WCSNCAT(3) Linux Programmer's Manual WCSNCAT(3)

wcsncat - concatenate two wide-character strings

#include <wchar.h>
wchar_t *wcsncat(wchar_t *dest, const wchar_t *src, size_t n);

The wcsncat() function is the wide-character equivalent of the strncat(3) function. It copies at most n wide characters from the wide-character string pointed to by src to the end of the wide-character string pointed to by dest, and adds a terminating null wide character (L'\0').
The strings may not overlap.
The programmer must ensure that there is room for at least wcslen(dest)+n+1 wide characters at dest.

wcsncat() returns dest.

For an explanation of the terms used in this section, see attributes(7).
Interface Attribute Value
wcsncat () Thread safety MT-Safe

POSIX.1-2001, POSIX.1-2008, C99.

strncat(3), wcscat(3)
2019-03-06 GNU