WCSLEN

wcslen − determine the length of a wide-character string

#include <wchar.h>

size_t wcslen (const wchar_t *s);

The wcslen function is the wide-character equivalent of the strlen function. It determines the length of the wide-character string pointed to by s, not including the terminating L’\0’ character.

The wcslen function returns the number of wide characters in s.

ISO/ANSI C, UNIX98

strlen(3)