keyboard_ucallback - User specified unicode keyboard callback handler. Allegro game programming library.

       Unicode-aware  version of keyboard_callback(). If set, this function is called by the keyboard handler in
       response to every keypress. It is passed the character value and scancode that are about to be added into
       the input buffer, can modify the scancode value, and returns a new or modified key code. If it both  sets
       the  scancode  to  zero  and  returns  zero,  the  keypress  will be ignored. This routine executes in an
       interrupt context, so it must be in locked memory. Example:

          int silence_g_key(int key, int *scancode)
          {
             if (key == 'g') {
                *scancode = 0;
                return 0;
             }
             return key;
          } END_OF_FUNCTION(silence_g_key)

          ...

             install_timer();
             LOCK_FUNCTION(silence_g_key);
             install_keyboard();
             keyboard_ucallback = silence_g_key;

       Note that this keyboard callback has priority over the non unicode callback. If you set  both,  only  the
       unicode one will work.

       keyboard_ucallback - User specified unicode keyboard callback handler. Allegro game programming library.

install_keyboard(3alleg4),      readkey(3alleg4),      ureadkey(3alleg4),     keyboard_callback(3alleg4),
       keyboard_lowlevel_callback(3alleg4)

Allegro                                           version 4.4.3                      keyboard_ucallback(3alleg4)

#include<allegro.h>externint(*keyboard_ucallback)(intkey,int*scancode);