintf(char *<var>str</var>, size_t <var>size</var>, const char *<var>fmt</var>, 45 va_list <var>list</var>); 46 int vasprintf(char **<var>strp</var>, const char *<var>fmt</var>, va_list <var>list</var>); 47 char *vasnprintf(char *<var>str</var>, size_t *<var>size</var>, const char *<var>fmt</var>, 48 va_list <var>list</var>); 49 50 int _vprintf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>, 51 va_list <var>list</var>); 52 int _vfprintf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>, 53 const char *<var>fmt</var>, va_list <var>list</var>); 54 int _vsprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>, 55 const char *<var>fmt</var>, va_list <var>list</var>); 56 int _vasprintf_r(struct _reent *<var>reent</var>, char **<var>str</var>, 57 const char *<var>fmt</var>, va_list <var>list</var>); 58 int _vsnprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>, 59 size_t <var>size</var>, const char *<var>fmt</var>, va_list <var>list</var>); 60 char *_vasnprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>, 61 size_t *<var>size</var>, const char *<var>fmt</var>, va_list <var>list</var>); 62 63</pre> 64 <p><strong>Description</strong><br> 65<code>vprintf</code>, <code>vfprintf</code>, <code>vasprintf</code>, <code>vsprintf</code>, <code>vsnprintf</code>, 66and <code>vasnprintf</code> are (respectively) variants of <code>printf</code>, 67<code>fprintf</code>, <code>asprintf</code>, <code>sprintf</code>, <code>snprintf</code>, and 68<code>asnprintf</code>. They differ only in allowing their caller to pass the 69variable argument list as a <code>va_list</code> object (initialized by 70<code>va_start</code>) rather than directly accepting a variable number of 71arguments. The caller is responsible for calling <code>va_end</code>. 72 73 <p><code>_vprintf_r</code>, <code>_vfprintf_r</code>, <code>_vasprintf_r</code>, <code>_vsprintf_r</code>, 74<code>_vsnprintf_r</code>, and <code>_vasnprintf_r</code> are reentrant versions of the 75above. 76 77 <p><br> 78<strong>Returns</strong><br> 79The return values are consistent with the corresponding functions. 80 81 <p><br> 82<strong>Portability</strong><br> 83ANSI C requires <code>vprintf</code>, <code>vfprintf</code>, <code>vsprintf</code>, and 84<code>vsnprintf</code>. The remaining functions are newlib extensions. 85 86 <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>, 87<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>. 88 89 <p><br> 90 91 </body></html> 92 93