Go forward to wcsncmp
Go backward to wcslen
Go up to Wchar strings
Go to the top op libc

`wcsncat'--concatenate part of two wide-character strings

     #include <wchar.h>
     wchar_t *wcsncat(wchar_t *S1, const wchar_t *S2, size_t N);
The `wcsncat' function appends not more than N wide-character codes (a
null wide-character code and wide-character codes that follow it are
not appended) from the array pointed to by S2 to the end of the
wide-character string pointed to by S1. The initial wide-character code
of S2 overwrites the null wide-character code at the end of S1.  A
terminating null wide-character code is always appended to the result.
If copying takes place between objects that overlap, the behaviour is
The `wcsncat' function returns S1; no return value is reserved to
indicate an error.
`wcsncat' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.