92 lines
2.3 KiB
Plaintext
92 lines
2.3 KiB
Plaintext
static void
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enable_termraw()
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{
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struct termios raw;
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/* Read the current terminal parameters for standard input. */
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if (tcgetattr(STDIN_FILENO, &raw) == -1) {
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die("tcgetattr while enabling raw mode");
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}
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/*
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* Turn off software flow control. IXON: disable flow control,
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* so named because XON and XOFF :)
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*
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* ICRNL: Don't interpret carriage returns as newlines.
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*
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* raw.c_iflag &= ~(ICRNL|IXON|BRKINT|INPCK|ISTRIP);
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*/
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/*
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* Turn off the terminal's conversion of newlines -> carriage
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* return + newline.
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*
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* raw.c_oflag &= ~(OPOST);
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*/
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/*
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* Turn off the local ECHO mode, which we need to do in raw mode
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* because what gets displayed is going to need extra control.
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*
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* ICANON: Turn off canonical mode.
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*
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* ISIG: Turn off SIGINT / SIGSTP processing.
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*
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* IEXTEN: turn off ^v processing.
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*
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* NOTE(kyle): look into cfmakeraw, which will require
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* snapshotting. However, this skips all the notes about what
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* it takes to put the terminal in raw mode.
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*
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* raw.c_lflag &= ~(ECHO|ICANON|ISIG|IEXTEN);
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*/
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/*
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* The following are probably not really needed on modern
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* terminals, but it's fashionable to do as much.
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*
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* BRKINT: break conditions trigger SIGINT.
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*
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* INPCK: parity checking, which might be useful over serial
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* terminals?
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*
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* ISTRIP strips the high bit.
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*
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* CS: set character size to 8-bit.
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* raw.c_iflag &= ~(BRKINT | INPCK | ISTRIP);
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*
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* NOTE(kyle): I had this set here, but then it turns out
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* that it fuckled my terminal.
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* raw.c_cflag |= CS8;
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*/
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/*
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* Switched over to cfmakeraw.
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*/
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cfmakeraw(&raw);
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/*
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* Set timeout for read(2).
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*
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* VMIN: what is the minimum number of bytes required for read
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* to return?
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*
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* VTIME: max time before read(2) returns in hundreds of milli-
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* seconds.
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*/
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raw.c_cc[VMIN] = 0;
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raw.c_cc[VTIME] = 1;
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/*
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* Now write the terminal parameters to the current terminal,
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* after flushing any waiting input out.
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*/
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
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die("tcsetattr while enabling raw mode");
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}
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}
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So this is a really long line; it should overflow the buffer and it's helpful for doing things like testing horizontal scrolling. Furthermore, it's at least twice as long as the line is likely to be, so there's more opportunity to test whether scrolling works correctly.
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But this line is nominal.
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