WCSNCPY(3)                 POSIX Programmer's Manual                WCSNCPY(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
       wcpncpy, wcsncpy -- copy a fixed-size wide-character string, returning
       a pointer to its end

SSYYNNOOPPSSIISS
       #include <wchar.h>

       wchar_t *wcpncpy(wchar_t restrict *_w_s_1, const wchar_t *restrict _w_s_2,
           size_t _n);
       wchar_t *wcsncpy(wchar_t *restrict _w_s_1, const wchar_t *restrict _w_s_2,
           size_t _n);

DDEESSCCRRIIPPTTIIOONN
       For _w_c_s_n_c_p_y(): 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 _w_c_p_n_c_p_y() and _w_c_s_n_c_p_y() functions shall copy not more than _n wide-
       character codes (wide-character codes that follow a null wide-character
       code are not copied) from the array pointed to by _w_s_2 to the array
       pointed to by _w_s_1.  If copying takes place between objects that
       overlap, the behavior is undefined.

       If the array pointed to by _w_s_2 is a wide-character string that is
       shorter than _n wide-character codes, null wide-character codes shall be
       appended to the copy in the array pointed to by _w_s_1, until _n wide-
       character codes in all are written.

RREETTUURRNN VVAALLUUEE
       If any null wide-character codes were written into the destination, the
       _w_c_p_n_c_p_y() function shall return the address of the first such null
       wide-character code. Otherwise, it shall return _&_w_s_1[_n].

       The _w_c_s_n_c_p_y() function shall return _w_s_1.

       No return values are reserved to indicate an error.

EERRRROORRSS
       No errors are defined.

       _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
       If there is no null wide-character code in the first _n wide-character
       codes of the array pointed to by _w_s_2, the result is not null-
       terminated.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _s_t_r_n_c_p_y(), _w_c_s_c_p_y()

       The Base Definitions volume of POSIX.1-2017, <<wwcchhaarr..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                           WCSNCPY(3)
