http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47694
--- Comment #7 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-02-14 21:23:27 UTC --- The data is read via: read_a -> read_block_form -> read_sf -> fbuf_read read_sf has the nice comment: "When reading sequential formatted records we have a problem. We don't know how long the line is until we read the trailing newline, and we don't want to read too much. [...] Given this, the solution is to read a byte at a time, stopping if we hit the newline." However, the first action it does is: /* Read data into format buffer and scan through it. */ lorig = *length; base = p = fbuf_read (dtp->u.p.current_unit, length); length is 1024 (cf. comment 0). Thus, [if (oldpos + *len > oldact)], it invokes sread. I think the solution is to read from the buffer until its end - and then call, if needed, fbuf_read for the remaining "length-already_read" characters. (I do not see whether there are additional issues, but this should solve at least one issue.)
