wcscmp

wcscmp is a C standard library function found in the <cwchar> header file. It is used to compare two wide character strings. The function takes two arguments, `s1` and `s2`, which are pointers to null-terminated wide character strings. It returns an integer value indicating the lexicographical relationship between the two strings.

If `s1` is lexicographically less than `s2`, wcscmp returns a negative value. If `s1` is lexicographically greater than `s2`, it returns a positive value. If the two strings are identical, wcscmp returns zero. The comparison is performed character by character, based on the numerical value of the wide characters. The comparison stops at the first differing character or when the null terminator of either string is encountered.

wcscmp is the wide character equivalent of the strcmp function, which compares standard C-style null-terminated byte strings. When dealing with strings containing characters outside the basic ASCII set, or when operating in environments that use multibyte character encodings, wcscmp is the appropriate choice for string comparison. It is important to ensure that both input strings are valid null-terminated wide character strings to avoid undefined behavior.