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#scope_file
#import "Atomics";
#import "POSIX";
#import "System";
// Required to do unlocking input.
libc :: #system_library "libc";
// int poll(struct pollfd *fds, nfds_t nfds, int timeout);
pollfd :: struct {
fd : s32; // File descriptor.
events : s16; // Requested events.
revents : s16; // Returned events.
};
poll :: (fds: *pollfd, nfds: u32, timeout: s32) -> s32 #foreign libc;
// TODO Remote this.
cfmakeraw :: (termios: *Terminal_IO_Mode) -> void #foreign libc;
/* https://elixir.bootlin.com/glibc/glibc-2.28/source/termios/cfmakeraw.c#L22
void
cfmakeraw (struct termios *t)
{
t->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
t->c_oflag &= ~OPOST;
t->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
t->c_cflag &= ~(CSIZE|PARENB);
t->c_cflag |= CS8;
t->c_cc[VMIN] = 1; // read returns when one char is available.
t->c_cc[VTIME] = 0;
}
*/
// 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;
// https://codebrowser.dev/glibc/glibc/sysdeps/unix/sysv/linux/tcflush.c.html
tcflush :: (fd: s32, queue_selector: s32) -> s32 #foreign libc;
// Information for the termios.h enums is platform dependent and was retrieved from:
// https://elixir.bootlin.com/glibc/latest/source/sysdeps/unix/sysv/linux/bits/termios.h
// Set Attributes Actions.
SetAttributesActions :: enum u32 {
TCSANOW :: 0; // Change immediately.
TCSADRAIN :: 1; // Change when pending output is written.
TCSAFLUSH :: 2; // Flush pending input before changing.
}
// Input modes.
Input_Modes :: enum_flags u32 {
IGNBRK :: 0000001; // Ignore break condition.
BRKINT :: 0000002; // Signal interrupt on break.
IGNPAR :: 0000004; // Ignore characters with parity errors.
PARMRK :: 0000010; // Mark parity and framing errors.
INPCK :: 0000020; // Enable input parity check.
ISTRIP :: 0000040; // Strip 8th bit off characters.
INLCR :: 0000100; // Map NL to CR on input.
IGNCR :: 0000200; // Ignore CR.
ICRNL :: 0000400; // Map CR to NL on input.
IUCLC :: 0001000; // Translate upper case input to lower case (not in POSIX).
IXON :: 0002000; // Enable start/stop output control.
IXANY :: 0004000; // Any character will restart after stop.
IXOFF :: 0010000; // Enable start/stop input control.
IMAXBEL :: 0020000; // Ring bell when input queue is full (not in POSIX).
IUTF8 :: 0040000; // Input is UTF8 (not in POSIX).
}
// Output modes.
Output_Modes :: enum_flags u32 {
OPOST :: 0000001; // Perform output processing.
OLCUC :: 0000002; // Map lowercase characters to uppercase on output (not in POSIX).
ONLCR :: 0000004; // Map NL to CR-NL on output.
OCRNL :: 0000010; // Map CR to NL.
ONOCR :: 0000020; // Discard CR's when on column 0.
ONLRET :: 0000040; // Move to column 0 on NL.
OFILL :: 0000100; // Send fill characters for delays.
OFDEL :: 0000200; // Fill is DEL.
VTDLY :: 0040000; // Select vertical-tab delays:
VT0 :: 0000000; // Vertical-tab delay type 0.
VT1 :: 0040000; // Vertical-tab delay type 1.
}
// Control modes.
Control_Modes :: enum u32 {
CS5 :: 0000000; // 5 bits per byte.
CS6 :: 0000020; // 6 bits per byte.
CS7 :: 0000040; // 7 bits per byte.
CS8 :: 0000060; // 8 bits per byte.
CSIZE :: 0000060; // Number of bits per byte (mask).
CSTOPB :: 0000100; // Two stop bits instead of one.
CREAD :: 0000200; // Enable receiver.
PARENB :: 0000400; // Parity enable.
PARODD :: 0001000; // Odd parity instead of even.
HUPCL :: 0002000; // Hang up on last close.
CLOCAL :: 0004000;
}
// Local modes.
Local_Modes :: enum_flags u32 {
ISIG :: 0000001; // Enable signals.
ICANON :: 0000002; // Do erase and kill processing.
ECHO :: 0000010; // Enable echo.
ECHOE :: 0000020; // Visual erase for ERASE.
ECHOK :: 0000040; // Echo NL after KILL.
ECHONL :: 0000100; // Echo NL even if ECHO is off.
NOFLSH :: 0000200; // Disable flush after interrupt.
TOSTOP :: 0000400; // Send SIGTTOU for background output.
IEXTEN :: 0100000; // Enable DISCARD and LNEXT.
}
// Control Characters
Control_Chars :: enum u8 {
VINTR :: 0;
VQUIT :: 1;
VERASE :: 2;
VKILL :: 3;
VEOF :: 4;
VTIME :: 5; // Time-out value (tenths of a second) [!ICANON].
VMIN :: 6; // Minimum number of bytes read at once [!ICANON].
VSWTC :: 7;
VSTART :: 8;
VSTOP :: 9;
VSUSP :: 10;
VEOL :: 11;
VREPRINT :: 12;
VDISCARD :: 13;
VWERASE :: 14;
VLNEXT :: 15;
VEOL2 :: 16;
}
// The struct termios.
Terminal_IO_Mode :: struct {
c_iflag : Input_Modes; // Input mode flags.
c_oflag : Output_Modes; // Output mode flags.
c_cflag : Control_Modes; // Control modes flags.
c_lflag : Local_Modes; // Local modes flags.
c_line : u8; // Line discipline.
c_cc : [32]Control_Chars;// Control characters.
c_ispeed : u32; // Input speed (baud rates).
c_ospeed : u32; // Output speed (baud rates).
}
initial_tio_mode: Terminal_IO_Mode;
raw_tio_mode: Terminal_IO_Mode;
////////////////////////////////////////////////////////////////////////////////
// Resize detection
was_resized : bool;
resize_handler :: (signal_code : s32) #c_call {
new_context : Context;
push_context new_context {
print("SIGNAL:%", signal_code);
if signal_code != SIGWINCH then return;
atomic_swap(*was_resized, true);
}
}
prepare_resize_handler :: () {
sa : sigaction_t;
sa.sa_handler = resize_handler;
sigemptyset(*(sa.sa_mask));
sa.sa_flags = SA_RESTART;
sigaction(SIGWINCH, *sa, null);
}
restore_resize_handler :: () {
sa : sigaction_t;
sa.sa_handler = SIG_DFL;
sigaction(SIGWINCH, null, *sa);
}
////////////////////////////////////////////////////////////////////////////////
#scope_export
OS_flush_input :: inline () {
TCIFLUSH :: 0; // TODO Is this always zero in all systems?
tcflush(STDIN_FILENO, TCIFLUSH);
}
OS_prepare_terminal :: () {
tcgetattr(STDIN_FILENO, *initial_tio_mode); // TODO Log on error.
raw_tio_mode = initial_tio_mode;
raw_tio_mode.c_iflag &= ~(.IGNBRK | .BRKINT | .PARMRK | .ISTRIP | .INLCR | .IGNCR | .ICRNL | .IXON);
raw_tio_mode.c_oflag &= ~(.OPOST);
raw_tio_mode.c_lflag &= ~(.ECHO | .ECHONL | .ICANON | .ISIG | .IEXTEN);
raw_tio_mode.c_cflag &= ~(.CSIZE | .PARENB);
raw_tio_mode.c_cflag |= .CS8;
raw_tio_mode.c_cc[Control_Chars.VMIN] = 1;
raw_tio_mode.c_cc[Control_Chars.VTIME] = 0;
tcsetattr(STDIN_FILENO, 0, *raw_tio_mode); // TODO Log on error.
was_resized = false;
prepare_resize_handler();
}
OS_reset_terminal :: () {
restore_resize_handler();
tcsetattr(STDIN_FILENO, 0, *initial_tio_mode); // TODO Log on 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;
}
OS_wait_for_input :: (timeout_milliseconds: s32) -> is_input_available: bool {
fds := pollfd.[ .{ fd = STDIN_FILENO, events = POLLIN, revents = 0 } ];
nfds := fds.count;
poll_return := poll(fds.data, xx nfds, xx timeout_milliseconds); // TODO Wait for input using poll syscall. This breaks and throws '-1 | 4 | Interrupted system call' when we resize the window while polling.
error_code, error_message := get_error_value_and_string(); // FIXME Not used.
return ifx poll_return > 0 then true else false;
}
// TODO This procedure hides the behaviour of reseting on read.
// We should have the `was_resized` on module.jai so that we know it may be used in another thread.
OS_was_terminal_resized :: () -> bool {
return atomic_swap(*was_resized, false); // TODO If the windows implementation is similar, we may push this into the main module file.
}
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