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Utilities: Implement stty
This commit adds support for most of the useful POSIX-defined features. This will come in handy when dealing with serial terminals that are implemented in #7260. Unfortunately, it isn't possible to use `Core::ArgsParser` due to the oddity of the input format. Most of this code is therefore just data wrangling and parsing.
This commit is contained in:
Daniel Bertalan
Ali Mohammad Pur
parent
529a8664f4
commit
8262d6fc68
627
Userland/Utilities/stty.cpp
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627
Userland/Utilities/stty.cpp
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/*
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* Copyright (c) 2021, Daniel Bertalan <dani@danielbertalan.dev>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#define __USE_MISC
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#define TTYDEFCHARS
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#include <AK/Array.h>
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#include <AK/Optional.h>
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#include <AK/Result.h>
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#include <AK/ScopeGuard.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/ttydefaults.h>
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#include <termios.h>
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#include <unistd.h>
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constexpr option long_options[] = {
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{ "all", no_argument, 0, 'a' },
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{ "save", no_argument, 0, 'g' },
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{ "file", required_argument, 0, 'F' },
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{ 0, 0, 0, 0 }
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};
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struct TermiosFlag {
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StringView name;
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tcflag_t value;
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tcflag_t mask;
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};
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struct BaudRate {
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speed_t speed;
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unsigned long numeric_value;
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};
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struct ControlCharacter {
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StringView name;
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unsigned index;
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};
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constexpr TermiosFlag all_iflags[] = {
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{ "ignbrk", IGNBRK, IGNBRK },
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{ "brkint", BRKINT, BRKINT },
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{ "ignpar", IGNPAR, IGNPAR },
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{ "parmer", PARMRK, PARMRK },
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{ "inpck", INPCK, INPCK },
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{ "istrip", ISTRIP, ISTRIP },
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{ "inlcr", INLCR, INLCR },
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{ "igncr", IGNCR, IGNCR },
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{ "icrnl", ICRNL, ICRNL },
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{ "iuclc", IUCLC, IUCLC },
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{ "ixon", IXON, IXON },
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{ "ixany", IXANY, IXANY },
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{ "ixoff", IXOFF, IXOFF },
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{ "imaxbel", IMAXBEL, IMAXBEL },
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{ "iutf8", IUTF8, IUTF8 }
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};
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constexpr TermiosFlag all_oflags[] = {
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{ "opost", OPOST, OPOST },
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{ "olcuc", OLCUC, OPOST },
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{ "onlcr", ONLCR, ONLCR },
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{ "onlret", ONLRET, ONLRET },
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{ "ofill", OFILL, OFILL },
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{ "ofdel", OFDEL, OFDEL },
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};
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constexpr TermiosFlag all_cflags[] = {
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{ "cs5", CS5, CSIZE },
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{ "cs6", CS6, CSIZE },
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{ "cs7", CS7, CSIZE },
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{ "cs8", CS8, CSIZE },
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{ "cstopb", CSTOPB, CSTOPB },
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{ "cread", CREAD, CREAD },
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{ "parenb", PARENB, PARENB },
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{ "parodd", PARODD, PARODD },
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{ "hupcl", HUPCL, HUPCL },
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{ "clocal", CLOCAL, CLOCAL },
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};
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constexpr TermiosFlag all_lflags[] = {
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{ "isig", ISIG, ISIG },
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{ "icanon", ICANON, ICANON },
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{ "echo", ECHO, ECHO },
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{ "echoe", ECHOE, ECHOE },
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{ "echok", ECHOK, ECHOK },
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{ "echonl", ECHONL, ECHONL },
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{ "noflsh", NOFLSH, NOFLSH },
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{ "tostop", TOSTOP, TOSTOP },
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{ "iexten", IEXTEN, IEXTEN }
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};
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constexpr BaudRate baud_rates[] = {
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{ B0, 0 },
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{ B50, 50 },
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{ B75, 75 },
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{ B110, 110 },
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{ B134, 134 },
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{ B150, 150 },
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{ B200, 200 },
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{ B300, 300 },
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{ B600, 600 },
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{ B1200, 1200 },
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{ B1800, 1800 },
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{ B2400, 2400 },
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{ B4800, 4800 },
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{ B9600, 9600 },
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{ B19200, 19200 },
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{ B38400, 38400 },
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{ B57600, 57600 },
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{ B115200, 115200 },
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{ B230400, 230400 },
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{ B460800, 460800 },
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{ B500000, 500000 },
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{ B576000, 576000 },
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{ B921600, 921600 },
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{ B1000000, 1000000 },
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{ B1152000, 1152000 },
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{ B1500000, 1500000 },
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{ B2000000, 2000000 },
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{ B2500000, 2500000 },
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{ B3000000, 3000000 },
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{ B3500000, 3500000 },
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{ B4000000, 4000000 }
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};
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constexpr ControlCharacter control_characters[] = {
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{ "intr", VINTR },
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{ "quit", VQUIT },
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{ "erase", VERASE },
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{ "kill", VKILL },
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{ "eof", VEOF },
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/* time and min are handled separately */
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{ "swtc", VSWTC },
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{ "start", VSTART },
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{ "stop", VSTOP },
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{ "susp", VSUSP },
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{ "eol", VEOL },
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{ "reprint", VREPRINT },
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{ "discard", VDISCARD },
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{ "werase", VWERASE },
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{ "lnext", VLNEXT },
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{ "eol2", VEOL2 }
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};
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Optional<speed_t> numeric_value_to_speed(unsigned long);
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Optional<unsigned long> speed_to_numeric_value(speed_t);
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void print_stty_readable(const termios&);
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void print_human_readable(const termios&, const winsize&, bool);
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Result<void, int> apply_stty_readable_modes(StringView, termios&);
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Result<void, int> apply_modes(size_t, char**, termios&, winsize&);
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Optional<speed_t> numeric_value_to_speed(unsigned long numeric_value)
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{
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for (auto rate : baud_rates) {
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if (rate.numeric_value == numeric_value)
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return rate.speed;
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}
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return {};
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}
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Optional<unsigned long> speed_to_numeric_value(speed_t speed)
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{
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for (auto rate : baud_rates) {
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if (rate.speed == speed)
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return rate.numeric_value;
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}
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return {};
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}
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void print_stty_readable(const termios& modes)
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{
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out("{:x}:{:x}:{:x}:{:x}", modes.c_iflag, modes.c_oflag, modes.c_cflag, modes.c_lflag);
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for (size_t i = 0; i < NCCS; ++i)
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out(":{:x}", modes.c_cc[i]);
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out(":{:x}:{:x}\n", modes.c_ispeed, modes.c_ospeed);
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}
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void print_human_readable(const termios& modes, const winsize& ws, bool verbose_mode)
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{
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auto print_speed = [&] {
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if (verbose_mode && modes.c_ispeed != modes.c_ospeed) {
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out("ispeed {} baud; ospeed {} baud;", speed_to_numeric_value(modes.c_ispeed).value(), speed_to_numeric_value(modes.c_ospeed).value());
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} else {
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out("speed {} baud;", speed_to_numeric_value(modes.c_ispeed).value());
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}
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};
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auto print_winsize = [&] {
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out("rows {}; columns {};", ws.ws_row, ws.ws_col);
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};
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auto escape_character = [&](u8 ch) {
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StringBuilder sb;
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if (ch <= 0x20) {
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sb.append("^");
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sb.append(ch + 0x40);
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} else if (ch == 0x7f) {
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sb.append("^?");
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} else {
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sb.append(ch);
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}
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return sb.to_string();
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};
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auto print_control_characters = [&] {
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bool first_in_line = true;
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for (auto cc : control_characters) {
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if (verbose_mode || modes.c_cc[cc.index] != ttydefchars[cc.index]) {
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out("{}{} = {};", (first_in_line) ? "" : " ", cc.name, escape_character(modes.c_cc[cc.index]));
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first_in_line = false;
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}
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}
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if (!first_in_line)
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out("\n");
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};
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auto print_flags_of_type = [&](const TermiosFlag flags[], size_t flag_count, tcflag_t field_value, tcflag_t field_default) {
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bool first_in_line = true;
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for (size_t i = 0; i < flag_count; ++i) {
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auto& flag = flags[i];
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if (verbose_mode || (field_value & flag.mask) != (field_default & flag.mask)) {
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bool set = (field_value & flag.mask) == flag.value;
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out("{}{}{}", first_in_line ? "" : " ", set ? "" : "-", flag.name);
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first_in_line = false;
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}
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}
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if (!first_in_line)
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out("\n");
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};
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auto print_flags = [&] {
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print_flags_of_type(all_cflags, sizeof(all_cflags) / sizeof(TermiosFlag), modes.c_iflag, TTYDEF_CFLAG);
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print_flags_of_type(all_oflags, sizeof(all_oflags) / sizeof(TermiosFlag), modes.c_oflag, TTYDEF_OFLAG);
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print_flags_of_type(all_iflags, sizeof(all_iflags) / sizeof(TermiosFlag), modes.c_cflag, TTYDEF_IFLAG);
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print_flags_of_type(all_lflags, sizeof(all_lflags) / sizeof(TermiosFlag), modes.c_lflag, TTYDEF_LFLAG);
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};
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print_speed();
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out(" ");
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print_winsize();
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out("\n");
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print_control_characters();
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print_flags();
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}
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Result<void, int> apply_stty_readable_modes(StringView mode_string, termios& t)
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{
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auto split = mode_string.split_view(':');
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if (split.size() != 4 + NCCS + 2) {
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warnln("Save string has an incorrect number of parameters");
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return 1;
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}
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auto parse_hex = [&](const StringView& v) {
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tcflag_t ret = 0;
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for (auto c : v) {
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c = tolower(c);
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ret *= 16;
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if (isdigit(c)) {
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ret += c - '0';
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} else {
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VERIFY(c >= 'a' && c <= 'f');
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ret += c - 'a';
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}
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}
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return ret;
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};
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t.c_iflag = parse_hex(split[0]);
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t.c_oflag = parse_hex(split[1]);
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t.c_cflag = parse_hex(split[2]);
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t.c_lflag = parse_hex(split[3]);
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for (size_t i = 0; i < NCCS; ++i) {
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t.c_cc[i] = (cc_t)parse_hex(split[4 + i]);
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}
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t.c_ispeed = parse_hex(split[4 + NCCS]);
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t.c_ospeed = parse_hex(split[4 + NCCS + 1]);
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return {};
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}
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Result<void, int> apply_modes(size_t parameter_count, char** raw_parameters, termios& t, winsize& w)
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{
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Vector<StringView> parameters;
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parameters.ensure_capacity(parameter_count);
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for (size_t i = 0; i < parameter_count; ++i)
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parameters.append(StringView(raw_parameters[i]));
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auto parse_baud = [&](size_t idx) -> Optional<speed_t> {
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auto maybe_numeric_value = parameters[idx].to_uint<uint32_t>();
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if (maybe_numeric_value.has_value())
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return numeric_value_to_speed(maybe_numeric_value.value());
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return {};
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};
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auto parse_number = [&](size_t idx) -> Optional<cc_t> {
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return parameters[idx].to_uint<cc_t>();
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};
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auto looks_like_stty_readable = [&](size_t idx) {
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bool contains_colon = false;
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for (auto c : parameters[idx]) {
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c = tolower(c);
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if (!isdigit(c) && !(c >= 'a' && c <= 'f') && c != ':')
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return false;
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if (c == ':')
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contains_colon = true;
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}
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return contains_colon;
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};
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auto parse_control_character = [&](size_t idx) -> Result<cc_t, int> {
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VERIFY(!parameters[idx].is_empty());
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if (parameters[idx] == "^-" || parameters[idx] == "undef") {
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// FIXME: disabling characters is a bit wonky right now in TTY.
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// We should add the _POSIX_VDISABLE macro.
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return (cc_t)0;
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} else if (parameters[idx][0] == '^' && parameters[idx].length() == 2) {
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return (cc_t)toupper(parameters[idx][1]) - 0x40;
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} else if (parameters[idx].starts_with("0x")) {
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cc_t value = 0;
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if (parameters[idx].length() == 2) {
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warnln("Invalid hexadecimal character code {}", parameters[idx]);
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return (int)1;
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}
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for (size_t i = 2; i < parameters[idx].length(); ++i) {
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char ch = tolower(parameters[idx][i]);
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if (!isdigit(ch) && !(ch >= 'a' && ch <= 'f')) {
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warnln("Invalid hexadecimal character code {}", parameters[idx]);
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return (int)1;
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}
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value = 16 * value + (isdigit(ch)) ? (ch - '0') : (ch - 'a');
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}
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return value;
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} else if (parameters[idx].starts_with("0")) {
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cc_t value = 0;
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for (size_t i = 1; i < parameters[idx].length(); ++i) {
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char ch = parameters[idx][i];
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if (!(ch >= '0' && ch <= '7')) {
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warnln("Invalid octal character code {}", parameters[idx]);
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return (int)1;
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}
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value = 8 * value + (ch - '0');
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}
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return value;
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} else if (isdigit(parameters[idx][0])) {
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auto maybe_value = parameters[idx].to_uint<cc_t>();
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if (!maybe_value.has_value()) {
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warnln("Invalid decimal character code {}", parameters[idx]);
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return (int)1;
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}
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return maybe_value.value();
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} else if (parameters[idx].length() == 1) {
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return parameters[idx][0];
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}
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warnln("Invalid control character {}", parameters[idx]);
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return (int)1;
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};
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size_t parameter_idx = 0;
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auto parse_flag_or_char = [&]() -> Result<void, int> {
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if (parameters[parameter_idx][0] != '-') {
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if (parameters[parameter_idx] == "min") {
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auto maybe_number = parse_number(++parameter_idx);
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if (!maybe_number.has_value()) {
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warnln("Error parsing min: {} is not a number", parameters[parameter_idx]);
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return 1;
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}
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return {};
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} else if (parameters[parameter_idx] == "time") {
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auto maybe_number = parse_number(++parameter_idx);
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if (!maybe_number.has_value()) {
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warnln("Error parsing time: {} is not a number", parameters[parameter_idx]);
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return 1;
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}
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return {};
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} else {
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for (auto cc : control_characters) {
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if (cc.name == parameters[parameter_idx]) {
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if (parameter_idx == parameter_count - 1) {
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warnln("No control character specified for {}", cc.name);
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return 1;
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}
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auto control_character_or_error = parse_control_character(++parameter_idx);
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if (control_character_or_error.is_error())
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return control_character_or_error.error();
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t.c_cc[cc.index] = control_character_or_error.value();
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return {};
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}
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}
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}
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}
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// We fall through to here if what we are setting is not a control character.
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bool negate = false;
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if (parameters[parameter_idx][0] == '-') {
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negate = true;
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parameters[parameter_idx] = parameters[parameter_idx].substring_view(1);
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}
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auto perform_masking = [&](tcflag_t value, tcflag_t mask, tcflag_t& dest) {
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if (negate)
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dest &= ~mask;
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else
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dest = (dest & (~mask)) | value;
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};
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for (auto flag : all_iflags) {
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if (flag.name == parameters[parameter_idx]) {
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perform_masking(flag.value, flag.mask, t.c_iflag);
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return {};
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}
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}
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for (auto flag : all_oflags) {
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if (flag.name == parameters[parameter_idx]) {
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perform_masking(flag.value, flag.mask, t.c_oflag);
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return {};
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}
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}
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for (auto flag : all_cflags) {
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if (flag.name == parameters[parameter_idx]) {
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perform_masking(flag.value, flag.mask, t.c_cflag);
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return {};
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}
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}
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for (auto flag : all_lflags) {
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if (flag.name == parameters[parameter_idx]) {
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perform_masking(flag.value, flag.mask, t.c_lflag);
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return {};
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}
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}
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warnln("Invalid control flag or control character name {}", parameters[parameter_idx]);
|
||||
return 1;
|
||||
};
|
||||
|
||||
while (parameter_idx < parameter_count) {
|
||||
if (looks_like_stty_readable(parameter_idx)) {
|
||||
auto maybe_error = apply_stty_readable_modes(parameters[parameter_idx], t);
|
||||
if (maybe_error.is_error())
|
||||
return maybe_error.error();
|
||||
} else if (isdigit(parameters[parameter_idx][0])) {
|
||||
auto new_baud = parse_baud(parameter_idx);
|
||||
if (!new_baud.has_value()) {
|
||||
warnln("Invalid baud rate {}", parameters[parameter_idx]);
|
||||
return 1;
|
||||
}
|
||||
t.c_ispeed = t.c_ospeed = new_baud.value();
|
||||
} else if (parameters[parameter_idx] == "ispeed") {
|
||||
if (parameter_idx == parameter_count - 1) {
|
||||
warnln("No baud rate specified for ispeed");
|
||||
return 1;
|
||||
}
|
||||
auto new_baud = parse_baud(++parameter_idx);
|
||||
if (!new_baud.has_value()) {
|
||||
warnln("Invalid input baud rate {}", parameters[parameter_idx]);
|
||||
return 1;
|
||||
}
|
||||
t.c_ispeed = new_baud.value();
|
||||
} else if (parameters[parameter_idx] == "ospeed") {
|
||||
if (parameter_idx == parameter_count - 1) {
|
||||
warnln("No baud rate specified for ospeed");
|
||||
return 1;
|
||||
}
|
||||
auto new_baud = parse_baud(++parameter_idx);
|
||||
if (!new_baud.has_value()) {
|
||||
warnln("Invalid output baud rate {}", parameters[parameter_idx]);
|
||||
return 1;
|
||||
}
|
||||
t.c_ospeed = new_baud.value();
|
||||
} else if (parameters[parameter_idx] == "columns" || parameters[parameter_idx] == "cols") {
|
||||
auto maybe_number = parse_number(++parameter_idx);
|
||||
if (!maybe_number.has_value()) {
|
||||
warnln("Invalid column count {}", parameters[parameter_idx]);
|
||||
return 1;
|
||||
}
|
||||
w.ws_col = maybe_number.value();
|
||||
} else if (parameters[parameter_idx] == "rows") {
|
||||
auto maybe_number = parse_number(++parameter_idx);
|
||||
if (!maybe_number.has_value()) {
|
||||
warnln("Invalid row count {}", parameters[parameter_idx]);
|
||||
return 1;
|
||||
}
|
||||
w.ws_row = maybe_number.value();
|
||||
} else if (parameters[parameter_idx] == "evenp" || parameters[parameter_idx] == "parity") {
|
||||
t.c_cflag &= ~(CSIZE | PARODD);
|
||||
t.c_cflag |= CS7 | PARENB;
|
||||
} else if (parameters[parameter_idx] == "oddp") {
|
||||
t.c_cflag &= ~(CSIZE);
|
||||
t.c_cflag |= CS7 | PARENB | PARODD;
|
||||
} else if (parameters[parameter_idx] == "-parity" || parameters[parameter_idx] == "-evenp" || parameters[parameter_idx] == "-oddp") {
|
||||
t.c_cflag &= ~(PARENB | CSIZE);
|
||||
t.c_cflag |= CS8;
|
||||
} else if (parameters[parameter_idx] == "raw") {
|
||||
cfmakeraw(&t);
|
||||
} else if (parameters[parameter_idx] == "nl") {
|
||||
t.c_iflag &= ~ICRNL;
|
||||
} else if (parameters[parameter_idx] == "-nl") {
|
||||
t.c_cflag &= ~(INLCR & IGNCR);
|
||||
t.c_iflag |= ICRNL;
|
||||
} else if (parameters[parameter_idx] == "ek") {
|
||||
t.c_cc[VERASE] = CERASE;
|
||||
t.c_cc[VKILL] = CKILL;
|
||||
} else if (parameters[parameter_idx] == "sane") {
|
||||
t.c_iflag = TTYDEF_IFLAG;
|
||||
t.c_oflag = TTYDEF_OFLAG;
|
||||
t.c_cflag = TTYDEF_CFLAG;
|
||||
t.c_lflag = TTYDEF_LFLAG;
|
||||
for (size_t i = 0; i < NCCS; ++i)
|
||||
t.c_cc[i] = ttydefchars[i];
|
||||
t.c_ispeed = t.c_ospeed = TTYDEF_SPEED;
|
||||
} else {
|
||||
auto maybe_error = parse_flag_or_char();
|
||||
if (maybe_error.is_error())
|
||||
return maybe_error.error();
|
||||
}
|
||||
++parameter_idx;
|
||||
}
|
||||
return {};
|
||||
}
|
||||
|
||||
int main(int argc, char** argv)
|
||||
{
|
||||
if (pledge("stdio tty rpath", nullptr) < 0) {
|
||||
perror("pledge");
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (unveil("/dev", "r") < 0) {
|
||||
perror("unveil");
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (unveil(nullptr, nullptr) < 0) {
|
||||
perror("unveil");
|
||||
return 1;
|
||||
}
|
||||
|
||||
String device_file;
|
||||
bool stty_readable = false;
|
||||
bool all_settings = false;
|
||||
|
||||
// Core::ArgsParser can't handle the weird syntax of stty, so we use getopt_long instead.
|
||||
opterr = 0; // We handle unknown flags gracefully by starting to parse the arguments in `apply_modes`.
|
||||
int optc;
|
||||
bool should_quit = false;
|
||||
while (!should_quit && ((optc = getopt_long(argc, argv, "-agF:", long_options, nullptr)) != -1)) {
|
||||
switch (optc) {
|
||||
case 'a':
|
||||
all_settings = true;
|
||||
break;
|
||||
case 'g':
|
||||
stty_readable = true;
|
||||
break;
|
||||
case 'F':
|
||||
if (!device_file.is_empty()) {
|
||||
warnln("Only one device may be specified");
|
||||
exit(1);
|
||||
}
|
||||
device_file = optarg;
|
||||
break;
|
||||
default:
|
||||
should_quit = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (stty_readable && all_settings) {
|
||||
warnln("Save mode and all-settings mode are mutually exclusive");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
int terminal_fd = STDIN_FILENO;
|
||||
if (!device_file.is_empty()) {
|
||||
if ((terminal_fd = open(device_file.characters(), O_RDONLY, 0)) < 0) {
|
||||
perror("open");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
ScopeGuard file_close_guard = [&] { close(terminal_fd); };
|
||||
|
||||
termios initial_termios;
|
||||
if (tcgetattr(terminal_fd, &initial_termios) < 0) {
|
||||
perror("tcgetattr");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
winsize initial_winsize;
|
||||
if (ioctl(terminal_fd, TIOCGWINSZ, &initial_winsize) < 0) {
|
||||
perror("ioctl(TIOCGWINSZ)");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if (optind < argc) {
|
||||
if (stty_readable || all_settings) {
|
||||
warnln("Modes cannot be set when printing settings");
|
||||
exit(1);
|
||||
}
|
||||
auto result = apply_modes(argc - optind, argv + optind, initial_termios, initial_winsize);
|
||||
if (result.is_error())
|
||||
return result.error();
|
||||
|
||||
if (tcsetattr(terminal_fd, TCSADRAIN, &initial_termios) < 0) {
|
||||
perror("tcsetattr");
|
||||
exit(1);
|
||||
}
|
||||
if (ioctl(terminal_fd, TIOCSWINSZ, &initial_winsize) < 0) {
|
||||
perror("ioctl(TIOCSWINSZ)");
|
||||
exit(1);
|
||||
}
|
||||
} else if (stty_readable) {
|
||||
print_stty_readable(initial_termios);
|
||||
} else {
|
||||
print_human_readable(initial_termios, initial_winsize, all_settings);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in a new issue