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size_t wcsnlen(const wchar_t *s, size_t maxlen);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
The wcsnlen() function is the wide-character equivalent of the
strnlen(3) function. It returns the number of wide-characters in the
string pointed to by s, not including the terminating null wide charac-
ter (L'\0'), but at most maxlen wide characters (note: this parameter
is not a byte count). In doing this, wcsnlen() looks at only 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 null wide character among the first maxlen
wide characters pointed to by s.
The wcsnlen() function is provided in glibc since version 2.1.
Multithreading (see pthreads(7))
The wcsnlen() function is thread-safe.
GNU 2013-11-25 WCSNLEN(3)