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ladybird/Userland/Utilities/stty.cpp
Daniel Bertalan 4531f689ff Userland: Fix incorrect iflag/oflag printing in stty 
The `c_iflag` and `c_oflag` fields were swapped in the source code which
caused the bit values to be interpreted as the wrong flag. It was a
stupid mistake on my part.
2021-06-10 23:44:14 +02:00

627 lines
20 KiB
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/*
* Copyright (c) 2021, Daniel Bertalan <dani@danielbertalan.dev>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#define __USE_MISC
#define TTYDEFCHARS
#include <AK/Array.h>
#include <AK/Optional.h>
#include <AK/Result.h>
#include <AK/ScopeGuard.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <ctype.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/ttydefaults.h>
#include <termios.h>
#include <unistd.h>
constexpr option long_options[] = {
{ "all", no_argument, 0, 'a' },
{ "save", no_argument, 0, 'g' },
{ "file", required_argument, 0, 'F' },
{ 0, 0, 0, 0 }
};
struct TermiosFlag {
StringView name;
tcflag_t value;
tcflag_t mask;
};
struct BaudRate {
speed_t speed;
unsigned long numeric_value;
};
struct ControlCharacter {
StringView name;
unsigned index;
};
constexpr TermiosFlag all_iflags[] = {
{ "ignbrk", IGNBRK, IGNBRK },
{ "brkint", BRKINT, BRKINT },
{ "ignpar", IGNPAR, IGNPAR },
{ "parmer", PARMRK, PARMRK },
{ "inpck", INPCK, INPCK },
{ "istrip", ISTRIP, ISTRIP },
{ "inlcr", INLCR, INLCR },
{ "igncr", IGNCR, IGNCR },
{ "icrnl", ICRNL, ICRNL },
{ "iuclc", IUCLC, IUCLC },
{ "ixon", IXON, IXON },
{ "ixany", IXANY, IXANY },
{ "ixoff", IXOFF, IXOFF },
{ "imaxbel", IMAXBEL, IMAXBEL },
{ "iutf8", IUTF8, IUTF8 }
};
constexpr TermiosFlag all_oflags[] = {
{ "opost", OPOST, OPOST },
{ "olcuc", OLCUC, OPOST },
{ "onlcr", ONLCR, ONLCR },
{ "onlret", ONLRET, ONLRET },
{ "ofill", OFILL, OFILL },
{ "ofdel", OFDEL, OFDEL },
};
constexpr TermiosFlag all_cflags[] = {
{ "cs5", CS5, CSIZE },
{ "cs6", CS6, CSIZE },
{ "cs7", CS7, CSIZE },
{ "cs8", CS8, CSIZE },
{ "cstopb", CSTOPB, CSTOPB },
{ "cread", CREAD, CREAD },
{ "parenb", PARENB, PARENB },
{ "parodd", PARODD, PARODD },
{ "hupcl", HUPCL, HUPCL },
{ "clocal", CLOCAL, CLOCAL },
};
constexpr TermiosFlag all_lflags[] = {
{ "isig", ISIG, ISIG },
{ "icanon", ICANON, ICANON },
{ "echo", ECHO, ECHO },
{ "echoe", ECHOE, ECHOE },
{ "echok", ECHOK, ECHOK },
{ "echonl", ECHONL, ECHONL },
{ "noflsh", NOFLSH, NOFLSH },
{ "tostop", TOSTOP, TOSTOP },
{ "iexten", IEXTEN, IEXTEN }
};
constexpr BaudRate baud_rates[] = {
{ B0, 0 },
{ B50, 50 },
{ B75, 75 },
{ B110, 110 },
{ B134, 134 },
{ B150, 150 },
{ B200, 200 },
{ B300, 300 },
{ B600, 600 },
{ B1200, 1200 },
{ B1800, 1800 },
{ B2400, 2400 },
{ B4800, 4800 },
{ B9600, 9600 },
{ B19200, 19200 },
{ B38400, 38400 },
{ B57600, 57600 },
{ B115200, 115200 },
{ B230400, 230400 },
{ B460800, 460800 },
{ B500000, 500000 },
{ B576000, 576000 },
{ B921600, 921600 },
{ B1000000, 1000000 },
{ B1152000, 1152000 },
{ B1500000, 1500000 },
{ B2000000, 2000000 },
{ B2500000, 2500000 },
{ B3000000, 3000000 },
{ B3500000, 3500000 },
{ B4000000, 4000000 }
};
constexpr ControlCharacter control_characters[] = {
{ "intr", VINTR },
{ "quit", VQUIT },
{ "erase", VERASE },
{ "kill", VKILL },
{ "eof", VEOF },
/* time and min are handled separately */
{ "swtc", VSWTC },
{ "start", VSTART },
{ "stop", VSTOP },
{ "susp", VSUSP },
{ "eol", VEOL },
{ "reprint", VREPRINT },
{ "discard", VDISCARD },
{ "werase", VWERASE },
{ "lnext", VLNEXT },
{ "eol2", VEOL2 }
};
Optional<speed_t> numeric_value_to_speed(unsigned long);
Optional<unsigned long> speed_to_numeric_value(speed_t);
void print_stty_readable(const termios&);
void print_human_readable(const termios&, const winsize&, bool);
Result<void, int> apply_stty_readable_modes(StringView, termios&);
Result<void, int> apply_modes(size_t, char**, termios&, winsize&);
Optional<speed_t> numeric_value_to_speed(unsigned long numeric_value)
{
for (auto rate : baud_rates) {
if (rate.numeric_value == numeric_value)
return rate.speed;
}
return {};
}
Optional<unsigned long> speed_to_numeric_value(speed_t speed)
{
for (auto rate : baud_rates) {
if (rate.speed == speed)
return rate.numeric_value;
}
return {};
}
void print_stty_readable(const termios& modes)
{
out("{:x}:{:x}:{:x}:{:x}", modes.c_iflag, modes.c_oflag, modes.c_cflag, modes.c_lflag);
for (size_t i = 0; i < NCCS; ++i)
out(":{:x}", modes.c_cc[i]);
out(":{:x}:{:x}\n", modes.c_ispeed, modes.c_ospeed);
}
void print_human_readable(const termios& modes, const winsize& ws, bool verbose_mode)
{
auto print_speed = [&] {
if (verbose_mode && modes.c_ispeed != modes.c_ospeed) {
out("ispeed {} baud; ospeed {} baud;", speed_to_numeric_value(modes.c_ispeed).value(), speed_to_numeric_value(modes.c_ospeed).value());
} else {
out("speed {} baud;", speed_to_numeric_value(modes.c_ispeed).value());
}
};
auto print_winsize = [&] {
out("rows {}; columns {};", ws.ws_row, ws.ws_col);
};
auto escape_character = [&](u8 ch) {
StringBuilder sb;
if (ch <= 0x20) {
sb.append("^");
sb.append(ch + 0x40);
} else if (ch == 0x7f) {
sb.append("^?");
} else {
sb.append(ch);
}
return sb.to_string();
};
auto print_control_characters = [&] {
bool first_in_line = true;
for (auto cc : control_characters) {
if (verbose_mode || modes.c_cc[cc.index] != ttydefchars[cc.index]) {
out("{}{} = {};", (first_in_line) ? "" : " ", cc.name, escape_character(modes.c_cc[cc.index]));
first_in_line = false;
}
}
if (!first_in_line)
out("\n");
};
auto print_flags_of_type = [&](const TermiosFlag flags[], size_t flag_count, tcflag_t field_value, tcflag_t field_default) {
bool first_in_line = true;
for (size_t i = 0; i < flag_count; ++i) {
auto& flag = flags[i];
if (verbose_mode || (field_value & flag.mask) != (field_default & flag.mask)) {
bool set = (field_value & flag.mask) == flag.value;
out("{}{}{}", first_in_line ? "" : " ", set ? "" : "-", flag.name);
first_in_line = false;
}
}
if (!first_in_line)
out("\n");
};
auto print_flags = [&] {
print_flags_of_type(all_cflags, sizeof(all_cflags) / sizeof(TermiosFlag), modes.c_cflag, TTYDEF_CFLAG);
print_flags_of_type(all_oflags, sizeof(all_oflags) / sizeof(TermiosFlag), modes.c_oflag, TTYDEF_OFLAG);
print_flags_of_type(all_iflags, sizeof(all_iflags) / sizeof(TermiosFlag), modes.c_iflag, TTYDEF_IFLAG);
print_flags_of_type(all_lflags, sizeof(all_lflags) / sizeof(TermiosFlag), modes.c_lflag, TTYDEF_LFLAG);
};
print_speed();
out(" ");
print_winsize();
out("\n");
print_control_characters();
print_flags();
}
Result<void, int> apply_stty_readable_modes(StringView mode_string, termios& t)
{
auto split = mode_string.split_view(':');
if (split.size() != 4 + NCCS + 2) {
warnln("Save string has an incorrect number of parameters");
return 1;
}
auto parse_hex = [&](const StringView& v) {
tcflag_t ret = 0;
for (auto c : v) {
c = tolower(c);
ret *= 16;
if (isdigit(c)) {
ret += c - '0';
} else {
VERIFY(c >= 'a' && c <= 'f');
ret += c - 'a';
}
}
return ret;
};
t.c_iflag = parse_hex(split[0]);
t.c_oflag = parse_hex(split[1]);
t.c_cflag = parse_hex(split[2]);
t.c_lflag = parse_hex(split[3]);
for (size_t i = 0; i < NCCS; ++i) {
t.c_cc[i] = (cc_t)parse_hex(split[4 + i]);
}
t.c_ispeed = parse_hex(split[4 + NCCS]);
t.c_ospeed = parse_hex(split[4 + NCCS + 1]);
return {};
}
Result<void, int> apply_modes(size_t parameter_count, char** raw_parameters, termios& t, winsize& w)
{
Vector<StringView> parameters;
parameters.ensure_capacity(parameter_count);
for (size_t i = 0; i < parameter_count; ++i)
parameters.append(StringView(raw_parameters[i]));
auto parse_baud = [&](size_t idx) -> Optional<speed_t> {
auto maybe_numeric_value = parameters[idx].to_uint<uint32_t>();
if (maybe_numeric_value.has_value())
return numeric_value_to_speed(maybe_numeric_value.value());
return {};
};
auto parse_number = [&](size_t idx) -> Optional<cc_t> {
return parameters[idx].to_uint<cc_t>();
};
auto looks_like_stty_readable = [&](size_t idx) {
bool contains_colon = false;
for (auto c : parameters[idx]) {
c = tolower(c);
if (!isdigit(c) && !(c >= 'a' && c <= 'f') && c != ':')
return false;
if (c == ':')
contains_colon = true;
}
return contains_colon;
};
auto parse_control_character = [&](size_t idx) -> Optional<cc_t> {
VERIFY(!parameters[idx].is_empty());
if (parameters[idx] == "^-" || parameters[idx] == "undef") {
// FIXME: disabling characters is a bit wonky right now in TTY.
// We should add the _POSIX_VDISABLE macro.
return 0;
} else if (parameters[idx][0] == '^' && parameters[idx].length() == 2) {
return toupper(parameters[idx][1]) - 0x40;
} else if (parameters[idx].starts_with("0x")) {
cc_t value = 0;
if (parameters[idx].length() == 2) {
warnln("Invalid hexadecimal character code {}", parameters[idx]);
return {};
}
for (size_t i = 2; i < parameters[idx].length(); ++i) {
char ch = tolower(parameters[idx][i]);
if (!isdigit(ch) && !(ch >= 'a' && ch <= 'f')) {
warnln("Invalid hexadecimal character code {}", parameters[idx]);
return {};
}
value = 16 * value + (isdigit(ch)) ? (ch - '0') : (ch - 'a');
}
return value;
} else if (parameters[idx].starts_with("0")) {
cc_t value = 0;
for (size_t i = 1; i < parameters[idx].length(); ++i) {
char ch = parameters[idx][i];
if (!(ch >= '0' && ch <= '7')) {
warnln("Invalid octal character code {}", parameters[idx]);
return {};
}
value = 8 * value + (ch - '0');
}
return value;
} else if (isdigit(parameters[idx][0])) {
auto maybe_value = parameters[idx].to_uint<cc_t>();
if (!maybe_value.has_value()) {
warnln("Invalid decimal character code {}", parameters[idx]);
return {};
}
return maybe_value.value();
} else if (parameters[idx].length() == 1) {
return parameters[idx][0];
}
warnln("Invalid control character {}", parameters[idx]);
return {};
};
size_t parameter_idx = 0;
auto parse_flag_or_char = [&]() -> Result<void, int> {
if (parameters[parameter_idx][0] != '-') {
if (parameters[parameter_idx] == "min") {
auto maybe_number = parse_number(++parameter_idx);
if (!maybe_number.has_value()) {
warnln("Error parsing min: {} is not a number", parameters[parameter_idx]);
return 1;
}
return {};
} else if (parameters[parameter_idx] == "time") {
auto maybe_number = parse_number(++parameter_idx);
if (!maybe_number.has_value()) {
warnln("Error parsing time: {} is not a number", parameters[parameter_idx]);
return 1;
}
return {};
} else {
for (auto cc : control_characters) {
if (cc.name == parameters[parameter_idx]) {
if (parameter_idx == parameter_count - 1) {
warnln("No control character specified for {}", cc.name);
return 1;
}
auto maybe_control_character = parse_control_character(++parameter_idx);
if (!maybe_control_character.has_value())
return 1;
t.c_cc[cc.index] = maybe_control_character.value();
return {};
}
}
}
}
// We fall through to here if what we are setting is not a control character.
bool negate = false;
if (parameters[parameter_idx][0] == '-') {
negate = true;
parameters[parameter_idx] = parameters[parameter_idx].substring_view(1);
}
auto perform_masking = [&](tcflag_t value, tcflag_t mask, tcflag_t& dest) {
if (negate)
dest &= ~mask;
else
dest = (dest & (~mask)) | value;
};
for (auto flag : all_iflags) {
if (flag.name == parameters[parameter_idx]) {
perform_masking(flag.value, flag.mask, t.c_iflag);
return {};
}
}
for (auto flag : all_oflags) {
if (flag.name == parameters[parameter_idx]) {
perform_masking(flag.value, flag.mask, t.c_oflag);
return {};
}
}
for (auto flag : all_cflags) {
if (flag.name == parameters[parameter_idx]) {
perform_masking(flag.value, flag.mask, t.c_cflag);
return {};
}
}
for (auto flag : all_lflags) {
if (flag.name == parameters[parameter_idx]) {
perform_masking(flag.value, flag.mask, t.c_lflag);
return {};
}
}
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;
}
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