mines.c

   1 /*******************************************************************************
   2  minesviiper 0.3.145926
   3  By Tobias Girstmair, 2015 - 2018
   4
   5  ./minesviiper 16x16x40
   6  (see ./minesviiper -h for full list of options)
   7
   8  MOUSE MODE: - left click to open and choord
   9              - right click to flag/unflag
  10  VI MODE:    - hjkl to move cursor left/down/up/right
  11              - o/space to open and choord
  12              - i to flag/unflag
  13              - (see `./minesviiper -h' for all keybindings)
  14
  15  GNU GPL v3, see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt
  16 *******************************************************************************/
  17
  18
  19 #define _POSIX_C_SOURCE 2 /*for getopt, sigaction in c99*/
  20 #include <ctype.h>
  21 #include <signal.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/ioctl.h>
  25 #include <sys/time.h>
  26 #include <termios.h>
  27 #include <time.h>
  28 #include <unistd.h>
  29
  30 #include "mines.h"
  31 #include "schemes.h"
  32
  33 #define LINE_OFFSET 3
  34 #define LINES_AFTER 2
  35 #define COL_OFFSET 2
  36 #define BIG_MOVE 5
  37 #define MOUSE_MAX 231
  38
  39 #define MIN(a,b) (a>b?b:a)
  40 #define MAX(a,b) (a>b?a:b)
  41 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  42 #define printm(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
  43 #define print(str) fputs (str?str:"", stdout)
  44 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  45 #define BORDER(l, c) op.scheme->border[B_ ## l][B_ ## c]
  46 #define CW op.scheme->cell_width /* for brevity */
  47 #define CTRL_ 0x1F &
  48 #define AROUND(_line, _column) TODO: NOTIMPL
  49
  50 struct minefield f;
  51 struct game g;
  52 struct opt op;
  53
  54 int main (int argc, char** argv) {
  55         /* defaults: */
  56         f.w = 30;
  57         f.h = 16;
  58         f.m = 99;
  59         op.scheme = &symbols_mono;
  60         op.mode = FLAG;
  61
  62         int optget;
  63         opterr = 0; /* don't print message on unrecognized option */
  64         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
  65                 switch (optget) {
  66                 case 'n': op.mode    = NOFLAG; break;
  67                 case 'f': op.mode    = FLAG; break; /*default*/
  68                 case 'q': op.mode    = QUESM; break;
  69                 case 'c': op.scheme  = &symbols_col1; break;
  70                 case 'd': op.scheme  = &symbols_doublewidth; break;
  71                 case 'h':
  72                 default:
  73                         fprintf (stderr, SHORTHELP LONGHELP, argv[0]);
  74                         return !(optget=='h');
  75                 }
  76         } if (optind < argc) { /* parse Fieldspec */
  77                 if (parse_fieldspec (argv[optind])) {
  78                         fprintf (stderr, "FIELDSPEC: WxH[xM]"
  79                         " (width 'x' height 'x' mines)\n");
  80                         return 1;
  81                 }
  82         }
  83
  84         signal_setup();
  85         screen_setup(1);
  86         atexit (*quit);
  87
  88         /* check boundaries */
  89         if (f.m > (f.w-1) * (f.h-1)) {
  90                 move_ph (LINE_OFFSET+f.h+LINES_AFTER-1,0);
  91                 f.m = (f.w-1) * (f.h-1);
  92                 fprintf (stdout, "too many mines. reduced to %d.\r\n", f.m); //TODO: should disappear after a timeout (stomp-hi?)
  93         }
  94         /* end check */
  95
  96 newgame:
  97         switch (minesviiper()) {
  98         case GAME_NEW: goto newgame;
  99         case GAME_WON: g.o = GAME_WON; break;
 100         case GAME_LOST:g.o = GAME_LOST;break;
 101         case GAME_QUIT:goto quit;
 102         }
 103
 104         timer_setup(0); /* stop timer */
 105         show_minefield (SHOWMINES);
 106         for(;;) {
 107                 switch(getch_wrapper()) {
 108                 case WRAPPER_EMOTICON:
 109                 case 'r':
 110                         free_field ();
 111                         goto newgame;
 112                 case 'q': goto quit;
 113                 }
 114         }
 115
 116 quit:
 117         return 0;
 118 }
 119
 120 int minesviiper(void) {
 121         f.c = alloc_array (f.h, f.w); /* TODO: just memset it */
 122         g = (const struct game){0}; /* reset all game-specific parameters */
 123
 124         show_minefield (NORMAL);
 125
 126         for(;;) {
 127                 switch (getch_wrapper()) {
 128                 case ' ':
 129                         if (g.s == MODE_OPEN || f.c[g.p[0]][g.p[1]].o == OPENED)
 130                                 goto open_cell;
 131                         if (g.s == MODE_FLAG)
 132                                 goto flag_cell;
 133                         if (g.s ==  MODE_QUESM)
 134                                 goto quesm_cell;
 135                         break;
 136                 case 'a':
 137                         g.s = (g.s+1)%(op.mode+1);
 138                         show_minefield (g.c?SHOWMINES:NORMAL);
 139                         break;
 140                 open_cell:
 141                 case CTRSEQ_MOUSE_LEFT:
 142                 case 'o':
 143                         switch (do_uncover(&(g.n))) {
 144                                 case GAME_LOST: return GAME_LOST;
 145                                 case GAME_WON:  return GAME_WON;
 146                         }
 147                         break;
 148                 flag_cell:
 149                 case CTRSEQ_MOUSE_RIGHT:
 150                 case 'i': flag_square (g.p[0], g.p[1]); break;
 151                 quesm_cell:
 152                 case '?':quesm_square (g.p[0], g.p[1]); break;
 153                 case CTRSEQ_CURSOR_LEFT:
 154                 case 'h': move_hi (g.p[0],   g.p[1]-1); break;
 155                 case CTRSEQ_CURSOR_DOWN:
 156                 case 'j': move_hi (g.p[0]+1, g.p[1]  ); break;
 157                 case CTRSEQ_CURSOR_UP:
 158                 case 'k': move_hi (g.p[0]-1, g.p[1]  ); break;
 159                 case CTRSEQ_CURSOR_RIGHT:
 160                 case 'l': move_hi (g.p[0],   g.p[1]+1); break;
 161                 case 'w': to_next_boundary (g.p[0], g.p[1], '>'); break;
 162                 case 'b': to_next_boundary (g.p[0], g.p[1], '<'); break;
 163                 case 'u': to_next_boundary (g.p[0], g.p[1], '^'); break;
 164                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v'); break;
 165                 case '0': /* fallthrough */
 166                 case '^': move_hi (g.p[0],    0        ); break;
 167                 case '$': move_hi (g.p[0],    f.w-1    ); break;
 168                 case 'g': move_hi (0,         g.p[1]   ); break;
 169                 case 'G': move_hi (f.h-1,     g.p[1]   ); break;
 170                 case 'z': move_hi (f.h/2, f.w/2); break;
 171                 case 'm': set_mark(); break;
 172                 case'\'': /* fallthrough */
 173                 case '`': jump_mark(); break;
 174                 case WRAPPER_EMOTICON:
 175                 case 'r': return GAME_NEW;
 176                 case 'q': return GAME_QUIT;
 177                 case CTRL_'L': show_minefield (NORMAL); break;
 178                 case '\\':
 179                         if (g.n == GAME_NEW) break; /* must open a cell first */
 180                         show_minefield (g.c?NORMAL:SHOWMINES);
 181                         g.c = !g.c;
 182                         break;
 183                 }
 184         }
 185
 186 }
 187
 188 void quit (void) {
 189         screen_setup(0);
 190         free_field ();
 191 }
 192
 193 /* I haven't won as long as a cell exists, that
 194     - I haven't opened, and
 195     - is not a mine */
 196 int everything_opened (void) {
 197         for (int row = 0; row < f.h; row++)
 198                 for (int col = 0; col < f.w; col++)
 199                         if (f.c[row][col].o == CLOSED &&
 200                             f.c[row][col].m == NO_MINE  ) return 0;
 201         return 1;
 202 }
 203
 204 int wait_mouse_up (int l, int c) { /* TODO: should not take minefield-coords but absolute ones */
 205         unsigned char mouse2[3];
 206         int level = 1;
 207         int l2, c2;
 208
 209         /* show :o face */
 210         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 211
 212         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 213                 /* show a pushed-in button if cursor is on minefield */
 214                 move_ph (l+LINE_OFFSET, field2screen_c(c));
 215                 fputs (op.scheme->mouse_highlight, stdout);
 216         }
 217
 218         while (level > 0) {
 219                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 220                         /* ignore mouse wheel events: */
 221                         if (mouse2[0] & 0x40) continue;
 222
 223                         else if (mouse2[0]&3 == 3) level--; /* release event */
 224                         else level++; /* another button pressed */
 225                 }
 226         }
 227
 228         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 229
 230         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 231                 partial_show_minefield (l, c, NORMAL);
 232         }
 233         c2 = screen2field_c(mouse2[1]);
 234         l2 = screen2field_l(mouse2[2]);
 235         return ((l2 == l) && (c2 == c));
 236 }
 237
 238 int choord_square (int line, int col) {
 239         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 240                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 241                         if (f.c[l][c].f != FLAG) {
 242                                 if (uncover_square (l, c))
 243                                          return 1;
 244                         }
 245                 }
 246         }
 247
 248         return 0;
 249 }
 250
 251 int uncover_square (int l, int c) {
 252         f.c[l][c].o = OPENED;
 253         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 254         partial_show_minefield (l, c, NORMAL);
 255
 256         if (f.c[l][c].m) {
 257                 f.c[l][c].m = DEATH_MINE;
 258                 return 1;
 259         }
 260
 261         /* check for chording */
 262         if (f.c[l][c].n == 0) {
 263                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 264                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 265                                 int newl = l + choord_l;
 266                                 int newc = c + choord_c;
 267                                 if (newl >= 0 && newl < f.h &&
 268                                     newc >= 0 && newc < f.w &&
 269                                     f.c[newl][newc].o == CLOSED &&
 270                                     uncover_square (newl, newc)) {
 271                                          return 1;
 272                                 }
 273                         }
 274                 }
 275         }
 276
 277         return 0;
 278 }
 279
 280 void flag_square (int l, int c) {
 281         static char modechar[] = {'*', '!', '?'};
 282
 283         if (f.c[l][c].o != CLOSED) return;
 284         /* cycle through flag/quesm/noflag: */
 285         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 286         if (f.c[l][c].f==FLAG) g.f++;
 287         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 288                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 289         partial_show_minefield (l, c, NORMAL);
 290         move_ph (1, op.scheme->cell_width);
 291         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 292 }
 293
 294 void quesm_square (int l, int c) {
 295         /* toggle question mark / none. won't turn flags into question marks.
 296         unlike flag_square, this function doesn't respect `-q'. */
 297         if      (f.c[l][c].o != CLOSED) return;
 298         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 299         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 300         partial_show_minefield (l, c, NORMAL);
 301 }
 302
 303 int do_uncover (int* is_newgame) {
 304         if (*is_newgame == GAME_NEW) {
 305                 *is_newgame = GAME_INPROGRESS;
 306                 fill_minefield (g.p[0], g.p[1]);
 307                 timer_setup(1);
 308         }
 309
 310         if (f.c[g.p[0]][g.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 311         if (f.c[g.p[0]][g.p[1]].o == CLOSED) {
 312                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 313         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 314                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 315         } else {
 316                 /* show the stomp size if we aren't fully flagged */
 317                 for (int l = MAX(g.p[0]-1, 0); l <= MIN(g.p[0]+1, f.h-1); l++) {
 318                         for (int c = MAX(g.p[1]-1, 0); c <= MIN(g.p[1]+1, f.w-1); c++) {
 319                                 if (f.c[l][c].o == CLOSED && f.c[l][c].f !=FLAG)
 320                                         partial_show_minefield (l, c, HIGHLIGHT); //TODO: hide after timeout
 321                                         /* save the highlight position, timeout-end, and setup a timer. if another tiemout comes in before the timeout is over, the old one shall be removed and the timer cancelled before drawing the new one. */
 322                         }
 323                 }
 324         }
 325         if (everything_opened()) return GAME_WON;
 326
 327         return GAME_INPROGRESS;
 328 }
 329
 330 void set_mark(void) {
 331         int mark = tolower(getch_wrapper());
 332         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 333
 334         g.m[mark-'a'].l = g.p[0];
 335         g.m[mark-'a'].c = g.p[1];
 336         g.m[mark-'a'].s = 1;
 337 }
 338
 339 void jump_mark(void) {
 340         int mark = tolower(getch_wrapper());
 341         /* check bounds and if set: */
 342         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 343         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 344 }
 345
 346 void fill_minefield (int l, int c) {
 347         srand (time(0));
 348         int mines_set = f.m;
 349         while (mines_set) {
 350                 int line = rand() % f.h;
 351                 int col = rand() % f.w;
 352
 353                 if (f.c[line][col].m) {
 354                 /* skip if field already has a mine */
 355                         continue;
 356                 } else if ((line == l) && (col == c)) {
 357                 /* don't put a mine on the already opened (first click) field */
 358                         continue;
 359                 } else {
 360                         mines_set--;
 361                         f.c[line][col].m = STD_MINE;
 362                 }
 363         }
 364
 365         /* precalculate neighbours */
 366         for (int l=0; l < f.h; l++)
 367                 for (int c=0; c < f.w; c++)
 368                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 369 }
 370
 371 void move_ph (int line, int col) {
 372         /* move printhead to zero-indexed position */
 373         printf ("\033[%d;%dH", line+1, col+1);
 374 }
 375
 376 void move_hi (int l, int c) {
 377         /* move cursor and highlight to absolute coordinates */
 378
 379         partial_show_minefield (g.p[0], g.p[1], NORMAL);
 380         /* update g.p */
 381         g.p[0] = CLAMP(l, 0, f.h-1);
 382         g.p[1] = CLAMP(c, 0, f.w-1);
 383         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 384
 385         print("\033[7m"); /* reverse video */
 386         partial_show_minefield (g.p[0], g.p[1], HIGHLIGHT);
 387         print("\033[0m"); /* un-invert */
 388 }
 389
 390 /* to_next_boundary(): move into the supplied direction until a change in open-
 391 state or flag-state is found and move there. falls back to BIG_MOVE. */
 392 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 393         new_ ## X OP ## = BIG_MOVE;\
 394         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 395                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 396                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 397                         new_ ## X = i OP 1;\
 398                         break;\
 399                 }\
 400         } while(0)
 401 void to_next_boundary (int l, int c, char direction) {
 402         int new_l = l;
 403         int new_c = c;
 404         switch (direction) {
 405         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 406         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 407         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 408         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 409         }
 410
 411         move_hi (new_l, new_c);
 412 }
 413 #undef FIND_NEXT
 414
 415 char* cell2schema (int l, int c, int mode) {
 416         struct minecell cell = f.c[l][c];
 417
 418         if (mode == SHOWMINES) return (
 419                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 420                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 421                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 422                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 423                 cell.o == CLOSED          ? op.scheme->field_closed:
 424                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 425          else return (
 426                 cell.f == FLAG            ? op.scheme->field_flagged:
 427                 cell.f == QUESM           ? op.scheme->field_question:
 428                 cell.o == CLOSED          ? op.scheme->field_closed:
 429                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 430                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 431                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 432 }
 433
 434 void partial_show_minefield (int l, int c, int mode) {
 435         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 436         move_ph (l+LINE_OFFSET, field2screen_c(c));
 437         print (cell2schema(l, c, mode));
 438         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 439 }
 440
 441 char* get_emoticon(void) {
 442         return g.o==GAME_WON ? EMOT(WON):
 443                g.o==GAME_LOST? EMOT(DEAD):
 444                 EMOT(SMILE);
 445 }
 446
 447 /* https://zserge.com/blog/c-for-loop-tricks.html */
 448 #define print_line(which) \
 449         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 450                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 451 #define print_border(which, width) \
 452         print_line(which) printm (width, BORDER(which,MIDDLE))
 453 void show_minefield (int mode) {
 454         int dtime = difftime (time(NULL), g.t)*!!g.t;
 455         int half_spaces = f.w*op.scheme->cell_width/2;
 456         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 457         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 458         static char modechar[] = {'*', '!', '?'};
 459
 460         move_ph (0,0);
 461
 462         print_border(TOP, f.w);
 463         print_line(STATUS) {
 464                 printf("[%03d%c]%*s%s%*s[%03d]",
 465                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 466                   left_spaces,"", get_emoticon(), right_spaces,"",
 467                   /* [ */ dtime /* ] */);
 468         }
 469         print_border(DIVIDER, f.w);
 470         /* main body */
 471         for (int l = 0; l < f.h; l++) print_line(FIELD)
 472                 printm (f.w, cell2schema(l, _loop, mode));
 473         print_border(BOTTOM, f.w);
 474 }
 475
 476 int get_neighbours (int line, int col, int reduced_mode) {
 477         /* counts mines surrounding a square
 478            modes: 0=normal; 1=reduced */
 479
 480         int count = 0;
 481
 482         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 483                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 484                         if (!l && !c) continue;
 485
 486                         count += !!f.c[l][c].m;
 487                         count -= reduced_mode * f.c[l][c].f==FLAG;
 488                 }
 489         }
 490         return count;
 491 }
 492
 493 struct minecell** alloc_array (int lines, int cols) {
 494         free_field (); /* TODO: just memset */
 495         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 496         if (a == NULL) return NULL;
 497         for (int l = 0; l < lines; l++) {
 498                 a[l] = calloc (cols, sizeof(struct minecell));
 499                 if (a[l] == NULL) goto unalloc;
 500         }
 501
 502         return a;
 503 unalloc:
 504         for (int l = 0; l < lines; l++)
 505                 free (a[l]);
 506         return NULL;
 507 }
 508
 509 void free_field (void) {
 510         if (f.c == NULL) return;
 511         for (int l = 0; l < f.h; l++) {
 512                 free (f.c[l]);
 513         }
 514
 515         free (f.c);
 516         f.c = NULL;
 517 }
 518
 519 int screen2field_l (int l) {
 520         return (l-LINE_OFFSET) - 1;
 521 }
 522 int screen2field_c (int c) {
 523         /* this depends on the cell width and only works when it is 1 or 2. */
 524         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 525 }
 526 int field2screen_c (int c) {
 527         return (CW*c+COL_OFFSET - (CW%2));
 528 }
 529 int clicked_emoticon (unsigned char* mouse) {
 530         return (mouse[2] == LINE_OFFSET-1 && (
 531                 mouse[1] == f.w+COL_OFFSET ||
 532                 mouse[1] == f.w+COL_OFFSET+1));
 533 }
 534
 535 enum esc_states {
 536         START,
 537         ESC_SENT,
 538         CSI_SENT,
 539         MOUSE_EVENT,
 540 };
 541 int getctrlseq (unsigned char* buf) {
 542         int c;
 543         int state = START;
 544         int offset = 0x20; /* never sends control chars as data */
 545         while ((c = getchar()) != EOF) {
 546                 switch (state) {
 547                 case START:
 548                         switch (c) {
 549                         case '\033': state=ESC_SENT; break;
 550                         default: return c;
 551                         }
 552                         break;
 553                 case ESC_SENT:
 554                         switch (c) {
 555                         case '[': state=CSI_SENT; break;
 556                         default: return CTRSEQ_INVALID;
 557                         }
 558                         break;
 559                 case CSI_SENT:
 560                         switch (c) {
 561                         case 'A': return CTRSEQ_CURSOR_UP;
 562                         case 'B': return CTRSEQ_CURSOR_DOWN;
 563                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 564                         case 'D': return CTRSEQ_CURSOR_LEFT;
 565                         case 'M': state=MOUSE_EVENT; break;
 566                         default: return CTRSEQ_INVALID;
 567                         }
 568                         break;
 569                 case MOUSE_EVENT:
 570                         buf[0] = c - offset;
 571                         buf[1] = getchar() - offset;
 572                         buf[2] = getchar() - offset;
 573                         return CTRSEQ_MOUSE;
 574                 default:
 575                         return CTRSEQ_INVALID;
 576                 }
 577         }
 578         return 2;
 579 }
 580
 581 int getch(unsigned char* buf) {
 582 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 583 compatible with the ncurses implementation of same name */
 584         int action = getctrlseq(buf);
 585         int l, c;
 586         switch (action) {
 587         case CTRSEQ_MOUSE:
 588                 l = screen2field_l (buf[2]);
 589                 c = screen2field_c (buf[1]);
 590
 591                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 592                 int success = wait_mouse_up(l, c);
 593
 594                 /* mouse moved while pressed: */
 595                 if (!success) return CTRSEQ_INVALID;
 596
 597                 switch (buf[0]) {
 598                 case 0: return CTRSEQ_MOUSE_LEFT;
 599                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 600                 case 2: return CTRSEQ_MOUSE_RIGHT;
 601                 }
 602         }
 603
 604         return action;
 605 }
 606
 607 int getch_wrapper (void) {
 608         unsigned char mouse[3];
 609         int c = getch(mouse);
 610
 611         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 612                 if (clicked_emoticon(mouse))
 613                         return WRAPPER_EMOTICON;
 614
 615                 if (screen2field_c (mouse[1]) < 0
 616                  || screen2field_c (mouse[1]) >= f.w
 617                  || screen2field_l (mouse[2]) < 0
 618                  || screen2field_l (mouse[2]) >= f.h)
 619                         return CTRSEQ_INVALID;
 620
 621                 g.p[0] = screen2field_l (mouse[2]);
 622                 g.p[1] = screen2field_c (mouse[1]);
 623
 624                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 625         }
 626
 627         return c;
 628 }
 629
 630 int parse_fieldspec(char* str) {
 631         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 632         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 633         struct winsize w;
 634         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 635
 636         /* clamp field size to terminal size and mouse maximum: */
 637         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 638                 f.w = w.ws_col/CW - (COL_OFFSET+COL_OFFSET);
 639         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 640                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 641         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 642                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 643         if (LINE_OFFSET + f.h > MOUSE_MAX)
 644                 f.h = MOUSE_MAX - LINE_OFFSET;
 645
 646         if (n < 2) {
 647                 return 1; /* error */
 648         } else if (n == 2) {
 649                 if (f.w < 30) f.m = f.w*f.h*.15625;
 650                 else f.m = f.w*f.h*.20625;
 651         }
 652
 653         return 0;
 654 }
 655
 656 void timer_setup (int enable) {
 657         static struct itimerval tbuf;
 658         tbuf.it_interval.tv_sec  = 1;
 659         tbuf.it_interval.tv_usec = 0;
 660
 661         if (enable) {
 662                 g.t = time(NULL);
 663                 tbuf.it_value.tv_sec  = 1;
 664                 tbuf.it_value.tv_usec = 0;
 665                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 666                         perror("setitimer");
 667                         exit(1);
 668                 }
 669         } else {
 670                 tbuf.it_value.tv_sec  = 0;
 671                 tbuf.it_value.tv_usec = 0;
 672                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 673                         perror("setitimer");
 674                         exit(1);
 675                 }
 676         }
 677
 678 }
 679
 680 void signal_setup (void) {
 681         struct sigaction saction;
 682
 683         saction.sa_handler = signal_handler;
 684         sigemptyset(&saction.sa_mask);
 685         saction.sa_flags   = 0;
 686         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 687                 perror("SIGALRM");
 688                 exit(1);
 689         }
 690
 691         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 692                 perror ("SIGINT");
 693                 exit (1);
 694         }
 695 }
 696
 697 void signal_handler (int signum) {
 698         int dtime;
 699         switch (signum) {
 700         case SIGALRM:
 701                 dtime = difftime (time(NULL), g.t);
 702                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 703                 printf ("[%03d]", g.t?dtime:0);
 704                 break;
 705         case SIGINT:
 706                 exit(128+SIGINT);
 707         }
 708 }
 709
 710 void screen_setup (int enable) {
 711         if (enable) {
 712                 raw_mode(1);
 713                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 714                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 715                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 716                 print (op.scheme->init_seq); /* swich charset, if necessary */
 717         } else {
 718                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 719                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 720                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 721                 raw_mode(0);
 722         }
 723 }
 724
 725 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 726 void raw_mode(int enable) {
 727         static struct termios saved_term_mode;
 728         struct termios raw_term_mode;
 729
 730         if (enable) {
 731                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 732                 raw_term_mode = saved_term_mode;
 733                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 734                 raw_term_mode.c_cc[VMIN] = 1 ;
 735                 raw_term_mode.c_cc[VTIME] = 0;
 736                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 737         } else {
 738                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 739         }
 740 }