libc.info: wcscat

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`wcscat'--concatenate two wide-character strings

*Synopsis*
     #include <wchar.h>
     wchar_t *wcscat(wchar_t *S1, const wchar_t *S2);
   *Description*
The `wcscat' function appends a copy of the wide-character string
pointed to by S2 (including the terminating null wide-character code)
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. If copying takes place between objects that overlap, the
behaviour is undefined.
*Returns*
The `wcscat' function returns S1; no return value is reserved to
indicate an error.
*Portability*
`wcscat' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.