Find the rightmost occurrence of the given Unicode character in a UTF-8 encoded string, while limiting the search to len bytes. If len is -1, allow unbounded search.
a nul-terminated UTF-8 encoded string
the maximum length of p
a Unicode character
NULL if the string does not contain the character, otherwise, a pointer to the start of the rightmost occurrence of the character in the string.
Find the rightmost occurrence of the given Unicode character in a UTF-8 encoded string, while limiting the search to len bytes. If len is -1, allow unbounded search.