//-------------
//  tsr_prep.h
//  (c) Victor A.Voilevitch, 1994-1996.
//-------------

#ifndef Ok
#define Ok 1
#define Yes 1
#define No 0
#endif

#ifndef __TSR_PREPARE__
#define __TSR_PREPARE__

#include <time.h>

#ifdef __cplusplus
    #define __ARGS ...
#else
    #define __ARGS
#endif

#define __FULL_ARGS  unsigned bp, unsigned di, unsigned si,        \
                     unsigned ds, unsigned es,                     \
                     unsigned dx, unsigned cx,                     \
                     unsigned bx, unsigned out_ax,                 \
                     unsigned ip, unsigned cs, unsigned out_flags


//---------------------------------------------------
// stack and heap limits    
// (for Borland C++ compiler, 
// for other compilers must be otherwise)
//---------------------------------------------------
#define TSR_PREPARE() extern unsigned _heaplen = 1024; \
                      extern unsigned _stklen  = 512;


//---------------------------------------------------
// program ID (for INT 2F)
//---------------------------------------------------
extern char PROGRAM_ID;


//---------------------------------------------------
// program work function     
//---------------------------------------------------
typedef int (*FUNCTION)(void);
extern FUNCTION WORK_FUNCTION;


//---------------------------------------------------
// program unload function     
//---------------------------------------------------
void UNLOAD_FUNCTION(void);
extern FUNCTION USER_UNLOAD_FUNCTION;
const unsigned long WAIT_UNLOAD = CLK_TCK * 1;

//---------------------------------------------------
// TSR interrrupt handler stack,
// SS,SP values for handler's work
//---------------------------------------------------
const STACK_LEN = 1024;
extern unsigned char far TSR_stack[];
extern unsigned TSR_ss;
extern unsigned TSR_sp;

//---------------------------------------------------
// SS and SP of background program by enter into interrupt handler
// PID of background program
//---------------------------------------------------
extern unsigned old_ss, old_sp;
extern unsigned old_PSP;


//---------------------------------------------------
// DTA of tsr and background programs
//---------------------------------------------------
extern char far * old_DTA;
extern char far * TSR_DTA;

//---------------------------------------------------
// MS DOS reenterable flag address
//---------------------------------------------------
extern char far * inside_DOS;

//---------------------------------------------------
//  flags
//---------------------------------------------------
extern char FLAG_TIMER_DONE;
extern char FLAG_KEY_PRESSED;
//------------------------
extern char FLAG_WORKING;
extern char FLAG_UNLOADING;
//------------------------
extern char FLAG_START;
extern int  FLAG_TO_UNLOAD;
//------------------------
extern char FLAG_INSIDE_09;
extern int  FLAG_HOT_KEY_SCAN;
extern int  FLAG_HOT_KEY_SHIFT;
//------------------------
extern char FLAG_INSIDE_1C;
extern unsigned long DELTA_TIME;
//------------------------
extern char FLAG_REPLACE_28;
extern char FLAG_INSIDE_28;
//------------------------
extern char FLAG_REPLACE_13;
extern char FLAG_INSIDE_13;

//---------------------------------------------------
//  control keys status
//---------------------------------------------------
enum KBD_STATUS
{ R_SHIFT    = 0x01,      //  Right Shift pressed
  L_SHIFT    = 0x02,      //  Left Shift pressed
  CTRL       = 0x04,      //  Ctrl pressed
  ALT        = 0x08,      //  Alt pressed
  L_CTRL     = 0x0100,    //  Left Ctrl pressed
  L_ALT      = 0x0200,    //  Left Alt pressed
  R_CTRL     = 0x0400,    //  Right Ctrl pressed
  R_ALT      = 0x0800     //  Right Alt pressed
};


//---------------------------------------------------
//  interrupt handlers
//---------------------------------------------------
extern void interrupt (*old_09)(__ARGS);
void interrupt new_09 (__ARGS);
extern void interrupt (*old_1C)(__ARGS);
void interrupt new_1C (__ARGS);
extern void interrupt (*old_28)(__ARGS);
void interrupt new_28 (__ARGS);
extern void interrupt (*old_13)(__ARGS);
void interrupt new_13 (__FULL_ARGS);
extern void interrupt (*old_2F)(__ARGS);
extern "C" void interrupt NEW_2F (void);
const OFFSET_DS = 19;           // segment \ FLAG_TO_UNLOAD
const OFFSET_FL = 25;           // offset  /
const OFFSET_DS_SL = 36;        // segment \ FLAG_UNLOADING
const OFFSET_FL_SL = 42;        // offset  /
const OFFSET_DS_AW = 53;        // segment \ FLAG_UNLOADING
const OFFSET_FL_AW = 62;        // offset  / for awake
const OFFSET_28 = 68;           // -- ¡¢  «(c) ISR 0x28
extern void interrupt (*old_24)(__ARGS);
void interrupt new_24 (__FULL_ARGS);
extern void interrupt (*old_23)(__ARGS);
void interrupt new_23 (__FULL_ARGS);

#endif