pub fn parse_next_utf8(utf8: &[u8]) -> (TCodepoint, i32)Expand description
Decode the first codepoint from a UTF-8 byte slice.
Returns (codepoint, bytes_consumed). On invalid UTF-8 (bad first
byte, missing/invalid continuation byte, or truncated input)
returns (INVALID_UTF8, 0) — faithful to C++ ParseNextUTF8.