PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

VFPRINTF(3P)              POSIX Programmer's Manual             VFPRINTF(3P)

PROLOG         top

       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         top

       vdprintf, vfprintf, vprintf, vsnprintf, vsprintf — format output of a
       stdarg argument list

SYNOPSIS         top

       #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         top

       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
       unspecified.

RETURN VALUE         top

       Refer to fprintf(3p).

ERRORS         top

       Refer to fprintf(3p).

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       Applications using these functions should call va_end(ap) afterwards
       to clean up.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       Section 2.5, Standard I/O Streams, fprintf(3p)

       The Base Definitions volume of POSIX.1‐2008, stdarg.h(0p),
       stdio.h(0p)

COPYRIGHT         top

       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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                        VFPRINTF(3P)