sol.c

   1 #define _DEFAULT_SOURCE /* for getopt, sigaction, usleep */
   2 #include <poll.h>
   3 #include <signal.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <sys/ioctl.h>
   7 #include <time.h>
   8 #include <termios.h>
   9 #include <unistd.h>
  10
  11 #include "sol.h"
  12 #include "schemes.h"
  13
  14 struct playfield f;
  15 struct opts op;
  16
  17 // action table {{{
  18 /* stores a function pointer for every takeable action; called by game loop */
  19 int (*action[NUM_PLACES][10])(int,int,int) = {
  20 #ifdef KLONDIKE
  21         /* 1    2    3    4    5    6    7   stk  wst  fnd*/
  22 /* 1 */ { t2f, t2t, t2t, t2t, t2t, t2t, t2t, nop, nop, t2f },
  23 /* 2 */ { t2t, t2f, t2t, t2t, t2t, t2t, t2t, nop, nop, t2f },
  24 /* 3 */ { t2t, t2t, t2f, t2t, t2t, t2t, t2t, nop, nop, t2f },
  25 /* 4 */ { t2t, t2t, t2t, t2f, t2t, t2t, t2t, nop, nop, t2f },
  26 /* 5 */ { t2t, t2t, t2t, t2t, t2f, t2t, t2t, nop, nop, t2f },
  27 /* 6 */ { t2t, t2t, t2t, t2t, t2t, t2f, t2t, nop, nop, t2f },
  28 /* 7 */ { t2t, t2t, t2t, t2t, t2t, t2t, t2f, nop, nop, t2f },
  29 /*stk*/ { nop, nop, nop, nop, nop, nop, nop, nop, s2w, nop },
  30 /*wst*/ { w2t, w2t, w2t, w2t, w2t, w2t, w2t, w2s, w2f, w2f },
  31 /*fnd*/ { f2t, f2t, f2t, f2t, f2t, f2t, f2t, nop, nop, nop },
  32 #elif defined SPIDER
  33         /* 1    2    3    4    5    6    7    8    9    10*/
  34 /* 1 */ { t2f, t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2t },
  35 /* 2 */ { t2t, t2f, t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2t },
  36 /* 3 */ { t2t, t2t, t2f, t2t, t2t, t2t, t2t, t2t, t2t, t2t },
  37 /* 4 */ { t2t, t2t, t2t, t2f, t2t, t2t, t2t, t2t, t2t, t2t },
  38 /* 5 */ { t2t, t2t, t2t, t2t, t2f, t2t, t2t, t2t, t2t, t2t },
  39 /* 6 */ { t2t, t2t, t2t, t2t, t2t, t2f, t2t, t2t, t2t, t2t },
  40 /* 7 */ { t2t, t2t, t2t, t2t, t2t, t2t, t2f, t2t, t2t, t2t },
  41 /* 8 */ { t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2f, t2t, t2t },
  42 /* 9 */ { t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2f, t2t },
  43 /*10 */ { t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2t, t2f },
  44 /*stk*/ { s2t, s2t, s2t, s2t, s2t, s2t, s2t, s2t, s2t, s2t },
  45 #endif
  46 };
  47 // }}}
  48
  49 // argv parsing, game loops, cleanup {{{
  50 int main(int argc, char** argv) {
  51         /* opinionated defaults: */
  52         op.s = &unicode_large_color;
  53 #ifdef SPIDER
  54         op.m = MEDIUM;
  55 #endif
  56
  57         int optget;
  58         opterr = 0; /* don't print message on unrecognized option */
  59         while ((optget = getopt (argc, argv, "+:hs:vbcm")) != -1) {
  60                 switch (optget) {
  61 #ifdef SPIDER
  62                 case 's': /* number of suits */
  63                         switch (optarg[0]) {
  64                         case '1': op.m = EASY; break;
  65                         case '2': op.m = MEDIUM; break;
  66                         case '4': op.m = NORMAL; break;
  67                         default: goto error;
  68                         } break;
  69 #endif
  70                 case 'b': op.s = &unicode_large_mono; break;
  71                 case 'c': op.s = &unicode_large_color; break;
  72                 case 'm': op.s = &unicode_small_mono; break; /* "mini" */
  73                 case 'h': default: goto error;
  74                 error:
  75                         fprintf (stderr, SHORTHELP LONGHELP KEYHELP, argv[0]);
  76                         return optget != 'h';
  77                 }
  78         }
  79
  80         signal_setup();
  81         atexit (*quit);
  82
  83         signal_handler(SIGWINCH); /* initialize window size */
  84
  85 newgame:
  86         screen_setup(1);
  87
  88         switch(sol()) {
  89         case GAME_NEW: goto newgame;
  90         case GAME_WON:
  91                 print_table(NO_HI, NO_HI);
  92                 win_anim();
  93                 if (getch(NULL)=='q') return 0;
  94                 goto newgame;
  95         case GAME_QUIT: return 0;
  96         }
  97 }
  98
  99 int sol(void) {
 100         int ret;
 101         long seed = time(NULL);
 102 restart:
 103         free_undo(f.u);
 104         deal(seed);
 105
 106         int from, to, opt;
 107         for(;;) {
 108                 switch (get_cmd(&from, &to, &opt)) {
 109                 case CMD_MOVE:
 110                         ret = action[from][to](from,to,opt);
 111                         if (ret == ERR) /* try again with from/to swapped: */
 112                                 ret = action[to][from](to,from,opt);
 113                         switch (ret) {
 114                         case OK:  break;
 115                         case ERR: visbell(); break;
 116                         case WON: return GAME_WON;
 117                         }
 118                         break;
 119                 case CMD_JOIN:
 120                         switch (join(to)) {
 121                         case OK:  break;
 122                         case ERR: visbell(); break;
 123                         case WON: return GAME_WON;
 124                         }
 125                         break;
 126                 case CMD_HINT:  break;//TODO: show a possible (and sensible) move. if possible, involve active cursor
 127                 case CMD_UNDO:  undo_pop(f.u); break;
 128                 case CMD_INVAL: visbell(); break;
 129                 case CMD_NEW:   return GAME_NEW;
 130                 case CMD_AGAIN: goto restart;
 131                 case CMD_QUIT:  return GAME_QUIT;
 132                 case CMD_HELP: printf (KEYHELP "\nPress any key to continue."); getch(NULL);break;
 133                 }
 134         }
 135 }
 136
 137 void quit(void) {
 138         screen_setup(0);
 139         free_undo(f.u);
 140 }
 141 //}}}
 142
 143 // card games helper functions {{{
 144 #define get_suit(card) \
 145         ((card-1) % NUM_SUITS)
 146 #define get_rank(card) \
 147         ((card-1) / NUM_SUITS)
 148 #define get_color(card) \
 149         ((get_suit(card) ^ get_suit(card)>>1) & 1)
 150
 151 #define is_tableu(where) (where <= TAB_MAX)
 152
 153 int find_top(card_t* pile) {
 154         int i;
 155         for(i=PILE_SIZE-1; i>=0 && !pile[i]; i--);
 156         return i;
 157 }
 158 int first_movable(card_t* pile) {
 159         int i = 0;
 160         for (;pile[i] && !is_movable(pile, i); i++);
 161         return i;
 162 }
 163 int turn_over(card_t* pile) {
 164         int top = find_top(pile);
 165         if (pile[top] < 0) {
 166                 pile[top] *= -1;
 167                 return 1;
 168         } else return 0;
 169 }
 170 int check_won(void) {
 171         for (int pile = 0; pile < NUM_DECKS*NUM_SUITS; pile++)
 172                 if (f.f[pile][NUM_RANKS-1] == NO_CARD) return 0;
 173
 174         return 1;
 175 }
 176 int rank_next (card_t a, card_t b) {
 177         return get_rank(a) == get_rank(b)-1;
 178 }
 179 int is_consecutive (card_t* pile, int pos) {
 180         if (pos+1 >= PILE_SIZE) return 1; /* card is last */
 181         if (pile[pos+1] == NO_CARD) return 1; /* card is first */
 182
 183 #ifdef KLONDIKE
 184         /* ranks consecutive? */
 185         if (!rank_next(pile[pos+1], pile[pos])) return 0;
 186         /* color opposite? */
 187         if (get_color(pile[pos+1]) == get_color(pile[pos])) return 0;
 188 #elif defined SPIDER
 189         /* ranks consecutive? */
 190         if (!rank_next(pile[pos+1], pile[pos])) return 0;
 191         /* same suit? */
 192         if (get_suit(pile[pos+1]) != get_suit(pile[pos])) return 0;
 193 #endif
 194
 195         return 1;
 196 }
 197
 198 int is_movable(card_t* pile, int n) {
 199 #ifdef KLONDIKE
 200         return(pile[n] > NO_CARD); /*non-movable cards don't exist in klondike*/
 201 #elif defined SPIDER
 202         int top = find_top(pile);
 203         for (int i = top; i >= 0; i--) {
 204                 if (pile[i] <= NO_CARD) return 0; /*no card or card face down?*/
 205                 if (!is_consecutive(pile, i)) return 0;
 206                 if (i == n) return 1; /* card reached, must be movable */
 207         }
 208         return 0;
 209 #endif
 210 }
 211 //}}}
 212
 213 // takeable actions {{{
 214 #ifdef KLONDIKE
 215 card_t stack_take(void) { /*NOTE: assert(f.w >= 0) */
 216         card_t card = f.s[f.w];
 217         /* move stack one over, so there are no gaps in it: */
 218         for (int i = f.w; i < f.z-1; i++)
 219                 f.s[i] = f.s[i+1];
 220         f.z--;
 221         f.w--; /* make previous card visible again */
 222         return card;
 223 }
 224 int t2f(int from, int to, int opt) { /* tableu to foundation */
 225         (void) to; (void) opt; /* don't need */
 226         int top_from = find_top(f.t[from]);
 227         to = get_suit(f.t[from][top_from]);
 228         int top_to   = find_top(f.f[to]);
 229         if ((top_to < 0 && get_rank(f.t[from][top_from]) == RANK_A)
 230         || (top_to >= 0 && rank_next(f.f[to][top_to],f.t[from][top_from]))) {
 231                 f.f[to][top_to+1] = f.t[from][top_from];
 232                 f.t[from][top_from] = NO_CARD;
 233                 undo_push(from, FOUNDATION, to,
 234                 turn_over(f.t[from]));
 235                 if (check_won()) return WON;
 236                 return OK;
 237         } else return ERR;
 238 }
 239 int w2f(int from, int to, int opt) { /* waste to foundation */
 240         (void) from; (void) to; (void) opt; /* don't need */
 241         if (f.w < 0) return ERR;
 242         to = get_suit(f.s[f.w]);
 243         int top_to = find_top(f.f[to]);
 244         if ((top_to < 0 && get_rank(f.s[f.w]) == RANK_A)
 245         || (top_to >= 0 && rank_next(f.f[to][top_to], f.s[f.w]))) {
 246                 undo_push(WASTE, FOUNDATION, f.w | to<<16, 0);//ugly encoding :|
 247                 f.f[to][top_to+1] = stack_take();
 248                 if (check_won()) return WON;
 249                 return OK;
 250         } else return ERR;
 251
 252 }
 253 int s2w(int from, int to, int opt) { /* stock to waste */
 254         (void) from; (void) to; (void) opt; /* don't need */
 255         if (f.z == 0) return ERR;
 256         f.w++;
 257         if (f.w == f.z) f.w = -1;
 258         return OK;
 259 }
 260 int w2s(int from, int to, int opt) { /* waste to stock (undo stock to waste) */
 261         (void) from; (void) to; (void) opt; /* don't need */
 262         if (f.z == 0) return ERR;
 263         f.w--;
 264         if (f.w < -1) f.w = f.z-1;
 265         return OK;
 266 }
 267 int f2t(int from, int to, int opt) { /* foundation to tableu */
 268         (void) from; /* don't need */
 269         int top_to = find_top(f.t[to]);
 270         from = opt;
 271         int top_from = find_top(f.f[from]);
 272
 273         if ((get_color(f.t[to][top_to]) != get_color(f.f[from][top_from]))
 274         && (rank_next(f.f[from][top_from], f.t[to][top_to]))) {
 275                 f.t[to][top_to+1] = f.f[from][top_from];
 276                 f.f[from][top_from] = NO_CARD;
 277                 undo_push(FOUNDATION, to, from, 0);
 278                 return OK;
 279         } else return ERR;
 280 }
 281 int w2t(int from, int to, int opt) { /* waste to tableu */
 282         (void) from; (void) opt; /* don't need */
 283         int top_to = find_top(f.t[to]);
 284         if (((get_color(f.t[to][top_to]) != get_color(f.s[f.w]))
 285            && (rank_next(f.s[f.w], f.t[to][top_to])))
 286         || (top_to < 0 && get_rank(f.s[f.w]) == RANK_K)) {
 287                 undo_push(WASTE, to, f.w, 0);
 288                 f.t[to][top_to+1] = stack_take();
 289                 return OK;
 290         } else return ERR;
 291 }
 292 int t2t(int from, int to, int opt) { /* tableu to tableu */
 293         (void) opt; /* don't need */
 294         int top_to = find_top(f.t[to]);
 295         int top_from = find_top(f.t[from]);
 296         int count = 0; //NOTE: could probably be factored out
 297         for (int i = top_from; i >=0; i--) {
 298                 if (((get_color(f.t[to][top_to]) != get_color(f.t[from][i]))
 299                    && (rank_next(f.t[from][i], f.t[to][top_to]))
 300                    && f.t[from][i] > NO_CARD) /* card face up? */
 301                 || (top_to < 0 && get_rank(f.t[from][i]) == RANK_K)) {
 302                         /* move cards [i..top_from] to their destination */
 303                         for (;i <= top_from; i++) {
 304                                 top_to++;
 305                                 f.t[to][top_to] = f.t[from][i];
 306                                 f.t[from][i] = NO_CARD;
 307                                 count++;
 308                         }
 309                         undo_push(from, to, count,
 310                         turn_over(f.t[from]));
 311                         return OK;
 312                 }
 313         }
 314         return ERR; /* no such move possible */
 315 }
 316 #elif defined SPIDER
 317 int remove_if_complete (int pileno) { //cleanup!
 318         card_t* pile = f.t[pileno];
 319         /* test if K...A complete; move to foundation if so */
 320         int top_from = find_top(pile);
 321         if (get_rank(pile[top_from]) != RANK_A) return 0;
 322         for (int i = top_from; i>=0; i--) {
 323                 if (!is_consecutive (pile, i)) return 0;
 324                 if (i+RANK_K == top_from /* if ace to king: remove it */
 325                     && get_rank(pile[top_from-RANK_K]) == RANK_K) {
 326                         for(int i=top_from, j=0; i>top_from-NUM_RANKS; i--,j++){
 327                                 f.f[f.w][j] = pile[i];
 328                                 pile[i] = NO_CARD;
 329                         }
 330                         undo_push(pileno, FOUNDATION, f.w,
 331                         turn_over(pile));
 332                         f.w++;
 333                         return 1;
 334                 }
 335         }
 336
 337         return 0;
 338 }
 339 int t2t(int from, int to, int opt) { //in dire need of cleanup
 340         int top_from = find_top(f.t[from]);
 341         int top_to = find_top(f.t[to]);
 342         int empty_to = (top_to < 0)? opt: -1; /* empty pile? */
 343         int count = 0; //NOTE: could probably be factored out
 344
 345         for (int i = top_from; i >= 0; i--) {
 346                 if (!is_consecutive(f.t[from], i)) break;
 347
 348                 /* is consecutive OR to empty pile and rank ok? */
 349                 if (rank_next(f.t[from][i], f.t[to][top_to])
 350                 || (empty_to >= RANK_A && get_rank(f.t[from][i]) == empty_to)) {
 351                         for (;i <= top_from; i++) {
 352                                 top_to++;
 353                                 f.t[to][top_to] = f.t[from][i];
 354                                 f.t[from][i] = NO_CARD;
 355                                 count++;
 356                         }
 357                         undo_push(from, to, count,
 358                         turn_over(f.t[from]));
 359                         remove_if_complete(to);
 360                         if (check_won()) return WON;
 361                         return OK;
 362                 }
 363         }
 364
 365         return ERR; /* no such move possible */
 366 }
 367 int s2t(int from, int to, int opt) {
 368         (void) from; (void) to; (void) opt; /* don't need */
 369         if (f.z <= 0) return ERR; /* stack out of cards */
 370         for (int pile = 0; pile < NUM_PILES; pile++)
 371                 if (f.t[pile][0]==NO_CARD) return ERR; /*no piles may be empty*/
 372         for (int pile = 0; pile < NUM_PILES; pile++) {
 373                 f.t[pile][find_top(f.t[pile])+1] = f.s[--f.z];
 374                 remove_if_complete(pile);
 375                 if (check_won()) return WON;
 376         }
 377         undo_push(STOCK, TABLEU, 1, 0);/*NOTE: puts 1 card on each tableu pile*/
 378         return OK;
 379 }
 380 int t2f(int from, int to, int opt) {
 381         (void) to; (void) opt; /* don't need */
 382         /* manually retrigger remove_if_complete() (e.g. after undo_pop) */
 383         return remove_if_complete(from)?OK:ERR;
 384 }
 385 #endif
 386 //TODO: generalize prediction engine for CMD_HINT
 387 #ifdef KLONDIKE
 388 #define would_complete(pile) 0
 389 #elif defined SPIDER
 390 #define would_complete(pile) \
 391         (get_rank(f.t[pile][r[pile].top]) == RANK_A \
 392         && get_rank(f.t[to][bottom_to]) == RANK_K)
 393 #endif
 394 #define would_turn(pile) \
 395         (f.t[pile][r[pile].pos-1] < 0)
 396 #define would_empty(pile) \
 397         (r[pile].pos == 0)
 398
 399 int join(int to) {
 400         int top_to = find_top(f.t[to]);
 401 #ifdef SPIDER
 402         int bottom_to = first_movable(f.t[to]);
 403 #endif
 404
 405 #ifdef KLONDIKE
 406         if (to == FOUNDATION) {
 407                 int status = ERR;
 408                 for (int i = 0; i <= TAB_MAX; i++)
 409                         switch ((i?t2f:w2f)(i-1, FOUNDATION, 0)) {
 410                         case WON: return WON;
 411                         case OK:  status = OK;
 412                         case ERR: /* nop */;
 413                         }
 414                 return status;
 415         }
 416
 417         if (top_to < 0) { /* move a king to empty pile: */
 418                 for (int i = 0; i < TAB_MAX; i++) {
 419                         if (f.t[i][0] < 0) /* i.e. would turn? */ //TODO: this calculation is wrong!
 420                                 //DOES NOT FIRE when king is in the middle
 421                                 if (t2t(i, to, 0) == OK) return OK;
 422                 }
 423                 return w2t(WASTE, to, 0);
 424         }
 425 #endif
 426
 427         struct rating {
 428                 int ok:1;    /* card to move in pile? */
 429                 int above;   /* number of movable cards above */
 430                 int below;   /* number of cards below ours */
 431                 int pos;     /* where the card to move is in the pile */
 432                 int top;     /* find_top() */
 433         } r[NUM_PILES] = {{0}};
 434         int complete = 0;/* SPIDER: true if any pile would complete a stack */
 435         int turn =  0; /* SPIDER: true if any pile would turn_over */
 436         int empty = 0; /* true if any pile would become empty */
 437
 438         /* 1. rate each pile: */
 439 #ifdef SPIDER
 440         if (top_to < 0) {
 441                 for (int pile = 0; pile < NUM_PILES; pile++) {
 442                         if (pile == to) continue;
 443                         int top = find_top(f.t[pile]);
 444                         int bottom = first_movable(f.t[pile]);
 445                         r[pile].pos = bottom; /* need for would_empty */
 446
 447                         if (top < 0) continue; /* no cards to move */
 448                         if (would_empty(pile)) continue; /* doesn't help */
 449
 450                         r[pile].ok++;
 451                         r[pile].above = 0; /* always take as many as possible */
 452                         r[pile].below = top - bottom;
 453                         r[pile].top = top;
 454                         complete |= would_complete(pile); /* never happens */
 455                         turn     |= would_turn(pile);
 456                         empty    |= would_empty(pile);
 457                 }
 458         } else
 459 #endif
 460         for (int pile = 0; pile < NUM_PILES; pile++) {
 461                 r[pile].top = r[pile].pos = find_top(f.t[pile]);
 462                 /* backtrack until we find a compatible-to-'to'-pile card: */
 463                 while (r[pile].pos >= 0 && is_movable(f.t[pile], r[pile].pos)) {
 464                         int rankdiff = get_rank(f.t[pile][r[pile].pos])
 465                                        - get_rank(f.t[to][top_to]);
 466                         if (rankdiff >= 0) break; /* past our card */
 467                         if (rankdiff == -1 /* rank matches */
 468 #ifdef KLONDIKE
 469                         && get_color(f.t[pile][r[pile].pos]) /* color OK */
 470                            != get_color(f.t[to][top_to])
 471 #elif defined SPIDER
 472                         && get_suit(f.t[pile][r[pile].pos]) /* color OK */
 473                            == get_suit(f.t[to][top_to])
 474 #endif
 475                         ) {
 476                                 r[pile].ok++;
 477                                 complete |= would_complete(pile);
 478                                 turn     |= would_turn(pile);
 479                                 empty    |= would_empty(pile);
 480                                 for (int i = r[pile].pos; i >= 0; i--)
 481                                         if (is_movable(f.t[pile], i-1))
 482                                                 r[pile].above++;
 483                                         else break;
 484                                 break;
 485                         }
 486                         r[pile].pos--;
 487                         r[pile].below++;
 488                 }
 489         }
 490
 491         /* 2. find optimal pile: (optimized for spider) */
 492         //todo: in spider, prefer longest piles if above==0 (faster completions)
 493         int from = -1;
 494         for (int pile = 0, above = 99, below = 99; pile < NUM_PILES; pile++) {
 495                 if (!r[pile].ok) continue;
 496                 /* don't bother if another pile would be better: prefer ... */
 497                 /* ... to complete a stack: */
 498                 if (!would_complete(pile) && complete) continue;
 499                 /* ... emptying piles: */
 500                 if (!would_empty(pile) && empty && !complete) continue;
 501                 /* ... to turn_over: */
 502                 if (!would_turn(pile) && turn && !complete && !empty) continue;
 503                 /* ... not to rip apart too many cards: */
 504                 if (r[pile].above > above) continue;
 505                 /* if tied, prefer ... */
 506                 if (r[pile].above == above
 507                    /* ... larger pile if destination is empty */
 508                    && (top_to < 0? r[pile].below < below
 509                    /* ... shorter pile otherwise */
 510                                  : r[pile].below > below))
 511                         continue;
 512
 513                 from = pile;
 514                 above = r[pile].above;
 515                 below = r[pile].below;
 516         }
 517
 518         /* 3. move cards over and return: */
 519 #ifdef KLONDIKE
 520         /* prefer waste if it wouldn't turn_over: */
 521         if (!turn && w2t(WASTE, to, 0) == OK)
 522                 return OK;
 523         if (from < 0) /* nothing found */
 524                 return ERR;
 525         return t2t(from, to, 0);
 526 #elif defined SPIDER
 527         if (from < 0) /* nothing found */
 528                 return ERR;
 529         int bottom = first_movable(f.t[from]);
 530         return t2t(from, to, get_rank(f.t[from][bottom]));
 531 #endif
 532 }
 533 #undef would_empty
 534 #undef would_turn
 535 #undef would_complete
 536 int nop(int from, int to, int opt) { (void)from;(void)to;(void)opt;return ERR; }
 537 // }}}
 538
 539 // keyboard input handling {{{
 540 // cursor functions{{{
 541 #ifdef KLONDIKE
 542 void cursor_left (struct cursor* cursor) {
 543         op.h = 1;
 544         if (is_tableu(cursor->pile)) {
 545                 if (cursor->pile > 0) cursor->pile--;
 546                 cursor->opt = 0;
 547         } else { /* stock/waste/foundation*/
 548                 switch (cursor->pile) {
 549                 case WASTE: cursor->pile = STOCK; cursor->opt = 0; break;
 550                 case FOUNDATION:
 551                         if (cursor->opt <= 0)
 552                                 cursor->pile = WASTE;
 553                         else
 554                                 cursor->opt--;
 555                 }
 556         }
 557 }
 558 void cursor_down (struct cursor* cursor) {
 559         op.h = 1;
 560         if (!is_tableu(cursor->pile)) {
 561                 switch (cursor->pile) {
 562                 case STOCK: cursor->pile = TAB_1; break;
 563                 case WASTE: cursor->pile = TAB_2; break;
 564                 case FOUNDATION:
 565                         cursor->pile = TAB_4 + cursor->opt;
 566                 }
 567                 cursor->opt = 0;
 568         }
 569 }
 570 void cursor_up (struct cursor* cursor) {
 571         op.h = 1;
 572         if (is_tableu(cursor->pile)) {
 573                 switch (cursor->pile) { //ugly :|
 574                 case TAB_1: cursor->pile = STOCK; break;
 575                 case TAB_2: cursor->pile = WASTE; break;
 576                 case TAB_3: cursor->pile = WASTE; break;
 577                 case TAB_4: case TAB_5: case TAB_6: case TAB_7:
 578                         cursor->opt=cursor->pile-TAB_4;
 579                         cursor->pile = FOUNDATION;
 580                         break;
 581                 }
 582         }
 583 }
 584 void cursor_right (struct cursor* cursor) {
 585         op.h = 1;
 586         if (is_tableu(cursor->pile)) {
 587                 if (cursor->pile < TAB_MAX) cursor->pile++;
 588         } else {
 589                 switch (cursor->pile) {
 590                 case STOCK: cursor->pile = WASTE; break;
 591                 case WASTE: cursor->pile = FOUNDATION;cursor->opt = 0; break;
 592                 case FOUNDATION:
 593                         if (cursor->opt < NUM_SUITS-1)
 594                                 cursor->opt++;
 595                 }
 596         }
 597 }
 598 #elif defined SPIDER
 599 /*NOTE: one can't highlight the stock due to me being too lazy to implement it*/
 600 void cursor_left (struct cursor* cursor) {
 601         op.h = 1;
 602         if (cursor->pile > 0) cursor->pile--;
 603         cursor->opt = 0;
 604 }
 605 void cursor_down (struct cursor* cursor) {
 606         op.h = 1;
 607         int first = first_movable(f.t[cursor->pile]);
 608         int top = find_top(f.t[cursor->pile]);
 609         if (first + cursor->opt < top)
 610                 cursor->opt++;
 611 }
 612 void cursor_up (struct cursor* cursor) {
 613         op.h = 1;
 614         if (cursor->opt > 0) cursor->opt--;
 615 }
 616 void cursor_right (struct cursor* cursor) {
 617         op.h = 1;
 618         if (cursor->pile < TAB_MAX) cursor->pile++;
 619         cursor->opt = 0;
 620 }
 621 #endif
 622 void cursor_to (struct cursor* cursor, int pile) {
 623         op.h = 1;
 624         cursor->pile = pile;
 625         cursor->opt = 0;
 626 }
 627 int set_mouse(int pile, int* main, int* opt) {
 628         op.h = 0;
 629         if (pile < 0) return 1;
 630         *main = pile;
 631 #ifdef KLONDIKE
 632         if (pile >= FOUNDATION)
 633                 *main = FOUNDATION,
 634                 *opt  = pile - FOUNDATION;
 635 #elif defined SPIDER
 636         (void)opt;
 637 #endif
 638         return 0;
 639 }
 640 //}}}
 641 int get_cmd (int* from, int* to, int* opt) {
 642         int _f, t;
 643         unsigned char mouse[6] = {0}; /* must clear [3]! */
 644         struct cursor inactive = {-1,-1};
 645         static struct cursor active = {0,0};
 646         active.opt = 0; /* always reset offset, but keep pile */
 647
 648         /***/
 649 from_l: print_table(&active, &inactive);
 650         _f = getch(mouse);
 651
 652         switch (_f) {
 653         /* direct addressing: */
 654         case '1': *from = TAB_1; break;
 655         case '2': *from = TAB_2; break;
 656         case '3': *from = TAB_3; break;
 657         case '4': *from = TAB_4; break;
 658         case '5': *from = TAB_5; break;
 659         case '6': *from = TAB_6; break;
 660         case '7': *from = TAB_7; break;
 661 #ifdef SPIDER
 662         case '8': *from = TAB_8; break;
 663         case '9': *from = TAB_9; break;
 664         case '0': *from = TAB_10;break;
 665 #elif defined KLONDIKE
 666         case '9': *from = WASTE; break;
 667         case '0': *from = FOUNDATION; break;
 668         case '8': /* fallthrough */
 669 #endif
 670         case '\n': *from = STOCK; break;
 671         /* cursor keys addressing: */
 672         case KEY_LEFT:
 673         case 'h': cursor_left (&active); goto from_l;
 674         case KEY_DOWN:
 675         case 'j': cursor_down (&active); goto from_l;
 676         case KEY_UP:
 677         case 'k': cursor_up   (&active); goto from_l;
 678         case KEY_RIGHT:
 679         case 'l': cursor_right(&active); goto from_l;
 680         case KEY_HOME:
 681         case 'H': cursor_to(&active,TAB_1);  goto from_l; /* leftmost  tableu */
 682         case KEY_END:
 683         case 'L': cursor_to(&active,TAB_MAX);goto from_l; /* rigthmost tableu */
 684         case KEY_INS:
 685         case 'M': cursor_to(&active,TAB_MAX/2); goto from_l; /* center tableu */
 686         case ' ': /* continue with second cursor */
 687                 *from = active.pile;
 688 #ifdef KLONDIKE
 689                 *opt = active.opt; /* when FOUNDATION */
 690 #endif
 691                 inactive = active;
 692                 break;
 693         /* mouse addressing: */
 694         case MOUSE_MIDDLE: return CMD_NONE;
 695         case MOUSE_RIGHT:
 696                 if (set_mouse(term2pile(mouse), to, opt))
 697                         return CMD_INVAL;
 698                 return CMD_JOIN;
 699         case MOUSE_LEFT:
 700                 if (set_mouse(term2pile(mouse), from, opt))
 701                         return CMD_INVAL;
 702                 break;
 703         /* misc keys: */
 704         case ':':
 705                 {char buf[256];
 706                 fprintf (stderr, ":");
 707                 raw_mode(0); /* turn on echo */
 708                 fgets (buf, 256, stdin);
 709                 raw_mode(1);
 710                 switch(buf[0]) {
 711                 case 'q': return CMD_QUIT;
 712                 case 'n': return CMD_NEW;
 713                 case 'r': return CMD_AGAIN;
 714                 case 'h': return CMD_HELP;
 715                 default:  return CMD_INVAL;
 716                 }}
 717         case 'J':
 718                 *to = active.pile;
 719 #ifdef KLONDIKE
 720                 if (*to == FOUNDATION) return CMD_JOIN;
 721 #endif
 722                 if (*to > TAB_MAX) return CMD_INVAL;
 723                 return CMD_JOIN;
 724         case 'K': /* fallthrough */
 725         case '?': return CMD_HINT;
 726         case 'u': return CMD_UNDO;
 727         case EOF: return CMD_NONE; /* sent by SIGCONT */
 728         default: return CMD_INVAL;
 729         }
 730         inactive.pile = *from; /* for direct addressing highlighting */
 731         if (is_tableu(*from) && f.t[*from][0] == NO_CARD) return CMD_INVAL;
 732
 733         if (*from == STOCK) {
 734                 *to = WASTE;
 735                 return CMD_MOVE;
 736         }
 737
 738         /***/
 739 to_l:   print_table(&active, &inactive);
 740         t = getch(mouse);
 741
 742         switch (t) {
 743         case KEY_LEFT:
 744         case 'h': cursor_left (&active); goto to_l;
 745         case KEY_DOWN:
 746         case 'j': cursor_down (&active); goto to_l;
 747         case KEY_UP:
 748         case 'k': cursor_up   (&active); goto to_l;
 749         case KEY_RIGHT:
 750         case 'l': cursor_right(&active); goto to_l;
 751         case KEY_HOME:
 752         case 'H': cursor_to(&active,TAB_1);     goto to_l;
 753         case KEY_END:
 754         case 'L': cursor_to(&active,TAB_MAX);   goto to_l;
 755         case KEY_INS:
 756         case 'M': cursor_to(&active,TAB_MAX/2); goto to_l;
 757         case 'J': /* fallthrough; just join selected pile */
 758         case ' ':
 759                 *to = active.pile;
 760                 break; /* continues with the foundation/empty tableu check */
 761         case MOUSE_MIDDLE:
 762         case MOUSE_RIGHT: return CMD_NONE;
 763         case MOUSE_LEFT:
 764                 if (set_mouse(term2pile(mouse), to, opt))
 765                         return CMD_INVAL;
 766 /*#ifdef SPIDER
 767                 //TODO: set opt if to field is empty; suppress "up do" dialog from below
 768                 if (is_tableu(*to) && f.t[*to][0] == NO_CARD) {
 769                         int top = find_top(f.t[*from]);
 770                         if (top < 0) return CMD_INVAL;
 771                         if (top >= 0 && !is_movable(f.t[*from], top-1)) {
 772                                 *opt = get_rank(f.t[*from][top]);
 773                         } else {
 774                         // ask user
 775                         }
 776                 }
 777 #endif*/
 778                 break;
 779         case 'K': /* fallthrough */
 780         case '?': return CMD_HINT;
 781         case 'u': return CMD_NONE; /* cancel selection */
 782         case EOF: return CMD_NONE; /* sent by SIGCONT */
 783         default:
 784                 if (t < '0' || t > '9') return CMD_INVAL;
 785                 if (t == '0')
 786 #ifdef KLONDIKE
 787                         *to = FOUNDATION;
 788 #elif defined SPIDER
 789                         *to = TAB_10;
 790 #endif
 791                 else
 792                         *to = t-'1';
 793         }
 794
 795         /***/
 796 #ifdef KLONDIKE
 797         if (*from == FOUNDATION) {
 798                 int top = find_top(f.t[*to]);
 799                 if (top < 0) return CMD_INVAL;
 800                 int color = get_color(f.t[*to][top]);
 801                 int choice_1 = 1-color; /* selects piles of   */
 802                 int choice_2 = 2+color; /* the opposite color */
 803                 int top_c1 = find_top(f.f[choice_1]);
 804                 int top_c2 = find_top(f.f[choice_2]);
 805
 806                 switch ((rank_next(f.f[choice_1][top_c1], f.t[*to][top])
 807                          && top_c1 >= 0 ) << 0
 808                        |(rank_next(f.f[choice_2][top_c2], f.t[*to][top])
 809                          && top_c2 >= 0 ) << 1) {
 810                 case (       1<<0): *opt = choice_1; break; /* choice_1 only */
 811                 case (1<<1       ): *opt = choice_2; break; /* choice_2 only */
 812                 case (1<<1 | 1<<0): /* both, ask user which to pick from */
 813                         printf ("take from (1-4): "); fflush (stdout);
 814                         *opt = getch(NULL) - '1';
 815                         if (*opt < 0 || *opt > 3) return CMD_INVAL;
 816                         break;
 817                 default: return CMD_INVAL; /* none matched */
 818                 }
 819                 /* `opt` is the foundation index (0..3) */
 820         }
 821 #elif defined SPIDER
 822         /* moving to empty tableu? */
 823         if (is_tableu(*to) && f.t[*to][0] == NO_CARD) {
 824                 int bottom = first_movable(f.t[*from]);
 825                 if (inactive.opt >= 0) { /*if from was cursor addressed: */
 826                         *opt = get_rank(f.t[*from][bottom + inactive.opt]);
 827                         return CMD_MOVE;
 828                 }
 829                 int top = find_top(f.t[*from]);
 830                 if (top < 0) return CMD_INVAL;
 831                 if (top >= 0 && !is_movable(f.t[*from], top-1)) {
 832                         *opt = get_rank(f.t[*from][top]);
 833                 } else { /* only ask the user if it's unclear: */
 834                         printf ("\rup to ([a23456789xjqk] or space/return): ");
 835                         *opt = getch(NULL);
 836                         switch (*opt) {
 837                         case ' ': *opt = get_rank(f.t[*from][top]); break;
 838                         case'\n': *opt = get_rank(f.t[*from][bottom]); break;
 839                         case 'a': case 'A': *opt = RANK_A; break;
 840                         case '0': /* fallthrough */
 841                         case 'x': case 'X': *opt = RANK_X; break;
 842                         case 'j': case 'J': *opt = RANK_J; break;
 843                         case 'q': case 'Q': *opt = RANK_Q; break;
 844                         case 'k': case 'K': *opt = RANK_K; break;
 845                         default: *opt -= '1';
 846                         }
 847                         if (*opt < RANK_A || *opt > RANK_K) return ERR;
 848                 }
 849                 /* `opt` is the rank of the highest card to move */
 850         }
 851 #endif
 852         return CMD_MOVE;
 853 }
 854
 855 int getctrlseq(unsigned char* buf) {
 856         int c;
 857         enum esc_states {
 858                 START,
 859                 ESC_SENT,
 860                 CSI_SENT,
 861                 MOUSE_EVENT,
 862         } state = START;
 863         int offset = 0x20; /* never sends control chars as data */
 864         while ((c = getchar()) != EOF) {
 865                 switch (state) {
 866                 case START:
 867                         switch (c) {
 868                         case '\033': state=ESC_SENT; break;
 869                         default: return c;
 870                         }
 871                         break;
 872                 case ESC_SENT:
 873                         switch (c) {
 874                         case '[': state=CSI_SENT; break;
 875                         default: return KEY_INVAL;
 876                         }
 877                         break;
 878                 case CSI_SENT:
 879                         switch (c) {
 880                         case 'A': return KEY_UP;
 881                         case 'B': return KEY_DOWN;
 882                         case 'C': return KEY_RIGHT;
 883                         case 'D': return KEY_LEFT;
 884                         /*NOTE: home/end send ^[[x~ . no support for modifiers*/
 885                         case 'H': return KEY_HOME;
 886                         case 'F': return KEY_END;
 887                         case '2': getchar(); return KEY_INS;
 888                         case '5': getchar(); return KEY_PGUP;
 889                         case '6': getchar(); return KEY_PGDN;
 890                         case 'M': state=MOUSE_EVENT; break;
 891                         default: return KEY_INVAL;
 892                         }
 893                         break;
 894                 case MOUSE_EVENT:
 895                         if (buf == NULL) return KEY_INVAL;
 896                         buf[0] = c - offset;
 897                         buf[1] = getchar() - offset;
 898                         buf[2] = getchar() - offset;
 899                         return MOUSE_ANY;
 900                 default:
 901                         return KEY_INVAL;
 902                 }
 903         }
 904         return 2;
 905 }
 906 int term2pile(unsigned char *mouse) {
 907         int line   = (mouse[2]-1);
 908         int column = (mouse[1]-1) / op.s->width;
 909
 910         if (line < op.s->height) { /* first line */
 911 #ifdef KLONDIKE
 912                 switch (column) {
 913                 case 0: return STOCK;
 914                 case 1: return WASTE;
 915                 case 2: return -1; /* spacer */
 916                 case 3: return FOUNDATION+0;
 917                 case 4: return FOUNDATION+1;
 918                 case 5: return FOUNDATION+2;
 919                 case 6: return FOUNDATION+3;
 920                 }
 921 #elif defined SPIDER
 922                 if (column < 3) return STOCK;
 923                 return -1;
 924 #endif
 925         } else if (line > op.s->height) { /* tableu */
 926                 if (column <= TAB_MAX) return column;
 927         }
 928         return -1;
 929 }
 930 int wait_mouse_up(unsigned char* mouse) {
 931         struct cursor cur = {-1,-1};
 932         int level = 1;
 933         /* note: if dragged [3]==1 and second position is in mouse[0,4,5] */
 934
 935         /* display a cursor while mouse button is pushed: */
 936         int pile = term2pile(mouse);
 937         cur.pile = pile;
 938 #ifdef KLONDIKE
 939         if (pile >= FOUNDATION) {
 940                 cur.pile = FOUNDATION;
 941                 cur.opt = pile-FOUNDATION;
 942         }
 943 #endif
 944         /* need to temporarily show the cursor, then revert to last state: */
 945         int old_show_cursor_hi = op.h; //TODO: ARGH! that's awful!
 946         op.h = 1;
 947         print_table(&cur, NO_HI); //TODO: should not overwrite inactive cursor!
 948         op.h = old_show_cursor_hi;
 949
 950         while (level > 0) {
 951                 if (getctrlseq (mouse+3) == MOUSE_ANY) {
 952                         /* ignore mouse wheel events: */
 953                         if (mouse[3] & 0x40) continue;
 954
 955                         else if((mouse[3]&3) == 3) level--; /* release event */
 956                         else level++; /* another button pressed */
 957                 }
 958         }
 959
 960         int success = mouse[1] == mouse[4] && mouse[2] == mouse[5];
 961         if (success) {
 962                 mouse[3] = 0;
 963         }
 964         return success;
 965 }
 966
 967 int getch(unsigned char* buf) {
 968 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 969 compatible with the ncurses implementation of same name */
 970         int action;
 971         if (buf && buf[3]) {
 972                 /* mouse was dragged; return 'ungetted' previous destination */
 973                 action = MOUSE_DRAG;
 974                 /* keep original [0], as [3] only contains release event */
 975                 buf[1] = buf[4];
 976                 buf[2] = buf[5];
 977                 buf[3] = 0;
 978         } else {
 979                 action = getctrlseq(buf);
 980         }
 981
 982         switch (action) {
 983         case MOUSE_ANY:
 984                 if (buf[0] > 3) break; /* ignore wheel events */
 985                 wait_mouse_up(buf);
 986                 /* fallthrough */
 987         case MOUSE_DRAG:
 988                 switch (buf[0]) {
 989                 case 0: return MOUSE_LEFT;
 990                 case 1: return MOUSE_MIDDLE;
 991                 case 2: return MOUSE_RIGHT;
 992                 }
 993         }
 994
 995         return action;
 996 }
 997 // }}}
 998
 999 // shuffling and dealing {{{
1000 void deal(long seed) {
1001         f = (const struct playfield){0}; /* clear playfield */
1002         card_t deck[DECK_SIZE*NUM_DECKS];
1003         int avail = DECK_SIZE*NUM_DECKS;
1004         for (int i = 0; i < DECK_SIZE*NUM_DECKS; i++) deck[i] = (i%DECK_SIZE)+1;
1005 #ifdef SPIDER
1006         if (op.m != NORMAL) for (int i = 0; i < DECK_SIZE*NUM_DECKS; i++) {
1007                 if (op.m == MEDIUM) deck[i] = 1+((deck[i]-1) | 2);
1008                 if (op.m == EASY)   deck[i] = 1+((deck[i]-1) | 2 | 1);
1009                 /* the 1+ -1 dance gets rid of the offset created by NO_CARD */
1010         }
1011 #endif
1012         srand (seed);
1013         for (int i = DECK_SIZE*NUM_DECKS-1; i > 0; i--) { /* fisher-yates */
1014                 int j = rand() % (i+1);
1015                 if (j-i) deck[i]^=deck[j],deck[j]^=deck[i],deck[i]^=deck[j];
1016         }
1017
1018         /* deal cards: */
1019         for (int i = 0; i < NUM_PILES; i++) {
1020 #ifdef KLONDIKE
1021                 int closed = i; /* pile n has n closed cards, then 1 open */
1022 #elif defined SPIDER
1023                 int closed = i<4?5:4; /* pile 1-4 have 5, 5-10 have 4 closed */
1024 #endif
1025                 /* face down cards are negated: */
1026                 for (int j = 0; j < closed; j++) f.t[i][j] = -deck[--avail];
1027                 f.t[i][closed] = deck[--avail]; /* the face-up card */
1028         }
1029         /* rest of the cards to the stock; NOTE: assert(avail==50) for spider */
1030         for (f.z = 0; avail; f.z++) f.s[f.z] = deck[--avail];
1031 #ifdef KLONDIKE
1032         f.w = -1; /* @start: nothing on waste */
1033 #elif defined SPIDER
1034         f.w = 0; /* number of used foundations */
1035 #endif
1036
1037         f.u = &undo_sentinel;
1038 }
1039 //}}}
1040
1041 // screen drawing routines {{{
1042 void print_hi(int invert, int grey_bg, int bold, char* str) {
1043         if (!op.h) invert = 0; /* don't show invert if we used the mouse last */
1044         if (bold && op.s == &unicode_large_color){ //awful hack for bold + faint
1045                 int offset = str[3]==017?16:str[4]==017?17:0;
1046                 printf ("%s%s%s""%.*s%s%s""%s%s%s",
1047                         "\033[1m", invert?"\033[7m":"", grey_bg?"\033[100m":"",
1048                         offset, str, bold?"\033[1m":"", str+offset,
1049                         grey_bg?"\033[49m":"", invert?"\033[27m":"","\033[22m");
1050                 return;
1051         }
1052         printf ("%s%s%s%s%s%s%s",
1053                 bold?"\033[1m":"", invert?"\033[7m":"", grey_bg?"\033[100m":"",
1054                 str,
1055                 grey_bg?"\033[49m":"", invert?"\033[27m":"",bold?"\033[22m":"");
1056 }
1057 void print_table(const struct cursor* active, const struct cursor* inactive) {
1058         printf("\033[2J\033[H"); /* clear screen, reset cursor */
1059 #ifdef KLONDIKE
1060         /* print stock, waste and foundation: */
1061         for (int line = 0; line < op.s->height; line++) {
1062                 /* stock: */
1063                 print_hi (active->pile == STOCK, inactive->pile == STOCK, 1, (
1064                         (f.w < f.z-1)?op.s->facedown
1065                         :op.s->placeholder)[line]);
1066                 /* waste: */
1067                 print_hi (active->pile == WASTE, inactive->pile == WASTE, 1, (
1068                         /* NOTE: cast, because f.w sometimes is (short)-1 !? */
1069                         ((short)f.w >= 0)?op.s->card[f.s[f.w]]
1070                         :op.s->placeholder)[line]);
1071                 printf ("%s", op.s->card[NO_CARD][line]); /* spacer */
1072                 /* foundation: */
1073                 for (int pile = 0; pile < NUM_SUITS; pile++) {
1074                         int card = find_top(f.f[pile]);
1075                         print_hi (active->pile==FOUNDATION && active->opt==pile,
1076                                 inactive->pile==FOUNDATION && (
1077                                         /* cursor addr.     || direct addr.   */
1078                                         inactive->opt==pile || inactive->opt < 0
1079                                 ), 1,
1080                                 (card < 0)?op.s->placeholder[line]
1081                                 :op.s->card[f.f[pile][card]][line]);
1082                 }
1083                 printf("\n");
1084         }
1085         printf("\n");
1086 #elif defined SPIDER
1087         int fdone; for (fdone = NUM_DECKS*NUM_SUITS; fdone; fdone--)
1088                 if (f.f[fdone-1][RANK_K]) break;  /*number of completed stacks*/
1089         int spacer_from = f.z?(f.z/10-1) * op.s->halfwidth[0] + op.s->width:0;
1090         int spacer_to   = NUM_PILES*op.s->width -
1091                 ((fdone?(fdone-1) * op.s->halfwidth[1]:0)+op.s->width);
1092         for (int line = 0; line < op.s->height; line++) {
1093                 /* available stock: */
1094                 for (int i = f.z/10; i; i--) {
1095                         if (i==1) printf ("%s", op.s->facedown[line]);
1096                         else      printf ("%s", op.s->halfstack[line]);
1097                 }
1098                 /* spacer: */
1099                 for (int i = spacer_from; i < spacer_to; i++) printf (" ");
1100                 /* foundation (overlapping): */
1101                 for (int i = NUM_DECKS*NUM_SUITS-1, half = 0; i >= 0; i--) {
1102                         int overlap = half? op.s->halfcard[line]: 0;
1103                         if (f.f[i][RANK_K]) printf ("%.*s", op.s->halfwidth[2],
1104                                 op.s->card[f.f[i][RANK_K]][line]+overlap),
1105                                 half++;
1106                 }
1107                 printf("\n");
1108         }
1109         printf("\n");
1110 #endif
1111 #ifdef KLONDIKE
1112 #define DO_HI(cursor) (cursor->pile == pile && (movable || empty))
1113 #define TOP_HI(c) 1 /* can't select partial stacks in KLONDIKE */
1114 #define INC_OFFSET
1115 #elif defined SPIDER
1116         int offset[NUM_PILES]={1,1,1,1,1,1,1,1,1,1}; // :|
1117 #define DO_HI(cursor) (cursor->pile == pile && (movable || empty) \
1118         && offset[pile] > cursor->opt)
1119 #define TOP_HI(cursor) (cursor->pile == pile && movable \
1120         && offset[pile]-1 == cursor->opt)
1121 #define INC_OFFSET if (movable) offset[pile]++
1122 #endif
1123         /* print tableu piles: */
1124         int row[NUM_PILES] = {0};
1125         int line[NUM_PILES]= {0};
1126         int label[NUM_PILES]={0};
1127         int line_had_card;
1128         int did_placeholders = 0;
1129         do {
1130                 line_had_card = 0;
1131                 for (int pile = 0; pile < NUM_PILES; pile++) {
1132                         card_t card = f.t[pile][row[pile]];
1133                         card_t next = f.t[pile][row[pile]+1];
1134                         int movable = is_movable(f.t[pile], row[pile]);
1135                         int empty   = !card && row[pile] == 0;
1136
1137                         print_hi (DO_HI(active), DO_HI(inactive), movable, (
1138                                 (!card && row[pile] == 0)?op.s->placeholder
1139                                 :(card<0)?op.s->facedown
1140                                 :op.s->card[card]
1141                                 )[line[pile]]);
1142
1143                         int extreme_overlap = ( 3  /* spacer, labels, status */
1144                                 + 2 * op.s->height /* stock, top tableu card */
1145                                 + find_top(f.t[pile]) * op.s->overlap) >op.w[0];
1146                         /* normal overlap: */
1147                         if (++line[pile] >= (next?op.s->overlap:op.s->height)
1148                         /* extreme overlap on closed cards: */
1149                         || (extreme_overlap &&
1150                             line[pile] >= 1 &&
1151                             f.t[pile][row[pile]] < 0 &&
1152                             f.t[pile][row[pile]+1] <0)
1153                         /* extreme overlap on sequences: */
1154                         || (extreme_overlap &&
1155                             !TOP_HI(active) && /*always show top selected card*/
1156                             line[pile] >= 1 && row[pile] > 0 &&
1157                             f.t[pile][row[pile]-1] > NO_CARD &&
1158                             is_consecutive (f.t[pile], row[pile]) &&
1159                             is_consecutive (f.t[pile], row[pile]-1) &&
1160                             f.t[pile][row[pile]+1] != NO_CARD)
1161                         ) {
1162                                 line[pile]=0;
1163                                 row[pile]++;
1164                                 INC_OFFSET;
1165                         }
1166                         /* tableu labels: */
1167                         if(!card && !label[pile] && row[pile]>0&&line[pile]>0) {
1168                                 label[pile] = 1;
1169                                 printf ("\b\b%d ", (pile+1) % 10); //XXX: hack
1170                         }
1171                         line_had_card |= !!card;
1172                         did_placeholders |= row[pile] > 0;
1173                 }
1174                 printf ("\n");
1175         } while (line_had_card || !did_placeholders);
1176 }
1177
1178 void visbell (void) {
1179         printf ("\033[?5h"); fflush (stdout);
1180         usleep (100000);
1181         printf ("\033[?5l"); fflush (stdout);
1182 }
1183 void win_anim(void) {
1184         printf ("\033[?25l"); /* hide cursor */
1185         for (;;) {
1186                 /* set cursor to random location */
1187                 int row = 1+rand()%(24-op.s->width);
1188                 int col = 1+rand()%(80-op.s->height);
1189
1190                 /* draw random card */
1191                 int face = 1 + rand() % 52;
1192                 for (int l = 0; l < op.s->height; l++) {
1193                         printf ("\033[%d;%dH", row+l, col);
1194                         printf ("%s", op.s->card[face][l]);
1195                 }
1196                 fflush (stdout);
1197
1198                 /* exit on keypress */
1199                 struct pollfd p = {STDIN_FILENO, POLLIN, 0};
1200                 if (poll (&p, 1, 80)) goto fin;
1201         }
1202 fin:
1203         printf ("\033[?25h"); /* show cursor */
1204         return;
1205 }
1206 //}}}
1207
1208 // undo logic {{{
1209 void undo_push (int _f, int t, int n, int o) {
1210         struct undo* new = malloc(sizeof(struct undo));
1211         new->f = _f;
1212         new->t = t;
1213         new->n = n;
1214         new->o = o;
1215         new->prev = f.u;
1216         new->next = NULL;
1217         f.u->next = new;
1218         f.u = f.u->next;
1219 }
1220 void undo_pop (struct undo* u) {
1221         if (u == &undo_sentinel) return;
1222
1223 #ifdef KLONDIKE
1224         if (u->f == FOUNDATION) {
1225                 /* foundation -> tableu */
1226                 int top_f = find_top(f.f[u->n]);
1227                 int top_t = find_top(f.t[u->t]);
1228                 f.f[u->n][top_f+1] = f.t[u->t][top_t];
1229                 f.t[u->t][top_t] = NO_CARD;
1230         } else if (u->f == WASTE && u->t == FOUNDATION) {
1231                 /* waste -> foundation */
1232                 /* split u->n into wst and fnd: */
1233                 int wst = u->n & 0xffff;
1234                 int fnd = u->n >> 16;
1235                 /* move stock cards one position up to make room: */
1236                 for (int i = f.z; i >= wst; i--) f.s[i+1] = f.s[i];
1237                 /* move one card from foundation to waste: */
1238                 int top = find_top(f.f[fnd]);
1239                 f.s[wst] = f.f[fnd][top];
1240                 f.f[fnd][top] = NO_CARD;
1241                 f.z++;
1242                 f.w++;
1243         } else if (u->f == WASTE) {
1244                 /* waste -> tableu */
1245                 /* move stock cards one position up to make room: */
1246                 for (int i = f.z; i >= u->n; i--) f.s[i+1] = f.s[i];
1247                 /* move one card from tableu to waste: */
1248                 int top = find_top(f.t[u->t]);
1249                 f.s[u->n] = f.t[u->t][top];
1250                 f.t[u->t][top] = NO_CARD;
1251                 f.z++;
1252                 f.w++;
1253         } else if (u->t == FOUNDATION) {
1254                 /* tableu -> foundation */
1255                 int top_f = find_top(f.t[u->f]);
1256                 int top_t = find_top(f.f[u->n]);
1257                 /* close topcard if previous action caused turn_over(): */
1258                 if (u->o) f.t[u->f][top_f] *= -1;
1259                 /* move one card from foundation to tableu: */
1260                 f.t[u->f][top_f+1] = f.f[u->n][top_t];
1261                 f.f[u->n][top_t] = NO_CARD;
1262         } else {
1263                 /* tableu -> tableu */
1264                 int top_f = find_top(f.t[u->f]);
1265                 int top_t = find_top(f.t[u->t]);
1266                 /* close topcard if previous action caused turn_over(): */
1267                 if (u->o) f.t[u->f][top_f] *= -1;
1268                 /* move n cards from tableu[f] to tableu[t]: */
1269                 for (int i = 0; i < u->n; i++) {
1270                         f.t[u->f][top_f+u->n-i] = f.t[u->t][top_t-i];
1271                         f.t[u->t][top_t-i] = NO_CARD;
1272                 }
1273         }
1274 #elif defined SPIDER
1275         if (u->f == STOCK) {
1276                 /* stock -> tableu */
1277                 /*remove a card from each pile and put it back onto the stock:*/
1278                 for (int pile = NUM_PILES-1; pile >= 0; pile--) {
1279                         int top = find_top(f.t[pile]);
1280                         f.s[f.z++] = f.t[pile][top];
1281                         f.t[pile][top] = NO_CARD;
1282                 }
1283         } else if (u->t == FOUNDATION) {
1284                 /* tableu -> foundation */
1285                 int top = find_top(f.t[u->f]);
1286                 /* close topcard if previous action caused turn_over(): */
1287                 if (u->o) f.t[u->f][top] *= -1;
1288                 /* append cards from foundation to tableu */
1289                 for (int i = RANK_K; i >= RANK_A; i--) {
1290                         f.t[u->f][++top] = f.f[u->n][i];
1291                         f.f[u->n][i] = NO_CARD;
1292                 }
1293                 f.w--; /* decrement complete-foundation-counter */
1294
1295         } else {
1296                 /* tableu -> tableu */
1297                 int top_f = find_top(f.t[u->f]);
1298                 int top_t = find_top(f.t[u->t]);
1299                 /* close topcard if previous action caused turn_over(): */
1300                 if (u->o) f.t[u->f][top_f] *= -1;
1301                 /* move n cards from tableu[f] to tableu[t]: */
1302                 for (int i = 0; i < u->n; i++) {
1303                         f.t[u->f][top_f+u->n-i] = f.t[u->t][top_t-i];
1304                         f.t[u->t][top_t-i] = NO_CARD;
1305                 }
1306         }
1307 #endif
1308
1309         void* old = f.u;
1310         f.u = f.u->prev;
1311         free(old);
1312 }
1313 void free_undo (struct undo* u) {
1314         while (u && u != &undo_sentinel) {
1315                 void* old = u;
1316                 u = u->prev;
1317                 free (old);
1318         }
1319 }
1320 //}}}
1321
1322 // initialization stuff {{{
1323 void screen_setup (int enable) {
1324         if (enable) {
1325                 raw_mode(1);
1326                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
1327                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
1328                 printf ("\033[?1000h"); /* enable mouse */
1329         } else {
1330                 printf ("\033[?1000l"); /* disable mouse */
1331                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
1332                 raw_mode(0);
1333         }
1334 }
1335
1336 void raw_mode(int enable) {
1337         static struct termios saved_term_mode;
1338         struct termios raw_term_mode;
1339
1340         if (enable) {
1341                 if (saved_term_mode.c_lflag == 0)/*don't overwrite stored mode*/
1342                         tcgetattr(STDIN_FILENO, &saved_term_mode);
1343                 raw_term_mode = saved_term_mode;
1344                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
1345                 raw_term_mode.c_cc[VMIN] = 1 ;
1346                 raw_term_mode.c_cc[VTIME] = 0;
1347                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
1348         } else {
1349                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
1350         }
1351 }
1352
1353 void signal_handler (int signum) {
1354         struct winsize w;
1355         switch (signum) {
1356         case SIGTSTP:
1357                 screen_setup(0);
1358                 signal(SIGTSTP, SIG_DFL); /* NOTE: assumes SysV semantics! */
1359                 raise(SIGTSTP);
1360                 break;
1361         case SIGCONT:
1362                 screen_setup(1);
1363                 print_table(NO_HI, NO_HI);
1364                 break;
1365         case SIGINT: //TODO: don't exit; just warn like vim does
1366                 exit(128+SIGINT);
1367         case SIGWINCH:
1368                 ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
1369                 op.w[0] = w.ws_row;
1370                 op.w[1] = w.ws_col;
1371                 break;
1372         }
1373 }
1374 void signal_setup(void) {
1375         struct sigaction saction;
1376
1377         saction.sa_handler = signal_handler;
1378         sigemptyset(&saction.sa_mask);
1379         saction.sa_flags = 0;
1380         if (sigaction(SIGTSTP, &saction, NULL) < 0) {
1381                 perror ("SIGTSTP");
1382                 exit (1);
1383         }
1384         if (sigaction(SIGCONT, &saction, NULL) < 0) {
1385                 perror ("SIGCONT");
1386                 exit (1);
1387         }
1388         if (sigaction(SIGINT, &saction, NULL) < 0) {
1389                 perror ("SIGINT");
1390                 exit (1);
1391         }
1392         if (sigaction(SIGWINCH, &saction, NULL) < 0) {
1393                 perror ("SIGWINCH");
1394                 exit (1);
1395         }
1396 }
1397 //}}}
1398
1399 //vim: foldmethod=marker