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78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/* Noncanonical Mode Example
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Copyright (C) 1991-2023 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <unistd.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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/* Use this variable to remember original terminal attributes. */
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struct termios saved_attributes;
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void
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reset_input_mode (void)
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{
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tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
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}
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void
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set_input_mode (void)
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{
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struct termios tattr;
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char *name;
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/* Make sure stdin is a terminal. */
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if (!isatty (STDIN_FILENO))
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{
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fprintf (stderr, "Not a terminal.\n");
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exit (EXIT_FAILURE);
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}
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/* Save the terminal attributes so we can restore them later. */
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tcgetattr (STDIN_FILENO, &saved_attributes);
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atexit (reset_input_mode);
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/*@group*/
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/* Set the funny terminal modes. */
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tcgetattr (STDIN_FILENO, &tattr);
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tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
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tattr.c_cc[VMIN] = 1;
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tattr.c_cc[VTIME] = 0;
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tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr);
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}
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/*@end group*/
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int
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main (void)
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{
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char c;
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set_input_mode ();
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while (1)
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{
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read (STDIN_FILENO, &c, 1);
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if (c == '\004') /* @kbd{C-d} */
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break;
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else
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putchar (c);
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}
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return EXIT_SUCCESS;
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}
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