Make dinput8 behaviour more correct for mouse and keyboard.
Fix small bug when keyboard buffer overflows.
Use DI_OK instead of 0 for returned values.

diff --git a/include/dinput.h b/include/dinput.h
index d93de95..b9e71cd 100644
--- a/include/dinput.h
+++ b/include/dinput.h
@@ -191,6 +191,25 @@
 #define DIDEVTYPE_JOYSTICK              4
 #define DIDEVTYPE_HID                   0x00010000
 
+#define DI8DEVCLASS_ALL             0
+#define DI8DEVCLASS_DEVICE          1
+#define DI8DEVCLASS_POINTER         2
+#define DI8DEVCLASS_KEYBOARD        3
+#define DI8DEVCLASS_GAMECTRL        4
+
+#define DI8DEVTYPE_DEVICE           0x11
+#define DI8DEVTYPE_MOUSE            0x12
+#define DI8DEVTYPE_KEYBOARD         0x13
+#define DI8DEVTYPE_JOYSTICK         0x14
+#define DI8DEVTYPE_GAMEPAD          0x15
+#define DI8DEVTYPE_DRIVING          0x16
+#define DI8DEVTYPE_FLIGHT           0x17
+#define DI8DEVTYPE_1STPERSON        0x18
+#define DI8DEVTYPE_DEVICECTRL       0x19
+#define DI8DEVTYPE_SCREENPOINTER    0x1A
+#define DI8DEVTYPE_REMOTE           0x1B
+#define DI8DEVTYPE_SUPPLEMENTAL     0x1C
+	
 #define DIDEVTYPEMOUSE_UNKNOWN          1
 #define DIDEVTYPEMOUSE_TRADITIONAL      2
 #define DIDEVTYPEMOUSE_FINGERSTICK      3
@@ -219,6 +238,76 @@
 #define DIDEVTYPEJOYSTICK_WHEEL         6
 #define DIDEVTYPEJOYSTICK_HEADTRACKER   7
 
+#define DI8DEVTYPEMOUSE_UNKNOWN                     1
+#define DI8DEVTYPEMOUSE_TRADITIONAL                 2
+#define DI8DEVTYPEMOUSE_FINGERSTICK                 3
+#define DI8DEVTYPEMOUSE_TOUCHPAD                    4
+#define DI8DEVTYPEMOUSE_TRACKBALL                   5
+#define DI8DEVTYPEMOUSE_ABSOLUTE                    6
+
+#define DI8DEVTYPEKEYBOARD_UNKNOWN                  0
+#define DI8DEVTYPEKEYBOARD_PCXT                     1
+#define DI8DEVTYPEKEYBOARD_OLIVETTI                 2
+#define DI8DEVTYPEKEYBOARD_PCAT                     3
+#define DI8DEVTYPEKEYBOARD_PCENH                    4
+#define DI8DEVTYPEKEYBOARD_NOKIA1050                5
+#define DI8DEVTYPEKEYBOARD_NOKIA9140                6
+#define DI8DEVTYPEKEYBOARD_NEC98                    7
+#define DI8DEVTYPEKEYBOARD_NEC98LAPTOP              8
+#define DI8DEVTYPEKEYBOARD_NEC98106                 9
+#define DI8DEVTYPEKEYBOARD_JAPAN106                10
+#define DI8DEVTYPEKEYBOARD_JAPANAX                 11
+#define DI8DEVTYPEKEYBOARD_J3100                   12
+
+#define DI8DEVTYPE_LIMITEDGAMESUBTYPE               1
+
+#define DI8DEVTYPEJOYSTICK_LIMITED                  DI8DEVTYPE_LIMITEDGAMESUBTYPE
+#define DI8DEVTYPEJOYSTICK_STANDARD                 2
+
+#define DI8DEVTYPEGAMEPAD_LIMITED                   DI8DEVTYPE_LIMITEDGAMESUBTYPE
+#define DI8DEVTYPEGAMEPAD_STANDARD                  2
+#define DI8DEVTYPEGAMEPAD_TILT                      3
+
+#define DI8DEVTYPEDRIVING_LIMITED                   DI8DEVTYPE_LIMITEDGAMESUBTYPE
+#define DI8DEVTYPEDRIVING_COMBINEDPEDALS            2
+#define DI8DEVTYPEDRIVING_DUALPEDALS                3
+#define DI8DEVTYPEDRIVING_THREEPEDALS               4
+#define DI8DEVTYPEDRIVING_HANDHELD                  5
+
+#define DI8DEVTYPEFLIGHT_LIMITED                    DI8DEVTYPE_LIMITEDGAMESUBTYPE
+#define DI8DEVTYPEFLIGHT_STICK                      2
+#define DI8DEVTYPEFLIGHT_YOKE                       3
+#define DI8DEVTYPEFLIGHT_RC                         4
+
+#define DI8DEVTYPE1STPERSON_LIMITED                 DI8DEVTYPE_LIMITEDGAMESUBTYPE
+#define DI8DEVTYPE1STPERSON_UNKNOWN                 2
+#define DI8DEVTYPE1STPERSON_SIXDOF                  3
+#define DI8DEVTYPE1STPERSON_SHOOTER                 4
+
+#define DI8DEVTYPESCREENPTR_UNKNOWN                 2
+#define DI8DEVTYPESCREENPTR_LIGHTGUN                3
+#define DI8DEVTYPESCREENPTR_LIGHTPEN                4
+#define DI8DEVTYPESCREENPTR_TOUCH                   5
+
+#define DI8DEVTYPEREMOTE_UNKNOWN                    2
+
+#define DI8DEVTYPEDEVICECTRL_UNKNOWN                2
+#define DI8DEVTYPEDEVICECTRL_COMMSSELECTION         3
+#define DI8DEVTYPEDEVICECTRL_COMMSSELECTION_HARDWIRED 4
+
+#define DI8DEVTYPESUPPLEMENTAL_UNKNOWN              2
+#define DI8DEVTYPESUPPLEMENTAL_2NDHANDCONTROLLER    3
+#define DI8DEVTYPESUPPLEMENTAL_HEADTRACKER          4
+#define DI8DEVTYPESUPPLEMENTAL_HANDTRACKER          5
+#define DI8DEVTYPESUPPLEMENTAL_SHIFTSTICKGATE       6
+#define DI8DEVTYPESUPPLEMENTAL_SHIFTER              7
+#define DI8DEVTYPESUPPLEMENTAL_THROTTLE             8
+#define DI8DEVTYPESUPPLEMENTAL_SPLITTHROTTLE        9
+#define DI8DEVTYPESUPPLEMENTAL_COMBINEDPEDALS      10
+#define DI8DEVTYPESUPPLEMENTAL_DUALPEDALS          11
+#define DI8DEVTYPESUPPLEMENTAL_THREEPEDALS         12
+#define DI8DEVTYPESUPPLEMENTAL_RUDDERPEDALS        13
+	
 #define GET_DIDEVICE_TYPE(dwDevType)     LOBYTE(dwDevType)
 #define GET_DIDEVICE_SUBTYPE(dwDevType)  HIBYTE(dwDevType)