Initial import, starting with kyle's editor.

main.c

@@ -0,0 +1,68 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+
+
+/* entry_term contains a snapshot of the termios settings at startup. */
+struct termios	entry_term;
+
+
+/*
+ * A text editor needs the terminal to be in raw mode; but the default
+ * is to be in canonical (cooked) mode, which is a buffered input mode.
+ */
+
+static void
+enable_termraw()
+{
+	struct termios	raw;
+
+	/* Read the current terminal parameters for standard input. */
+	tcgetattr(STDIN_FILENO, &raw);
+
+	/*
+	 * Turn off the local ECHO mode, which we need to do in raw mode
+	 * because what gets displayed is going to need extra control.
+	 *
+	 * NOTE(kyle): look into cfmakeraw, which will require
+	 * snapshotting.
+	 */
+	raw.c_lflag &= ~(ECHO|ICANON);
+
+	/*
+	 * Now write the terminal parameters to the current terminal,
+	 * after flushing any waiting input out.
+	 */
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
+}
+
+
+static void
+disable_termraw()
+{
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &entry_term);
+}
+
+
+int
+main()
+{
+	char	c;
+
+	/* prepare the terminal */
+	tcgetattr(STDIN_FILENO, &entry_term);
+	atexit(disable_termraw);
+	enable_termraw();
+
+	while (read(STDIN_FILENO, &c, 1) == 1 && c != 'q') {
+		if (iscntrl(c)) {
+			printf("%02x\n", c);
+		} else {
+			printf("%02x ('%c')\n", c, c);
+		}
+	}
+
+	return 0;
+}