gnushogi/init-common.c

   1 /*
   2  * FILE: init-common.c
   3  *
   4  * ----------------------------------------------------------------------
   5  * Copyright (c) 1993, 1994, 1995 Matthias Mutz
   6  * Copyright (c) 1999 Michael Vanier and the Free Software Foundation
   7  * Copyright (c) 2008, 2013, 2014 Yann Dirson and the Free Software Foundation
   8  *
   9  * GNU SHOGI is based on GNU CHESS
  10  *
  11  * Copyright (c) 1988, 1989, 1990 John Stanback
  12  * Copyright (c) 1992 Free Software Foundation
  13  *
  14  * This file is part of GNU SHOGI.
  15  *
  16  * GNU Shogi is free software; you can redistribute it and/or modify it
  17  * under the terms of the GNU General Public License as published by the
  18  * Free Software Foundation; either version 3 of the License,
  19  * or (at your option) any later version.
  20  *
  21  * GNU Shogi is distributed in the hope that it will be useful, but WITHOUT
  22  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  23  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  24  * for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License along
  27  * with GNU Shogi; see the file COPYING. If not, see
  28  * <http://www.gnu.org/licenses/>.
  29  * ----------------------------------------------------------------------
  30  *
  31  */
  32 #include "gnushogi.h"
  33 #include "pattern.h"
  34
  35 unsigned int ttbllimit;
  36
  37 /*
  38  * ptype is used to separate black and white pawns, like this; ptyp =
  39  * ptype[side][piece] piece can be used directly in nextpos/nextdir when
  40  * generating moves for pieces that are not white pawns.
  41  */
  42
  43 const small_short ptype[2][NO_PIECES] =
  44 {
  45     {
  46         ptype_no_piece, ptype_pawn,
  47 #ifndef MINISHOGI
  48         ptype_lance,  ptype_knight,
  49 #endif
  50         ptype_silver,   ptype_gold,  ptype_bishop, ptype_rook,
  51         ptype_gold,
  52 #ifndef MINISHOGI
  53         ptype_gold,  ptype_gold,
  54 #endif
  55         ptype_gold,
  56         ptype_pbishop,  ptype_prook, ptype_king
  57     },
  58     {
  59         ptype_no_piece, ptype_wpawn,
  60 #ifndef MINISHOGI
  61         ptype_wlance, ptype_wknight,
  62 #endif
  63         ptype_wsilver,  ptype_wgold, ptype_bishop, ptype_rook,
  64         ptype_wgold,
  65 #ifndef MINISHOGI
  66         ptype_wgold, ptype_wgold,
  67 #endif
  68         ptype_wgold,
  69         ptype_pbishop,  ptype_prook, ptype_king
  70     },
  71 };
  72
  73 const small_short promoted[NO_PIECES] =
  74 {
  75     no_piece, ppawn,
  76 #ifndef MINISHOGI
  77     plance, pknight,
  78 #endif
  79     psilver, gold, pbishop, prook,
  80     ppawn,
  81 #ifndef MINISHOGI
  82     plance, pknight,
  83 #endif
  84     psilver, pbishop, prook, king
  85 };
  86
  87 const small_short unpromoted[NO_PIECES] =
  88 {
  89     no_piece, pawn,
  90 #ifndef MINISHOGI
  91     lance, knight,
  92 #endif
  93     silver, gold, bishop, rook,
  94     pawn,
  95 #ifndef MINISHOGI
  96     lance, knight,
  97 #endif
  98     silver, bishop, rook, king
  99 };
 100
 101
 102 /* .... MOVE GENERATION VARIABLES AND INITIALIZATIONS .... */
 103
 104 #ifndef WIN32
 105 #define max(a, b) (((a) < (b))?(b):(a))
 106 #endif
 107 #define odd(a) ((a) & 1)
 108
 109 const small_short piece_of_ptype[NO_PTYPE_PIECES] =
 110 {
 111     pawn,
 112 #ifndef MINISHOGI
 113     lance, knight,
 114 #endif
 115     silver, gold, bishop, rook, pbishop, prook, king,
 116     pawn,
 117 #ifndef MINISHOGI
 118     lance, knight,
 119 #endif
 120     silver, gold
 121 };
 122
 123
 124 /* FIXME: all bishops and rooks are black ? */
 125 const small_short side_of_ptype[NO_PTYPE_PIECES] =
 126 {
 127     black,
 128 #ifndef MINISHOGI
 129     black, black,
 130 #endif
 131     black, black, black, black, black, black, black,
 132     white,
 133 #ifndef MINISHOGI
 134     white, white,
 135 #endif
 136     white, white
 137 };
 138
 139
 140 int
 141 Initialize_data(void)
 142 {
 143     size_t n;
 144     int i;
 145     char buffer[60];
 146     int doit = true;
 147
 148     {
 149         small_short x = -1;
 150
 151         if (x >= 0)
 152         {
 153             ShowMessage("datatype 'small_short' is unsigned; "
 154                         "check gnushogi.h\n");
 155             return 1;
 156         }
 157     }
 158
 159     n = sizeof(struct leaf) * (size_t)TREE;
 160     Tree = malloc(n);
 161
 162     if (!Tree)
 163     {
 164         sprintf(buffer, "Cannot allocate %ld bytes for search tree",
 165                 (long)n);
 166         ShowMessage(buffer);
 167         return 1;
 168     }
 169
 170     n = sizeof(hashcode_array);
 171     hashcode = malloc(n);
 172
 173     if (!hashcode)
 174     {
 175         sprintf(buffer, "Cannot allocate %ld bytes for hashcode", (long)n);
 176         ShowMessage(buffer);
 177         return 1;
 178     }
 179
 180     n = sizeof(drop_hashcode_array);
 181     drop_hashcode = malloc(n);
 182
 183     if (!drop_hashcode)
 184     {
 185         sprintf(buffer,
 186                 "Cannot allocate %ld bytes for drop_hashcode",
 187                 (long)n);
 188         ShowMessage(buffer);
 189         return 1;
 190     }
 191
 192     n = sizeof(struct GameRec) * (size_t)(MAXMOVES + MAXDEPTH);
 193     GameList = malloc(n);
 194
 195     if (!GameList)
 196     {
 197         sprintf(buffer,
 198                 "Cannot allocate %ld bytes for game record",
 199                 (long)n);
 200         ShowMessage(buffer);
 201         return 1;
 202     }
 203
 204 #if !defined SAVE_NEXTPOS
 205     n = sizeof(next_array);
 206
 207     for (i = 0; i < NO_PTYPE_PIECES; i++)
 208     {
 209         nextdir[i] = use_nextpos ? malloc(n) : NULL;
 210
 211         if (!nextdir[i])
 212         {
 213             if (use_nextpos)
 214             {
 215                 sprintf(buffer, "cannot allocate %ld space for nextdir %d",
 216                         (long)(n), i);
 217                 ShowMessage(buffer);
 218             }
 219
 220             nextdir[i] = NULL;
 221             use_nextpos = false;
 222         }
 223
 224         nextpos[i] = use_nextpos ? malloc(n) : NULL;
 225
 226         if (!nextpos[i])
 227         {
 228             if (use_nextpos)
 229             {
 230                 sprintf(buffer, "cannot allocate %ld space for nextpos %d",
 231                         (long)(n), i);
 232                 ShowMessage(buffer);
 233             }
 234
 235             use_nextpos = false;
 236         }
 237     }
 238
 239     if (!use_nextpos)
 240     {
 241         return 1;
 242     }
 243 #endif
 244
 245     n = sizeof(value_array);
 246     value = malloc(n);
 247
 248     if (!value)
 249     {
 250         ShowMessage("cannot allocate value space");
 251         return 1;
 252     }
 253
 254     n = sizeof(fscore_array);
 255     fscore = malloc(n);
 256
 257     if (!fscore)
 258     {
 259         ShowMessage("cannot allocate fscore space");
 260         return 1;
 261     }
 262
 263 #if defined HISTORY
 264     n = sizeof_history;
 265     history = malloc(n);
 266
 267     if (!history)
 268     {
 269         sprintf(buffer, "Cannot allocate %ld bytes for history table",
 270                 (long)sizeof_history);
 271         ShowMessage(buffer);
 272         use_history = false;
 273     }
 274 #endif
 275
 276 #if defined CACHE
 277     n = sizeof(struct etable) * (size_t)ETABLE;
 278
 279     for (i = 0; i < 2; i++)
 280     {
 281         etab[i] = use_etable ? malloc(n) : 0;
 282
 283         if (!etab[i])
 284         {
 285             sprintf(buffer, "Cannot allocate %ld bytes for cache table %ld",
 286                     (long)n, (long)i);
 287             ShowMessage(buffer);
 288             use_etable = false;
 289         }
 290     }
 291 #endif
 292
 293 #if ttblsz
 294
 295     if (rehash < 0)
 296         rehash = MAXrehash;
 297
 298     n = sizeof(struct hashentry)*(ttblsize + rehash);
 299
 300     while (doit && ttblsize > MINTTABLE)
 301     {
 302         ttable[0] = malloc(n);  /* FIXME: cast to the correct type. */
 303         ttable[1] = ttable[0] ? malloc(n) : NULL;
 304
 305         if (!ttable[0] || !ttable[1])
 306         {
 307             if (!ttable[0])
 308                 free(ttable[0]);
 309
 310             if (!ttable[1])
 311                 free(ttable[1]);
 312
 313             ttblsize = ttblsize >> 1;
 314             n = sizeof(struct hashentry) * (ttblsize + rehash);
 315         }
 316         else
 317         {
 318             doit = false;
 319         }
 320     }
 321
 322     if (ttblsize <= MINTTABLE)
 323     {
 324         use_ttable = false;
 325     }
 326
 327     if (use_ttable)
 328     {
 329         /* CHECKME: is the precedence here correct? */
 330         /* ttbllimit = ttblsize << 1 - ttblsize >> 2; */
 331         ttbllimit = (ttblsize << 1) - (ttblsize >> 2);
 332     }
 333     else
 334     {
 335         sprintf(buffer, "Cannot allocate %ld bytes for transposition table",
 336                 (long)(2 * n));
 337         ShowMessage(buffer);
 338         ttable[0] = ttable[1] = NULL;
 339     }
 340 #endif /* ttblsz */
 341
 342 #if !defined SAVE_DISTDATA
 343     n = sizeof(distdata_array);
 344     distdata = malloc(n);
 345
 346     if (!distdata)
 347     {
 348         ShowMessage("cannot allocate distdata space...");
 349         use_distdata = false;
 350     }
 351 #endif
 352
 353 #if !defined SAVE_PTYPE_DISTDATA
 354     n = sizeof(distdata_array);
 355
 356     for (i = 0; i < NO_PTYPE_PIECES; i++)
 357     {
 358         ptype_distdata[i] = use_ptype_distdata ? malloc(n) : 0;
 359
 360         if (!ptype_distdata[i])
 361         {
 362             sprintf(buffer,
 363                     "cannot allocate %ld bytes for ptype_distdata %d...",
 364                     (long)n, i);
 365             use_ptype_distdata = false;
 366         }
 367     }
 368 #endif
 369
 370     return 0;
 371 }
 372
 373
 374 #ifdef SAVE_PTYPE_DISTDATA
 375 short
 376 piece_distance(short side, short piece, short f, short t)
 377 {
 378     return ((f > NO_SQUARES)
 379             ? (short)1
 380             : (short)ptype_distance(ptype[side][piece], f, t));
 381 }
 382 #else
 383 short
 384 piece_distance(short side, short piece, short f, short t)
 385 {
 386     return ((f > NO_SQUARES)
 387             ? (short)1
 388             : (use_ptype_distdata
 389                ? (short)(*ptype_distdata[ptype[side][piece]])[f][t]
 390                : (short)ptype_distance(ptype[side][piece], f, t)));
 391 }
 392 #endif
 393
 394
 395 /*
 396  * Determine the minimum number of moves for a piece from
 397  * square "f" to square "t". If the piece cannot reach "t",
 398  * the count is set to CANNOT_REACH.
 399  */
 400
 401 #define csquare(sq) ((side == black) ? sq : (NO_SQUARES - 1 - sq))
 402 #define crow(sq) row(csquare(sq))
 403 #define ccol(sq) column(csquare(sq))
 404
 405 short
 406 ptype_distance(short ptyp, short f, short t)
 407 {
 408     short side, piece;
 409     short colf, colt, rowf, rowt, dcol, drow;
 410
 411     if (f == t)
 412         return 0;
 413
 414     piece = piece_of_ptype[ptyp];
 415     side  = side_of_ptype[ptyp];
 416
 417     dcol = (colt = ccol(t)) - (colf = ccol(f));
 418     drow = (rowt = crow(t)) - (rowf = crow(f));
 419
 420     switch (piece)
 421     {
 422     case pawn:
 423         if ((dcol != 0) || (drow < 1))
 424             return CANNOT_REACH;
 425         else
 426             return drow;
 427
 428 #ifndef MINISHOGI
 429     case lance:
 430         if ((dcol != 0) || (drow < 1))
 431             return CANNOT_REACH;
 432         else
 433             return 1;
 434
 435     case knight:
 436         if (odd(drow) || (odd(drow / 2) != odd(dcol)))
 437             return CANNOT_REACH;
 438         else if ((drow == 0) || ((drow / 2) < abs(dcol)))
 439             return CANNOT_REACH;
 440         else
 441             return (drow / 2);
 442 #endif
 443
 444     case silver:
 445         if (drow > 0)
 446         {
 447             if (odd(drow) == odd(dcol))
 448             {
 449                 return max(abs(drow), abs(dcol));
 450             }
 451             else
 452             {
 453                 if (abs(dcol) <= drow)
 454                     return drow;
 455                 else
 456                     return (max(abs(drow), abs(dcol)) + 1);
 457             }
 458         }
 459         else
 460         {
 461             if (odd(drow) == odd(dcol))
 462                 return (max(abs(drow), abs(dcol)));
 463             else
 464                 return (max(abs(drow) + 1, abs(dcol)) + 1);
 465         };
 466
 467     case gold:
 468     case ppawn:
 469 #ifndef MINISHOGI
 470     case pknight:
 471     case plance:
 472 #endif
 473     case psilver:
 474         if (abs(dcol) == 0)
 475             return (abs(drow));
 476         else if (drow >= 0)
 477             return max(drow, abs(dcol));
 478         else
 479             return (abs(dcol) - drow);
 480
 481     case bishop:
 482         if (odd(dcol) != odd(drow))
 483             return CANNOT_REACH;
 484         else
 485             return ((abs(dcol) == abs(drow)) ? 1 : 2);
 486
 487     case pbishop:
 488         if (odd(dcol) != odd(drow))
 489         {
 490             if ((abs(dcol) <= 1) && (abs(drow) <= 1))
 491                 return 1;
 492             else if (abs(abs(dcol) - abs(drow)) == 1)
 493                 return 2;
 494             else
 495                 return 3;
 496         }
 497         else
 498         {
 499             return ((abs(dcol) == abs(drow)) ? 1 : 2);
 500         }
 501
 502     case rook:
 503         if ((dcol == 0) || (drow == 0))
 504             return 1;
 505         else
 506             return 2;
 507
 508     case prook:
 509         if ((dcol == 0) || (drow == 0))
 510             return 1;
 511         else if ((abs(dcol) == 1) && (abs(drow) == 1))
 512             return 1;
 513         else
 514             return 2;
 515
 516     case king:
 517         return max(abs(drow), abs(dcol));
 518
 519     default:
 520         /* should never occur */
 521         return (CANNOT_REACH);
 522     }
 523 }