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
  48 struct minefield f;
  49 struct game g;
  50 struct opt op;
  51
  52 int main (int argc, char** argv) {
  53         /* defaults: */
  54         f.w = 30;
  55         f.h = 16;
  56         f.m = 99;
  57         op.scheme = &symbols_mono;
  58         op.mode = FLAG;
  59
  60         int optget;
  61         opterr = 0; /* don't print message on unrecognized option */
  62         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
  63                 switch (optget) {
  64                 case 'n': op.mode    = NOFLAG; break;
  65                 case 'f': op.mode    = FLAG; break; /*default*/
  66                 case 'q': op.mode    = QUESM; break;
  67                 case 'c': op.scheme  = &symbols_col1; break;
  68                 case 'd': op.scheme  = &symbols_doublewidth; break;
  69                 case 'h':
  70                 default:
  71                         fprintf (stderr, SHORTHELP LONGHELP, argv[0]);
  72                         return !(optget=='h');
  73                 }
  74         } if (optind < argc) { /* parse Fieldspec */
  75                 if (parse_fieldspec (argv[optind])) {
  76                         fprintf (stderr, "FIELDSPEC: WxH[xM]"
  77                         " (width 'x' height 'x' mines)\n");
  78                         return 1;
  79                 }
  80         }
  81
  82         /* check boundaries */
  83         if (f.m > (f.w-1) * (f.h-1)) {
  84                 f.m = (f.w-1) * (f.h-1);
  85                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m); //TODO: doesn't show up
  86         }
  87         /* end check */
  88
  89         signal_setup();
  90         screen_setup(1);
  91         atexit (*quit);
  92
  93 newgame:
  94         f.c = alloc_array (f.h, f.w);
  95         g = (const struct game){0}; /* reset all game-specific parameters */
  96
  97         struct line_col markers[26];
  98         for (int i=26; i; markers[--i].l = -1);
  99
 100         show_minefield (NORMAL);
 101
 102         while (1) {
 103                 int action;
 104                 unsigned char mouse[3];
 105
 106                 action = getch(mouse);
 107                 switch (action) {
 108                 case ' ':
 109                         if (g.s == MODE_OPEN ||
 110                             f.c[g.p[0]][g.p[1]].o == OPENED) {
 111                                 switch (do_uncover(&(g.n))) {
 112                                         case GAME_LOST: goto lose;
 113                                         case GAME_WON:  goto win;
 114                                 }
 115                         } else if (g.s == MODE_FLAG) {
 116                                 flag_square (g.p[0], g.p[1]);
 117                         } else if (g.s ==  MODE_QUESM) {
 118                                 quesm_square (g.p[0], g.p[1]); }
 119                         break;
 120                 case 'a':
 121                         g.s = (g.s+1)%(op.mode+1);
 122                         show_minefield (g.c?SHOWMINES:NORMAL);
 123                         break;
 124                 case CTRSEQ_MOUSE_LEFT:
 125                         if (clicked_emoticon(mouse)) {
 126                                 free_field ();
 127                                 goto newgame;
 128                         }
 129                         if (screen2field_c (mouse[1]) < 0    ||
 130                             screen2field_c (mouse[1]) >= f.w ||
 131                             screen2field_l (mouse[2]) <  0   ||
 132                             screen2field_l (mouse[2]) >= f.h)   break;
 133                         g.p[0] = screen2field_l (mouse[2]);
 134                         g.p[1] = screen2field_c (mouse[1]);
 135                         /* fallthrough */
 136                 case 'o':
 137                         switch (do_uncover(&(g.n))) {
 138                                 case GAME_LOST: goto lose;
 139                                 case GAME_WON:  goto win;
 140                         }
 141                         break;
 142                 case CTRSEQ_MOUSE_RIGHT:
 143                         if (screen2field_c (mouse[1]) < 0    ||
 144                             screen2field_c (mouse[1]) >= f.w ||
 145                             screen2field_l (mouse[2]) <  0   ||
 146                             screen2field_l (mouse[2]) >= f.h)   break;
 147                         g.p[0] = screen2field_l (mouse[2]);
 148                         g.p[1] = screen2field_c (mouse[1]);
 149                         /* fallthrough */
 150                 case 'i': flag_square (g.p[0], g.p[1]); break;
 151                 case '?':quesm_square (g.p[0], g.p[1]); break;
 152                 case CTRSEQ_CURSOR_LEFT:
 153                 case 'h': move_hi (g.p[0],   g.p[1]-1 ); break;
 154                 case CTRSEQ_CURSOR_DOWN:
 155                 case 'j': move_hi (g.p[0]+1, g.p[1]   ); break;
 156                 case CTRSEQ_CURSOR_UP:
 157                 case 'k': move_hi (g.p[0]-1, g.p[1]   ); break;
 158                 case CTRSEQ_CURSOR_RIGHT:
 159                 case 'l': move_hi (g.p[0],   g.p[1]+1 ); break;
 160                 case 'w': to_next_boundary (g.p[0], g.p[1], '>'); break;
 161                 case 'b': to_next_boundary (g.p[0], g.p[1], '<'); break;
 162                 case 'u': to_next_boundary (g.p[0], g.p[1], '^'); break;
 163                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v'); break;
 164                 case '0': /* fallthrough */
 165                 case '^': move_hi (g.p[0],    0        ); break;
 166                 case '$': move_hi (g.p[0],    f.w-1    ); break;
 167                 case 'g': move_hi (0,         g.p[1]   ); break;
 168                 case 'G': move_hi (f.h-1,     g.p[1]   ); break;
 169                 case 'z': move_hi (f.h/2, f.w/2); break;
 170                 case 'm':
 171                         action = tolower(getch(mouse));
 172                         if (action < 'a' || action > 'z') break;/*out of bound*/
 173                         markers[action-'a'].l = g.p[0];
 174                         markers[action-'a'].c = g.p[1];
 175                         break;
 176                 case'\'': /* fallthrough */
 177                 case '`':
 178                         action = tolower(getch(mouse));
 179                         if (action < 'a' || action > 'z' /* out of bound or */
 180                             || markers[action-'a'].l == -1) break; /* unset */
 181                         move_hi (markers[action-'a'].l, markers[action-'a'].c);
 182                         break;
 183                 case 'r': /* start a new game */
 184                         free_field ();
 185                         goto newgame;
 186                 case 'q':
 187                         goto quit;
 188                 case '\014': /* Ctrl-L -- redraw */
 189                         show_minefield (NORMAL);
 190                         break;
 191                 case '\\':
 192                         if (g.n == GAME_NEW) break; /* must open a cell first */
 193                         show_minefield (g.c?NORMAL:SHOWMINES);
 194                         g.c = !g.c;
 195                         break;
 196                 }
 197         }
 198
 199 win:    g.o = GAME_WON;  goto endgame;
 200 lose:   g.o = GAME_LOST; goto endgame;
 201 endgame:
 202         timer_setup(0); /* stop timer */
 203         show_minefield (SHOWMINES);
 204         int gotaction;
 205         do {
 206                 unsigned char mouse[3];
 207                 gotaction = getch(mouse);
 208                 if (gotaction==CTRSEQ_MOUSE_LEFT && clicked_emoticon(mouse)) {
 209                         free_field ();
 210                         goto newgame;
 211                 } else if (gotaction == 'r') {
 212                         free_field ();
 213                         goto newgame;
 214                 } else if (gotaction == 'q') {
 215                         goto quit;
 216                 }
 217         } while (1);
 218
 219 quit:
 220         return 0;
 221 }
 222
 223 void quit (void) {
 224         screen_setup(0);
 225         free_field ();
 226 }
 227
 228 /* I haven't won as long as a cell exists, that
 229     - I haven't opened, and
 230     - is not a mine */
 231 int everything_opened (void) {
 232         for (int row = 0; row < f.h; row++)
 233                 for (int col = 0; col < f.w; col++)
 234                         if (f.c[row][col].o == CLOSED &&
 235                             f.c[row][col].m == NO_MINE  ) return 0;
 236         return 1;
 237 }
 238
 239 int wait_mouse_up (int l, int c) {
 240         unsigned char mouse2[3];
 241         int level = 1;
 242         int l2, c2;
 243
 244         /* show :o face */
 245         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 246
 247         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 248                 /* show a pushed-in button if cursor is on minefield */
 249                 move_ph (l+LINE_OFFSET, field2screen_c(c));
 250                 fputs (op.scheme->mouse_highlight, stdout);
 251         }
 252
 253         while (level > 0) {
 254                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 255                         /* ignore mouse wheel events: */
 256                         if (mouse2[0] & 0x40) continue;
 257
 258                         else if (mouse2[0]&3 == 3) level--; /* release event */
 259                         else level++; /* another button pressed */
 260                 }
 261         }
 262
 263         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 264
 265         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 266                 partial_show_minefield (l, c, NORMAL);
 267         }
 268         c2 = screen2field_c(mouse2[1]);
 269         l2 = screen2field_l(mouse2[2]);
 270         return ((l2 == l) && (c2 == c));
 271 }
 272
 273 int choord_square (int line, int col) {
 274         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 275                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 276                         if (f.c[l][c].f != FLAG) {
 277                                 if (uncover_square (l, c))
 278                                          return 1;
 279                         }
 280                 }
 281         }
 282
 283         return 0;
 284 }
 285
 286 int uncover_square (int l, int c) {
 287         f.c[l][c].o = OPENED;
 288         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 289         partial_show_minefield (l, c, NORMAL);
 290
 291         if (f.c[l][c].m) {
 292                 f.c[l][c].m = DEATH_MINE;
 293                 return 1;
 294         }
 295
 296         /* check for chording */
 297         if (f.c[l][c].n == 0) {
 298                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 299                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 300                                 int newl = l + choord_l;
 301                                 int newc = c + choord_c;
 302                                 if (newl >= 0 && newl < f.h &&
 303                                     newc >= 0 && newc < f.w &&
 304                                     f.c[newl][newc].o == CLOSED &&
 305                                     uncover_square (newl, newc)) {
 306                                          return 1;
 307                                 }
 308                         }
 309                 }
 310         }
 311
 312         return 0;
 313 }
 314
 315 void flag_square (int l, int c) {
 316         static char modechar[] = {'*', '!', '?'};
 317
 318         if (f.c[l][c].o != CLOSED) return;
 319         /* cycle through flag/quesm/noflag: */
 320         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 321         if (f.c[l][c].f==FLAG) g.f++;
 322         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 323                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 324         partial_show_minefield (l, c, NORMAL);
 325         move_ph (1, op.scheme->cell_width);
 326         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 327 }
 328
 329 void quesm_square (int l, int c) {
 330         /* toggle question mark / none. won't turn flags into question marks.
 331         unlike flag_square, this function doesn't respect `-q'. */
 332         if      (f.c[l][c].o != CLOSED) return;
 333         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 334         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 335         partial_show_minefield (l, c, NORMAL);
 336 }
 337
 338 int do_uncover (int* is_newgame) {
 339         if (*is_newgame == GAME_NEW) {
 340                 *is_newgame = GAME_INPROGRESS;
 341                 fill_minefield (g.p[0], g.p[1]);
 342                 timer_setup(1);
 343         }
 344
 345         if (f.c[g.p[0]][g.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 346         if (f.c[g.p[0]][g.p[1]].o == CLOSED) {
 347                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 348         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 349                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 350         }
 351         if (everything_opened()) return GAME_WON;
 352
 353         return GAME_INPROGRESS;
 354 }
 355
 356 void fill_minefield (int l, int c) {
 357         srand (time(0));
 358         int mines_set = f.m;
 359         while (mines_set) {
 360                 int line = rand() % f.h;
 361                 int col = rand() % f.w;
 362
 363                 if (f.c[line][col].m) {
 364                 /* skip if field already has a mine */
 365                         continue;
 366                 } else if ((line == l) && (col == c)) {
 367                 /* don't put a mine on the already opened (first click) field */
 368                         continue;
 369                 } else {
 370                         mines_set--;
 371                         f.c[line][col].m = STD_MINE;
 372                 }
 373         }
 374
 375         /* precalculate neighbours */
 376         for (int l=0; l < f.h; l++)
 377                 for (int c=0; c < f.w; c++)
 378                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 379 }
 380
 381 void move_ph (int line, int col) {
 382         /* move printhead to zero-indexed position */
 383         printf ("\033[%d;%dH", line+1, col+1);
 384 }
 385
 386 void move_hi (int l, int c) {
 387         /* move cursor and highlight to absolute coordinates */
 388
 389         partial_show_minefield (g.p[0], g.p[1], NORMAL);
 390         /* update g.p */
 391         g.p[0] = CLAMP(l, 0, f.h-1);
 392         g.p[1] = CLAMP(c, 0, f.w-1);
 393         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 394
 395         print("\033[7m"); /* reverse video */
 396         partial_show_minefield (g.p[0], g.p[1], HIGHLIGHT);
 397         print("\033[0m"); /* un-invert */
 398 }
 399
 400 /* to_next_boundary(): move into the supplied direction until a change in open-
 401 state or flag-state is found and move there. falls back to BIG_MOVE. */
 402 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 403         new_ ## X OP ## = BIG_MOVE;\
 404         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 405                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 406                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 407                         new_ ## X = i OP 1;\
 408                         break;\
 409                 }\
 410         } while(0)
 411 void to_next_boundary (int l, int c, char direction) {
 412         int new_l = l;
 413         int new_c = c;
 414         switch (direction) {
 415         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 416         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 417         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 418         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 419         }
 420
 421         move_hi (new_l, new_c);
 422 }
 423 #undef FIND_NEXT
 424
 425 char* cell2schema (int l, int c, int mode) {
 426         struct minecell cell = f.c[l][c];
 427
 428         if (mode == SHOWMINES) return (
 429                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 430                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 431                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 432                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 433                 cell.o == CLOSED          ? op.scheme->field_closed:
 434                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 435          else return (
 436                 cell.f == FLAG            ? op.scheme->field_flagged:
 437                 cell.f == QUESM           ? op.scheme->field_question:
 438                 cell.o == CLOSED          ? op.scheme->field_closed:
 439                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 440                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 441                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 442 }
 443
 444 void partial_show_minefield (int l, int c, int mode) {
 445         move_ph (l+LINE_OFFSET, field2screen_c(c));
 446
 447         print (cell2schema(l, c, mode));
 448 }
 449
 450 char* get_emoticon(void) {
 451         return g.o==GAME_WON ? EMOT(WON):
 452                g.o==GAME_LOST? EMOT(DEAD):
 453                 EMOT(SMILE);
 454 }
 455
 456 /* https://zserge.com/blog/c-for-loop-tricks.html */
 457 #define print_line(which) \
 458         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 459                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 460 #define print_border(which, width) \
 461         print_line(which) printm (width, BORDER(which,MIDDLE))
 462 void show_minefield (int mode) {
 463         int dtime = difftime (time(NULL), g.t)*!!g.t;
 464         int half_spaces = f.w*op.scheme->cell_width/2;
 465         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 466         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 467         static char modechar[] = {'*', '!', '?'};
 468
 469         move_ph (0,0);
 470
 471         print_border(TOP, f.w);
 472         print_line(STATUS) {
 473                 printf("[%03d%c]%*s%s%*s[%03d]",
 474                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 475                   left_spaces,"", get_emoticon(), right_spaces,"",
 476                   /* [ */ dtime /* ] */);
 477         }
 478         print_border(DIVIDER, f.w);
 479         /* main body */
 480         for (int l = 0; l < f.h; l++) print_line(FIELD)
 481                 printm (f.w, cell2schema(l, _loop, mode));
 482         print_border(BOTTOM, f.w);
 483 }
 484
 485 int get_neighbours (int line, int col, int reduced_mode) {
 486         /* counts mines surrounding a square
 487            modes: 0=normal; 1=reduced */
 488
 489         int count = 0;
 490
 491         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 492                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 493                         if (!l && !c) continue;
 494
 495                         count += !!f.c[l][c].m;
 496                         count -= reduced_mode * f.c[l][c].f==FLAG;
 497                 }
 498         }
 499         return count;
 500 }
 501
 502 struct minecell** alloc_array (int lines, int cols) {
 503         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 504         if (a == NULL) return NULL;
 505         for (int l = 0; l < lines; l++) {
 506                 a[l] = calloc (cols, sizeof(struct minecell));
 507                 if (a[l] == NULL) goto unalloc;
 508         }
 509
 510         return a;
 511 unalloc:
 512         for (int l = 0; l < lines; l++)
 513                 free (a[l]);
 514         return NULL;
 515 }
 516
 517 void free_field (void) {
 518         if (f.c == NULL) return;
 519         for (int l = 0; l < f.h; l++) {
 520                 free (f.c[l]);
 521         }
 522
 523         free (f.c);
 524         f.c = NULL;
 525 }
 526
 527 int screen2field_l (int l) {
 528         return (l-LINE_OFFSET) - 1;
 529 }
 530 int screen2field_c (int c) {
 531         /* this depends on the cell width and only works when it is 1 or 2. */
 532         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 533 }
 534 int field2screen_c (int c) {
 535         return (CW*c+COL_OFFSET - (CW%2));
 536 }
 537 int clicked_emoticon (unsigned char* mouse) {
 538         return (mouse[2] == LINE_OFFSET-1 && (
 539                 mouse[1] == f.w+COL_OFFSET ||
 540                 mouse[1] == f.w+COL_OFFSET+1));
 541 }
 542
 543 enum esc_states {
 544         START,
 545         ESC_SENT,
 546         CSI_SENT,
 547         MOUSE_EVENT,
 548 };
 549 int getctrlseq (unsigned char* buf) {
 550         int c;
 551         int state = START;
 552         int offset = 0x20; /* never sends control chars as data */
 553         while ((c = getchar()) != EOF) {
 554                 switch (state) {
 555                 case START:
 556                         switch (c) {
 557                         case '\033': state=ESC_SENT; break;
 558                         default: return c;
 559                         }
 560                         break;
 561                 case ESC_SENT:
 562                         switch (c) {
 563                         case '[': state=CSI_SENT; break;
 564                         default: return CTRSEQ_INVALID;
 565                         }
 566                         break;
 567                 case CSI_SENT:
 568                         switch (c) {
 569                         case 'A': return CTRSEQ_CURSOR_UP;
 570                         case 'B': return CTRSEQ_CURSOR_DOWN;
 571                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 572                         case 'D': return CTRSEQ_CURSOR_LEFT;
 573                         case 'M': state=MOUSE_EVENT; break;
 574                         default: return CTRSEQ_INVALID;
 575                         }
 576                         break;
 577                 case MOUSE_EVENT:
 578                         buf[0] = c - offset;
 579                         buf[1] = getchar() - offset;
 580                         buf[2] = getchar() - offset;
 581                         return CTRSEQ_MOUSE;
 582                 default:
 583                         return CTRSEQ_INVALID;
 584                 }
 585         }
 586         return 2;
 587 }
 588
 589 int getch(unsigned char* buf) {
 590 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 591 compatible with the ncurses implementation of same name */
 592         int action = getctrlseq(buf);
 593         int l, c;
 594         switch (action) {
 595         case CTRSEQ_MOUSE:
 596                 l = screen2field_l (buf[2]);
 597                 c = screen2field_c (buf[1]);
 598
 599                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 600                 int success = wait_mouse_up(l, c);
 601
 602                 /* mouse moved while pressed: */
 603                 if (!success) return CTRSEQ_INVALID;
 604
 605                 switch (buf[0]) {
 606                 case 0: return CTRSEQ_MOUSE_LEFT;
 607                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 608                 case 2: return CTRSEQ_MOUSE_RIGHT;
 609                 }
 610         }
 611
 612         return action;
 613 }
 614
 615 int parse_fieldspec(char* str) {
 616         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 617         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 618         struct winsize w;
 619         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 620
 621         /* clamp field size to terminal size and mouse maximum: */
 622         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 623                 f.w = w.ws_col/CW - (COL_OFFSET+COL_OFFSET);
 624         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 625                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 626         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 627                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 628         if (LINE_OFFSET + f.h > MOUSE_MAX)
 629                 f.h = MOUSE_MAX - LINE_OFFSET;
 630
 631         if (n < 2) {
 632                 return 1; /* error */
 633         } else if (n == 2) {
 634                 if (f.w < 30) f.m = f.w*f.h*.15625;
 635                 else f.m = f.w*f.h*.20625;
 636         }
 637
 638         return 0;
 639 }
 640
 641 void timer_setup (int enable) {
 642         static struct itimerval tbuf;
 643         tbuf.it_interval.tv_sec  = 1;
 644         tbuf.it_interval.tv_usec = 0;
 645
 646         if (enable) {
 647                 g.t = time(NULL);
 648                 tbuf.it_value.tv_sec  = 1;
 649                 tbuf.it_value.tv_usec = 0;
 650                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 651                         perror("setitimer");
 652                         exit(1);
 653                 }
 654         } else {
 655                 tbuf.it_value.tv_sec  = 0;
 656                 tbuf.it_value.tv_usec = 0;
 657                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 658                         perror("setitimer");
 659                         exit(1);
 660                 }
 661         }
 662
 663 }
 664
 665 void signal_setup (void) {
 666         struct sigaction saction;
 667
 668         saction.sa_handler = signal_handler;
 669         sigemptyset(&saction.sa_mask);
 670         saction.sa_flags   = 0;
 671         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 672                 perror("SIGALRM");
 673                 exit(1);
 674         }
 675
 676         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 677                 perror ("SIGINT");
 678                 exit (1);
 679         }
 680 }
 681
 682 void signal_handler (int signum) {
 683         int dtime;
 684         switch (signum) {
 685         case SIGALRM:
 686                 dtime = difftime (time(NULL), g.t);
 687                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 688                 printf ("[%03d]", g.t?dtime:0);
 689                 break;
 690         case SIGINT:
 691                 exit(128+SIGINT);
 692         }
 693 }
 694
 695 void screen_setup (int enable) {
 696         if (enable) {
 697                 raw_mode(1);
 698                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 699                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 700                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 701                 print (op.scheme->init_seq); /* swich charset, if necessary */
 702         } else {
 703                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 704                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 705                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 706                 raw_mode(0);
 707         }
 708 }
 709
 710 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 711 void raw_mode(int enable) {
 712         static struct termios saved_term_mode;
 713         struct termios raw_term_mode;
 714
 715         if (enable) {
 716                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 717                 raw_term_mode = saved_term_mode;
 718                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 719                 raw_term_mode.c_cc[VMIN] = 1 ;
 720                 raw_term_mode.c_cc[VTIME] = 0;
 721                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 722         } else {
 723                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 724         }
 725 }