guess_lines       652 src/io.c             middle_guess = guess_lines (0, 0, p0 - filevec[0].prefix_end);
guess_lines       653 src/io.c             suffix_guess = guess_lines (0, 0, buffer0 + n0 - p0);
guess_lines       662 src/io.c             alloc_lines0 = guess_lines (0, 0, n0);
guess_lines       695 src/io.c         middle_guess = guess_lines (lines, p0 - buffer0, p1 - filevec[1].prefix_end);
guess_lines       696 src/io.c         suffix_guess = guess_lines (lines, p0 - buffer0, buffer1 + n1 - p1);