utf8FindPrevChar
fn
string utf8FindPrevChar(string str, string p)Given a position p with a UTF-8 encoded string str, find the start of the previous UTF-8 character starting before p. Returns null if no UTF-8 characters are present in str before p.
p does not have to be at the beginning of a UTF-8 character. No check is made to see if the character found is actually valid other than it starts with an appropriate byte.
Parameters
str | pointer to the beginning of a UTF-8 encoded string |
p | pointer to some position within str |
Returns
a pointer to the found character or null.