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- 30 #include "rules.h"
- 31 #include "chess.h"
- 32 #include <string.h>
- 33 #include <stdlib.h>
- 34 #include <sys/time.h>
- 35
- 36 static GameState gamestate_copy_sim(GameState *gamestate) {
- 37 GameState simulation = *gamestate;
- 38 if (simulation.lastmove) {
- 39 MoveList *lastmovecopy = malloc(sizeof(MoveList));
- 40 *lastmovecopy = *(simulation.lastmove);
- 41 simulation.movelist = simulation.lastmove = lastmovecopy;
- 42 }
- 43
- 44 return simulation;
- 45 }
- 46
- 47 void gamestate_init(GameState *gamestate) {
- 48 memset(gamestate, 0, sizeof(GameState));
- 49
- 50 Board initboard = {
- 51 {WROOK, WKNIGHT, WBISHOP, WQUEEN, WKING, WBISHOP, WKNIGHT, WROOK},
- 52 {WPAWN, WPAWN, WPAWN, WPAWN, WPAWN, WPAWN, WPAWN, WPAWN},
- 53 {0, 0, 0, 0, 0, 0, 0, 0},
- 54 {0, 0, 0, 0, 0, 0, 0, 0},
- 55 {0, 0, 0, 0, 0, 0, 0, 0},
- 56 {0, 0, 0, 0, 0, 0, 0, 0},
- 57 {BPAWN, BPAWN, BPAWN, BPAWN, BPAWN, BPAWN, BPAWN, BPAWN},
- 58 {BROOK, BKNIGHT, BBISHOP, BQUEEN, BKING, BBISHOP, BKNIGHT, BROOK}
- 59 };
- 60 memcpy(gamestate->board, initboard, sizeof(Board));
- 61 }
- 62
- 63 void gamestate_cleanup(GameState *gamestate) {
- 64 MoveList *elem;
- 65 elem = gamestate->movelist;
- 66 while (elem) {
- 67 MoveList *cur = elem;
- 68 elem = elem->next;
- 69 free(cur);
- 70 };
- 71 }
- 72
- 73
- 74 static void format_move(GameState *gamestate, Move *move) {
- 75 char *string = move->string;
- 76
- 77
- 78 memset(string, 0, 8);
- 79
- 80
- 81 if ((move->piece&PIECE_MASK) == KING &&
- 82 abs(move->tofile-move->fromfile) == 2) {
- 83 if (move->tofile==fileidx('c')) {
- 84 memcpy(string, "O-O-O", 5);
- 85 } else {
- 86 memcpy(string, "O-O", 3);
- 87 }
- 88 }
- 89
- 90
- 91 string[0] = getpiecechr(move->piece);
- 92 int idx = string[0] ? 1 : 0;
- 93
- 94
- 95 uint8_t piece = move->piece & PIECE_MASK;
- 96 if (piece == PAWN) {
- 97 if (move->capture) {
- 98 string[idx++] = filechr(move->fromfile);
- 99 }
-100 } else if (piece != KING) {
-101 Move threats[16];
-102 uint8_t threatcount;
-103 get_real_threats(gamestate, move->torow, move->tofile,
-104 move->piece&COLOR_MASK, threats, &threatcount);
-105 if (threatcount > 1) {
-106 int ambrows = 0, ambfiles = 0;
-107 for (uint8_t i = 0 ; i < threatcount ; i++) {
-108 if (threats[i].fromrow == move->fromrow) {
-109 ambrows++;
-110 }
-111 if (threats[i].fromfile == move->fromfile) {
-112 ambfiles++;
-113 }
-114 }
-115
-116 if (ambrows > 1) {
-117 string[idx++] = filechr(move->fromfile);
-118 }
-119
-120 if (ambfiles > 1) {
-121 string[idx++] = filechr(move->fromrow);
-122 }
-123 }
-124 }
-125
-126
-127 if (move->capture) {
-128 string[idx++] = 'x';
-129 }
-130
-131
-132 string[idx++] = filechr(move->tofile);
-133 string[idx++] = rowchr(move->torow);
-134
-135
-136 if (move->promotion) {
-137 string[idx++] = '=';
-138 string[idx++] = getpiecechr(move->promotion);
-139 }
-140
-141
-142 if (move->check) {
-143
-144 string[idx++] = gamestate->checkmate?'#':'+';
-145 }
-146 }
-147
-148 static void addmove(GameState* gamestate, Move *move) {
-149 MoveList *elem = malloc(sizeof(MoveList));
-150 elem->next = NULL;
-151 elem->move = *move;
-152
-153 struct timeval curtimestamp;
-154 gettimeofday(&curtimestamp, NULL);
-155 elem->move.timestamp.tv_sec = curtimestamp.tv_sec;
-156 elem->move.timestamp.tv_usec = curtimestamp.tv_usec;
-157
-158 if (gamestate->lastmove) {
-159 struct movetimeval *lasttstamp = &(gamestate->lastmove->move.timestamp);
-160 uint64_t sec = curtimestamp.tv_sec - lasttstamp->tv_sec;
-161 suseconds_t micros;
-162 if (curtimestamp.tv_usec < lasttstamp->tv_usec) {
-163 micros = 1e6L-(lasttstamp->tv_usec - curtimestamp.tv_usec);
-164 sec--;
-165 } else {
-166 micros = curtimestamp.tv_usec - lasttstamp->tv_usec;
-167 }
-168
-169 elem->move.movetime.tv_sec = sec;
-170 elem->move.movetime.tv_usec = micros;
-171
-172 gamestate->lastmove->next = elem;
-173 gamestate->lastmove = elem;
-174 } else {
-175 elem->move.movetime.tv_usec = 0;
-176 elem->move.movetime.tv_sec = 0;
-177 gamestate->movelist = gamestate->lastmove = elem;
-178 }
-179 }
-180
-181 char getpiecechr(uint8_t piece) {
-182 switch (piece & PIECE_MASK) {
-183 case ROOK: return 'R';
-184 case KNIGHT: return 'N';
-185 case BISHOP: return 'B';
-186 case QUEEN: return 'Q';
-187 case KING: return 'K';
-188 default: return '\0';
-189 }
-190 }
-191
-192 uint8_t getpiece(char c) {
-193 switch (c) {
-194 case 'R': return ROOK;
-195 case 'N': return KNIGHT;
-196 case 'B': return BISHOP;
-197 case 'Q': return QUEEN;
-198 case 'K': return KING;
-199 default: return 0;
-200 }
-201 }
-202
-203 static void apply_move_impl(GameState *gamestate, Move *move, _Bool simulate) {
-204 uint8_t piece = move->piece & PIECE_MASK;
-205 uint8_t color = move->piece & COLOR_MASK;
-206
-207
-208 if (move->capture && piece == PAWN &&
-209 mdst(gamestate->board, move) == 0) {
-210 gamestate->board[move->fromrow][move->tofile] = 0;
-211 }
-212
-213
-214 for (uint8_t file = 0 ; file < 8 ; file++) {
-215 gamestate->board[3][file] &= ~ENPASSANT_THREAT;
-216 gamestate->board[4][file] &= ~ENPASSANT_THREAT;
-217 }
-218
-219
-220 if (piece == PAWN && (
-221 (move->fromrow == 1 && move->torow == 3) ||
-222 (move->fromrow == 6 && move->torow == 4))) {
-223 move->piece |= ENPASSANT_THREAT;
-224 }
-225
-226
-227 msrc(gamestate->board, move) = 0;
-228 if (move->promotion) {
-229 mdst(gamestate->board, move) = move->promotion;
-230 } else {
-231 mdst(gamestate->board, move) = move->piece;
-232 }
-233
-234
-235 if (piece == KING && move->fromfile == fileidx('e')) {
-236
-237 if (move->tofile == fileidx('g')) {
-238 gamestate->board[move->torow][fileidx('h')] = 0;
-239 gamestate->board[move->torow][fileidx('f')] = color|ROOK;
-240 } else if (move->tofile == fileidx('c')) {
-241 gamestate->board[move->torow][fileidx('a')] = 0;
-242 gamestate->board[move->torow][fileidx('d')] = color|ROOK;
-243 }
-244 }
-245
-246 if (!simulate) {
-247 if (!move->string[0]) {
-248 format_move(gamestate, move);
-249 }
-250 }
-251
-252 addmove(gamestate, move);
-253 }
-254
-255 void apply_move(GameState *gamestate, Move *move) {
-256 apply_move_impl(gamestate, move, 0);
-257 }
-258
-259 static int validate_move_rules(GameState *gamestate, Move *move) {
-260
-261 if (!chkidx(move)) {
-262 return INVALID_POSITION;
-263 }
-264
-265
-266 if (move->fromfile == move->tofile && move->fromrow == move->torow) {
-267 return INVALID_MOVE_SYNTAX;
-268 }
-269
-270
-271 if ((msrc(gamestate->board, move)&(PIECE_MASK|COLOR_MASK))
-272 != (move->piece&(PIECE_MASK|COLOR_MASK))) {
-273 return INVALID_POSITION;
-274 }
-275
-276
-277 if ((mdst(gamestate->board, move) & COLOR_MASK)
-278 == (move->piece & COLOR_MASK)) {
-279 return RULES_VIOLATED;
-280 }
-281
-282
-283 if ((mdst(gamestate->board, move) == 0 && move->capture) ||
-284 (mdst(gamestate->board, move) != 0 && !move->capture)) {
-285 return INVALID_MOVE_SYNTAX;
-286 }
-287
-288
-289 _Bool chkrules;
-290 switch (move->piece & PIECE_MASK) {
-291 case PAWN:
-292 chkrules = pawn_chkrules(gamestate, move) &&
-293 !pawn_isblocked(gamestate, move);
-294 break;
-295 case ROOK:
-296 chkrules = rook_chkrules(move) &&
-297 !rook_isblocked(gamestate, move);
-298 break;
-299 case KNIGHT:
-300 chkrules = knight_chkrules(move);
-301 break;
-302 case BISHOP:
-303 chkrules = bishop_chkrules(move) &&
-304 !bishop_isblocked(gamestate, move);
-305 break;
-306 case QUEEN:
-307 chkrules = queen_chkrules(move) &&
-308 !queen_isblocked(gamestate, move);
-309 break;
-310 case KING:
-311 chkrules = king_chkrules(gamestate, move) &&
-312 !king_isblocked(gamestate, move);
-313 break;
-314 default:
-315 return INVALID_MOVE_SYNTAX;
-316 }
-317
-318 return chkrules ? VALID_MOVE_SEMANTICS : RULES_VIOLATED;
-319 }
-320
-321 int validate_move(GameState *gamestate, Move *move) {
-322
-323 int result = validate_move_rules(gamestate, move);
-324
-325
-326 if (result != VALID_MOVE_SEMANTICS) {
-327 return result;
-328 }
-329
-330
-331 uint8_t piececolor = (move->piece & COLOR_MASK);
-332
-333 uint8_t mykingfile = 0, mykingrow = 0, opkingfile = 0, opkingrow = 0;
-334 for (uint8_t row = 0 ; row < 8 ; row++) {
-335 for (uint8_t file = 0 ; file < 8 ; file++) {
-336 if (gamestate->board[row][file] ==
-337 (piececolor == WHITE?WKING:BKING)) {
-338 mykingfile = file;
-339 mykingrow = row;
-340 } else if (gamestate->board[row][file] ==
-341 (piececolor == WHITE?BKING:WKING)) {
-342 opkingfile = file;
-343 opkingrow = row;
-344 }
-345 }
-346 }
-347
-348
-349 GameState simulation = gamestate_copy_sim(gamestate);
-350 Move simmove = *move;
-351 apply_move_impl(&simulation, &simmove, 1);
-352
-353
-354 if (is_covered(&simulation, mykingrow, mykingfile,
-355 opponent_color(piececolor))) {
-356
-357 gamestate_cleanup(&simulation);
-358 if ((move->piece & PIECE_MASK) == KING) {
-359 return KING_MOVES_INTO_CHECK;
-360 } else {
-361
-362 return gamestate->lastmove->move.check ?
-363 KING_IN_CHECK : PIECE_PINNED;
-364 }
-365 }
-366
-367
-368 Move threats[16];
-369 uint8_t threatcount;
-370 move->check = get_threats(&simulation, opkingrow, opkingfile,
-371 piececolor, threats, &threatcount);
-372
-373 if (move->check) {
-374
-375 _Bool canescape = 0;
-376 for (int dr = -1 ; dr <= 1 && !canescape ; dr++) {
-377 for (int df = -1 ; df <= 1 && !canescape ; df++) {
-378 if (!(dr == 0 && df == 0) &&
-379 isidx(opkingrow + dr) && isidx(opkingfile + df)) {
-380
-381
-382 if ((simulation.board[opkingrow + dr][opkingfile + df]
-383 & COLOR_MASK) != opponent_color(piececolor)) {
-384 canescape |= !is_covered(&simulation,
-385 opkingrow + dr, opkingfile + df, piececolor);
-386 }
-387 }
-388 }
-389 }
-390
-391 if (!canescape && threatcount == 1) {
-392 canescape = is_attacked(&simulation, threats[0].fromrow,
-393 threats[0].fromfile, opponent_color(piececolor));
-394 }
-395
-396
-397 if (!canescape && threatcount == 1) {
-398 Move *threat = &(threats[0]);
-399 uint8_t threatpiece = threat->piece & PIECE_MASK;
-400
-401
-402 if (threatpiece == BISHOP || threatpiece == ROOK
-403 || threatpiece == QUEEN) {
-404 if (threat->fromrow == threat->torow) {
-405
-406 int d = threat->tofile > threat->fromfile ? 1 : -1;
-407 uint8_t file = threat->fromfile;
-408 while (!canescape && file != threat->tofile - d) {
-409 file += d;
-410 canescape |= is_protected(&simulation,
-411 threat->torow, file, opponent_color(piececolor));
-412 }
-413 } else if (threat->fromfile == threat->tofile) {
-414
-415 int d = threat->torow > threat->fromrow ? 1 : -1;
-416 uint8_t row = threat->fromrow;
-417 while (!canescape && row != threat->torow - d) {
-418 row += d;
-419 canescape |= is_protected(&simulation,
-420 row, threat->tofile, opponent_color(piececolor));
-421 }
-422 } else {
-423
-424 int dr = threat->torow > threat->fromrow ? 1 : -1;
-425 int df = threat->tofile > threat->fromfile ? 1 : -1;
-426
-427 uint8_t row = threat->fromrow;
-428 uint8_t file = threat->fromfile;
-429 while (!canescape && file != threat->tofile - df
-430 && row != threat->torow - dr) {
-431 row += dr;
-432 file += df;
-433 canescape |= is_protected(&simulation, row, file,
-434 opponent_color(piececolor));
-435 }
-436 }
-437 }
-438 }
-439
-440 if (!canescape) {
-441 gamestate->checkmate = 1;
-442 }
-443 }
-444
-445 gamestate_cleanup(&simulation);
-446
-447 return VALID_MOVE_SEMANTICS;
-448 }
-449
-450 _Bool get_threats(GameState *gamestate, uint8_t row, uint8_t file,
-451 uint8_t color, Move *threats, uint8_t *threatcount) {
-452 Move candidates[32];
-453 int candidatecount = 0;
-454 for (uint8_t r = 0 ; r < 8 ; r++) {
-455 for (uint8_t f = 0 ; f < 8 ; f++) {
-456 if ((gamestate->board[r][f] & COLOR_MASK) == color) {
-457
-458 memset(&(candidates[candidatecount]), 0, sizeof(Move));
-459 candidates[candidatecount].piece = gamestate->board[r][f];
-460 candidates[candidatecount].fromrow = r;
-461 candidates[candidatecount].fromfile = f;
-462 candidates[candidatecount].torow = row;
-463 candidates[candidatecount].tofile = file;
-464 candidatecount++;
-465
-466
-467 memcpy(&(candidates[candidatecount]),
-468 &(candidates[candidatecount-1]), sizeof(Move));
-469 candidates[candidatecount].capture = 1;
-470 candidatecount++;
-471 }
-472 }
-473 }
-474
-475 if (threatcount) {
-476 *threatcount = 0;
-477 }
-478
-479
-480 _Bool result = 0;
-481
-482 for (int i = 0 ; i < candidatecount ; i++) {
-483 if (validate_move_rules(gamestate, &(candidates[i]))
-484 == VALID_MOVE_SEMANTICS) {
-485 result = 1;
-486 if (threats && threatcount) {
-487 threats[(*threatcount)++] = candidates[i];
-488 }
-489 }
-490 }
-491
-492 return result;
-493 }
-494
-495 _Bool is_pinned(GameState *gamestate, Move *move) {
-496 uint8_t color = move->piece & COLOR_MASK;
-497
-498 uint8_t kingfile = 0, kingrow = 0;
-499 for (uint8_t row = 0 ; row < 8 ; row++) {
-500 for (uint8_t file = 0 ; file < 8 ; file++) {
-501 if (gamestate->board[row][file] == (color|KING)) {
-502 kingfile = file;
-503 kingrow = row;
-504 }
-505 }
-506 }
-507
-508 GameState simulation = gamestate_copy_sim(gamestate);
-509 Move simmove = *move;
-510 apply_move(&simulation, &simmove);
-511 _Bool covered = is_covered(&simulation,
-512 kingrow, kingfile, opponent_color(color));
-513 gamestate_cleanup(&simulation);
-514
-515 return covered;
-516 }
-517
-518 _Bool get_real_threats(GameState *gamestate, uint8_t row, uint8_t file,
-519 uint8_t color, Move *threats, uint8_t *threatcount) {
-520
-521 if (threatcount) {
-522 *threatcount = 0;
-523 }
-524
-525 Move candidates[16];
-526 uint8_t candidatecount;
-527 if (get_threats(gamestate, row, file, color, candidates, &candidatecount)) {
-528
-529 _Bool result = 0;
-530 uint8_t kingfile = 0, kingrow = 0;
-531 for (uint8_t row = 0 ; row < 8 ; row++) {
-532 for (uint8_t file = 0 ; file < 8 ; file++) {
-533 if (gamestate->board[row][file] == (color|KING)) {
-534 kingfile = file;
-535 kingrow = row;
-536 }
-537 }
-538 }
-539
-540 for (uint8_t i = 0 ; i < candidatecount ; i++) {
-541 GameState simulation = gamestate_copy_sim(gamestate);
-542 Move simmove = candidates[i];
-543 apply_move(&simulation, &simmove);
-544 if (!is_covered(&simulation, kingrow, kingfile,
-545 opponent_color(color))) {
-546 result = 1;
-547 if (threats && threatcount) {
-548 threats[(*threatcount)++] = candidates[i];
-549 }
-550 }
-551 }
-552
-553 return result;
-554 } else {
-555 return 0;
-556 }
-557 }
-558
-559 static int getlocation(GameState *gamestate, Move *move) {
-560
-561 uint8_t color = move->piece & COLOR_MASK;
-562 _Bool incheck = gamestate->lastmove?gamestate->lastmove->move.check:0;
-563
-564 Move threats[16], *threat = NULL;
-565 uint8_t threatcount;
-566
-567 if (get_threats(gamestate, move->torow, move->tofile, color,
-568 threats, &threatcount)) {
-569
-570 int reason = INVALID_POSITION;
-571
-572
-573 for (uint8_t i = 0 ; i < threatcount ; i++) {
-574 if ((threats[i].piece & (PIECE_MASK | COLOR_MASK))
-575 == move->piece &&
-576 (move->fromrow == POS_UNSPECIFIED ||
-577 move->fromrow == threats[i].fromrow) &&
-578 (move->fromfile == POS_UNSPECIFIED ||
-579 move->fromfile == threats[i].fromfile)) {
-580
-581 if (threat) {
-582 return AMBIGUOUS_MOVE;
-583 } else {
-584
-585 if (is_pinned(gamestate, &(threats[i]))) {
-586 reason = incheck?KING_IN_CHECK:PIECE_PINNED;
-587 } else {
-588 threat = &(threats[i]);
-589 }
-590 }
-591 }
-592 }
-593
-594
-595 if (!threat) {
-596 return reason;
-597 }
-598
-599 memcpy(move, threat, sizeof(Move));
-600 return VALID_MOVE_SYNTAX;
-601 } else {
-602 return INVALID_POSITION;
-603 }
-604 }
-605
-606 int eval_move(GameState *gamestate, char *mstr, Move *move, uint8_t color) {
-607 memset(move, 0, sizeof(Move));
-608 move->fromfile = POS_UNSPECIFIED;
-609 move->fromrow = POS_UNSPECIFIED;
-610
-611 size_t len = strlen(mstr);
-612 if (len < 1 || len > 6) {
-613 return INVALID_MOVE_SYNTAX;
-614 }
-615
-616
-617 if (mstr[len-1] == '+') {
-618 len--; mstr[len] = '\0';
-619 move->check = 1;
-620 } else if (mstr[len-1] == '#') {
-621 len--; mstr[len] = '\0';
-622
-623 }
-624
-625
-626 if (len > 3 && mstr[len-2] == '=') {
-627 move->promotion = getpiece(mstr[len-1]);
-628 if (!move->promotion) {
-629 return INVALID_MOVE_SYNTAX;
-630 } else {
-631 move->promotion |= color;
-632 len -= 2;
-633 mstr[len] = 0;
-634 }
-635 }
-636
-637 if (len == 2) {
-638
-639 move->piece = PAWN;
-640 move->tofile = fileidx(mstr[0]);
-641 move->torow = rowidx(mstr[1]);
-642 } else if (len == 3) {
-643 if (strcmp(mstr, "O-O") == 0) {
-644
-645 move->piece = KING;
-646 move->fromfile = fileidx('e');
-647 move->tofile = fileidx('g');
-648 move->fromrow = move->torow = color == WHITE ? 0 : 7;
-649 } else {
-650
-651 move->piece = getpiece(mstr[0]);
-652 move->tofile = fileidx(mstr[1]);
-653 move->torow = rowidx(mstr[2]);
-654 }
-655 } else if (len == 4) {
-656 move->piece = getpiece(mstr[0]);
-657 if (!move->piece) {
-658 move->piece = PAWN;
-659 move->fromfile = fileidx(mstr[0]);
-660 }
-661 if (mstr[1] == 'x') {
-662
-663 move->capture = 1;
-664 } else {
-665
-666 if (isfile(mstr[1])) {
-667 move->fromfile = fileidx(mstr[1]);
-668 if (move->piece == PAWN) {
-669 move->piece = 0;
-670 }
-671 } else {
-672 move->fromrow = rowidx(mstr[1]);
-673 }
-674 }
-675 move->tofile = fileidx(mstr[2]);
-676 move->torow = rowidx(mstr[3]);
-677 } else if (len == 5) {
-678 if (strcmp(mstr, "O-O-O") == 0) {
-679
-680 move->piece = KING;
-681 move->fromfile = fileidx('e');
-682 move->tofile = fileidx('c');
-683 move->fromrow = move->torow = color == WHITE ? 0 : 7;
-684 } else {
-685 move->piece = getpiece(mstr[0]);
-686 if (mstr[2] == 'x') {
-687 move->capture = 1;
-688 if (move->piece) {
-689
-690 move->fromfile = fileidx(mstr[1]);
-691 } else {
-692
-693 move->piece = PAWN;
-694 move->fromfile = fileidx(mstr[0]);
-695 move->fromrow = rowidx(mstr[1]);
-696 }
-697 } else {
-698
-699 move->fromfile = fileidx(mstr[1]);
-700 move->fromrow = rowidx(mstr[2]);
-701 }
-702 move->tofile = fileidx(mstr[3]);
-703 move->torow = rowidx(mstr[4]);
-704 }
-705 } else if (len == 6) {
-706
-707 if (mstr[3] == 'x') {
-708 move->capture = 1;
-709 move->piece = getpiece(mstr[0]);
-710 move->fromfile = fileidx(mstr[1]);
-711 move->fromrow = rowidx(mstr[2]);
-712 move->tofile = fileidx(mstr[4]);
-713 move->torow = rowidx(mstr[5]);
-714 }
-715 }
-716
-717
-718 if (move->piece) {
-719 if (move->piece == PAWN
-720 && move->torow == (color==WHITE?7:0)
-721 && !move->promotion) {
-722 return NEED_PROMOTION;
-723 }
-724
-725 move->piece |= color;
-726 if (move->fromfile == POS_UNSPECIFIED
-727 || move->fromrow == POS_UNSPECIFIED) {
-728 return getlocation(gamestate, move);
-729 } else {
-730 return chkidx(move) ? VALID_MOVE_SYNTAX : INVALID_POSITION;
-731 }
-732 } else {
-733 return INVALID_MOVE_SYNTAX;
-734 }
-735 }
-736
-737 _Bool is_protected(GameState *gamestate, uint8_t row, uint8_t file,
-738 uint8_t color) {
-739
-740 Move threats[16];
-741 uint8_t threatcount;
-742 if (get_real_threats(gamestate, row, file, color, threats, &threatcount)) {
-743 for (int i = 0 ; i < threatcount ; i++) {
-744 if (threats[i].piece != (color|KING)) {
-745 return 1;
-746 }
-747 }
-748 return 0;
-749 } else {
-750 return 0;
-751 }
-752 }
-753
-754 uint16_t remaining_movetime(GameInfo *gameinfo, GameState *gamestate,
-755 uint8_t color) {
-756 if (!gameinfo->timecontrol) {
-757 return 0;
-758 }
-759
-760 if (gamestate->movelist) {
-761 uint16_t time = gameinfo->time;
-762 suseconds_t micros = 0;
-763
-764 MoveList *movelist = color == WHITE ?
-765 gamestate->movelist : gamestate->movelist->next;
-766
-767 while (movelist) {
-768 time += gameinfo->addtime;
-769
-770 struct movetimeval *movetime = &(movelist->move.movetime);
-771 if (movetime->tv_sec >= time) {
-772 return 0;
-773 }
-774
-775 time -= movetime->tv_sec;
-776 micros += movetime->tv_usec;
-777
-778 movelist = movelist->next ? movelist->next->next : NULL;
-779 }
-780
-781 time_t sec;
-782 movelist = gamestate->lastmove;
-783 if ((movelist->move.piece & COLOR_MASK) != color) {
-784 struct movetimeval *lastmovetstamp = &(movelist->move.timestamp);
-785 struct timeval currenttstamp;
-786 gettimeofday(¤ttstamp, NULL);
-787 micros += currenttstamp.tv_usec - lastmovetstamp->tv_usec;
-788 sec = currenttstamp.tv_sec - lastmovetstamp->tv_sec;
-789 if (sec >= time) {
-790 return 0;
-791 }
-792
-793 time -= sec;
-794 }
-795
-796 sec = micros / 1e6L;
-797
-798 if (sec >= time) {
-799 return 0;
-800 }
-801
-802 time -= sec;
-803
-804 return time;
-805 } else {
-806 return gameinfo->time;
-807 }
-808 }
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