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85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
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/*****************************************************************************
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kbhit() and getch() for Linux/UNIX
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Chris Giese <geezer@execpc.com> http://my.execpc.com/~geezer
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Release date: ?
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This code is public domain (no copyright).
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You can do whatever you want with it.
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*****************************************************************************/
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#if !defined(linux)
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#include <conio.h> /* kbhit(), getch() */
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#else
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#include <sys/time.h> /* struct timeval, select() */
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/* ICANON, ECHO, TCSANOW, struct termios */
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#include <termios.h> /* tcgetattr(), tcsetattr() */
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#include <stdlib.h> /* atexit(), exit() */
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#include <unistd.h> /* read() */
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#include <stdio.h> /* printf() */
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#include <string.h> /* memcpy */
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static struct termios g_old_kbd_mode;
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/*****************************************************************************
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*****************************************************************************/
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static void cooked(void)
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{
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tcsetattr(0, TCSANOW, &g_old_kbd_mode);
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}
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/*****************************************************************************
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*****************************************************************************/
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static void raw(void)
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{
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static char init;
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/**/
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struct termios new_kbd_mode;
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if(init)
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return;
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/* put keyboard (stdin, actually) in raw, unbuffered mode */
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tcgetattr(0, &g_old_kbd_mode);
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memcpy(&new_kbd_mode, &g_old_kbd_mode, sizeof(struct termios));
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new_kbd_mode.c_lflag &= ~(ICANON | ECHO);
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new_kbd_mode.c_cc[VTIME] = 0;
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new_kbd_mode.c_cc[VMIN] = 1;
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tcsetattr(0, TCSANOW, &new_kbd_mode);
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/* when we exit, go back to normal, "cooked" mode */
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atexit(cooked);
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init = 1;
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}
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/*****************************************************************************
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*****************************************************************************/
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static int kbhit(void)
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{
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struct timeval timeout;
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fd_set read_handles;
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int status;
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raw();
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/* check stdin (fd 0) for activity */
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FD_ZERO(&read_handles);
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FD_SET(0, &read_handles);
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timeout.tv_sec = timeout.tv_usec = 0;
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status = select(0 + 1, &read_handles, NULL, NULL, &timeout);
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if(status < 0)
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{
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printf("select() failed in kbhit()\n");
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exit(1);
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}
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return status;
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}
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/*****************************************************************************
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*****************************************************************************/
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static int getch(void)
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{
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unsigned char temp;
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raw();
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/* stdin = fd 0 */
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if(read(0, &temp, 1) != 1)
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return 0;
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return temp;
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}
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#endif
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