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 (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       vfprintf, vprintf, vsnprintf, vsprintf - format output of a stdarg argument list

SYNOPSIS
       #include <stdarg.h>
       #include <stdio.h>

       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  vprintf(), vfprintf(), vsnprintf(), and vsprintf() functions shall be equivalent to printf(), fprintf(), snprintf(),
       and sprintf() 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 unspecified.

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
       fprintf(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdarg.h>, <stdio.h>

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, Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                  VFPRINTF(3P)