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#import "POSIX";
__term : My_Termios;
My_Termios :: 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).
}
// 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 : *My_Termios) -> s32 #foreign libc;
// https://codebrowser.dev/glibc/glibc/sysdeps/unix/sysv/linux/tcgetattr.c.html
tcgetattr :: (fd : s32, termios_p : *My_Termios) -> s32 #foreign libc;
OS_prepare_terminal :: () {
// TODO Required to do unlocking input.
tcgetattr(STDIN_FILENO, *__term);
term_new := __term;
term_new.c_iflag &= 0xFFFFFA14;// ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
term_new.c_oflag &= 0xFFFFFFFE;// ~OPOST;
term_new.c_lflag &= 0xFFFF7FB4;// ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
term_new.c_cflag &= 0xFFFFFECF;// ~(CSIZE | PARENB);
term_new.c_cflag |= 0x00000030; // TODO WHAT IS THIS?
tcsetattr(STDIN_FILENO, 0, *term_new);
}
OS_reset_terminal :: () {
tcsetattr(STDIN_FILENO, 0, *__term); // return echo
}
OS_get_terminal_size :: () -> rows: int, columns: int {
buffer: [512] u8;
write_string(Commands.QueryWindowSizeInChars);
bytes_read := read(STDIN_FILENO, buffer.data, buffer.count-1);
str := to_string(buffer.data, bytes_read);
// Result: [8;79;156t
assert(
buffer.data[0] == #char "\e" &&
buffer.data[1] == #char "[" &&
buffer.data[2] == #char "8",
"Query windows size in chars returned invalid response.");
parts := split(str, ";");
rows := parse_int(*parts[1]);
columns := parse_int(*parts[2]);
return rows, columns;
}
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