libc.info: wcslcat

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`wcslcat'--concatenate wide-character strings to specified length

*Synopsis*
     #include <wchar.h>
     size_t wcslcat(wchar_t *DST, const wchar_t *SRC, size_t SIZ);
   *Description*
The `wcslcat' function appends wide-characters from SRC to end of the
DST wide-character string so that the resultant wide-character string
is not more than SIZ wide-characters including terminating null
wide-character code.  A terminating null wide-character is always added
unless SIZ is 0.  Thus, the maximum number of wide-characters that can
be appended from SRC is SIZ - 1. If copying takes place between objects
that overlap, the behaviour is undefined.
*Returns*
Wide-character string length of initial DST plus the wide-character
string length of SRC (does not include terminating null
wide-characters).  If the return value is greater than or equal to SIZ,
then truncation occurred and not all wide-characters from SRC were
appended.
*Portability*
No supporting OS subroutines are required.