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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
       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() respec-
       tively, 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
       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,  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 .

IEEE/The Open Group                  2003                         VFPRINTF(3P)