Return the line number that contains the character at byte count {byte} in the current buffer. This includes the end-of-line character, depending on the 'fileformat' option for the current buffer. The first character has byte count one. Also see |line2byte()|, |go| and |:goto|.

Returns -1 if the {byte} value is invalid.

Can also be used as a |method|: GetOffset()->byte2line() {not available when compiled without the |+byte_offset| feature}