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105 lines
2.0 KiB
C
105 lines
2.0 KiB
C
/* Extremely inefficient but portable POSIX getch() */
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#include <stdio.h>
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#include <string.h>
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#include <termios.h> /* for tcgetattr() and tcsetattr() */
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#include <unistd.h> /* for read() */
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "getch.h"
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#ifndef STDIN_FILENO
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# define STDIN_FILENO 0
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#endif
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int
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getch (void)
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{
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struct termios save_termios;
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struct termios ios;
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unsigned char b;
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int c = 0;
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if (!isatty (STDIN_FILENO))
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return EOF;
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if (tcgetattr (STDIN_FILENO, &save_termios) < 0)
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return EOF;
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ios = save_termios;
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ios.c_lflag &= ~(ICANON | ECHO | ISIG);
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ios.c_cc[VMIN] = 1; /* read() will return with one char */
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ios.c_cc[VTIME] = 0; /* read() blocks forever */
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if (tcsetattr (STDIN_FILENO, TCSANOW, &ios) < 0)
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return EOF;
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if (read (STDIN_FILENO, &b, 1) == 1)
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c = (int)(0xff & b);
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else
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c = EOF;
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tcsetattr (STDIN_FILENO, TCSANOW, &save_termios);
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return c;
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}
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int
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kbhit (void)
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{
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struct termios save_termios;
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struct termios ios;
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fd_set inp;
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struct timeval timeout = {0, 0};
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int result;
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if (!isatty (STDIN_FILENO))
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return 0;
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if (tcgetattr (STDIN_FILENO, &save_termios) < 0)
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return 0;
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ios = save_termios;
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ios.c_lflag &= ~(ICANON | ECHO | ISIG);
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ios.c_cc[VMIN] = 1; /* read() will return with one char */
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ios.c_cc[VTIME] = 0; /* read() blocks forever */
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if (tcsetattr (STDIN_FILENO, TCSANOW, &ios) < 0)
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return 0;
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/* set up select() args */
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FD_ZERO(&inp);
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FD_SET(STDIN_FILENO, &inp);
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result = select (STDIN_FILENO+1, &inp, NULL, NULL, &timeout) == 1;
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tcsetattr (STDIN_FILENO, TCSANOW, &save_termios);
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return result;
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}
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#if defined TEST_GETCH
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int
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main ()
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{
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int i;
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char c[4];
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printf("Enter %d keys to continue: ", sizeof c - 1);
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fflush (stdout);
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memset(c, 0, sizeof c);
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for (i=0; i<sizeof c - 1; i++)
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c[i] = getch ();
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printf("Your input: [%s]\n", c);
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printf("Now hit any key to abort: ");
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while (!kbhit())
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printf(".");
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return 0;
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}
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#endif
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