int strcmp_PF(const char *s1, uint_farptr_t s2) __ATTR_PURE__
The strcmp_PF() function is similar to strcmp() except that s2 is a far pointer to a string in program space
The strcmp_PF() function returns an integer less than, equal to, or greater than zero if s1 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