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VFPRINTF(3P)               POSIX Programmer's Manual              VFPRINTF(3P)
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.
NAME
       vdprintf, vfprintf, vprintf, vsnprintf, vsprintf -- format output of  a
       stdarg argument list
SYNOPSIS
       #include <stdarg.h>
       #include <stdio.h>
       int vdprintf(int fildes, const char *restrict format, va_list ap);
       int vfprintf(FILE *restrict stream, const char *restrict format,
           va_list ap);
       int vprintf(const char *restrict format, va_list ap);
       int vsnprintf(char *restrict s, size_t n, const char *restrict format,
           va_list ap);
       int vsprintf(char *restrict s, const char *restrict format, va_list ap);
DESCRIPTION
       The  functionality described on this reference page is aligned with the
       ISO C standard. Any conflict between the  requirements  described  here
       and  the  ISO C  standard is unintentional. This volume of POSIX.1-2008
       defers to the ISO C standard.
       The vdprintf(),  vfprintf(),  vprintf(),  vsnprintf(),  and  vsprintf()
       functions  shall  be equivalent to the  dprintf(), fprintf(), printf(),
       snprintf(), and sprintf() functions respectively, except  that  instead
       of  being  called  with a variable number of arguments, they are called
       with an argument list as defined by <stdarg.h>.
       These functions shall not invoke the va_end macro. As  these  functions
       invoke  the  va_arg macro, the value of ap after the return is unspeci-
       fied.
RETURN VALUE
       Refer to fprintf().
ERRORS
       Refer to fprintf().
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       Applications using these functions should call va_end(ap) afterwards to
       clean up.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       Section 2.5, Standard I/O Streams, fprintf()
       The Base Definitions volume of POSIX.1-2008, <stdarg.h>, <stdio.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         VFPRINTF(3P)