PROLOG

       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

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

SYNOPSIS

       #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);

DESCRIPTION

       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.

RETURN VALUE

       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.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       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.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       strncpy(), wcscpy()

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

COPYRIGHT

       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 .