VFSCANF(3)                 POSIX Programmer's Manual                VFSCANF(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
       vfscanf, vscanf, vsscanf -- format input of a stdarg argument list

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

       int vfscanf(FILE *restrict _s_t_r_e_a_m, const char *restrict _f_o_r_m_a_t,
           va_list _a_r_g);
       int vscanf(const char *restrict _f_o_r_m_a_t, va_list _a_r_g);
       int vsscanf(const char *restrict _s, const char *restrict _f_o_r_m_a_t,
           va_list _a_r_g);

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.1-2017
       defers to the ISO C standard.

       The _v_s_c_a_n_f(), _v_f_s_c_a_n_f(), and _v_s_s_c_a_n_f() functions shall be equivalent to
       the _s_c_a_n_f(), _f_s_c_a_n_f(), and _s_s_c_a_n_f() functions, respectively, except
       that instead of being called with a variable number of arguments, they
       are called with an argument list as defined in the _<_s_t_d_a_r_g_._h_> header.
       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_s_c_a_n_f().

EERRRROORRSS
       Refer to _f_s_c_a_n_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_s_c_a_n_f()

       The Base Definitions volume of POSIX.1-2017, <<ssttddaarrgg..hh>>, <<ssttddiioo..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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                  2017                           VFSCANF(3)
