tests/stty/stty.sh
#!/bin/sh
# Make sure stty can parse most of its options.

# Copyright (C) 1998-2025 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/>.

# Make sure there's a tty on stdin.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ stty

require_controlling_input_terminal_
require_trap_signame_
require_strace_ ioctl

trap '' TTOU # Ignore SIGTTOU

# Get the reversible settings from stty.c.
stty_reversible_init_

saved_state=.saved-state
stty --save > $saved_state || fail=1
stty $(cat $saved_state) || fail=1

# This would segfault prior to sh-utils-2.0j.
stty erase - || fail=1

# Ensure "immediate" and "wait" mode supported, with and without settings
for mode in '-drain' 'drain'; do
  for opt in 'echo' ''; do
    stty "$mode" $opt || fail=1
  done
done

# These would improperly ignore invalid options through coreutils 5.2.1.
returns_ 1 stty -F 2>/dev/null || fail=1
returns_ 1 stty -raw -F no/such/file 2>/dev/null || fail=1
returns_ 1 stty -raw -a 2>/dev/null || fail=1

# Build a list of all boolean options stty accepts on this system.
# Don't depend on terminal width.  Put each option on its own line,
# remove all non-boolean ones, then remove any leading hyphens.
sed_del='/^speed/d;/^rows/d;/^columns/d;/ = /d'
options=$(stty -a | tr -s ';' '\n' | sed "s/^ //;$sed_del;s/-//g")

# Take them one at a time, with and without the leading '-'.
for opt in $options; do
  # 'stty parenb' and 'stty -parenb' fail with this message
  # stty: standard input: unable to perform all requested operations
  # on Linux 2.2.0-pre4 kernels.  Also since around Linux 2.6.30
  # other serial control settings give the same error. So skip them.
  # Also on ppc*|sparc* glibc platforms 'icanon' gives the same error.
  # See: https://bugs.gnu.org/7228#14
  case $opt in
    parenb|parodd|cmspar) continue;;
    cstopb|crtscts|cdtrdsr|icanon) continue;;
  esac

  # This is listed as supported on FreeBSD
  # but the ioctl returns ENOTTY.
  test $opt = extproc && continue

  stty $opt || fail=1

  # Likewise, 'stty -cread' would fail, so skip that, too.
  test $opt = cread && continue
  if stty_reversible_query_ "$opt" ; then
    stty -$opt || { fail=1; echo -$opt; }
  fi
done

stty $(cat $saved_state)

# Ensure we validate options before accessing the device
strace -o log1 -e ioctl stty --version || fail=1
n_ioctl1=$(wc -l < log1) || framework_failure_
returns_ 1 strace -o log2 -e ioctl stty -blahblah || fail=1
n_ioctl2=$(wc -l < log2) || framework_failure_
test "$n_ioctl1" -ge "$n_ioctl2" || fail=1

# Ensure we wrap output appropriately
for W in $(seq 80 90); do
  output_width=$(COLUMNS="$W" stty -a | wc -L)
  test "$output_width" -le "$W" || fail=1
done

# Ensure we support varied numeric forms
# with appropriate rounding
if stty ispeed '9600'; then
  stty ispeed '  +9600' || fail=1
  stty ispeed '9600.49' || fail=1
  stty ispeed '9600.50' || fail=1
  stty ispeed '9599.51' || fail=1
  stty ispeed '  9600.' || fail=1
fi

Exit $fail
