.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
.TH "VFPRINTF" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\" vfprintf 
.SH PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
.SH NAME
vfprintf, vprintf, vsnprintf, vsprintf \- format output of a stdarg
argument list
.SH SYNOPSIS
.LP
\fB#include <stdarg.h>
.br
#include <stdio.h>
.br
.sp
int vfprintf(FILE *restrict\fP \fIstream\fP\fB, const char *restrict\fP
\fIformat\fP\fB,
.br
\ \ \ \ \ \  va_list\fP \fIap\fP\fB);
.br
int vprintf(const char *restrict\fP \fIformat\fP\fB, va_list\fP \fIap\fP\fB);
.br
int vsnprintf(char *restrict\fP \fIs\fP\fB, size_t\fP \fIn\fP\fB,
const char *restrict\fP \fIformat\fP\fB,
.br
\ \ \ \ \ \  va_list\fP \fIap\fP\fB);
.br
int vsprintf(char *restrict\fP \fIs\fP\fB, const char *restrict\fP
\fIformat\fP\fB, va_list\fP \fIap\fP\fB);
.br
\fP
.SH DESCRIPTION
.LP
The \fIvprintf\fP(), \fIvfprintf\fP(), \fIvsnprintf\fP(), and \fIvsprintf\fP()
functions shall be equivalent to \fIprintf\fP(), \fIfprintf\fP(),
\fIsnprintf\fP(), and \fIsprintf\fP() respectively,
except that instead of being called with a variable number of arguments,
they are called with an argument list as defined by \fI<stdarg.h>\fP.
.LP
These functions shall not invoke the \fIva_end\fP macro. As these
functions invoke the \fIva_arg\fP macro, the value of
\fIap\fP after the return is unspecified.
.SH RETURN VALUE
.LP
Refer to \fIfprintf\fP().
.SH ERRORS
.LP
Refer to \fIfprintf\fP().
.LP
\fIThe following sections are informative.\fP
.SH EXAMPLES
.LP
None.
.SH APPLICATION USAGE
.LP
Applications using these functions should call \fIva_end\fP(\fIap\fP)
afterwards to clean up.
.SH RATIONALE
.LP
None.
.SH FUTURE DIRECTIONS
.LP
None.
.SH SEE ALSO
.LP
\fIfprintf\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
\fI<stdarg.h>\fP, \fI<stdio.h>\fP
.SH COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .