1 files changed, 74 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/SNIP/joystick.c b/reference/C/CONTRIB/SNIP/joystick.c
new file mode 100755
index 0000000..4eca117
--- /dev/null
+++ b/reference/C/CONTRIB/SNIP/joystick.c
@@ -0,0 +1,74 @@
+/*
+**  JOYSTICK.H
+**
+**  Joystick support functions
+**
+**  Public domain demo by Bob Stout
+*/
+
+typedef enum {ERROR = -1, FALSE, TRUE} LOGICAL;
+
+#define BOOL(x) (!(!(x)))
+#define SUCCESS 0
+
+struct joystick {
+        LOGICAL switch_0;
+        LOGICAL switch_1;
+        LOGICAL switch_2;
+        LOGICAL switch_3;
+
+        int     pos_Ax;
+        int     pos_Ay;
+        int     pos_Bx;
+        int     pos_By;
+};
+
+LOGICAL read_joystick(void);
+
+/*
+**  JOYSTICK.C
+**
+**  Joystick support functions
+**
+**  Public domain demo by Bob Stout
+*/
+
+#include <dos.h>
+#include "joystick.h"
+
+struct joystick JoyStick;
+
+/*
+**  read_joystick()
+**
+**  returns SUCCESS or ERROR
+**
+**  fills in global JoyStick structure
+*/
+
+LOGICAL read_joystick(void)
+{
+        union REGS regs;
+
+        regs.h.ah = 0x84;                       /* Read the switches    */
+        regs.x.dx = 0;
+        int86(0x15, &regs, &regs);
+        if (regs.x.cflag)
+                return ERROR;
+        JoyStick.switch_0 = BOOL(regs.h.al & 0x10);
+        JoyStick.switch_1 = BOOL(regs.h.al & 0x20);
+        JoyStick.switch_2 = BOOL(regs.h.al & 0x40);
+        JoyStick.switch_3 = BOOL(regs.h.al & 0x80);
+
+        regs.h.ah = 0x84;                       /* Read positions       */
+        regs.x.dx = 1;
+        int86(0x15, &regs, &regs);
+        if (regs.x.cflag)
+                return ERROR;
+        JoyStick.pos_Ax = regs.x.ax;
+        JoyStick.pos_Ay = regs.x.bx;
+        JoyStick.pos_Bx = regs.x.cx;
+        JoyStick.pos_By = regs.x.dx;
+
+        return SUCCESS;
+}