/***************************************************************************/
/*                                                                         */
/*                                                                         */
/* Raven 3D Engine                                                         */
/* Copyright (C) 1996 by Softdisk Publishing                               */
/*                                                                         */
/* Original Design:                                                        */
/*  John Carmack of id Software                                            */
/*                                                                         */
/* Enhancements by:                                                        */
/*  Robert Morgan of Channel 7............................Main Engine Code */
/*  Todd Lewis of Softdisk Publishing......Tools,Utilities,Special Effects */
/*  John Bianca of Softdisk Publishing..............Low-level Optimization */
/*  Carlos Hasan..........................................Music/Sound Code */
/*                                                                         */
/*                                                                         */
/***************************************************************************/

#include <PROCESS.H>
#include <STRING.H>
#include <CTYPE.H>
#include <STDARG.H>
#include <STDIO.H>
#include <CONIO.H>
#include <DOS.H>
#include "d_global.h"
#include "d_ints.h"
#include "d_video.h"
#include "d_misc.h"
#include "protos.h"


/**** CONSTANTS ****/

#define DPMIINT       0x31
#define DPMILOCKMEM   0x600
#define DPMIUNLOCKMEM 0x601
#define DOSGETMEM     0x100
#define DOSFREEMEM    0x101


/**** VARIABLES ****/

int  my_argc;
char ** my_argv;
int  rndofs;
byte rndtable[512] =
 {
    0,   8, 109, 220, 222, 241, 149, 107,  75, 248, 254, 140,  16,  66,
   74,  21, 211,  47,  80, 242, 154,  27, 205, 128, 161,  89,  77,  36,
   95, 110,  85,  48, 212, 140, 211, 249,  22,  79, 200,  50,  28, 188,
   52, 140, 202, 120,  68, 145,  62,  70, 184, 190,  91, 197, 152, 224,
  149, 104,  25, 178, 252, 182, 202, 182, 141, 197,   4,  81, 181, 242,
  145,  42,  39, 227, 156, 198, 225, 193, 219,  93, 122, 175, 249,   0,
  175, 143,  70, 239,  46, 246, 163,  53, 163, 109, 168, 135,   2, 235,
   25,  92,  20, 145, 138,  77,  69, 166,  78, 176, 173, 212, 166, 113,
   94, 161,  41,  50, 239,  49, 111, 164,  70,  60,   2,  37, 171,  75,
  136, 156,  11,  56,  42, 146, 138, 229,  73, 146,  77,  61,  98, 196,
  135, 106,  63, 197, 195,  86,  96, 203, 113, 101, 170, 247, 181, 113,
   80, 250, 108,   7, 255, 237, 129, 226,  79, 107, 112, 166, 103, 241,
   24, 223, 239, 120, 198,  58,  60,  82, 128,   3, 184,  66, 143, 224,
  145, 224,  81, 206, 163,  45,  63,  90, 168, 114,  59,  33, 159,  95,
   28, 139, 123,  98, 125, 196,  15,  70, 194, 253,  54,  14, 109, 226,
   71,  17, 161,  93, 186,  87, 244, 138,  20,  52, 123, 251,  26,  36,
   17,  46,  52, 231, 232,  76,  31, 221,  84,  37, 216, 165, 212, 106,
  197, 242,  98,  43,  39, 175, 254, 145, 190,  84, 118, 222, 187, 136,
  120, 163, 236, 249,
   74,  21, 211,  47,  80, 242, 154,  27, 205, 128, 161,  89,  77,  36,
  149, 104,  25, 178, 252, 182, 202, 182, 141, 197,   4,  81, 181, 242,
  135, 106,  63, 197, 195,  86,  96, 203, 113, 101, 170, 247, 181, 113,
   71,  17, 161,  93, 186,  87, 244, 138,  20,  52, 123, 251,  26,  36,
  197, 242,  98,  43,  39, 175, 254, 145, 190,  84, 118, 222, 187, 136,
   25,  92,  20, 145, 138,  77,  69, 166,  78, 176, 173, 212, 166, 113,
   94, 161,  41,  50, 239,  49, 111, 164,  70,  60,   2,  37, 171,  75,
  175, 143,  70, 239,  46, 246, 163,  53, 163, 109, 168, 135,   2, 235,
   52, 140, 202, 120,  68, 145,  62,  70, 184, 190,  91, 197, 152, 224,
  145, 224,  81, 206, 163,  45,  63,  90, 168, 114,  59,  33, 159,  95,
   17,  46,  52, 231, 232,  76,  31, 221,  84,  37, 216, 165, 212, 106,
   80, 250, 108,   7, 255, 237, 129, 226,  79, 107, 112, 166, 103, 241,
  145,  42,  39, 227, 156, 198, 225, 193, 219,  93, 122, 175, 249,   0,
   95, 110,  85,  48, 212, 140, 211, 249,  22,  79, 200,  50,  28, 188,
    0,   8, 109, 220, 222, 241, 149, 107,  75, 248, 254, 140,  16,  66,
  136, 156,  11,  56,  42, 146, 138, 229,  73, 146,  77,  61,  98, 196,
   24, 223, 239, 120, 198,  58,  60,  82, 128,   3, 184,  66, 143, 224,
   28, 139, 123,  98, 125, 196,  15,  70, 194, 253,  54,  14, 109, 226,
  120, 163, 236, 249
  };

/**** FUNCTIONS ****/

int MS_CheckParm(char *check)
/* checks for a parameter on the command line
   returns argument number if found */
{
 int  i;
 char *parm;

 for (i=1;i<my_argc;i++)
  {
   parm=my_argv[i];
   while (!isalpha(*parm))	// skip - / \ etc.. in front of parm
   if (!*parm++) break;   	// hit end of string without an alphanum
   if (!stricmp(check,parm)) return i;
   }
 return 0;
 }


void MS_Error(char *error,...)
/* exit with an error message
   shuts everything down */
{
 va_list argptr;
 byte    *vidmode;

 INT_Shutdown();
 vidmode=(byte*)(0x40*16 + 0x49);
 if (*vidmode!=3) VI_SetTextMode();
 va_start(argptr,error);
 vprintf(error,argptr);
 va_end(argptr);
 while (kbhit()) getch();
 exit(1);
 }


void MS_ExitClean(void)
/* exits without error message */
{
 INT_Shutdown();
 VI_SetTextMode();
 exit(0);
 }


void MS_FreeDOSMem(int sel)
{
 union REGS r;

 r.w.ax=DOSFREEMEM;
 r.w.dx=sel;
 int386(DPMIINT,&r,&r);
 }


void MS_GetDOSMem(int size,int *seg,int *sel)
{
 union REGS r;

 r.w.ax=DOSGETMEM;
 r.w.bx=(size/16) + 1;  // number of paragraphs
 int386(DPMIINT,&r,&r);
 if (r.w.cflag)
  MS_Error("GEN_GetDOSMem: Error Getting DOS Memory");
 *seg=r.w.ax;
 *sel=r.w.dx;
 }