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+/* algcheck.c
+ *
+ */
+
+/*
+ fics - An internet chess server.
+ Copyright (C) 1993 Richard V. Nash
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+*/
+
+/* Revision history:
+ name email yy/mm/dd Change
+ Richard Nash 93/10/22 Created
+*/
+
+#include "stdinclude.h"
+
+#include "common.h"
+#include "algcheck.h"
+#include "movecheck.h"
+#include "board.h"
+#include "utils.h"
+
+/* Well, lets see if I can list the possibilities
+ * Piece moves
+ * Ne4
+ * Nxe4
+ * Nce4
+ * Ncxe4
+ * R2f3
+ * R2xf3
+ * Special pawn moves
+ * e4
+ * ed
+ * exd
+ * exd5
+ * ed5
+ * Drop moves (bughouse, board edit)
+ * P@f7 P*f7
+ * #f7 #Nf7
+ * (o-o, o-o-o) Castling is handled earlier, so don't worry about that
+ * Of course any of these can have a + or ++ or = string on the end, just
+ * cut that off.
+ */
+
+/* f - file
+ * r - rank
+ * p - piece
+ * x - x
+ * @ - drop character (bughouse)
+ */
+char *alg_list[] = {
+ "fxfr", "pxfr", /* These two get confused in case of bishop */
+ "ffr", "pfr", /* These two get confused in case of bishop */
+ "pffr",
+ "pfxfr",
+ "prfr",
+ "prxfr",
+ "fr",
+ "ff",
+ "fxf",
+ "p@fr",
+ "#fr",
+ "#pfr",
+ NULL
+};
+
+#define ALG_UNKNOWN -1
+/* #define ALG_DROP -2 IanO: this is in board.h, used in movecheck.c */
+
+PRIVATE int get_move_info(char *str, int *piece, int *ff, int *fr, int *tf, int *tr, int *bishconfusion)
+{
+ char tmp[1024];
+ char *s;
+ int i, j, len;
+ char c;
+ int matchVal = -1;
+ int lpiece, lff, lfr, ltf, ltr;
+
+ *bishconfusion = 0;
+ strcpy(tmp, str);
+ if ((s = index(tmp, '+'))) { /* Cut off any check marks */
+ *s = '\0';
+ }
+ if ((s = index(tmp, '='))) { /* Cut off any promotion marks */
+ *s = '\0';
+ }
+ *piece = *ff = *fr = *tf = *tr = ALG_UNKNOWN;
+ len = strlen(tmp);
+ for (i = 0; alg_list[i]; i++) {
+ lpiece = lff = lfr = ltf = ltr = ALG_UNKNOWN;
+ if (strlen(alg_list[i]) != len)
+ continue;
+ for (j = len - 1; j >= 0; j--) {
+ switch (alg_list[i][j]) {
+ case 'f':
+ if ((tmp[j] < 'a') || (tmp[j] > 'h'))
+ goto nomatch;
+ if (ltf == ALG_UNKNOWN)
+ ltf = tmp[j] - 'a';
+ else
+ lff = tmp[j] - 'a';
+ break;
+ case 'r':
+ if ((tmp[j] < '1') || (tmp[j] > '8'))
+ goto nomatch;
+ if (ltr == ALG_UNKNOWN)
+ ltr = tmp[j] - '1';
+ else
+ lfr = tmp[j] - '1';
+ break;
+ case 'p':
+ if (isupper(tmp[j]))
+ c = tolower(tmp[j]);
+ else
+ c = tmp[j];
+ if (c == 'k')
+ lpiece = KING;
+ else if (c == 'q')
+ lpiece = QUEEN;
+ else if (c == 'r')
+ lpiece = ROOK;
+ else if (c == 'b')
+ lpiece = BISHOP;
+ else if (c == 'n')
+ lpiece = KNIGHT;
+ else if (c == 'p')
+ lpiece = PAWN;
+ else
+ goto nomatch;
+ break;
+ case 'x':
+ if ((tmp[j] != 'x') && (tmp[j] != 'X'))
+ goto nomatch;
+ break;
+ case '@':
+ if (tmp[j] != '@' && tmp[j] != '*')
+ goto nomatch;
+ lff = lfr = ALG_DROP;
+ break;
+ case '#':
+ if (tmp[j] != '#')
+ goto nomatch;
+ lff = lfr = ALG_DROP;
+ break;
+ default:
+ fprintf(stderr, "Unknown character in algebraic parsing\n");
+ break;
+ }
+ }
+ if (lpiece == ALG_UNKNOWN)
+ lpiece = PAWN;
+ if (lpiece == PAWN && (lfr == ALG_UNKNOWN)) { /* ffr or ff */
+ if (lff != ALG_UNKNOWN) {
+ if (lff == ltf)
+ goto nomatch;
+ if ((lff - ltf != 1) && (ltf - lff != 1))
+ goto nomatch;
+ }
+ }
+ *piece = lpiece; /* We have a match */
+ *tf = ltf;
+ *tr = ltr;
+ *ff = lff;
+ *fr = lfr;
+ if (matchVal != -1) {
+ /* We have two matches, it must be that Bxc4 vs. bxc4 problem */
+ /* Or it could be the Bc4 vs bc4 problem */
+ *bishconfusion = 1;
+ }
+ matchVal = i;
+nomatch:;
+ }
+ if (matchVal != -1)
+ return MS_ALG;
+ else
+ return MS_NOTMOVE;
+}
+
+PUBLIC int alg_is_move(char *mstr)
+{
+ int piece, ff, fr, tf, tr, bc;
+
+ return get_move_info(mstr, &piece, &ff, &fr, &tf, &tr, &bc);
+}
+
+/* We already know it is algebraic, get the move squares */
+PUBLIC int alg_parse_move(char *mstr, game_state_t * gs, move_t * mt)
+{
+ int f, r, tmpr, posf, posr, posr2;
+ int piece, ff, fr, tf, tr, bc;
+
+ if (get_move_info(mstr, &piece, &ff, &fr, &tf, &tr, &bc) != MS_ALG) {
+ fprintf(stderr, "FICS: Shouldn't try to algebraicly parse non-algabraic move string.\n");
+ return MOVE_ILLEGAL;
+ }
+ /* Resolve ambiguities in to-ness */
+ if (tf == ALG_UNKNOWN)
+ return MOVE_AMBIGUOUS; /* Must always know to file */
+ if (tr == ALG_UNKNOWN) {
+ posr = posr2 = ALG_UNKNOWN;
+ if (piece != PAWN)
+ return MOVE_AMBIGUOUS;
+ if (ff == ALG_UNKNOWN)
+ return MOVE_AMBIGUOUS;
+ /* Need to find pawn on ff that can take to tf and fill in ranks */
+ for (InitPieceLoop(gs->board, &f, &r, gs->onMove);
+ NextPieceLoop(gs->board, &f, &r, gs->onMove);) {
+ if ((ff != ALG_UNKNOWN) && (ff != f))
+ continue;
+ if (piecetype(gs->board[f][r]) != piece)
+ continue;
+ if (gs->onMove == WHITE) {
+ tmpr = r + 1;
+ } else {
+ tmpr = r - 1;
+ }
+/* if ((gs->board[tf][tmpr] == NOPIECE) ||
+ (iscolor(gs->board[tf][tmpr], gs->onMove))) continue;*/
+/* patch from Soso, added by Sparky 3/16/95 */
+ if (gs->board[tf][tmpr] == NOPIECE) {
+ if ((gs->ep_possible[((gs->onMove == WHITE) ? 0 : 1)][ff]) != (tf - ff))
+ continue;
+ } else {
+ if (iscolor(gs->board[tf][tmpr], gs->onMove))
+ continue;
+ }
+
+ if (legal_andcheck_move(gs, f, r, tf, tmpr)) {
+ if ((posr != ALG_UNKNOWN) && (posr2 != ALG_UNKNOWN))
+ return MOVE_AMBIGUOUS;
+ posr = tmpr;
+ posr2 = r;
+ }
+ }
+ tr = posr;
+ fr = posr2;
+ } else if (bc) { /* Could be bxc4 or Bxc4, tr is known */
+ ff = ALG_UNKNOWN;
+ fr = ALG_UNKNOWN;
+ for (InitPieceLoop(gs->board, &f, &r, gs->onMove);
+ NextPieceLoop(gs->board, &f, &r, gs->onMove);) {
+ if ((piecetype(gs->board[f][r]) != PAWN) && (piecetype(gs->board[f][r]) != BISHOP))
+ continue;
+ if (legal_andcheck_move(gs, f, r, tf, tr)) {
+ if ((piecetype(gs->board[f][r]) == PAWN) && (f != 1))
+ continue;
+ if ((ff != ALG_UNKNOWN) && (fr != ALG_UNKNOWN))
+ return (MOVE_AMBIGUOUS);
+ ff = f;
+ fr = r;
+ }
+ }
+ } else { /* The from position is unknown */
+ posf = ALG_UNKNOWN;
+ posr = ALG_UNKNOWN;
+ if ((ff == ALG_UNKNOWN) || (fr == ALG_UNKNOWN)) {
+ /* Need to find a piece that can go to tf, tr */
+ for (InitPieceLoop(gs->board, &f, &r, gs->onMove);
+ NextPieceLoop(gs->board, &f, &r, gs->onMove);) {
+ if ((ff != ALG_UNKNOWN) && (ff != f))
+ continue;
+ if ((fr != ALG_UNKNOWN) && (fr != r))
+ continue;
+ if (piecetype(gs->board[f][r]) != piece)
+ continue;
+ if (legal_andcheck_move(gs, f, r, tf, tr)) {
+ if ((posf != ALG_UNKNOWN) && (posr != ALG_UNKNOWN))
+ return MOVE_AMBIGUOUS;
+ posf = f;
+ posr = r;
+ }
+ }
+ } else if (ff == ALG_DROP) {
+ if (legal_andcheck_move(gs, ALG_DROP, piece, tf, tr)) {
+ posf = ALG_DROP;
+ posr = piece;
+ }
+ }
+ ff = posf;
+ fr = posr;
+ }
+ if ((tf == ALG_UNKNOWN) || (tr == ALG_UNKNOWN) ||
+ (ff == ALG_UNKNOWN) || (fr == ALG_UNKNOWN))
+ return MOVE_ILLEGAL;
+ mt->fromFile = ff;
+ mt->fromRank = fr;
+ mt->toFile = tf;
+ mt->toRank = tr;
+ return MOVE_OK;
+}
+
+/* A assumes the move has yet to be made on the board */
+/* this is the old stupid function, we are testing one from soso...
+PUBLIC char *alg_unparse( game_state_t *gs, move_t *mt )
+{
+ static char mStr[20];
+
+ if ((piecetype(gs->board[mt->fromFile][mt->fromRank]) == KING) &&
+ ((mt->fromFile == 4) && (mt->toFile == 6)) )
+ return "o-o";
+ if ((piecetype(gs->board[mt->fromFile][mt->fromRank]) == KING) &&
+ ((mt->fromFile == 4) && (mt->toFile == 2)) )
+ return "o-o-o";
+
+ sprintf( mStr, "%c%d%c%d", mt->fromFile+'a', mt->fromRank+1,
+ mt->toFile+'a', mt->toRank+1 );
+ return mStr;
+}
+*/
+
+
+/* A assumes the move has yet to be made on the board */
+
+
+/* Soso: rewrote alg_unparse function.
+ * Algebraic deparser - sets the mStr variable with move description
+ * in short notation. Used in last move report and in 'moves' command.
+ */
+
+PUBLIC char *alg_unparse(game_state_t * gs, move_t * mt)
+{
+ static char mStr[20];
+ char tmp[20];
+ int piece, f, r;
+ int ambig, r_ambig, f_ambig;
+ game_state_t fakeMove;
+
+ if (mt->fromFile == ALG_DROP) {
+ piece = mt->fromRank;
+ } else {
+ piece = piecetype(gs->board[mt->fromFile][mt->fromRank]);
+ }
+
+ if ((piece == KING) && ((mt->fromFile == 4) && (mt->toFile == 6))) {
+ strcpy(mStr, "O-O");
+ goto check;
+ }
+ if ((piece == KING) && ((mt->fromFile == 4) && (mt->toFile == 2))) {
+ strcpy(mStr, "O-O-O");
+ goto check;
+ }
+ strcpy(mStr, "");
+ switch (piece) {
+ case PAWN:
+ if (mt->fromFile == ALG_DROP) {
+ strcpy(mStr,"P");
+ } else if (mt->fromFile != mt->toFile) {
+ sprintf(tmp, "%c", mt->fromFile + 'a');
+ strcpy(mStr, tmp);
+ }
+ break;
+ case KNIGHT:
+ strcpy(mStr, "N");
+ break;
+ case BISHOP:
+ strcpy(mStr, "B");
+ break;
+ case ROOK:
+ strcpy(mStr, "R");
+ break;
+ case QUEEN:
+ strcpy(mStr, "Q");
+ break;
+ case KING:
+ strcpy(mStr, "K");
+ break;
+ default:
+ strcpy(mStr, "");
+ break;
+ }
+
+ if (mt->fromFile == ALG_DROP) {
+ strcat(mStr, DROP_STR);
+ } else {
+ /* Checks for ambiguity in short notation ( Ncb3, R8e8 or so) */
+ if (piece != PAWN) {
+ ambig = r_ambig = f_ambig = 0;
+ for (r = 0; r < 8; r++)
+ for (f = 0; f < 8; f++) {
+ if ((gs->board[f][r] != NOPIECE) && iscolor(gs->board[f][r], gs->onMove)
+ && (piecetype(gs->board[f][r]) == piece) &&
+ ((f != mt->fromFile) || (r != mt->fromRank))) {
+ if (legal_move(gs, f, r, mt->toFile, mt->toRank)) {
+ fakeMove = *gs;
+ fakeMove.board[f][r] = NOPIECE;
+ fakeMove.onMove = CToggle(fakeMove.onMove);
+ gs->onMove = CToggle(gs->onMove);
+
+ /* New bracketing below to try to fix 'ambiguous move' bug. */
+ if ((in_check(gs)) || !in_check(&fakeMove)) {
+ ambig++;
+ }
+ if (f == mt->fromFile) {
+ f_ambig++;
+ ambig++;
+ }
+ if (r == mt->fromRank) {
+ r_ambig++;
+ ambig++;
+ }
+ gs->onMove = CToggle(gs->onMove);
+ }
+ }
+ }
+ if (ambig > 0) {
+ /* Ambiguity in short notation, need to add file,rank or _both_ in
+ notation */
+ if (f_ambig == 0) {
+ sprintf(tmp, "%c", mt->fromFile + 'a');
+ strcat(mStr, tmp);
+ } else if (r_ambig == 0) {
+ sprintf(tmp, "%d", mt->fromRank + 1);
+ strcat(mStr, tmp);
+ } else {
+ sprintf(tmp, "%c%d", mt->fromFile + 'a', mt->fromRank + 1);
+ strcat(mStr, tmp);
+ }
+ }
+ }
+ if ((gs->board[mt->toFile][mt->toRank] != NOPIECE) ||
+ ((piece == PAWN) && (mt->fromFile != mt->toFile))) {
+ strcat(mStr, "x");
+ }
+ }
+ sprintf(tmp, "%c%d", mt->toFile + 'a', mt->toRank + 1);
+ strcat(mStr, tmp);
+
+ if ((piece == PAWN) && (mt->piecePromotionTo != NOPIECE)) {
+ strcat(mStr, "="); /* = before promoting piece */
+ switch (piecetype(mt->piecePromotionTo)) {
+ case KNIGHT:
+ strcat(mStr, "N");
+ break;
+ case BISHOP:
+ strcat(mStr, "B");
+ break;
+ case ROOK:
+ strcat(mStr, "R");
+ break;
+ case QUEEN:
+ strcat(mStr, "Q");
+ break;
+ default:
+ break;
+ }
+ }
+check:;
+ fakeMove = *gs;
+ execute_move(&fakeMove, mt, 0);
+ fakeMove.onMove = CToggle(fakeMove.onMove);
+ if (in_check(&fakeMove)) {
+ strcat(mStr, "+");
+ }
+ return mStr;
+}
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