| # When reading a specified number of lines, ensure that the output | |
| # file pointer is positioned just after those lines. | |
| # Copyright (C) 2002-2025 Free Software Foundation, Inc. | |
| # This program is free software: you can redistribute it and/or modify | |
| # it under the terms of the GNU General Public License as published by | |
| # the Free Software Foundation, either version 3 of the License, or | |
| # (at your option) any later version. | |
| # This program is distributed in the hope that it will be useful, | |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| # GNU General Public License for more details. | |
| # You should have received a copy of the GNU General Public License | |
| # along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src | |
| print_ver_ head | |
| (echo a; echo b) > in || framework_failure_ | |
| echo b > exp || framework_failure_ | |
| for i in -1 1; do | |
| (head -n $i >/dev/null; cat) < in > out || fail=1 | |
| compare exp out || fail=1 | |
| done | |
| # Exercise the (start_pos < pos) block in elide_tail_lines_seekable. | |
| # So far, this is the only test to do that. | |
| # Do that by creating a file larger than BUFSIZ (I've seen 128K) and | |
| # elide a suffix of it (by line count) that is also larger than BUFSIZ. | |
| # 50000 lines times 6 bytes per line gives us enough leeway even on a | |
| # system with a BUFSIZ of 256K. | |
| n_lines=50000 | |
| seq 70000 > in2 || framework_failure_ | |
| echo $n_lines > exp-n || framework_failure_ | |
| (head -n-$n_lines>/dev/null; wc -l) < in2 > n | |
| compare exp-n n || fail=1 | |
| Exit $fail | |