Compares up to n letters of two strings.


int ustrncmp(const char *s1, const char *s2, int n);
This function compares up to `n' characters of `s1' and `s2'. Example:
      if (ustrncmp(prefix, long_string, ustrlen(prefix)) == 0) {
	 /* long_string starts with prefix */
Returns zero if the substrings are equal, a positive number if `s1' comes after `s2' in the ASCII collating sequence, else a negative number.

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