87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*** Include section ***/
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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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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/*** Data section ***/
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struct termios orig_termios;
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/*** Terminal section ***/
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void die(const char* s) {
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// perror looks for global errno variable and then prints
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// a descriptive error mesage for it.
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perror(s);
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exit(1);
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}
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void disableRawMode() {
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1)
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die("Failed to disable raw mode");
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}
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void enableRawMode() {
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// Save original terminal state into orig_termios.
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if (tcgetattr(STDIN_FILENO, &orig_termios) == -1)
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die("Failed to get current terminal state");
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// At exit, restore the original state.
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atexit(disableRawMode);
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// Modify the original state to enter in raw mode.
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struct termios raw = orig_termios;
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// This disables Ctrl-M, Ctrl-S and Ctrl-Q commands.
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// (BRKINT, INPCK and ISTRIP are not estrictly mandatory,
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// but it is recommended to turn them off in case any
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// system needs it).
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raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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// Turning off all output processing (\r\n).
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raw.c_oflag &= ~(OPOST);
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// Setting character size to 8 bits per byte (it should be
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// like that on most systems, but whatever).
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raw.c_cflag |= (CS8);
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// Using NOT operator on ECHO | ICANON | IEXTEN | ISIG and
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// then bitwise-AND them with flags field in order to
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// force c_lflag 4th bit to become 0. This disables
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// chars being printed (ECHO) and let us turn off
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// canonical mode in order to read input byte-by-byte
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// instead of line-by-line (ICANON), ISIG disables
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// Ctrl-C command and IEXTEN the Ctrl-V one.
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raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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// read() function now returns as soon as there is any
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// input to be read.
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raw.c_cc[VMIN] = 0;
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// Forcing read() function to return every 1/10 of a
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// second if there is nothing to read.
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raw.c_cc[VTIME] = 1;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
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die("Failed to set raw mode");
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}
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/*** Init section ***/
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int main() {
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enableRawMode();
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while (1) {
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char c = '\0';
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// Ignoring EAGAIN to make it work on Cygwin.
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if (read(STDIN_FILENO, &c, 1) == -1 && errno != EAGAIN)
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die("Error reading input");
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if (isprint(c))
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printf("%d ('%c')\r\n", c, c);
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else
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printf("%d\n\r", c);
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if (c == 'q')
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break;
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}
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return 0;
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} |