71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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#include "util.h"
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static struct termios entry_term;
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/*
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* A text editor needs the terminal to be in raw mode; but the default
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* is to be in canonical (cooked) mode, which is a buffered input mode.
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*/
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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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* Put the terminal into raw mode.
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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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static void
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disable_termraw()
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{
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &entry_term) == -1) {
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die("couldn't disable terminal raw mode");
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}
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}
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void
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setup_terminal()
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{
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if (tcgetattr(STDIN_FILENO, &entry_term) == -1) {
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die("can't snapshot terminal settings");
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}
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atexit(disable_termraw);
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enable_termraw();
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}
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