A-M baby

Task/Keyboard-input-Flush-the-keyboard-buffer/C/keyboard-input-flush-the-keyboard-buffer.c

@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdio.h>
+#include <termios.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+
+void set_mode(int want_key)
+{
+	static struct termios old, new;
+	if (!want_key) {
+		tcsetattr(STDIN_FILENO, TCSANOW, &old);
+		return;
+	}
+
+	tcgetattr(STDIN_FILENO, &old);
+	new = old;
+	new.c_lflag &= ~(ICANON);
+	tcsetattr(STDIN_FILENO, TCSANOW, &new);
+}
+
+int get_key()
+{
+	int c = 0;
+	fd_set fs;
+
+	FD_ZERO(&fs);
+	FD_SET(STDIN_FILENO, &fs);
+	select(STDIN_FILENO + 1, &fs, 0, 0, 0);
+
+	if (FD_ISSET(STDIN_FILENO, &fs)) {
+		c = getchar();
+		set_mode(0);
+	}
+	return c;
+}
+
+int main()
+{
+	int c = 0;
+	while (c != 'n') {
+		set_mode(1);
+
+		/* flush pending input so we won't format the hardrive
+		   because user accidentally typed 'y' before we even prompted */
+		tcflush(STDIN_FILENO, TCIFLUSH);
+
+		printf("Show this prompt again [Yes/No/Ignore you]? ");
+		fflush(stdout);
+
+		switch(c = tolower(get_key())) {
+		case 'y':	putchar('\n');
+				break;
+
+		case 'n':	printf("\nDone\n");
+				break;
+
+		case 'i':	puts("\nI'll ignore keys for 5 seconds");
+				sleep(5);
+				putchar('\n');
+				break;
+		default:
+				puts("\nAssume that was the cat.");
+		}
+	}
+
+	return 0;
+}