Make termios options process-wise instead of global. Write ps2 drivers, but keep translation between scancode set 2/3 to set 1 enabled.

programs/CMakeLists.txt

@@ -67,6 +67,7 @@ set(PROGRAMS
     ipcs.c
     sleep.c
     man.c
+    edit.c
 )
 foreach(PROGRAM ${PROGRAMS})
     # Prepare the program name.

programs/edit.c

@@ -0,0 +1,48 @@
+#include <sys/unistd.h>
+#include <termios.h>
+#include <stdbool.h>
+#include <debug.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#define CTRL_KEY(k) ((k)&0x1f)
+
+static struct termios _original_termios, _termios;
+
+static inline void die(const char *s)
+{
+    printf("error: %s\n", s);
+    exit(1);
+}
+
+static inline void disable_raw_mode()
+{
+    tcsetattr(STDIN_FILENO, 0, &_original_termios);
+}
+
+static inline void enable_raw_mode()
+{
+    tcgetattr(STDIN_FILENO, &_original_termios);
+    _termios = _original_termios;
+    _termios.c_lflag &= ~(ICANON | ECHO | IEXTEN | ISIG);
+    tcsetattr(STDIN_FILENO, 0, &_termios);
+}
+
+int main(int argc, char *argv[])
+{
+    enable_raw_mode();
+
+    int c;
+    do {
+        c = getchar();
+        if (iscntrl(c)) {
+            printf("%d\n", c);
+        } else {
+            printf("%d ('%c')\n", c, c);
+        }
+    } while (c != 'q');
+
+    disable_raw_mode();
+
+    return 0;
+}