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init.c
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1994-04-21
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//
// Copyright (C) 1986, 1987, 1988, 1989, 1990 Free Software Foundation, Inc.
// Copyright (c) 1988, 1989, 1990 John Stanback
//
// Project: OS/2 PM Port of GNU CHESS 4.0 (PmChess)
//
// Version: 1994-4-17
//
// Porter: Ported to Windows 3.0 by Darly Baker
//
// Porter: Ported to OS/2 1.2+ by Kent Cedola
//
// Porter: Revised and ported to OS/2 2.1 by Yibing Fan
//
// System: OS2 2.1 using emx0.8g
////
// Remarks: This code converted from Windows to PM using a straight port
// method with some editing improvements. Some of the logic
// required for poor old Windows has been removed since super-
// duper OS/2 is better with memory...
//
// Fuctions defined in this module:
// Initialize_dist (void)
// Initialize_moves (void)
// int init_main (HWND hWnd)
// void NewGame (HWND hWnd)
//
// License:
//
// CHESS is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY. No author or distributor accepts responsibility to anyone for
// the consequences of using it or for whether it serves any particular
// purpose or works at all, unless he says so in writing. Refer to the
// CHESS General Public License for full details.
//
// Everyone is granted permission to copy, modify and redistribute CHESS,
// but only under the conditions described in the CHESS General Public
// License. A copy of this license is supposed to have been given to you
// along with CHESS so you can know your rights and responsibilities. It
// should be in a file named COPYING. Among other things, the copyright
// notice and this notice must be preserved on all copies.
//
#define INCL_DOS
#define INCL_PM
#include <os2.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "PmChess.h"
#include "GnuChess.h"
#include "Defs.h"
extern HWND hStats;
extern short distdata[64][64], taxidata[64][64];
extern FILE *hashfile;
extern short stage, stage2, Developed[2];
extern short ChkFlag[MAXDEPTH], CptrFlag[MAXDEPTH], PawnThreat[MAXDEPTH];
extern short Pscore[MAXDEPTH], Tscore[MAXDEPTH];
extern short rehash, BAwindow, BBwindow, WAwindow, WBwindow;
extern long Level;
extern unsigned int TTadd;
unsigned int ttbllimit;
extern int UseBook;
extern struct hashval hashcode[2][7][64];
//extern unsigned char * history;
extern short board[64], color[64];
extern unsigned char nextpos[8][64][64];
extern unsigned char nextdir[8][64][64];
/*
ptype is used to separate white and black pawns, like this;
ptyp = ptype[side][piece]
piece can be used directly in nextpos/nextdir when generating moves
for pieces that are not black pawns.
*/
const short ptype[2][8] =
{
{no_piece, pawn, knight, bishop, rook, queen, king, no_piece},
{no_piece, bpawn, knight, bishop, rook, queen, king, no_piece}};
static short direc[8][8] =
{
{0, 0, 0, 0, 0, 0, 0, 0},
{10, 9, 11, 0, 0, 0, 0, 0},
{8, -8, 12, -12, 19, -19, 21, -21},
{9, 11, -9, -11, 0, 0, 0, 0},
{1, 10, -1, -10, 0, 0, 0, 0},
{1, 10, -1, -10, 9, 11, -9, -11},
{1, 10, -1, -10, 9, 11, -9, -11},
{-10, -9, -11, 0, 0, 0, 0, 0}};
static short max_steps[8] =
{0, 2, 1, 7, 7, 7, 1, 2};
static short nunmap[120] =
{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, -1,
-1, 8, 9, 10, 11, 12, 13, 14, 15, -1,
-1, 16, 17, 18, 19, 20, 21, 22, 23, -1,
-1, 24, 25, 26, 27, 28, 29, 30, 31, -1,
-1, 32, 33, 34, 35, 36, 37, 38, 39, -1,
-1, 40, 41, 42, 43, 44, 45, 46, 47, -1,
-1, 48, 49, 50, 51, 52, 53, 54, 55, -1,
-1, 56, 57, 58, 59, 60, 61, 62, 63, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
const short Stboard[64] =
{rook, knight, bishop, queen, king, bishop, knight, rook,
pawn, pawn, pawn, pawn, pawn, pawn, pawn, pawn,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pawn, pawn, pawn, pawn, pawn, pawn, pawn, pawn,
rook, knight, bishop, queen, king, bishop, knight, rook};
const short Stcolor[64] =
{white, white, white, white, white, white, white, white,
white, white, white, white, white, white, white, white,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
black, black, black, black, black, black, black, black,
black, black, black, black, black, black, black, black};
/* given epsquare, from where can a pawn be taken? */
const short epmove1[64] =
{0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 24, 25, 26, 27, 28, 29, 30,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
40, 32, 33, 34, 35, 36, 37, 38,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63};
const short epmove2[64] =
{0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
25, 26, 27, 28, 29, 30, 31, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
33, 34, 35, 36, 37, 38, 39, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63};
void
Initialize_dist (void)
{
register short a, b, d, di;
for (a = 0; a < 64; a++)
for (b = 0; b < 64; b++)
{
d = abs (column (a) - column (b));
di = abs (row (a) - row (b));
taxidata[a][b] = d + di;
distdata[a][b] = (d > di ? d : di);
}
}
int InitFlag = false;
void
Initialize_moves (void)
/*
This procedure pre-calculates all moves for every piece from every square.
This data is stored in nextpos/nextdir and used later in the move generation
routines.
*/
{
short ptyp, po, p0, d, di, s, delta;
unsigned char *ppos, *pdir;
short dest[8][8];
short steps[8];
short sorted[8];
for (ptyp = 0; ptyp < 8; ptyp++)
for (po = 0; po < 64; po++)
for (p0 = 0; p0 < 64; p0++)
{
nextpos[ptyp][po][p0] = (UCHAR)po;
nextdir[ptyp][po][p0] = (UCHAR)po;
}
for (ptyp = 1; ptyp < 8; ptyp++)
for (po = 21; po < 99; po++)
if (nunmap[po] >= 0)
{
ppos = nextpos[ptyp][nunmap[po]];
pdir = nextdir[ptyp][nunmap[po]];
/* dest is a function of direction and steps */
for (d = 0; d < 8; d++)
{
dest[d][0] = nunmap[po];
delta = direc[ptyp][d];
if (delta != 0)
{
p0 = po;
for (s = 0; s < max_steps[ptyp]; s++)
{
p0 = p0 + delta;
/*
break if (off board) or
(pawns only move two steps from home square)
*/
if (nunmap[p0] < 0 || ((ptyp == pawn || ptyp == bpawn)
&& s > 0 && (d > 0 || Stboard[nunmap[po]] != pawn)))
break;
else
dest[d][s] = nunmap[p0];
}
}
else
s = 0;
/*
sort dest in number of steps order
currently no sort is done due to compability with
the move generation order in old gnu chess
*/
steps[d] = s;
for (di = d; s > 0 && di > 0; di--)
if (steps[sorted[di - 1]] == 0) /* should be: < s */
sorted[di] = sorted[di - 1];
else
break;
sorted[di] = d;
}
/*
update nextpos/nextdir,
pawns have two threads (capture and no capture)
*/
p0 = nunmap[po];
if (ptyp == pawn || ptyp == bpawn)
{
for (s = 0; s < steps[0]; s++)
{
ppos[p0] = (unsigned char) dest[0][s];
p0 = dest[0][s];
}
p0 = nunmap[po];
for (d = 1; d < 3; d++)
{
pdir[p0] = (unsigned char) dest[d][0];
p0 = dest[d][0];
}
}
else
{
pdir[p0] = (unsigned char) dest[sorted[0]][0];
for (d = 0; d < 8; d++)
for (s = 0; s < steps[sorted[d]]; s++)
{
ppos[p0] = (unsigned char) dest[sorted[d]][s];
p0 = dest[sorted[d]][s];
if (d < 7)
pdir[p0] = (unsigned char) dest[sorted[d + 1]][0];
/* else is already initialized */
}
}
}
}
/* hmm.... shouldn`t main be moved to the interface routines */
int init_main (HWND hWnd)
{
short int ahead = true, hash = true;
CHAR *Lang=NULL;
Level = 0;
TCflag = false;
OperatorTime = 0;
Initialize ();
InitConst (Lang);
Initialize_dist ();
Initialize_moves ();
NewGame (hWnd);
flag.easy = ahead;
flag.hash = hash;
hashfile = NULL;
return (0);
}
void NewGame (HWND hWnd)
/*
Reset the board and other variables to start a new game.
*/
{
short l, c, p;
compptr = oppptr = 0;
stage = stage2 = -1; /* the game is not yet started */
if ( flag.post ) {
WinSendMsg(hStats, WM_SYSCOMMAND, MPFROMSHORT(SC_CLOSE), 0);
flag.post = false;
}
flag.mate = flag.quit = flag.reverse = flag.bothsides = false;
flag.force = false;
flag.hash = flag.easy = flag.beep = flag.rcptr = true;
NodeCnt = et0 = epsquare = 0;
dither = 0;
WAwindow = 90;
WBwindow = 90;
BAwindow = 90;
BBwindow = 90;
xwndw = 90;
MaxSearchDepth = 29;
contempt = 0;
GameCnt = 0;
Game50 = 1;
hint = 0x0C14;
ZeroRPT ();
Developed[white] = Developed[black] = false;
castld[white] = castld[black] = false;
PawnThreat[0] = CptrFlag[0] = false;
Pscore[0] = 12000;
Tscore[0] = 12000;
opponent = white;
computer = black;
for (l = 0; l < 2000; l++)
Tree[l].f = Tree[l].t = 0;
srand ((unsigned int) 1);
if (!InitFlag)
{
for (c = white; c <= black; c++)
for (p = pawn; p <= king; p++)
for (l = 0; l < 64; l++)
{
hashcode[c][p][l].key = (((unsigned long) urand ()));
hashcode[c][p][l].key += (((unsigned long) urand ()) << 16);
hashcode[c][p][l].bd = (((unsigned long) urand ()));
hashcode[c][p][l].bd += (((unsigned long) urand ()) << 16);
}
}
for (l = 0; l < 64; l++)
{
board[l] = Stboard[l];
color[l] = Stcolor[l];
Mvboard[l] = 0;
}
InitializeStats ();
time0 = time ((long *) 0);
ElapsedTime (1);
flag.regularstart = true;
if (UseBook) { Book = BOOKFAIL; }
else { Book = 0; }
/* endif */
if (!InitFlag)
{
if (TCflag) SetTimeControl ();
else if (MaxResponseTime == 0)
{
OperatorTime = 1;
TCmoves = 60;
TCminutes = 5;
TCflag = (TCmoves > 1);
SetTimeControl ();
}
UpdateDisplay (hWnd, 0, 0, 1, 0);
GetOpenings ( hWnd);
Initialize_ttable();
InitFlag = true;
}
if(TTadd){ZeroTTable (); TTadd = 0;}
}
#ifdef ttblsz
void Initialize_ttable ()
{
int doit = true;
if (rehash < 0) rehash = MAXrehash;
while(doit && ttblsize > MINTTABLE){
ttable[0] = (struct hashentry *)malloc((unsigned)(sizeof(struct hashentry)*(ttblsize+rehash)));
ttable[1] = (struct hashentry *)malloc((unsigned)(sizeof(struct hashentry)*(ttblsize+rehash)));
if(ttable[0] == NULL || ttable[1] == NULL){
if(ttable[0] != NULL)free(ttable[0]);
ttblsize = ttblsize>>1;
} else doit = false;
}
if(ttable[0] == NULL || ttable[1] == NULL){ perror("memory alloc");exit(1);}
/*
printf("transposition table is %d\n",ttblsize);
*/
ttbllimit = (ttblsize<<1) - (ttblsize>>2);
}
#endif /* ttblsz */
void
InitConst (char *lang)
{
FILE *constfile;
char s[256];
char sl[5];
int len, entry;
char *p, *q;
constfile = fopen (LANGFILE, "r");
if (!constfile)
{
printf ("NO LANGFILE\n");
exit (1);
}
while (fgets (s, sizeof (s), constfile))
{
if (s[0] == '!')
continue;
len = strlen (s);
for (q = &s[len]; q > &s[8]; q--)
if (*q == '}')
break;
if (q == &s[8])
{
printf ("{ error in cinstfile\n");
exit (1);
}
*q = '\0';
if (s[3] != ':' || s[7] != ':' || s[8] != '{')
{
printf ("Langfile format error %s\n", s);
exit (1);
}
s[3] = s[7] = '\0';
if (lang == NULL)
{
lang = sl;
strcpy (sl, &s[4]);
}
if (strcmp (&s[4], lang))
continue;
entry = atoi (s);
if (entry < 0 || entry >= CPSIZE)
{
printf ("Langfile number error\n");
exit (1);
}
for (q = p = &s[9]; *p; p++)
{
if (*p != '\\')
{
*q++ = *p;
}
else if (*(p + 1) == 'n')
{
*q++ = '\n';
p++;
}
}
*q = '\0';
if (entry < 0 || entry > 255)
{
printf ("Langfile error %d\n", entry);
exit (0);
}
CP[entry] = (char *) malloc ((unsigned) strlen (&s[9]) + 1);
if (CP[entry] == NULL)
{
perror ("malloc");
exit (0);
}
strcpy (CP[entry], &s[9]);
}
fclose (constfile);
}