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wchar_t *wcscat(wchar_t *dest, const wchar_t *src);
The wcscat() function is the wide-character equivalent of the strcat(3)
function. It copies the wide-character string pointed to by src,
including the terminating null wide character (L'\0'), to the end of
the wide-character string pointed to by dest.
The strings may not overlap.
The programmer must ensure that there is room for at least
wcslen(dest)+wcslen(src)+1 wide characters at dest.
wcscat() returns dest.
Multithreading (see pthreads(7))
The wcscat() function is thread-safe.
strcat(3), wcpcpy(3), wcscpy(3), wcsncat(3)
GNU 2013-12-02 WCSCAT(3)