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-rw-r--r--FICS/algcheck.c222
1 files changed, 122 insertions, 100 deletions
diff --git a/FICS/algcheck.c b/FICS/algcheck.c
index b92a64c..e53d1a3 100644
--- a/FICS/algcheck.c
+++ b/FICS/algcheck.c
@@ -194,110 +194,132 @@ PUBLIC int alg_is_move(char *mstr)
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)
+/*
+ * 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;
+ 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 (get_move_info(mstr, &piece, &ff, &fr, &tf, &tr, &bc) != MS_ALG) {
+ fprintf(stderr, "FICS: Shouldn't try to algebraically parse "
+ "non-algebraic move string.\n");
+ return MOVE_ILLEGAL;
+ }
- 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;
+ // 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) {
+ 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;
}
- }
- } 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;
+
+ 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;
}
/*
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-19 21:33:53 +0000