#   Copyright 1988-2021 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 <http://www.gnu.org/licenses/>.

# Test that GDB saves and restores terminal settings correctly.  Also check
# the output of the "info terminal" command.

if { [prepare_for_testing "failed to prepare" term term.c] } {
    return -1
}

# Once before running the program.
gdb_test "info terminal" \
    "No saved terminal information.*" \
    "test info terminal pre-execution"

if ![runto break_here] then {
    return 0
}

# Read the inferior's terminal settings, saved in the T global variable.

proc read_term_settings_from_inferior {} {
    set termios(c_iflag) [get_hexadecimal_valueof "t.c_iflag" oops]
    set termios(c_oflag) [get_hexadecimal_valueof "t.c_oflag" oops]
    set termios(c_cflag) [get_hexadecimal_valueof "t.c_cflag" oops]
    set termios(c_lflag) [get_hexadecimal_valueof "t.c_lflag" oops]

    return [array get termios]
}

# Validate that gdb's notion of the inferior's terminal settings are consistent
# with the values read from the inferior.

proc compare_gdb_and_inferior_settings { t } {
    global decimal
    array set termios $t

    gdb_test "info terminal" \
    [multi_line "Inferior's terminal status .currently saved by GDB.:" \
                "File descriptor flags = .*" \
                "Process group = $decimal" \
                "c_iflag = ${termios(c_iflag)}, c_oflag = ${termios(c_oflag)}," \
                "c_cflag = ${termios(c_cflag)}, c_lflag = ${termios(c_lflag)}.*" ]
}

if {[target_info gdb_protocol] == ""} {
    # Record the initial terminal settings.  Verify that GDB's version of the
    # inferior's terminal settings is right.
    with_test_prefix "initial" {
        array set termios1 [read_term_settings_from_inferior]
        compare_gdb_and_inferior_settings [array get termios1]
    }

    # Continue until after the inferior removes ECHO from its terminal settings.
    gdb_continue_to_breakpoint "continue until after tcsetattr"

    # After the inferior has changed its terminal settings, check that GDB's
    # saved version reflects the new settings correctly.
    with_test_prefix "post tcsetattr" {
        array set termios2 [read_term_settings_from_inferior]
        compare_gdb_and_inferior_settings [array get termios2]

        # Make sure that the current settings are different than the initial
        # settings... otherwise this test is meaningless.
        gdb_assert {${termios1(c_lflag)} != ${termios2(c_lflag)}}
    }

    # Continue again...
    gdb_continue_to_breakpoint "continue again"

    # ... and verify again, to validate that when resuming, GDB restored the
    # inferior's terminal settings correctly.
    with_test_prefix "after last resume" {
        array set termios3 [read_term_settings_from_inferior]
        compare_gdb_and_inferior_settings [array get termios3]
        gdb_assert {${termios2(c_iflag)} == ${termios3(c_iflag)}}
        gdb_assert {${termios2(c_oflag)} == ${termios3(c_oflag)}}
        gdb_assert {${termios2(c_cflag)} == ${termios3(c_cflag)}}
        gdb_assert {${termios2(c_lflag)} == ${termios3(c_lflag)}}
    }
} else {
    # While only native targets save terminal status, we still test
    # that the command doesn't misbehave.
    gdb_test "info terminal" "No saved terminal information\\." "info terminal at breakpoint"
}

delete_breakpoints
gdb_continue_to_end

# One last time after the program having exited.
gdb_test "info terminal" \
    "No saved terminal information.*" \
    "test info terminal post-execution"