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#scope_file
#import "POSIX";
#import "System";
// Required to do unlocking input.
libc :: #system_library "libc";
// https://codebrowser.dev/glibc/glibc/sysdeps/unix/sysv/linux/tcsetattr.c.html
tcsetattr :: (fd : s32, optional_actions : s32, termios_p : *Terminal_IO_Mode) -> s32 #foreign libc;
// https://codebrowser.dev/glibc/glibc/sysdeps/unix/sysv/linux/tcgetattr.c.html
tcgetattr :: (fd : s32, termios_p : *Terminal_IO_Mode) -> s32 #foreign libc;
// Input modes.
Input_Modes :: enum_flags u32 {
IGNBRK; // Ignore break condition.
BRKINT; // Signal interrupt on break.
IGNPAR; // Ignore characters with parity errors.
PARMRK; // Mark parity and framing errors.
INPCK; // Enable input parity check.
ISTRIP; // Strip 8th bit off characters.
INLCR; // Map NL to CR on input.
IGNCR; // Ignore CR.
ICRNL; // Map CR to NL on input.
IXON; // Enable start/stop output control.
IXOFF; // Enable start/stop input control.
IXANY; // Any character will restart after stop.
__NOT_USED__;
IMAXBEL; // Ring bell when input queue is full.
IUCLC; // Translate upper case input to lower case.
}
// Local modes.
Local_Modes :: enum_flags u32 {
ECHOKE; // Visual erase for KILL.
ECHOE; // Visual erase for ERASE.
ECHOK; // Echo NL after KILL.
ECHO; // Enable echo.
ECHONL; // Echo NL even if ECHO is off.
ECHOPRT; // Hardcopy visual erase.
ECHOCTL; // Echo control characters as ^X.
ISIG; // Enable signals.
ICANON; // Do erase and kill processing.
ALTWERASE; // Alternate WERASE algorithm.
IEXTEN; // Enable DISCARD and LNEXT.
EXTPROC; // External processing.
TOSTOP; // Send SIGTTOU for background output.
FLUSHO; // Output being flushed (state).
XCASE; // Canonical upper/lower case.
NOKERNINFO; // Disable VSTATUS.
PENDIN; // Retype pending input (state).
NOFLSH; // Disable flush after interrupt.
}
Terminal_IO_Mode :: struct {
c_iflag : u32; // Input mode flags.
c_oflag : u32; // Output mode flags.
c_cflag : u32; // Control modes flags.
c_lflag : u32; // Local modes flags.
c_line : u8; // Line discipline.
c_cc : [32]u8; // Control characters.
c_ispeed : u32; // Input speed (baud rates).
c_ospeed : u32; // Output speed (baud rates).
}
initial_tio_mode : Terminal_IO_Mode;
default_tio_mode: Terminal_IO_Mode;
blocking_tio_mode: Terminal_IO_Mode;
unblocking_tio_mode: Terminal_IO_Mode;
#scope_export
OS_prepare_terminal :: () {
// TODO Required to do unlocking input.
tcgetattr(STDIN_FILENO, *initial_tio_mode);
default_tio_mode := initial_tio_mode;
default_tio_mode.c_iflag &= 0xFFFFFA14;// ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
default_tio_mode.c_oflag &= 0xFFFFFFFE;// ~OPOST;
default_tio_mode.c_lflag &= 0xFFFF7FB4;// ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
default_tio_mode.c_cflag &= 0xFFFFFECF;// ~(CSIZE | PARENB);
default_tio_mode.c_cflag |= 0x00000030; // TODO WHAT IS THIS?
blocking_tio_mode = default_tio_mode;
blocking_tio_mode.c_iflag |= xx cast(Input_Modes)(.IXOFF | .ICRNL);
blocking_tio_mode.c_lflag |= xx cast(Local_Modes)(.NOKERNINFO | .ECHO | .ECHOE | .ECHOKE);
unblocking_tio_mode = default_tio_mode;
iflags: Input_Modes = (.IGNBRK | .BRKINT | .PARMRK | .ISTRIP | .INLCR | .IGNCR | .ICRNL | .IXON);
unblocking_tio_mode.c_iflag &= xx ~(iflags);
lflags: Local_Modes = (.ECHO | .ECHONL | .ICANON | .IEXTEN);
unblocking_tio_mode.c_lflag &= xx ~lflags;
tcsetattr(STDIN_FILENO, 0, *default_tio_mode);
}
OS_reset_terminal :: () {
tcsetattr(STDIN_FILENO, 0, *initial_tio_mode); // return echo
}
OS_get_terminal_size :: () -> rows: int, columns: int {
auto_release_temp();
input := talloc_string(64);
write_string(Commands.QueryWindowSizeInChars);
input.count = OS_read_input(input.data, input.count);
// Expected message format: [8;<r>;<c>t
// where <r> is the number of rows and <c> of columns.
assert(
input[0] == #char "\e" &&
input[1] == #char "[" &&
input[2] == #char "8",
"Query windows size in chars returned invalid response.");
parts := split(input, ";");
rows := parse_int(*parts[1]);
columns := parse_int(*parts[2]);
return rows, columns;
}
// TODO Maybe we should use a NON-BLOCKING state by default... and only change to blocking when performing a HUMAN read...?
OS_set_input_mode :: (mode: Input_Mode) {
if mode == {
case .HUMAN;
tcsetattr(STDIN_FILENO, 0, *blocking_tio_mode);
// TODO get_error_value_and_string :: () -> (error_code: OS_Error_Code, description: string)
case .MACHINE;
tcsetattr(STDIN_FILENO, 0, *unblocking_tio_mode);
// TODO get_error_value_and_string :: () -> (error_code: OS_Error_Code, description: string)
case;
// TODO ERROR
}
}
OS_read_input :: (buffer: *u8, bytes_to_read: s64) -> bytes_read: s64, error: bool = false, error_message: string = "" {
bytes_read := read(STDIN_FILENO, buffer, xx bytes_to_read);
if bytes_read < 0 {
error_code, error_message := get_error_value_and_string();
return -1, true, error_message;
}
return bytes_read;
}
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