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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(3) function. It determines the length of the wide-character string pointed to by s, excluding the terminating null wide chharacter (L'\0').
The wcslen() function returns the number of wide characters in s.
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