wordblox.h

   1 #ifndef __WORDBLOX_H
   2 #define __WORDBLOX_H
   3 #define _XOPEN_SOURCE
   4 #include <unistd.h>
   5 #include <stdbool.h>
   6 #include <string.h>
   7 #include <ctype.h>
   8 #include <gd.h>
   9 #include <gdfontmb.h>
  10 #include <gdfontg.h>
  11 #include <zlib.h>
  12 #include <openssl/conf.h>
  13 #include <openssl/evp.h>
  14 #include <openssl/err.h>
  15 #include "constantstrings.h"
  16
  17 #define MAX_PUZZLE_SIZE 25
  18 #define MAX_CLUE_LENGTH 150
  19 #define GRID_PIXELS 37
  20
  21 /* Enum to define terminal colours */
  22 enum COLOR {
  23         BLACK = 0,
  24         RED= 1,
  25         GREEN=2,
  26         YELLOW=3,
  27         BLUE=4,
  28         MAGENTA=5,
  29         CYAN=6,
  30         WHITE=7
  31 };
  32
  33 enum ATTR {
  34         NORMAL = 23,
  35         BOLD=1
  36 };
  37
  38 enum ORIENTATION {
  39         ACROSS=1,
  40         DOWN=2
  41 };
  42
  43 /* for use with the player */
  44 enum DIRECTION {
  45         DIR_FORWARD = 1,
  46         DIR_BACK = -1
  47 };
  48
  49 typedef char String[MAX_CLUE_LENGTH];
  50
  51 /* The main puzzle struct type */
  52 typedef struct {
  53         char chars[MAX_PUZZLE_SIZE][MAX_PUZZLE_SIZE];
  54         int start_across_word[MAX_PUZZLE_SIZE][MAX_PUZZLE_SIZE];
  55         int start_down_word[MAX_PUZZLE_SIZE][MAX_PUZZLE_SIZE];
  56         String clue_across[MAX_PUZZLE_SIZE][MAX_PUZZLE_SIZE];
  57         String clue_down[MAX_PUZZLE_SIZE][MAX_PUZZLE_SIZE];
  58         int grid_size;
  59         bool grid_frozen;
  60         char hashed_master_password[256];
  61         char hashed_solution_password[256];
  62 } Puzzle;
  63
  64 /* The player data struct type - for the player app */
  65 typedef struct {
  66         Puzzle puzzle;
  67         char filename[65535];
  68         bool is_loaded;
  69         char char_ans[MAX_PUZZLE_SIZE][MAX_PUZZLE_SIZE];
  70         int cur_row;
  71         int cur_col;
  72         bool solution_revealed;
  73         enum ORIENTATION current_movement;
  74 } MainPlayerData;
  75
  76 /* compute the hash of a password */
  77 void digest_message(const unsigned char *message,
  78         size_t message_len, unsigned char **digest, unsigned int *digest_len)
  79 {
  80         EVP_MD_CTX *mdctx;
  81
  82         if((mdctx = EVP_MD_CTX_new()) == NULL)
  83                 goto err;
  84
  85         if(1 != EVP_DigestInit_ex(mdctx, EVP_sha256(), NULL))
  86                 goto err;
  87
  88         if(1 != EVP_DigestUpdate(mdctx, message, message_len))
  89                 goto err;
  90
  91         if((*digest = (unsigned char *)
  92                 OPENSSL_malloc(EVP_MD_size(EVP_sha256()))) == NULL)
  93                 goto err;
  94
  95         if(1 != EVP_DigestFinal_ex(mdctx, *digest, digest_len))
  96                 goto err;
  97
  98         EVP_MD_CTX_free(mdctx);
  99         return;
 100 err:
 101         EVP_MD_CTX_free(mdctx);
 102         ERR_print_errors_fp(stderr);
 103         exit (2);
 104 }
 105
 106 /* convert the hashed binary password to hexadecimal representation and
 107    free the hashed binary password */
 108 void to_hexadecimal (char *hex, unsigned char *binary_pwd, unsigned int len)
 109 {
 110         char buf[3];
 111         /* keep reference to beginning of the hashed password */
 112         unsigned char *binary_pw_begin = binary_pwd;
 113         for (int i = 0; i < len; i ++)
 114         {
 115                 sprintf (buf, "%02x", (*binary_pwd)&0xff);
 116                 strcat (hex, buf);
 117                 binary_pwd ++;
 118         }
 119         /* free the hashed password */
 120         OPENSSL_free (binary_pw_begin);
 121 }
 122
 123 /* get a number from the user */
 124 int get_num ()
 125 {
 126         char s[5];
 127         fgets (s, 5, stdin);
 128         int n = atoi (s);
 129         return n;
 130 }
 131
 132 /* verify solution password */
 133 bool verify_solution_password (Puzzle *p, const char* password)
 134 {
 135         /* no password set */
 136         if (strcmp (p->hashed_solution_password, "\0") == 0)
 137                 return true;
 138
 139         /* hash the user input password and compare it with the stored password */
 140         unsigned char* hashed_sol_password;
 141         unsigned int len;
 142         digest_message ((const unsigned char *)password, strlen(password),
 143                                                 &hashed_sol_password, &len);
 144         char hashed_hex_pwd[256] = { (char) NULL };
 145         to_hexadecimal (hashed_hex_pwd, hashed_sol_password, len);
 146
 147         if (strcmp (p->hashed_solution_password, hashed_hex_pwd) == 0)
 148                 return true;
 149
 150         return false;
 151 }
 152
 153
 154 /* verify master password */
 155 bool verify_master_password (Puzzle *p, const char* password)
 156 {
 157         /* no password set */
 158         if (strcmp (p->hashed_master_password, "\0") == 0)
 159                 return true;
 160
 161         /* hash the user input password and compare it with the stored password */
 162         unsigned char* hashed_mas_password;
 163         unsigned int len;
 164         digest_message ((const unsigned char *)password, strlen(password),
 165                                                 &hashed_mas_password, &len);
 166         char hashed_hex_pwd[256] = { (char) NULL };
 167         to_hexadecimal (hashed_hex_pwd, hashed_mas_password, len);
 168
 169         if (strcmp (p->hashed_master_password, hashed_hex_pwd) == 0)
 170                 return true;
 171
 172         return false;
 173 }
 174
 175 /* Set or reset solution password for puzzle */
 176 void set_solution_password (Puzzle *p, const char *password)
 177 {
 178         /* if it is a null string, reset the password */
 179         if (strcmp (password, "\0") == 0)
 180                 strcpy (p->hashed_solution_password, "\0");
 181         else
 182         {
 183
 184                 unsigned char* hashedpwd;
 185                 unsigned int len;
 186                 digest_message ((const unsigned char *)password, strlen(password),
 187                                                 &hashedpwd, &len);
 188                 /* the hashedpwd contains binary data - we will convert it to
 189                    hexadecimal data and store in file */
 190
 191                 to_hexadecimal (p->hashed_solution_password, hashedpwd, len);
 192         }
 193 }
 194
 195 /* Set or reset master password for puzzle */
 196 void set_master_password (Puzzle *p, const char *password)
 197 {
 198         /* if it is a null string, reset the password */
 199         if (strcmp (password, "\0") == 0)
 200                 strcpy (p->hashed_master_password, "\0");
 201         else
 202         {
 203
 204                 unsigned char* hashedpwd;
 205                 unsigned int len;
 206                 digest_message ((const unsigned char *)password, strlen(password),
 207                                                 &hashedpwd, &len);
 208                 /* the hashedpwd contains binary data - we will convert it to
 209                    hexadecimal data and store in file */
 210
 211                 to_hexadecimal (p->hashed_master_password, hashedpwd, len);
 212         }
 213 }
 214
 215 /* Output the clues to text file */
 216 void export_clues (Puzzle *p, const char *filename)
 217 {
 218         FILE *outfile = fopen (filename, "w");
 219         if (outfile == NULL)
 220         {
 221                 fprintf (stderr, "%s\n", ERROR_WRITING_FILE);
 222                 exit (1);
 223         }
 224         /* first the across clues */
 225         fprintf (outfile, "ACROSS CLUES\n");
 226         for (int i = 0; i < p->grid_size; i ++)
 227         {
 228                 for (int j = 0; j < p->grid_size; j ++)
 229                 {
 230                         if (p->start_across_word[i][j] != -1)
 231                                 fprintf (outfile, "%d - %s\n", p->start_across_word[i][j],
 232                                                         p->clue_across[i][j]);
 233                 }
 234         }
 235         /* now the down clues */
 236         fprintf (outfile, "DOWN CLUES\n");
 237         for (int i = 0; i < p->grid_size; i ++)
 238         {
 239                 for (int j = 0; j < p->grid_size; j ++)
 240                 {
 241                         if (p->start_down_word[i][j] != -1)
 242                                 fprintf (outfile, "%d - %s\n", p->start_down_word[i][j],
 243                                                         p->clue_down[i][j]);
 244                 }
 245         }
 246         fclose (outfile);
 247 }
 248
 249 /* Output the grid to image - if answerkey is true export filled grid */
 250 void export_grid_image  (Puzzle *p, const char *filename, bool answerkey)
 251 {
 252         int img_size = p->grid_size * GRID_PIXELS;
 253         FILE * outfile = fopen (filename, "wb");
 254         if (outfile == NULL)
 255         {
 256                 fprintf (stderr, "%s\n", ERROR_WRITING_FILE);
 257                 exit (1);
 258         }
 259
 260         gdImagePtr img = gdImageCreate (img_size, img_size);
 261         gdImageColorAllocate (img, 255,255,255);
 262         int black = gdImageColorAllocate (img, 0, 0, 0);
 263         int blue = gdImageColorAllocate (img, 0, 0, 216);
 264         gdFontPtr sm_fnt = gdFontGetMediumBold ();
 265         gdFontPtr lg_fnt = gdFontGetGiant ();
 266
 267         for (int i = 0; i < p->grid_size; i ++)
 268         {
 269                 for (int j = 0; j < p->grid_size; j++)
 270                 {
 271                         /* if it is a block, draw the black square */
 272                         if (p->chars[i][j] == '#')
 273                                 gdImageFilledRectangle (img, j*GRID_PIXELS, i*GRID_PIXELS,
 274                                                                                 j*GRID_PIXELS+GRID_PIXELS,
 275                                                                                 i*GRID_PIXELS+GRID_PIXELS,black);
 276                         else
 277                         {
 278                                 /* draw a regular square */
 279                                 gdImageRectangle (img, j*GRID_PIXELS, i*GRID_PIXELS,
 280                                                                                 j*GRID_PIXELS+GRID_PIXELS,
 281                                                                         i*GRID_PIXELS+GRID_PIXELS, black);
 282
 283                                 /* print the numers, if it is either start across word or
 284                                 a down word */
 285                                 if (p->start_across_word[i][j] != -1 ||
 286                                                 p->start_down_word[i][j] != -1)
 287                                 {
 288                                         if (p->start_across_word[i][j] != -1)
 289                                         {
 290                                                 char str[5];
 291                                                 sprintf (str, "%d", p->start_across_word[i][j]);
 292                                                 gdImageString (img,  sm_fnt, j*GRID_PIXELS+2,
 293                                                                                 i*GRID_PIXELS+2,
 294                                                                                 (unsigned char *)str, blue);
 295                                         }
 296                                         else
 297                                         {
 298                                                 char str[5];
 299                                                 sprintf (str, "%d", p->start_down_word[i][j]);
 300                                                 gdImageString (img,  sm_fnt, j*GRID_PIXELS+2,
 301                                                                                 i*GRID_PIXELS+2,
 302                                                                                 (unsigned char *)str, blue);
 303                                         }
 304                                 }
 305                                 /* if answerkey is true, draw the character in the cell */
 306                                 if (answerkey)
 307                                 {
 308                                         gdImageChar (img, lg_fnt, j*GRID_PIXELS+15,
 309                                                                         i*GRID_PIXELS+10, p->chars[i][j], black);
 310                                 }
 311                         }
 312                 }
 313         }
 314
 315         gdImagePng (img, outfile);
 316         gdImageDestroy (img);
 317         fclose (outfile);
 318 }
 319
 320 /* Set the terminal colour */
 321 void set_color (enum COLOR fg, enum COLOR bg, enum ATTR at) {
 322         printf ("\x1B[%d;%d;%dm", fg+30, bg+40, at);
 323 }
 324
 325 /* Reset the terminal colour */
 326 void reset_color () {
 327         printf ("\x1B[0m");
 328 }
 329
 330 /* check if the prev row has a block or not */
 331 bool prev_row_block (Puzzle *p, int r, int c)
 332 {
 333         if (r == 0)
 334                 return true;
 335         if (p->chars[r-1][c] == '#')
 336                 return true;
 337         return false;
 338 }
 339
 340 /* check if the next row has a block or not */
 341 bool next_row_block (Puzzle *p, int r, int c)
 342 {
 343         if (r == p->grid_size-1)
 344                 return true;
 345         if (p->chars[r+1][c] == '#')
 346                 return true;
 347         return false;
 348 }
 349
 350 /* check if the prev col has a block or not */
 351 bool prev_col_block (Puzzle *p, int r, int c)
 352 {
 353         if (c == 0)
 354                 return true;
 355         if (p->chars[r][c-1] == '#')
 356                 return true;
 357         return false;
 358 }
 359
 360 /* check if the next col has a block or not */
 361 bool next_col_block (Puzzle *p, int r, int c)
 362 {
 363         if (c == p->grid_size - 1)
 364                 return true;
 365         if (p->chars[r][c+1] == '#')
 366                 return true;
 367         return false;
 368 }
 369
 370 /* check if previous row is blank or not */
 371 bool prev_row_blank (Puzzle *p, int r, int c)
 372 {
 373         if (r == 0) return true;
 374         if (p->chars[r-1][c] == ' ' || p->chars[r-1][c] == '#') return true;
 375         return false;
 376 }
 377 /* check if next row is blank or not */
 378 bool next_row_blank (Puzzle *p, int r, int c)
 379 {
 380         if (r == p->grid_size - 1) return true;
 381         if (p->chars[r+1][c] == ' ' || p->chars[r+1][c] == '#') return true;
 382         return false;
 383 }
 384 /* check if previous col is blank or not */
 385 bool prev_col_blank (Puzzle *p, int r, int c)
 386 {
 387         if (c == 0) return true;
 388         if (p->chars[r][c-1] == ' ' || p->chars[r][c-1] == '#') return true;
 389         return false;
 390 }
 391 /* check if the next col is blank or not */
 392 bool next_col_blank (Puzzle *p, int r, int c)
 393 {
 394         if (c == p->grid_size -1) return true;
 395         if (p->chars[r][c+1] == ' ' || p->chars[r][c+1] == '#') return true;
 396         return false;
 397 }
 398
 399 /* set the current row/col to the beginning of word index (across or down) */
 400 void set_selection_to_word_start (MainPlayerData *app_data,
 401                                                                  enum ORIENTATION orient, int word_index)
 402 {
 403         for (int i = 0; i < app_data->puzzle.grid_size; i ++)
 404         {
 405                 for (int j = 0; j < app_data->puzzle.grid_size; j ++)
 406                 {
 407                         if (orient == ACROSS &&
 408                                 app_data->puzzle.start_across_word[i][j] == word_index)
 409                         {
 410                                 app_data->current_movement = ACROSS;
 411                                 app_data->cur_row = i;
 412                                 app_data->cur_col = j;
 413                                 break;
 414                         }
 415                         else if (orient == DOWN &&
 416                                 app_data->puzzle.start_down_word[i][j] == word_index)
 417                         {
 418                                 app_data->current_movement = DOWN;
 419                                 app_data->cur_row = i;
 420                                 app_data->cur_col = j;
 421                                 break;
 422                         }
 423                 }
 424         }
 425 }
 426
 427 /* unfreeze the grid - make editing possible to change words */
 428 void unfreeze_puzzle (Puzzle *p)
 429 {
 430         for (int i = 0; i < p->grid_size; i ++)
 431         {
 432                 for (int j = 0; j < p->grid_size; j ++)
 433                 {
 434                         if (p->chars[i][j] == '#')
 435                                 p->chars[i][j] = ' ';
 436
 437                         p->start_across_word[i][j] = -1;
 438                         p->start_down_word[i][j] = -1;
 439                 }
 440         }
 441         p->grid_frozen = false;
 442 }
 443
 444 /* freeze the grid - make editing impossible because it finalizes the
 445    across and down words in the grid */
 446 void freeze_puzzle (Puzzle *p)
 447 {
 448         int word_num = 1;
 449         bool across_word_start, down_word_start;
 450         for (int i = 0; i < p->grid_size; i ++)
 451         {
 452                 for (int j = 0; j < p->grid_size; j++)
 453                 {
 454                         across_word_start = false;
 455                         down_word_start = false;
 456                         /* if it is a blank cell - cover it with a block */
 457                         if (p->chars[i][j] == ' ' || p->chars[i][j] == '#')
 458                                 p->chars[i][j] = '#';
 459                         /* it is not a blank cell - check all possibilities */
 460                         else
 461                         {
 462                                 bool prev_row = prev_row_blank (p, i, j);
 463                                 bool next_row = next_row_blank (p, i, j);
 464                                 bool prev_col = prev_col_blank (p, i, j);
 465                                 bool next_col = next_col_blank (p, i, j);
 466                                 if (prev_row && ! next_row)
 467                                         down_word_start = true;
 468                                 if (prev_col && ! next_col)
 469                                         across_word_start = true;
 470                         }
 471
 472                         if (across_word_start == true)
 473                                 p->start_across_word[i][j] = word_num;
 474                         else
 475                                 p->start_across_word[i][j] = -1;
 476                         if (down_word_start == true)
 477                                 p->start_down_word[i][j] = word_num;
 478                         else
 479                                 p->start_down_word[i][j] = -1;
 480                         if (across_word_start == true || down_word_start == true)
 481                                 word_num ++;
 482                 }
 483         }
 484         p->grid_frozen = true;
 485 }
 486
 487 /* reset the entire grid */
 488 void init_puzzle (Puzzle *p, int grid_size)
 489 {
 490         p->grid_size = grid_size;
 491         p->grid_frozen = false;
 492         for (int i = 0; i < p->grid_size; i ++)
 493         {
 494                 for (int j = 0; j < p->grid_size; j ++)
 495                 {
 496                         p->chars[i][j] = ' ';
 497                         p->start_across_word[i][j] = -1;
 498                         p->start_down_word[i][j] = -1;
 499                         strcpy (p->clue_across[i][j], "");
 500                         strcpy (p->clue_down[i][j], "");
 501                 }
 502         }
 503         strcpy (p->hashed_master_password, "\0");
 504         strcpy (p->hashed_solution_password, "\0");
 505
 506 }
 507
 508 /* save the puzzle to a file */
 509 void save_puzzle (Puzzle *puzzle, const char* file) {
 510         FILE *outfile;
 511         /* First output the uncompressed contents to a temp file */
 512         outfile = tmpfile ();
 513         if (outfile == NULL)
 514         {
 515                 fprintf (stderr, "%s\n", ERROR_WRITING_FILE);
 516                 exit (1);
 517         }
 518         /* grid size is the first field */
 519         fprintf (outfile, "%d\n", puzzle->grid_size);
 520         /* whether grid is frozen or not */
 521         fprintf (outfile, "%d\n", puzzle->grid_frozen);
 522         /* the hashed password */
 523         fprintf (outfile, "%s\n", puzzle->hashed_master_password);
 524         /* the hashed_solution_password */
 525         fprintf (outfile, "%s\n", puzzle->hashed_solution_password);
 526
 527         /* First output the grid characters columns/rows */
 528         for (int i = 0; i < puzzle->grid_size; i ++)
 529         {
 530                 for (int j = 0; j < puzzle->grid_size; j ++)
 531                         fprintf (outfile, "%c", puzzle->chars[i][j]);
 532                 fprintf (outfile, "\n");
 533         }
 534
 535         /* Next output the start across/down numbers */
 536         for (int i = 0; i < puzzle->grid_size; i ++)
 537         {
 538                 for (int j = 0; j < puzzle->grid_size; j++)
 539                 {
 540                         fprintf (outfile, "%d ", puzzle->start_across_word[i][j]);
 541                         fprintf (outfile, "%d ", puzzle->start_down_word[i][j]);
 542                 }
 543                 fprintf (outfile, "\n");
 544         }
 545
 546         /* Output the across clues */
 547         fprintf (outfile, "ACROSS\n");
 548         /* Search the grid for across words */
 549         for (int i = 0; i < puzzle->grid_size; i ++)
 550         {
 551                 for (int j = 0; j < puzzle->grid_size; j++)
 552                 {
 553                         /* if it is an across word, then put the word index followed by
 554                         tab character (as separator) and the clue */
 555                         if (puzzle->start_across_word[i][j] != -1)
 556                                 fprintf (outfile, "%d\t%s\n", puzzle->start_across_word[i][j],
 557                                         puzzle->clue_across[i][j]);
 558                 }
 559         }
 560
 561         /* Output the down clues */
 562         fprintf (outfile, "DOWN\n");
 563         /* Search the grid for down words */
 564         for (int i = 0; i < puzzle->grid_size; i ++)
 565         {
 566                 for (int j = 0; j < puzzle->grid_size; j++)
 567                 {
 568                         /* same as across word, put the word index followed by the tab
 569                         character and then the clue */
 570                         if (puzzle->start_down_word[i][j] != -1)
 571                                 fprintf (outfile, "%d\t%s\n", puzzle->start_down_word[i][j],
 572                                         puzzle->clue_down[i][j]);
 573                 }
 574         }
 575
 576         /* Flush the buffer and rewind to beginning - to read and save into
 577         gzip compressed file */
 578         fflush (outfile);
 579         fseek (outfile, 0, 0);
 580
 581         /* now compress the file and save it to destination file */
 582         gzFile outdestfile = gzopen (file, "wb");
 583         if (outdestfile == NULL)
 584         {
 585                 fprintf (stderr, "%s\n", ERROR_WRITING_FILE);
 586                 fclose (outfile);
 587                 exit (1);
 588         }
 589         char buf[128];
 590         int num = fread (buf, sizeof(char), sizeof(char)*128, outfile);
 591         while (num > 0)
 592         {
 593                 int res = gzwrite (outdestfile, buf, num*sizeof(char) );
 594                 if (res == 0)
 595                 {
 596                         fprintf (stderr, "%s %s\n", ERROR_WRITING_FILE, COMPRESSED);
 597                         fclose (outfile);
 598                         exit (1);
 599                 }
 600                 num = fread (buf, sizeof(char), sizeof(char)*128, outfile);
 601         }
 602         gzclose (outdestfile);
 603         fclose (outfile);
 604
 605 }
 606
 607 /* read the puzzle from a file */
 608 Puzzle load_puzzle (const char* file) {
 609         /* First open the GZip file */
 610         gzFile insourcefile = gzopen (file, "rb");
 611         if (insourcefile == NULL)
 612         {
 613                 fprintf (stderr, "%s %s\n", ERROR_READING_FILE, COMPRESSED);
 614                 exit (1);
 615         }
 616         /* Open a temporary file to uncompress the contents */
 617         FILE *infile = tmpfile ();
 618         if (infile == NULL)
 619         {
 620                 fprintf (stderr, "%s\n", ERROR_READING_FILE);
 621                 exit (1);
 622         }
 623         /* Put the uncompressed content to the temp file */
 624         char buf[128];
 625         int num = 0;
 626         num = gzread (insourcefile, buf, 128);
 627         while (num > 0)
 628         {
 629                 int res = fwrite (buf, 1, num, infile);
 630                 if (res == 0)
 631                 {
 632                         fprintf (stderr, "%s\n", ERROR_READING_FILE);
 633                         fclose (infile);
 634                         gzclose (insourcefile);
 635                         exit (1);
 636                 }
 637                 num = gzread (insourcefile, buf, 128);
 638         }
 639         /* Close the gzip file */
 640         gzclose (insourcefile);
 641         /* Flush the temp file buffer and rewind to beginning */
 642         fflush (infile);
 643         fseek (infile, 0, 0);
 644
 645         /* Read the temporary file contents to the structure Puzzle */
 646         Puzzle p;
 647         char line[MAX_CLUE_LENGTH+10];
 648         fgets (line, MAX_CLUE_LENGTH + 10, infile);
 649         p.grid_size = atoi (line);
 650         fgets (line, MAX_CLUE_LENGTH + 10, infile);
 651         p.grid_frozen = atoi (line) == 0 ? false : true ;
 652         fgets (line, MAX_CLUE_LENGTH + 10, infile);
 653         if (strlen (line) != 1)
 654                 strcpy (p.hashed_master_password, strtok (line, "\n"));
 655         else
 656                 strcpy (p.hashed_master_password, "\0");
 657         fgets (line, MAX_CLUE_LENGTH + 10, infile);
 658         if (strlen (line) != 1)
 659                 strcpy (p.hashed_solution_password, strtok (line, "\n"));
 660         else
 661                 strcpy (p.hashed_solution_password, "\0");
 662
 663         /* read each character of the grid */
 664         for (int i = 0; i < p.grid_size; i ++ )
 665         {
 666                 fgets (line, MAX_CLUE_LENGTH + 10, infile);
 667                 for (int j = 0; j < p.grid_size; j ++)
 668                         p.chars[i][j] = line[j];
 669         }
 670         /* read the word numbers */
 671         for (int i = 0; i < p.grid_size; i ++)
 672         {
 673                 fgets (line, MAX_CLUE_LENGTH + 10, infile);
 674                 char *token = strtok (line, " ");
 675                 for (int j = 0; j < p.grid_size; j ++)
 676                 {
 677                         if (token != NULL)
 678                                 p.start_across_word[i][j] = atoi (token);
 679                         token = strtok (NULL, " ");
 680                         if (token != NULL)
 681                                 p.start_down_word[i][j] = atoi (token);
 682                         token = strtok (NULL, " ");
 683                 }
 684         }
 685         /* read the clues */
 686         fgets (line, MAX_CLUE_LENGTH + 10, infile);
 687
 688         /* across clues */
 689         char clues[100][MAX_CLUE_LENGTH];
 690         int word_num[100];
 691         int c = 0;
 692         /* first read the across clues from file */
 693         while (1)
 694         {
 695                 fgets (line, MAX_CLUE_LENGTH + 10, infile);
 696                 /* if reached the end of across clues */
 697                 if (strcmp (line, "DOWN\n") == 0)
 698                         break;
 699                 word_num[c] = atoi (strtok (line, "\t"));
 700                 char *cl = strtok (NULL, "\n");
 701                 if (cl != NULL)
 702                         strcpy (clues[c], cl);
 703                 else
 704                         strcpy (clues[c], "\0");
 705                 c++;
 706         }
 707         /* set the clue to the correct cell in grid */
 708         for (int i = 0; i < p.grid_size; i ++)
 709         {
 710                 for (int j = 0; j < p.grid_size; j ++)
 711                 {
 712                         for (int r = 0; r < c; r ++)
 713                                 if (p.start_across_word[i][j] == word_num[r])
 714                                         strcpy (p.clue_across[i][j], clues[r]);
 715                 }
 716         }
 717
 718         /* down clues */
 719         c = 0;
 720         while (fgets (line, MAX_CLUE_LENGTH + 10, infile))
 721         {
 722                 word_num[c] = atoi (strtok (line, "\t"));
 723                 char* cl = strtok (NULL, "\n");
 724                 if (cl != NULL)
 725                         strcpy (clues[c], cl);
 726                 else
 727                         strcpy (clues[c], "\0");
 728                 c++;
 729         }
 730         for (int i = 0; i < p.grid_size; i ++)
 731         {
 732                 for (int j = 0; j < p.grid_size; j ++)
 733                 {
 734                         for (int r = 0; r < c; r ++)
 735                                 if (p.start_down_word[i][j] == word_num[r])
 736                                         strcpy (p.clue_down[i][j], clues[r]);
 737                 }
 738         }
 739
 740         fclose (infile);
 741         return p;
 742 }
 743
 744 /* display the puzzle */
 745 void print_puzzle (Puzzle *p)
 746 {
 747         printf ("\n");
 748         set_color (WHITE, CYAN, NORMAL);
 749         printf ("    ");
 750         for (int i = 0; i < p->grid_size; i ++)
 751                 printf ("%3d", i);
 752         reset_color ();
 753         printf("\n");
 754         for (int i = 0; i < p->grid_size; i ++)
 755         {
 756                 set_color (WHITE, CYAN, NORMAL);
 757                 printf ("%3d ", i);
 758                 for (int j = 0; j < p->grid_size; j ++)
 759                 {
 760                         if (p->chars[i][j] == '#') {
 761                                 set_color (WHITE, BLACK, NORMAL);
 762                                 printf ("   ");
 763                         }
 764                         else
 765                         {
 766                                 if (p->start_across_word[i][j] != -1 ||
 767                                         p->start_down_word[i][j] != -1)
 768                                 {
 769                                         set_color (BLUE, WHITE, NORMAL);
 770                                         if (p->start_across_word[i][j] != -1)
 771                                                 printf ("%-2d", p->start_across_word[i][j]);
 772                                         else
 773                                                 printf ("%-2d", p->start_down_word[i][j]);
 774                                 }
 775                                 else
 776                                 {
 777                                         set_color (BLACK, WHITE,NORMAL);
 778                                         printf ("  ");
 779                                 }
 780
 781                                 set_color (BLACK, WHITE, BOLD);
 782                                 printf ("%c", p->chars[i][j]);
 783                         }
 784                         reset_color ();
 785                 }
 786                 printf ("\n");
 787         }
 788         /* print the clues if set */
 789         if (p->grid_frozen == true)
 790         {
 791                 printf ("\x1B[1mACROSS - CLUES\x1B[0m\n");
 792                 for (int i = 0; i < p->grid_size; i ++)
 793                 {
 794                         for (int j = 0; j < p->grid_size; j ++)
 795                         {
 796                                 if (p->start_across_word[i][j] != -1)
 797                                 {
 798                                         printf ("%d - %s; ", p->start_across_word[i][j],
 799                                                                 p->clue_across[i][j]);
 800                                 }
 801                         }
 802                 }
 803                 printf ("\n\x1B[1mDOWN - CLUES\x1B[0m\n");
 804                 for (int i = 0; i < p->grid_size; i ++)
 805                 {
 806                         for (int j = 0; j < p->grid_size; j ++)
 807                         {
 808                                 if (p->start_down_word[i][j] != -1)
 809                                 {
 810                                         printf ("%d - %s; ", p->start_down_word[i][j],
 811                                                                 p->clue_down[i][j]);
 812                                 }
 813                         }
 814                 }
 815                 printf ("\n");
 816         }
 817 }
 818
 819 /* function to check if a word is valid or not */
 820 char* is_valid_word (char *word)
 821 {
 822         if (word == NULL || strlen(word) == 0)
 823                 return NULL;
 824         for (int i = 0; i < strlen (word) - 1; i ++)
 825                 if (! isalpha (word[i]))
 826                         return NULL;
 827
 828         return strtok (word, "\n");
 829 }
 830
 831
 832 /* function to set a clue for an across word */
 833 bool set_clue (Puzzle *p, String clue, int index, enum ORIENTATION order)
 834 {
 835         for (int i = 0; i < p->grid_size; i ++)
 836         {
 837                 for (int j = 0; j < p->grid_size; j ++)
 838                 {
 839                         if (order == ACROSS)
 840                         {
 841                                 if (p->start_across_word[i][j] == index)
 842                                 {
 843                                         strcpy (p->clue_across[i][j], clue);
 844                                         return true;
 845                                 }
 846                         }
 847                         else if (order == DOWN)
 848                         {
 849                                 if (p->start_down_word[i][j] == index)
 850                                 {
 851                                         strcpy (p->clue_down[i][j], clue);
 852                                         return true;
 853                                 }
 854                         }
 855                 }
 856         }
 857         return false;
 858 }
 859
 860 /* function to print a menu */
 861 void print_menu (enum COLOR fg, enum COLOR bg, const char* title,
 862                                         char **items, int num_items, int padding)
 863 {
 864                 /* clear screen */
 865                 printf ("\e[1;1H\e[2J");
 866                 set_color (fg, bg, NORMAL);
 867                 printf ("\u2554");
 868                 for (int i = 0; i < padding; i ++)
 869                         printf ("\u2550");
 870                 printf ("\u2557");
 871                 reset_color (); printf ("\n");
 872                 set_color (fg, bg, NORMAL);
 873                 printf ("\u2551");
 874                 set_color (fg, bg, BOLD);
 875                 printf ("%-*s", padding, title);
 876                 reset_color ();
 877                 set_color (fg, bg, NORMAL);
 878                 printf ("\u2551");
 879                 reset_color (); printf ("\n");
 880                 set_color (fg, bg, NORMAL);
 881                 printf ("\u2560");
 882                 for (int i = 0; i < padding; i ++)
 883                         printf ("\u2550");
 884                 printf ("\u2563");
 885                 reset_color (); printf ("\n");
 886                 for (int i = 0; i < num_items; i ++)
 887                 {
 888                         set_color (fg, bg, NORMAL);
 889                         printf ("\u2551%-*s\u2551", padding, items[i]);
 890                         reset_color (); printf ("\n");
 891                 }
 892                 set_color (fg, bg, NORMAL);
 893                 printf ("\u255A");
 894                 for (int i = 0; i < padding; i ++)
 895                         printf ("\u2550");
 896                 printf ("\u255D");
 897                 reset_color (); printf ("\n");
 898 }
 899
 900 /* reset the player data, loading from the puzzle file */
 901 void reset_player_data (MainPlayerData *app_data, const char *filename)
 902 {
 903         app_data->puzzle = load_puzzle (filename);
 904
 905         app_data->is_loaded = app_data->puzzle.grid_frozen;
 906         app_data->cur_col = -1;
 907         app_data->cur_row = -1;
 908         app_data->solution_revealed = false;
 909         strcpy (app_data->filename, filename);
 910         /* reset the answer keys */
 911         for (int i = 0; i < app_data->puzzle.grid_size; i ++)
 912                 for (int j = 0; j < app_data->puzzle.grid_size; j ++)
 913                         app_data->char_ans[i][j] = ' ';
 914
 915 }
 916
 917 /* in the player app, move the current selection index left or right */
 918 void move_current_col (MainPlayerData *app_data, enum DIRECTION dir)
 919 {
 920         int r = app_data->cur_row;
 921         int c = app_data->cur_col;
 922         if (dir == DIR_FORWARD)
 923         {
 924                 c ++;
 925                 while (c < app_data->puzzle.grid_size)
 926                 {
 927                         if (app_data->puzzle.chars[r][c] == '#')
 928                                 c ++;
 929                         else
 930                                 break;
 931                 }
 932                 if (c < app_data->puzzle.grid_size)
 933                         app_data->cur_col = c;
 934         }
 935         else
 936         {
 937                 c --;
 938                 while (c >= 0)
 939                 {
 940                         if (app_data->puzzle.chars[r][c] == '#')
 941                                 c --;
 942                         else
 943                                 break;
 944                 }
 945                 if (c >= 0)
 946                         app_data->cur_col = c;
 947         }
 948 }
 949
 950 /* in the player app move the current selection index up or down */
 951 void move_current_row (MainPlayerData *app_data, enum DIRECTION dir)
 952 {
 953         int r = app_data->cur_row;
 954         int c = app_data->cur_col;
 955         if (dir == DIR_FORWARD)
 956         {
 957                 r ++;
 958                 while (r < app_data->puzzle.grid_size)
 959                 {
 960                         if (app_data->puzzle.chars[r][c] == '#')
 961                                 r ++;
 962                         else
 963                                 break;
 964                 }
 965                 if (r < app_data->puzzle.grid_size)
 966                         app_data->cur_row = r;
 967         }
 968         else
 969         {
 970                 r --;
 971                 while (r >= 0)
 972                 {
 973                         if (app_data->puzzle.chars[r][c] == '#')
 974                                 r --;
 975                         else
 976                                 break;
 977                 }
 978                 if (r >= 0)
 979                         app_data->cur_row = r;
 980         }
 981 }
 982
 983 #endif