Locate a substring.

char * strstr_PF(
	const char * s1,
	uint_farptr_t s2)

The strstr_PF() function finds the first occurrence of the substring s2 in the string s1. The terminating '\0' characters are not compared. The strstr_PF() function is similar to strstr() except that s2 is a far pointer to a string in program space.


The strstr_PF() function returns a pointer to the beginning of the substring, or NULL if the substring is not found. If s2 points to a string of zero length, the function returns s1. The contents of RAMPZ SFR are undefined when the function returns