wcpncpy - Man Page

copy a fixed-size string of wide characters, returning a pointer to its end


#include <wchar.h>

wchar_t *wcpncpy(wchar_t *restrict dest, const wchar_t *restrict src,
                 size_t n);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):


    Since glibc 2.10:
        _POSIX_C_SOURCE >= 200809L
    Before glibc 2.10:


The wcpncpy() function is the wide-character equivalent of the stpncpy(3) function. It copies at most n wide characters from the wide-character string pointed to by src, including the terminating null wide (L'\0'), to the array pointed to by dest. Exactly n wide characters are written at dest. If the length wcslen(src) is smaller than n, the remaining wide characters in the array pointed to by dest are filled with L'\0' characters. If the length wcslen(src) is greater than or equal to n, the string pointed to by dest will not be L'\0' terminated.

The strings may not overlap.

The programmer must ensure that there is room for at least n wide characters at dest.

Return Value

wcpncpy() returns a pointer to the last wide character written, that is, dest+n-1.


For an explanation of the terms used in this section, see attributes(7).

wcpncpy()Thread safetyMT-Safe

Conforming to


See Also

stpncpy(3), wcsncpy(3)


This page is part of release 5.13 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Referenced By

signal-safety(7), stpncpy(3).

2021-03-22 GNU Linux Programmer's Manual