wcsnlen - determine the length of a fixed-size wide-character string
size_t wcsnlen(const wchar_t *s, size_t maxlen);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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
character (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
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.
For an explanation of the terms used in this section, see attributes(7).
- Since glibc 2.10:
- _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
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