main/mission.c

   1 /* $Id: mission.c,v 1.25 2004-08-28 23:17:45 schaffner Exp $ */
   2 /*
   3 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   4 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   5 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   6 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   7 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   8 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   9 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
  10 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  11 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  12 COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  13 */
  14
  15 /*
  16  *
  17  * Code to handle multiple missions
  18  *
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <conf.h>
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <ctype.h>
  29 #include <limits.h>
  30
  31 #include "pstypes.h"
  32 #include "cfile.h"
  33
  34 #include "strutil.h"
  35 #include "inferno.h"
  36 #include "mission.h"
  37 #include "gameseq.h"
  38 #include "titles.h"
  39 #include "songs.h"
  40 #include "mono.h"
  41 #include "error.h"
  42 #include "findfile.h"
  43
  44 mle Mission_list[MAX_MISSIONS];
  45
  46 int Current_mission_num;
  47 int N_secret_levels;    // Made a global by MK for scoring purposes.  August 1, 1995.
  48 char *Current_mission_filename,*Current_mission_longname;
  49
  50 int Builtin_mission_num;
  51 char Builtin_mission_filename[9];
  52 int Builtin_mission_hogsize;
  53
  54 int D1_Builtin_mission_num;
  55 char D1_Builtin_mission_filename[9];
  56 int D1_Builtin_mission_hogsize;
  57
  58 //this stuff should get defined elsewhere
  59
  60 char Level_names[MAX_LEVELS_PER_MISSION][FILENAME_LEN];
  61 char Secret_level_names[MAX_SECRET_LEVELS_PER_MISSION][FILENAME_LEN];
  62
  63 //values for d1 built-in mission
  64 #define BIM_LAST_LEVEL          27
  65 #define BIM_LAST_SECRET_LEVEL   -3
  66 #define BIM_BRIEFING_FILE       "briefing.tex"
  67 #define BIM_ENDING_FILE         "endreg.tex"
  68
  69 //
  70 //  Special versions of mission routines for d1 builtins
  71 //
  72
  73 int load_mission_d1(int mission_num)
  74 {
  75         int i;
  76
  77         cfile_use_descent1_hogfile("descent.hog");
  78
  79         Current_mission_num = mission_num;
  80         Current_mission_filename = Mission_list[mission_num].filename;
  81         Current_mission_longname = Mission_list[mission_num].mission_name;
  82
  83         switch (D1_Builtin_mission_hogsize) {
  84         case D1_SHAREWARE_MISSION_HOGSIZE:
  85         case D1_SHAREWARE_10_MISSION_HOGSIZE:
  86                 N_secret_levels = 0;
  87
  88                 Last_level = 7;
  89                 Last_secret_level = 0;
  90
  91                 //build level names
  92                 for (i=0;i<Last_level;i++)
  93                         sprintf(Level_names[i], "level%02d.sdl", i+1);
  94
  95                 break;
  96         case D1_MAC_SHARE_MISSION_HOGSIZE:
  97                 N_secret_levels = 0;
  98
  99                 Last_level = 3;
 100                 Last_secret_level = 0;
 101
 102                 //build level names
 103                 for (i=0;i<Last_level;i++)
 104                         sprintf(Level_names[i], "level%02d.sdl", i+1);
 105
 106                 break;
 107         case D1_OEM_MISSION_HOGSIZE:
 108         case D1_OEM_10_MISSION_HOGSIZE:
 109                 N_secret_levels = 1;
 110
 111                 Last_level = 15;
 112                 Last_secret_level = -1;
 113
 114                 //build level names
 115                 for (i=0; i < Last_level - 1; i++)
 116                         sprintf(Level_names[i], "level%02d.rdl", i+1);
 117                 sprintf(Level_names[i], "saturn%02d.rdl", i+1);
 118                 for (i=0; i < -Last_secret_level; i++)
 119                         sprintf(Secret_level_names[i], "levels%1d.rdl", i+1);
 120
 121                 Secret_level_table[0] = 10;
 122
 123                 break;
 124         default:
 125                 Int3(); // fall through
 126         case D1_MISSION_HOGSIZE:
 127         case D1_10_MISSION_HOGSIZE:
 128         case D1_MAC_MISSION_HOGSIZE:
 129                 N_secret_levels = 3;
 130
 131                 Last_level = BIM_LAST_LEVEL;
 132                 Last_secret_level = BIM_LAST_SECRET_LEVEL;
 133
 134                 //build level names
 135                 for (i=0;i<Last_level;i++)
 136                         sprintf(Level_names[i], "level%02d.rdl", i+1);
 137                 for (i=0;i<-Last_secret_level;i++)
 138                         sprintf(Secret_level_names[i], "levels%1d.rdl", i+1);
 139
 140                 Secret_level_table[0] = 10;
 141                 Secret_level_table[1] = 21;
 142                 Secret_level_table[2] = 24;
 143
 144                 break;
 145         }
 146         strcpy(Briefing_text_filename,BIM_BRIEFING_FILE);
 147         strcpy(Ending_text_filename,BIM_ENDING_FILE);
 148
 149         return 1;
 150 }
 151
 152
 153 //
 154 //  Special versions of mission routines for shareware
 155 //
 156
 157 int load_mission_shareware(int mission_num)
 158 {
 159         Current_mission_num = mission_num;
 160         Current_mission_filename = Mission_list[mission_num].filename;
 161         Current_mission_longname = Mission_list[mission_num].mission_name;
 162
 163         switch (Builtin_mission_hogsize) {
 164         case MAC_SHARE_MISSION_HOGSIZE:
 165                 N_secret_levels = 1;
 166
 167                 Last_level = 4;
 168                 Last_secret_level = -1;
 169
 170                 // mac demo is using the regular hog and rl2 files
 171                 strcpy(Level_names[0],"d2leva-1.rl2");
 172                 strcpy(Level_names[1],"d2leva-2.rl2");
 173                 strcpy(Level_names[2],"d2leva-3.rl2");
 174                 strcpy(Level_names[3],"d2leva-4.rl2");
 175                 strcpy(Secret_level_names[0],"d2leva-s.rl2");
 176                 break;
 177         default:
 178                 Int3(); // fall through
 179         case SHAREWARE_MISSION_HOGSIZE:
 180                 N_secret_levels = 0;
 181
 182                 Last_level = 3;
 183                 Last_secret_level = 0;
 184
 185                 strcpy(Level_names[0],"d2leva-1.sl2");
 186                 strcpy(Level_names[1],"d2leva-2.sl2");
 187                 strcpy(Level_names[2],"d2leva-3.sl2");
 188         }
 189
 190         return 1;
 191 }
 192
 193
 194 //
 195 //  Special versions of mission routines for Diamond/S3 version
 196 //
 197
 198 int load_mission_oem(int mission_num)
 199 {
 200         Current_mission_num = mission_num;
 201         Current_mission_filename = Mission_list[mission_num].filename;
 202         Current_mission_longname = Mission_list[mission_num].mission_name;
 203
 204         N_secret_levels = 2;
 205
 206         Last_level = 8;
 207         Last_secret_level = -2;
 208
 209         strcpy(Level_names[0],"d2leva-1.rl2");
 210         strcpy(Level_names[1],"d2leva-2.rl2");
 211         strcpy(Level_names[2],"d2leva-3.rl2");
 212         strcpy(Level_names[3],"d2leva-4.rl2");
 213
 214         strcpy(Secret_level_names[0],"d2leva-s.rl2");
 215
 216         strcpy(Level_names[4],"d2levb-1.rl2");
 217         strcpy(Level_names[5],"d2levb-2.rl2");
 218         strcpy(Level_names[6],"d2levb-3.rl2");
 219         strcpy(Level_names[7],"d2levb-4.rl2");
 220
 221         strcpy(Secret_level_names[1],"d2levb-s.rl2");
 222
 223         Secret_level_table[0] = 1;
 224         Secret_level_table[1] = 5;
 225
 226         return 1;
 227 }
 228
 229
 230 //strips damn newline from end of line
 231 char *mfgets(char *s,int n,CFILE *f)
 232 {
 233         char *r;
 234
 235         r = cfgets(s,n,f);
 236         if (r && s[strlen(s)-1] == '\n')
 237                 s[strlen(s)-1] = 0;
 238
 239         return r;
 240 }
 241
 242 //compare a string for a token. returns true if match
 243 int istok(char *buf,char *tok)
 244 {
 245         return strnicmp(buf,tok,strlen(tok)) == 0;
 246
 247 }
 248
 249 //adds a terminating 0 after a string at the first white space
 250 void add_term(char *s)
 251 {
 252         while (*s && !isspace(*s)) s++;
 253
 254         *s = 0;         //terminate!
 255 }
 256
 257 //returns ptr to string after '=' & white space, or NULL if no '='
 258 //adds 0 after parm at first white space
 259 char *get_value(char *buf)
 260 {
 261         char *t;
 262
 263         t = strchr(buf,'=')+1;
 264
 265         if (t) {
 266                 while (*t && isspace(*t)) t++;
 267
 268                 if (*t)
 269                         return t;
 270         }
 271
 272         return NULL;            //error!
 273 }
 274
 275 //reads a line, returns ptr to value of passed parm.  returns NULL if none
 276 char *get_parm_value(char *parm,CFILE *f)
 277 {
 278         static char buf[80];
 279
 280         if (!mfgets(buf,80,f))
 281                 return NULL;
 282
 283         if (istok(buf,parm))
 284                 return get_value(buf);
 285         else
 286                 return NULL;
 287 }
 288
 289 int ml_sort_func(mle *e0,mle *e1)
 290 {
 291         return stricmp(e0->mission_name,e1->mission_name);
 292
 293 }
 294
 295 extern char CDROM_dir[];
 296
 297 //returns 1 if file read ok, else 0
 298 int read_mission_file(char *filename,int count,int location)
 299 {
 300         char filename2[100];
 301         CFILE *mfile;
 302
 303         //printf("reading: %s\n", filename);
 304
 305         switch (location) {
 306                 case ML_MISSIONDIR:
 307                         strcpy(filename2,MISSION_DIR);
 308                         break;
 309
 310                 case ML_CDROM:
 311                         songs_stop_redbook();           //so we can read from the CD
 312                         strcpy(filename2,CDROM_dir);
 313                         break;
 314
 315                 default:
 316                         Int3();         //fall through
 317
 318                 case ML_CURDIR:
 319                         strcpy(filename2,"");
 320                         break;
 321         }
 322         strcat(filename2,filename);
 323
 324         mfile = cfopen(filename2,"rb");
 325
 326         if (mfile) {
 327                 char *p;
 328                 char temp[FILENAME_LEN],*t;
 329
 330                 strcpy(temp,filename);
 331                 if ((t = strchr(temp,'.')) == NULL)
 332                         return 0;       //missing extension
 333                 // look if it's .mn2 or .msn
 334                 Mission_list[count].descent_version = (t[3] == '2') ? 2 : 1;
 335                 *t = 0;                 //kill extension
 336
 337                 strncpy( Mission_list[count].filename, temp, 9 );
 338                 Mission_list[count].anarchy_only_flag = 0;
 339                 Mission_list[count].location = location;
 340
 341                 p = get_parm_value("name",mfile);
 342
 343                 if (!p) {               //try enhanced mission
 344                         cfseek(mfile,0,SEEK_SET);
 345                         p = get_parm_value("xname",mfile);
 346                 }
 347
 348                 if (!p) {       //try super-enhanced mission!
 349                         cfseek(mfile,0,SEEK_SET);
 350                         p = get_parm_value("zname",mfile);
 351                 }
 352
 353                 if (p) {
 354                         char *t;
 355                         if ((t=strchr(p,';'))!=NULL)
 356                                 *t=0;
 357                         t = p + strlen(p)-1;
 358                         while (isspace(*t)) t--;
 359                         strncpy(Mission_list[count].mission_name,p,MISSION_NAME_LEN);
 360                 }
 361                 else {
 362                         cfclose(mfile);
 363                         return 0;
 364                 }
 365
 366                 p = get_parm_value("type",mfile);
 367
 368                 //get mission type
 369                 if (p)
 370                         Mission_list[count].anarchy_only_flag = istok(p,"anarchy");
 371
 372                 cfclose(mfile);
 373
 374                 return 1;
 375         }
 376
 377         return 0;
 378 }
 379
 380 void add_d1_builtin_mission_to_list(int *count)
 381 {
 382         if (!cfexist("descent.hog"))
 383                 return;
 384
 385         D1_Builtin_mission_hogsize = cfile_size("descent.hog");
 386
 387         switch (D1_Builtin_mission_hogsize) {
 388         case D1_SHAREWARE_MISSION_HOGSIZE:
 389         case D1_SHAREWARE_10_MISSION_HOGSIZE:
 390         case D1_MAC_SHARE_MISSION_HOGSIZE:
 391                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
 392                 strcpy(Mission_list[*count].mission_name, D1_SHAREWARE_MISSION_NAME);
 393                 Mission_list[*count].anarchy_only_flag = 0;
 394                 break;
 395         case D1_OEM_MISSION_HOGSIZE:
 396         case D1_OEM_10_MISSION_HOGSIZE:
 397                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
 398                 strcpy(Mission_list[*count].mission_name, D1_OEM_MISSION_NAME);
 399                 Mission_list[*count].anarchy_only_flag = 0;
 400                 break;
 401         default:
 402                 Warning("Unknown D1 hogsize %d\n", D1_Builtin_mission_hogsize);
 403                 Int3();
 404                 // fall through
 405         case D1_MISSION_HOGSIZE:
 406         case D1_10_MISSION_HOGSIZE:
 407         case D1_MAC_MISSION_HOGSIZE:
 408                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
 409                 strcpy(Mission_list[*count].mission_name, D1_MISSION_NAME);
 410                 Mission_list[*count].anarchy_only_flag = 0;
 411                 break;
 412         }
 413
 414         strcpy(D1_Builtin_mission_filename, Mission_list[*count].filename);
 415         Mission_list[*count].descent_version = 1;
 416         Mission_list[*count].anarchy_only_flag = 0;
 417         ++(*count);
 418 }
 419
 420
 421 void add_builtin_mission_to_list(int *count)
 422 {
 423         Builtin_mission_hogsize = cfile_size("descent2.hog");
 424         if (Builtin_mission_hogsize == -1)
 425                 Builtin_mission_hogsize = cfile_size("d2demo.hog");
 426
 427         switch (Builtin_mission_hogsize) {
 428         case SHAREWARE_MISSION_HOGSIZE:
 429         case MAC_SHARE_MISSION_HOGSIZE:
 430                 strcpy(Mission_list[*count].filename,SHAREWARE_MISSION_FILENAME);
 431                 strcpy(Mission_list[*count].mission_name,SHAREWARE_MISSION_NAME);
 432                 Mission_list[*count].anarchy_only_flag = 0;
 433                 break;
 434         case OEM_MISSION_HOGSIZE:
 435                 strcpy(Mission_list[*count].filename,OEM_MISSION_FILENAME);
 436                 strcpy(Mission_list[*count].mission_name,OEM_MISSION_NAME);
 437                 Mission_list[*count].anarchy_only_flag = 0;
 438                 break;
 439         default:
 440                 Warning("Unknown hogsize %d, trying %s\n", Builtin_mission_hogsize, FULL_MISSION_FILENAME ".mn2");
 441                 Int3(); //fall through
 442         case FULL_MISSION_HOGSIZE:
 443         case FULL_10_MISSION_HOGSIZE:
 444         case MAC_FULL_MISSION_HOGSIZE:
 445                 if (!read_mission_file(FULL_MISSION_FILENAME ".mn2", 0, ML_CURDIR))
 446                         Error("Could not find required mission file <%s>", FULL_MISSION_FILENAME ".mn2");
 447         }
 448
 449         strcpy(Builtin_mission_filename, Mission_list[*count].filename);
 450         Mission_list[*count].descent_version = 2;
 451         Mission_list[*count].anarchy_only_flag = 0;
 452         ++(*count);
 453 }
 454
 455
 456 void add_missions_to_list(char *search_name, int *count, int anarchy_mode)
 457 {
 458         FILEFINDSTRUCT find;
 459         if( !FileFindFirst( search_name, &find ) ) {
 460                 do      {
 461                         if (read_mission_file( find.name, *count, ML_MISSIONDIR )) {
 462
 463                                 if (anarchy_mode || !Mission_list[*count].anarchy_only_flag)
 464                                         ++(*count);
 465                         }
 466
 467                 } while( !FileFindNext( &find ) && *count < MAX_MISSIONS);
 468                 FileFindClose();
 469                 if (*count >= MAX_MISSIONS)
 470                         mprintf((0, "Warning: more missions than d2x can handle\n"));
 471         }
 472 }
 473
 474 /* move <mission_name> to <place> on mission list, increment <place> */
 475 void promote (char * mission_name, int * top_place, int num_missions)
 476 {
 477         int i;
 478         char name[FILENAME_LEN], * t;
 479         strcpy(name, mission_name);
 480         if ((t = strchr(name,'.')) != NULL)
 481                 *t = 0; //kill extension
 482         //printf("promoting: %s\n", name);
 483         for (i = *top_place; i < num_missions; i++)
 484                 if (!stricmp(Mission_list[i].filename, name)) {
 485                         //swap mission positions
 486                         mle temp;
 487
 488                         temp = Mission_list[*top_place];
 489                         Mission_list[*top_place] = Mission_list[i];
 490                         Mission_list[i] = temp;
 491                         ++(*top_place);
 492                         break;
 493                 }
 494 }
 495
 496
 497
 498 //fills in the global list of missions.  Returns the number of missions
 499 //in the list.  If anarchy_mode set, don't include non-anarchy levels.
 500
 501 extern char CDROM_dir[];
 502 extern char AltHogDir[];
 503 extern char AltHogdir_initialized;
 504
 505 int build_mission_list(int anarchy_mode)
 506 {
 507         static int num_missions=-1;
 508         int count = 0;
 509         int top_place;
 510
 511         //now search for levels on disk
 512
 513 //@@Took out this code because after this routine was called once for
 514 //@@a list of single-player missions, a subsequent call for a list of
 515 //@@anarchy missions would not scan again, and thus would not find the
 516 //@@anarchy-only missions.  If we retain the minimum level of install,
 517 //@@we may want to put the code back in, having it always scan for all
 518 //@@missions, and have the code that uses it sort out the ones it wants.
 519 //@@    if (num_missions != -1) {
 520 //@@            if (Current_mission_num != 0)
 521 //@@                    load_mission(0);                                //set built-in mission as default
 522 //@@            return num_missions;
 523 //@@    }
 524
 525         add_builtin_mission_to_list(&count);  //read built-in first
 526         add_d1_builtin_mission_to_list(&count);
 527         add_missions_to_list(MISSION_DIR "*.mn2", &count, anarchy_mode);
 528         add_missions_to_list(MISSION_DIR "*.msn", &count, anarchy_mode);
 529
 530         if (AltHogdir_initialized) {
 531                 char search_name[PATH_MAX + 5];
 532                 strcpy(search_name, AltHogDir);
 533                 strcat(search_name, "/" MISSION_DIR "*.mn2");
 534                 add_missions_to_list(search_name, &count, anarchy_mode);
 535                 strcpy(search_name, AltHogDir);
 536                 strcat(search_name, "/" MISSION_DIR "*.msn");
 537                 add_missions_to_list(search_name, &count, anarchy_mode);
 538         }
 539
 540         // move original missions (in story-chronological order)
 541         // to top of mission list
 542         top_place = 0;
 543         promote("descent", &top_place, count); // original descent 1 mission
 544         D1_Builtin_mission_num = top_place - 1;
 545         promote(Builtin_mission_filename, &top_place, count); // d2 or d2demo
 546         Builtin_mission_num = top_place - 1;
 547         promote("d2x", &top_place, count); // vertigo
 548
 549         if (count > top_place)
 550                 qsort(&Mission_list[top_place],
 551                       count - top_place,
 552                       sizeof(*Mission_list),
 553                                 (int (*)( const void *, const void * ))ml_sort_func);
 554
 555
 556         if (count > top_place)
 557                 qsort(&Mission_list[top_place],
 558                       count - top_place,
 559                       sizeof(*Mission_list),
 560                       (int (*)( const void *, const void * ))ml_sort_func);
 561
 562         //load_mission(0);   //set built-in mission as default
 563
 564         num_missions = count;
 565
 566         return count;
 567 }
 568
 569 void init_extra_robot_movie(char *filename);
 570
 571 //values for built-in mission
 572
 573 //loads the specfied mission from the mission list.
 574 //build_mission_list() must have been called.
 575 //Returns true if mission loaded ok, else false.
 576 int load_mission(int mission_num)
 577 {
 578         CFILE *mfile;
 579         char buf[80], *v;
 580         int found_hogfile;
 581         int enhanced_mission = 0;
 582
 583         if (mission_num == D1_Builtin_mission_num) {
 584                 cfile_use_descent1_hogfile("descent.hog");
 585                 switch (D1_Builtin_mission_hogsize) {
 586                 default:
 587                         Int3(); // fall through
 588                 case D1_MISSION_HOGSIZE:
 589                 case D1_10_MISSION_HOGSIZE:
 590                 case D1_MAC_MISSION_HOGSIZE:
 591                 case D1_OEM_MISSION_HOGSIZE:
 592                 case D1_OEM_10_MISSION_HOGSIZE:
 593                 case D1_SHAREWARE_MISSION_HOGSIZE:
 594                 case D1_SHAREWARE_10_MISSION_HOGSIZE:
 595                 case D1_MAC_SHARE_MISSION_HOGSIZE:
 596                         return load_mission_d1(mission_num);
 597                         break;
 598                 }
 599         }
 600
 601         if (mission_num == Builtin_mission_num) {
 602                 switch (Builtin_mission_hogsize) {
 603                 case SHAREWARE_MISSION_HOGSIZE:
 604                 case MAC_SHARE_MISSION_HOGSIZE:
 605                         return load_mission_shareware(mission_num);
 606                         break;
 607                 case OEM_MISSION_HOGSIZE:
 608                         return load_mission_oem(mission_num);
 609                         break;
 610                 default:
 611                         Int3(); // fall through
 612                 case FULL_MISSION_HOGSIZE:
 613                 case FULL_10_MISSION_HOGSIZE:
 614                 case MAC_FULL_MISSION_HOGSIZE:
 615                         // continue on... (use d2.mn2 from hogfile)
 616                         break;
 617                 }
 618         }
 619
 620         Current_mission_num = mission_num;
 621
 622         mprintf(( 0, "Loading mission %d\n", mission_num ));
 623
 624         //read mission from file
 625
 626         switch (Mission_list[mission_num].location) {
 627         case ML_MISSIONDIR:
 628                 strcpy(buf,MISSION_DIR);
 629                 break;
 630         case ML_CDROM:
 631                 strcpy(buf,CDROM_dir);
 632                 break;
 633         default:
 634                 Int3();                                                 //fall through
 635         case ML_CURDIR:
 636                 strcpy(buf,"");
 637                 break;
 638         }
 639         strcat(buf,Mission_list[mission_num].filename);
 640         if (Mission_list[mission_num].descent_version == 2)
 641                 strcat(buf,".mn2");
 642         else
 643                 strcat(buf,".msn");
 644
 645         mfile = cfopen(buf,"rb");
 646         if (mfile == NULL) {
 647                 Current_mission_num = -1;
 648                 return 0;               //error!
 649         }
 650
 651         //for non-builtin missions, load HOG
 652         if (strcmp(Mission_list[mission_num].filename, Builtin_mission_filename)) {
 653
 654                 strcpy(buf+strlen(buf)-4,".hog");               //change extension
 655
 656                 found_hogfile = cfile_use_alternate_hogfile(buf);
 657
 658                 #ifdef RELEASE                          //for release, require mission to be in hogfile
 659                 if (! found_hogfile) {
 660                         cfclose(mfile);
 661                         Current_mission_num = -1;
 662                         return 0;
 663                 }
 664                 #endif
 665
 666                 // for Descent 1 missions, load descent.hog
 667                 if (Mission_list[mission_num].descent_version == 1 && strcmp(buf, "descent.hog"))
 668                         if (!cfile_use_descent1_hogfile("descent.hog"))
 669                                 Warning("descent.hog not available, this mission may be missing some files required for briefings and exit sequence\n");
 670         }
 671
 672         //init vars
 673         Last_level = 0;
 674         Last_secret_level = 0;
 675         Briefing_text_filename[0] = 0;
 676         Ending_text_filename[0] = 0;
 677
 678         while (mfgets(buf,80,mfile)) {
 679
 680                 if (istok(buf,"name"))
 681                         continue;                                               //already have name, go to next line
 682                 if (istok(buf,"xname")) {
 683                         enhanced_mission = 1;
 684                         continue;                                               //already have name, go to next line
 685                 }
 686                 if (istok(buf,"zname")) {
 687                         enhanced_mission = 2;
 688                         continue;                                               //already have name, go to next line
 689                 }
 690                 else if (istok(buf,"type"))
 691                         continue;                                               //already have name, go to next line
 692                 else if (istok(buf,"hog")) {
 693                         char    *bufp = buf;
 694
 695                         while (*(bufp++) != '=')
 696                                 ;
 697
 698                         if (*bufp == ' ')
 699                                 while (*(++bufp) == ' ')
 700                                         ;
 701
 702                         cfile_use_alternate_hogfile(bufp);
 703                         mprintf((0, "Hog file override = [%s]\n", bufp));
 704                 }
 705                 else if (istok(buf,"briefing")) {
 706                         if ((v = get_value(buf)) != NULL) {
 707                                 add_term(v);
 708                                 if (strlen(v) < 13)
 709                                         strcpy(Briefing_text_filename,v);
 710                         }
 711                 }
 712                 else if (istok(buf,"ending")) {
 713                         if ((v = get_value(buf)) != NULL) {
 714                                 add_term(v);
 715                                 if (strlen(v) < 13)
 716                                         strcpy(Ending_text_filename,v);
 717                         }
 718                 }
 719                 else if (istok(buf,"num_levels")) {
 720
 721                         if ((v=get_value(buf))!=NULL) {
 722                                 int n_levels,i;
 723
 724                                 n_levels = atoi(v);
 725
 726                                 for (i=0;i<n_levels && mfgets(buf,80,mfile);i++) {
 727
 728                                         add_term(buf);
 729                                         if (strlen(buf) <= 12) {
 730                                                 strcpy(Level_names[i],buf);
 731                                                 Last_level++;
 732                                         }
 733                                         else
 734                                                 break;
 735                                 }
 736
 737                         }
 738                 }
 739                 else if (istok(buf,"num_secrets")) {
 740                         if ((v=get_value(buf))!=NULL) {
 741                                 int i;
 742
 743                                 N_secret_levels = atoi(v);
 744
 745                                 Assert(N_secret_levels <= MAX_SECRET_LEVELS_PER_MISSION);
 746
 747                                 for (i=0;i<N_secret_levels && mfgets(buf,80,mfile);i++) {
 748                                         char *t;
 749
 750
 751                                         if ((t=strchr(buf,','))!=NULL) *t++=0;
 752                                         else
 753                                                 break;
 754
 755                                         add_term(buf);
 756                                         if (strlen(buf) <= 12) {
 757                                                 strcpy(Secret_level_names[i],buf);
 758                                                 Secret_level_table[i] = atoi(t);
 759                                                 if (Secret_level_table[i]<1 || Secret_level_table[i]>Last_level)
 760                                                         break;
 761                                                 Last_secret_level--;
 762                                         }
 763                                         else
 764                                                 break;
 765                                 }
 766
 767                         }
 768                 }
 769
 770         }
 771
 772         cfclose(mfile);
 773
 774         if (Last_level <= 0) {
 775                 Current_mission_num = -1;               //no valid mission loaded
 776                 return 0;
 777         }
 778
 779         Current_mission_filename = Mission_list[Current_mission_num].filename;
 780         Current_mission_longname = Mission_list[Current_mission_num].mission_name;
 781
 782         if (enhanced_mission) {
 783                 char t[50];
 784                 extern void bm_read_extra_robots();
 785                 sprintf(t,"%s.ham",Current_mission_filename);
 786                 bm_read_extra_robots(t,enhanced_mission);
 787                 strncpy(t,Current_mission_filename,6);
 788                 strcat(t,"-l.mvl");
 789                 init_extra_robot_movie(t);
 790         }
 791
 792         return 1;
 793 }
 794
 795 //loads the named mission if exists.
 796 //Returns true if mission loaded ok, else false.
 797 int load_mission_by_name(char *mission_name)
 798 {
 799         int n,i;
 800
 801         n = build_mission_list(1);
 802
 803         for (i=0;i<n;i++)
 804                 if (!stricmp(mission_name,Mission_list[i].filename))
 805                         return load_mission(i);
 806
 807         return 0;               //couldn't find mission
 808 }