This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       If  there  is  no null wide-character code in the first n wide-character codes of the array pointed to by
       ws2, the result is not null-terminated.

       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(3POSIX)

       For wcsncpy(): 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 wcpncpy() and wcsncpy() 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 ws2 to the
       array pointed to by ws1.  If copying takes place between objects that overlap, the behavior is undefined.

       If the array pointed to by ws2 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 ws1, until n wide-
       character codes in all are written.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

       wcpncpy, wcsncpy — copy a fixed-size wide-character string, returning a pointer to its end

       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.

       None.

       If any null wide-character codes were written into the destination, the wcpncpy() function  shall  return
       the address of the first such null wide-character code. Otherwise, it shall return &ws1[n].

       The wcsncpy() function shall return ws1.

       No return values are reserved to indicate an error.

strncpy(), wcscpy()

       The Base Definitions volume of POSIX.1‐2017, <wchar.h>

       #include <wchar.h>

       wchar_t *wcpncpy(wchar_t restrict *ws1, const wchar_t *restrict ws2,
           size_t n);
       wchar_t *wcsncpy(wchar_t *restrict ws1, const wchar_t *restrict ws2,
           size_t n);