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6.21 wcsnlen—get fixed-size wide-character string length

Synopsis 

     #include <wchar.h>
     size_t wcsnlen(const wchar_t *s, size_t maxlen);

Description
The wcsnlen function computes the number of wide-character codes in the wide-character string pointed to by s not including the terminating L'\0' wide character but at most maxlen wide characters.
Returns
wcsnlen returns the length of s if it is less then maxlen, or maxlen if there is no L'\0' wide character in first maxlen characters.
Portability
wcsnlen is a GNU extension.

wcsnlen requires no supporting OS subroutines.