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



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.


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

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

       int vdprintf(int _f_i_l_d_e_s, const char *restrict _f_o_r_m_a_t, va_list _a_p);
       int vfprintf(FILE *restrict _s_t_r_e_a_m, const char *restrict _f_o_r_m_a_t,
           va_list _a_p);
       int vprintf(const char *restrict _f_o_r_m_a_t, va_list _a_p);
       int vsnprintf(char *restrict _s, size_t _n, const char *restrict _f_o_r_m_a_t,
           va_list _a_p);
       int vsprintf(char *restrict _s, const char *restrict _f_o_r_m_a_t, va_list _a_p);

DDEESSCCRRIIPPTTIIOONN
       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 _v_d_p_r_i_n_t_f(), _v_f_p_r_i_n_t_f(), _v_p_r_i_n_t_f(), _v_s_n_p_r_i_n_t_f(), and _v_s_p_r_i_n_t_f()
       functions shall be equivalent to the  _d_p_r_i_n_t_f(), _f_p_r_i_n_t_f(), _p_r_i_n_t_f(),
       _s_n_p_r_i_n_t_f(), and _s_p_r_i_n_t_f() functions respectively, except that instead
       of being called with a variable number of arguments, they are called
       with an argument list as defined by _<_s_t_d_a_r_g_._h_>.

       These functions shall not invoke the _v_a___e_n_d macro. As these functions
       invoke the _v_a___a_r_g macro, the value of _a_p after the return is
       unspecified.

RREETTUURRNN VVAALLUUEE
       Refer to _f_p_r_i_n_t_f().

EERRRROORRSS
       Refer to _f_p_r_i_n_t_f().

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       Applications using these functions should call _v_a___e_n_d(_a_p) afterwards to
       clean up.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _S_e_c_t_i_o_n _2_._5, _S_t_a_n_d_a_r_d _I_/_O _S_t_r_e_a_m_s, _f_p_r_i_n_t_f()

       The Base Definitions volume of POSIX.1-2008, <<ssttddaarrgg..hh>>, <<ssttddiioo..hh>>

CCOOPPYYRRIIGGHHTT
       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(3)
