Function complete_rows_len 

pub fn complete_rows_len(
    bytes: &[u8],
    quote_char: Option<u8>,
    comment_prefix: Option<&CommentPrefix>,
    eol_char: u8,
    skip_lines: usize,
) -> usize

Available on crate features csv or json only.

Returns the length of the longest prefix of bytes that only holds complete rows, i.e. up to and including the last eol_char outside of a quoted field. Like skip_lines itself, the first skip_lines lines are split without regard to quoting. Like the CSV reader, a UTF-8 BOM after them is skipped, so that a comment prefix on the next line is found.