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



PROLOG
       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.

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 .



IEEE/The Open Group                  2017                           WCSNCPY(3)
