wcsnlen - determine the length of a fixed-size wide-character string
size_t wcsnlen (const wchar_t *s, size_t maxlen);
The wcsnlen function is the wide-character equivalent of the strnlen
function. It returns the number of wide-characters in the string
pointed to by s, not including the terminating L'\0' character, but at
most maxlen. In doing this, wcsnlen looks only at the first maxlen
wide-characters at s and never beyond s+maxlen.
The wcsnlen function returns wcslen(s), if that is less than maxlen, or
maxlen if there is no L'\0' character among the first maxlen wide characters
pointed to by s.
This function is a GNU extension.
GNU 1999-07-25 WCSNLEN(3)
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