int strncasecmp_PF(const char *s1, uint_farptr_t s2, size_t n) __ATTR_PURE__
The strncasecmp_PF() function is similar to strcasecmp_PF(), except it only compares the first n characters of s1 and the string in flash is addressed using a far pointer.
The strncasecmp_PF() function returns an integer less than, equal to, or greater than zero if s1 (or the first n bytes thereof) is found, respectively, to be less than, to match, or be greater than s2. The contents of RAMPZ SFR are undefined when the function returns.