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[btb/d2x.git] / main / mission.c
1 /* $Id: mission.c,v 1.20 2003-02-28 03:54:55 btb 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  * Old Log:
20  * Revision 1.4  1995/10/31  10:21:40  allender
21  * no mission support in shareware
22  *
23  * Revision 1.3  1995/10/21  22:53:04  allender
24  * moved missions to data folder
25  *
26  * Revision 1.2  1995/09/13  08:47:29  allender
27  * made to work with Chris' direct stuff
28  *
29  * Revision 1.1  1995/05/16  15:27:48  allender
30  * Initial revision
31  *
32  * Revision 2.9  1995/05/26  16:16:32  john
33  * Split SATURN into define's for requiring cd, using cd, etc.
34  * Also started adding all the Rockwell stuff.
35  *
36  * Revision 2.8  1995/03/20  15:49:31  mike
37  * Remove eof char from comment which confused make depend, causing
38  * no mission.obj: line in makefile.  Pretty stupid tool, huh?
39  *
40  * Revision 2.7  1995/03/20  12:12:11  john
41  * Added ifdef SATURN.
42  *
43  * Revision 2.6  1995/03/15  14:32:49  john
44  * Added code to force the Descent CD-rom in the drive.
45  *
46  * Revision 2.5  1995/03/15  11:41:15  john
47  * Better Saturn CD-ROM support.
48  *
49  * Revision 2.4  1995/03/14  18:24:14  john
50  * Force Destination Saturn to use CD-ROM drive.
51  *
52  * Revision 2.3  1995/03/07  14:19:41  mike
53  * More destination saturn stuff.
54  *
55  * Revision 2.2  1995/03/06  23:09:03  mike
56  * more saturn stuff: make briefings work for saturn mission.
57  *
58  * Revision 2.1  1995/03/06  16:47:48  mike
59  * destination saturn
60  *
61  * Revision 2.0  1995/02/27  11:27:49  john
62  * New version 2.0, which has no anonymous unions, builds with
63  * Watcom 10.0, and doesn't require parsing BITMAPS.TBL.
64  *
65  * Revision 1.14  1995/02/15  11:30:37  john
66  * Fixed bug with potential mem overwrite on line 160.
67  *
68  * Revision 1.13  1995/02/10  17:53:20  matt
69  * Changed mission name again
70  *
71  * Revision 1.12  1995/02/10  17:35:38  matt
72  * Changed name of built-in mission
73  *
74  * Revision 1.11  1995/02/07  17:13:51  allender
75  * removed return statement in load_mission so that built in mission will
76  * actually set the Current_mission_name and _filename
77  *
78  * Revision 1.10  1995/01/31  01:19:45  matt
79  * Made build_mission_list() sort missions by name
80  *
81  * Revision 1.9  1995/01/30  13:49:58  allender
82  * changed build_mission_list in load_mission_by_name to include
83  * anarchy levels.
84  *
85  * Revision 1.8  1995/01/30  13:03:51  matt
86  * Fixed dumb mistake
87  *
88  * Revision 1.7  1995/01/30  12:55:22  matt
89  * Added vars to point to mission names
90  *
91  * Revision 1.6  1995/01/22  18:57:28  matt
92  * Made player highest level work with missions
93  *
94  * Revision 1.5  1995/01/22  14:13:08  matt
95  * Added flag in mission list for anarchy-only missions
96  *
97  * Revision 1.4  1995/01/21  23:13:12  matt
98  * Made high scores with (not work, really) with loaded missions
99  * Don't give player high score when quit game
100  *
101  * Revision 1.3  1995/01/21  16:27:12  matt
102  * Made endlevel briefing work with missions
103  *
104  * Revision 1.2  1995/01/20  22:47:50  matt
105  * Mission system implemented, though imcompletely
106  *
107  * Revision 1.1  1995/01/20  13:42:19  matt
108  * Initial revision
109  *
110  *
111  */
112
113 #ifdef HAVE_CONFIG_H
114 #include <conf.h>
115 #endif
116
117 #include <stdio.h>
118 #include <stdlib.h>
119 #include <string.h>
120 #include <ctype.h>
121 #include <limits.h>
122
123 #include "pstypes.h"
124 #include "cfile.h"
125
126 #include "strutil.h"
127 #include "inferno.h"
128 #include "mission.h"
129 #include "gameseq.h"
130 #include "titles.h"
131 #include "songs.h"
132 #include "mono.h"
133 #include "error.h"
134 #include "findfile.h"
135
136 mle Mission_list[MAX_MISSIONS];
137
138 int Current_mission_num;
139 int N_secret_levels;    // Made a global by MK for scoring purposes.  August 1, 1995.
140 char *Current_mission_filename,*Current_mission_longname;
141
142 int Builtin_mission_num;
143 char Builtin_mission_filename[9];
144 int Builtin_mission_hogsize;
145
146 int D1_Builtin_mission_num;
147 char D1_Builtin_mission_filename[9];
148 int D1_Builtin_mission_hogsize;
149
150 //this stuff should get defined elsewhere
151
152 char Level_names[MAX_LEVELS_PER_MISSION][FILENAME_LEN];
153 char Secret_level_names[MAX_SECRET_LEVELS_PER_MISSION][FILENAME_LEN];
154
155 //values for d1 built-in mission
156 #define BIM_LAST_LEVEL          27
157 #define BIM_LAST_SECRET_LEVEL   -3
158 #define BIM_BRIEFING_FILE       "briefing.tex"
159 #define BIM_ENDING_FILE         "endreg.tex"
160
161 //
162 //  Special versions of mission routines for d1 builtins
163 //
164
165 int load_mission_d1(int mission_num)
166 {
167         int i;
168
169         cfile_use_descent1_hogfile("descent.hog");
170
171         Current_mission_num = mission_num;
172         Current_mission_filename = Mission_list[mission_num].filename;
173         Current_mission_longname = Mission_list[mission_num].mission_name;
174
175         switch (D1_Builtin_mission_hogsize) {
176         case D1_SHAREWARE_MISSION_HOGSIZE:
177         case D1_SHAREWARE_10_MISSION_HOGSIZE:
178                 N_secret_levels = 0;
179
180                 Last_level = 7;
181                 Last_secret_level = 0;
182
183                 //build level names
184                 for (i=0;i<Last_level;i++)
185                         sprintf(Level_names[i], "level%02d.sdl", i+1);
186
187                 break;
188         case D1_MAC_SHARE_MISSION_HOGSIZE:
189                 N_secret_levels = 0;
190
191                 Last_level = 3;
192                 Last_secret_level = 0;
193
194                 //build level names
195                 for (i=0;i<Last_level;i++)
196                         sprintf(Level_names[i], "level%02d.sdl", i+1);
197
198                 break;
199         case D1_OEM_MISSION_HOGSIZE:
200                 N_secret_levels = 1;
201
202                 Last_level = 15;
203                 Last_secret_level = -1;
204
205                 //build level names
206                 for (i=0; i < Last_level - 1; i++)
207                         sprintf(Level_names[i], "level%02d.rdl", i+1);
208                 sprintf(Level_names[i], "saturn%02d.rdl", i+1);
209                 for (i=0; i < -Last_secret_level; i++)
210                         sprintf(Secret_level_names[i], "levels%1d.rdl", i+1);
211
212                 Secret_level_table[0] = 10;
213
214                 break;
215         default:
216                 Int3(); // fall through
217         case D1_MISSION_HOGSIZE:
218         case D1_10_MISSION_HOGSIZE:
219         case D1_MAC_MISSION_HOGSIZE:
220                 N_secret_levels = 3;
221
222                 Last_level = BIM_LAST_LEVEL;
223                 Last_secret_level = BIM_LAST_SECRET_LEVEL;
224
225                 //build level names
226                 for (i=0;i<Last_level;i++)
227                         sprintf(Level_names[i], "level%02d.rdl", i+1);
228                 for (i=0;i<-Last_secret_level;i++)
229                         sprintf(Secret_level_names[i], "levels%1d.rdl", i+1);
230
231                 Secret_level_table[0] = 10;
232                 Secret_level_table[1] = 21;
233                 Secret_level_table[2] = 24;
234
235                 break;
236         }
237         strcpy(Briefing_text_filename,BIM_BRIEFING_FILE);
238         strcpy(Ending_text_filename,BIM_ENDING_FILE);
239
240         return 1;
241 }
242
243
244 //
245 //  Special versions of mission routines for shareware
246 //
247
248 int load_mission_shareware(int mission_num)
249 {
250         Current_mission_num = mission_num;
251         Current_mission_filename = Mission_list[mission_num].filename;
252         Current_mission_longname = Mission_list[mission_num].mission_name;
253
254         N_secret_levels = 0;
255
256         Last_level = 3;
257         Last_secret_level = 0;
258
259         switch (Builtin_mission_hogsize) {
260         case MAC_SHARE_MISSION_HOGSIZE:
261                 // mac demo is using the regular hog and rl2 files
262                 strcpy(Level_names[0],"d2leva-1.rl2");
263                 strcpy(Level_names[1],"d2leva-2.rl2");
264                 strcpy(Level_names[2],"d2leva-3.rl2");
265                 break;
266         default:
267                 Int3(); // fall through
268         case SHAREWARE_MISSION_HOGSIZE:
269                 strcpy(Level_names[0],"d2leva-1.sl2");
270                 strcpy(Level_names[1],"d2leva-2.sl2");
271                 strcpy(Level_names[2],"d2leva-3.sl2");
272         }
273
274         return 1;
275 }
276
277
278 //
279 //  Special versions of mission routines for Diamond/S3 version
280 //
281
282 int load_mission_oem(int mission_num)
283 {
284         Current_mission_num = mission_num;
285         Current_mission_filename = Mission_list[mission_num].filename;
286         Current_mission_longname = Mission_list[mission_num].mission_name;
287
288         N_secret_levels = 2;
289
290         Last_level = 8;
291         Last_secret_level = -2;
292
293         strcpy(Level_names[0],"d2leva-1.rl2");
294         strcpy(Level_names[1],"d2leva-2.rl2");
295         strcpy(Level_names[2],"d2leva-3.rl2");
296         strcpy(Level_names[3],"d2leva-4.rl2");
297
298         strcpy(Secret_level_names[0],"d2leva-s.rl2");
299
300         strcpy(Level_names[4],"d2levb-1.rl2");
301         strcpy(Level_names[5],"d2levb-2.rl2");
302         strcpy(Level_names[6],"d2levb-3.rl2");
303         strcpy(Level_names[7],"d2levb-4.rl2");
304
305         strcpy(Secret_level_names[1],"d2levb-s.rl2");
306
307         Secret_level_table[0] = 1;
308         Secret_level_table[1] = 5;
309
310         return 1;
311 }
312
313
314 //strips damn newline from end of line
315 char *mfgets(char *s,int n,CFILE *f)
316 {
317         char *r;
318
319         r = cfgets(s,n,f);
320         if (r && s[strlen(s)-1] == '\n')
321                 s[strlen(s)-1] = 0;
322
323         return r;
324 }
325
326 //compare a string for a token. returns true if match
327 int istok(char *buf,char *tok)
328 {
329         return strnicmp(buf,tok,strlen(tok)) == 0;
330
331 }
332
333 //adds a terminating 0 after a string at the first white space
334 void add_term(char *s)
335 {
336         while (*s && !isspace(*s)) s++;
337
338         *s = 0;         //terminate!
339 }
340
341 //returns ptr to string after '=' & white space, or NULL if no '='
342 //adds 0 after parm at first white space
343 char *get_value(char *buf)
344 {
345         char *t;
346
347         t = strchr(buf,'=')+1;
348
349         if (t) {
350                 while (*t && isspace(*t)) t++;
351
352                 if (*t)
353                         return t;
354         }
355
356         return NULL;            //error!
357 }
358
359 //reads a line, returns ptr to value of passed parm.  returns NULL if none
360 char *get_parm_value(char *parm,CFILE *f)
361 {
362         static char buf[80];
363
364         if (!mfgets(buf,80,f))
365                 return NULL;
366
367         if (istok(buf,parm))
368                 return get_value(buf);
369         else
370                 return NULL;
371 }
372
373 int ml_sort_func(mle *e0,mle *e1)
374 {
375         return stricmp(e0->mission_name,e1->mission_name);
376
377 }
378
379 extern char CDROM_dir[];
380
381 //returns 1 if file read ok, else 0
382 int read_mission_file(char *filename,int count,int location)
383 {
384         char filename2[100];
385         CFILE *mfile;
386
387         //printf("reading: %s\n", filename);
388
389         switch (location) {
390                 case ML_MISSIONDIR:
391                         strcpy(filename2,MISSION_DIR);
392                         break;
393
394                 case ML_CDROM:
395                         songs_stop_redbook();           //so we can read from the CD
396                         strcpy(filename2,CDROM_dir);
397                         break;
398
399                 default:
400                         Int3();         //fall through
401
402                 case ML_CURDIR:
403                         strcpy(filename2,"");
404                         break;
405         }
406         strcat(filename2,filename);
407
408         mfile = cfopen(filename2,"rb");
409
410         if (mfile) {
411                 char *p;
412                 char temp[FILENAME_LEN],*t;
413
414                 strcpy(temp,filename);
415                 if ((t = strchr(temp,'.')) == NULL)
416                         return 0;       //missing extension
417                 // look if it's .mn2 or .msn
418                 Mission_list[count].descent_version = (t[3] == '2') ? 2 : 1;
419                 *t = 0;                 //kill extension
420
421                 strncpy( Mission_list[count].filename, temp, 9 );
422                 Mission_list[count].anarchy_only_flag = 0;
423                 Mission_list[count].location = location;
424
425                 p = get_parm_value("name",mfile);
426
427                 if (!p) {               //try enhanced mission
428                         cfseek(mfile,0,SEEK_SET);
429                         p = get_parm_value("xname",mfile);
430                 }
431
432                 if (!p) {       //try super-enhanced mission!
433                         cfseek(mfile,0,SEEK_SET);
434                         p = get_parm_value("zname",mfile);
435                 }
436
437                 if (p) {
438                         char *t;
439                         if ((t=strchr(p,';'))!=NULL)
440                                 *t=0;
441                         t = p + strlen(p)-1;
442                         while (isspace(*t)) t--;
443                         strncpy(Mission_list[count].mission_name,p,MISSION_NAME_LEN);
444                 }
445                 else {
446                         cfclose(mfile);
447                         return 0;
448                 }
449
450                 p = get_parm_value("type",mfile);
451
452                 //get mission type
453                 if (p)
454                         Mission_list[count].anarchy_only_flag = istok(p,"anarchy");
455
456                 cfclose(mfile);
457
458                 return 1;
459         }
460
461         return 0;
462 }
463
464 void add_d1_builtin_mission_to_list(int *count)
465 {
466         if (!cfexist("descent.hog"))
467                 return;
468
469         D1_Builtin_mission_hogsize = cfile_size("descent.hog");
470
471         switch (D1_Builtin_mission_hogsize) {
472         case D1_SHAREWARE_MISSION_HOGSIZE:
473         case D1_SHAREWARE_10_MISSION_HOGSIZE:
474         case D1_MAC_SHARE_MISSION_HOGSIZE:
475                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
476                 strcpy(Mission_list[*count].mission_name, D1_SHAREWARE_MISSION_NAME);
477                 Mission_list[*count].anarchy_only_flag = 0;
478                 break;
479         case D1_OEM_MISSION_HOGSIZE:
480                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
481                 strcpy(Mission_list[*count].mission_name, D1_OEM_MISSION_NAME);
482                 Mission_list[*count].anarchy_only_flag = 0;
483                 break;
484         default:
485                 Warning("Unknown D1 hogsize %d\n", D1_Builtin_mission_hogsize);
486                 Int3();
487                 // fall through
488         case D1_MISSION_HOGSIZE:
489         case D1_10_MISSION_HOGSIZE:
490         case D1_MAC_MISSION_HOGSIZE:
491                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
492                 strcpy(Mission_list[*count].mission_name, D1_MISSION_NAME);
493                 Mission_list[*count].anarchy_only_flag = 0;
494                 break;
495         }
496
497         strcpy(D1_Builtin_mission_filename, Mission_list[*count].filename);
498         Mission_list[*count].descent_version = 1;
499         Mission_list[*count].anarchy_only_flag = 0;
500         ++(*count);
501 }
502
503
504 void add_builtin_mission_to_list(int *count)
505 {
506         Builtin_mission_hogsize = cfile_size("descent2.hog");
507         if (Builtin_mission_hogsize == -1)
508                 Builtin_mission_hogsize = cfile_size("d2demo.hog");
509
510         switch (Builtin_mission_hogsize) {
511         case SHAREWARE_MISSION_HOGSIZE:
512         case MAC_SHARE_MISSION_HOGSIZE:
513                 strcpy(Mission_list[*count].filename,SHAREWARE_MISSION_FILENAME);
514                 strcpy(Mission_list[*count].mission_name,SHAREWARE_MISSION_NAME);
515                 Mission_list[*count].anarchy_only_flag = 0;
516                 break;
517         case OEM_MISSION_HOGSIZE:
518                 strcpy(Mission_list[*count].filename,OEM_MISSION_FILENAME);
519                 strcpy(Mission_list[*count].mission_name,OEM_MISSION_NAME);
520                 Mission_list[*count].anarchy_only_flag = 0;
521                 break;
522         default:
523                 Warning("Unknown hogsize %d, trying %s\n", Builtin_mission_hogsize, FULL_MISSION_FILENAME ".mn2");
524                 Int3(); //fall through
525         case FULL_MISSION_HOGSIZE:
526                 if (!read_mission_file(FULL_MISSION_FILENAME ".mn2", 0, ML_CURDIR))
527                         Error("Could not find required mission file <%s>", FULL_MISSION_FILENAME ".mn2");
528         }
529
530         strcpy(Builtin_mission_filename, Mission_list[*count].filename);
531         Mission_list[*count].descent_version = 2;
532         Mission_list[*count].anarchy_only_flag = 0;
533         ++(*count);
534 }
535
536
537 void add_missions_to_list(char *search_name, int *count, int anarchy_mode)
538 {
539         FILEFINDSTRUCT find;
540         if( !FileFindFirst( search_name, &find ) ) {
541                 do      {
542                         if (read_mission_file( find.name, *count, ML_MISSIONDIR )) {
543
544                                 if (anarchy_mode || !Mission_list[*count].anarchy_only_flag)
545                                         ++(*count);
546                         }
547
548                 } while( !FileFindNext( &find ) && *count < MAX_MISSIONS);
549                 FileFindClose();
550                 if (*count >= MAX_MISSIONS)
551                         mprintf((0, "Warning: more missions than d2x can handle\n"));
552         }
553 }
554
555 /* move <mission_name> to <place> on mission list, increment <place> */
556 void promote (char * mission_name, int * top_place, int num_missions)
557 {
558         int i;
559         char name[FILENAME_LEN], * t;
560         strcpy(name, mission_name);
561         if ((t = strchr(name,'.')) != NULL)
562                 *t = 0; //kill extension
563         //printf("promoting: %s\n", name);
564         for (i = *top_place; i < num_missions; i++)
565                 if (!stricmp(Mission_list[i].filename, name)) {
566                         //swap mission positions
567                         mle temp;
568
569                         temp = Mission_list[*top_place];
570                         Mission_list[*top_place] = Mission_list[i];
571                         Mission_list[i] = temp;
572                         ++(*top_place);
573                         break;
574                 }
575 }
576
577
578
579 //fills in the global list of missions.  Returns the number of missions
580 //in the list.  If anarchy_mode set, don't include non-anarchy levels.
581
582 extern char CDROM_dir[];
583 extern char AltHogDir[];
584 extern char AltHogdir_initialized;
585
586 int build_mission_list(int anarchy_mode)
587 {
588         static int num_missions=-1;
589         int count = 0;
590         int top_place;
591
592         //now search for levels on disk
593
594 //@@Took out this code because after this routine was called once for
595 //@@a list of single-player missions, a subsequent call for a list of
596 //@@anarchy missions would not scan again, and thus would not find the
597 //@@anarchy-only missions.  If we retain the minimum level of install,
598 //@@we may want to put the code back in, having it always scan for all
599 //@@missions, and have the code that uses it sort out the ones it wants.
600 //@@    if (num_missions != -1) {
601 //@@            if (Current_mission_num != 0)
602 //@@                    load_mission(0);                                //set built-in mission as default
603 //@@            return num_missions;
604 //@@    }
605
606         add_builtin_mission_to_list(&count);  //read built-in first
607         add_d1_builtin_mission_to_list(&count);
608         add_missions_to_list(MISSION_DIR "*.mn2", &count, anarchy_mode);
609         add_missions_to_list(MISSION_DIR "*.msn", &count, anarchy_mode);
610
611         if (AltHogdir_initialized) {
612                 char search_name[PATH_MAX + 5];
613                 strcpy(search_name, AltHogDir);
614                 strcat(search_name, "/" MISSION_DIR "*.mn2");
615                 add_missions_to_list(search_name, &count, anarchy_mode);
616                 strcpy(search_name, AltHogDir);
617                 strcat(search_name, "/" MISSION_DIR "*.msn");
618                 add_missions_to_list(search_name, &count, anarchy_mode);
619         }
620
621         // move original missions (in story-chronological order)
622         // to top of mission list
623         top_place = 0;
624         promote("descent", &top_place, count); // original descent 1 mission
625         D1_Builtin_mission_num = top_place - 1;
626         promote(Builtin_mission_filename, &top_place, count); // d2 or d2demo
627         Builtin_mission_num = top_place - 1;
628         promote("d2x", &top_place, count); // vertigo
629
630         if (count > top_place)
631                 qsort(&Mission_list[top_place],
632                       count - top_place,
633                       sizeof(*Mission_list),
634                                 (int (*)( const void *, const void * ))ml_sort_func);
635
636
637         if (count > top_place)
638                 qsort(&Mission_list[top_place],
639                       count - top_place,
640                       sizeof(*Mission_list),
641                       (int (*)( const void *, const void * ))ml_sort_func);
642
643         //load_mission(0);   //set built-in mission as default
644
645         num_missions = count;
646
647         return count;
648 }
649
650 void init_extra_robot_movie(char *filename);
651
652 //values for built-in mission
653
654 //loads the specfied mission from the mission list.
655 //build_mission_list() must have been called.
656 //Returns true if mission loaded ok, else false.
657 int load_mission(int mission_num)
658 {
659         CFILE *mfile;
660         char buf[80], *v;
661         int found_hogfile;
662         int enhanced_mission = 0;
663
664         if (mission_num == D1_Builtin_mission_num) {
665                 cfile_use_descent1_hogfile("descent.hog");
666                 switch (D1_Builtin_mission_hogsize) {
667                 default:
668                         Int3(); // fall through
669                 case D1_MISSION_HOGSIZE:
670                 case D1_10_MISSION_HOGSIZE:
671                 case D1_MAC_MISSION_HOGSIZE:
672                 case D1_OEM_MISSION_HOGSIZE:
673                 case D1_SHAREWARE_MISSION_HOGSIZE:
674                 case D1_SHAREWARE_10_MISSION_HOGSIZE:
675                 case D1_MAC_SHARE_MISSION_HOGSIZE:
676                         return load_mission_d1(mission_num);
677                         break;
678                 }
679         }
680
681         if (mission_num == Builtin_mission_num) {
682                 switch (Builtin_mission_hogsize) {
683                 case SHAREWARE_MISSION_HOGSIZE:
684                 case MAC_SHARE_MISSION_HOGSIZE:
685                         return load_mission_shareware(mission_num);
686                         break;
687                 case OEM_MISSION_HOGSIZE:
688                         return load_mission_oem(mission_num);
689                         break;
690                 default:
691                         Int3(); // fall through
692                 case FULL_MISSION_HOGSIZE:
693                         // continue on... (use d2.mn2 from hogfile)
694                         break;
695                 }
696         }
697
698         Current_mission_num = mission_num;
699
700         mprintf(( 0, "Loading mission %d\n", mission_num ));
701
702         //read mission from file
703
704         switch (Mission_list[mission_num].location) {
705         case ML_MISSIONDIR:
706                 strcpy(buf,MISSION_DIR);
707                 break;
708         case ML_CDROM:
709                 strcpy(buf,CDROM_dir);
710                 break;
711         default:
712                 Int3();                                                 //fall through
713         case ML_CURDIR:
714                 strcpy(buf,"");
715                 break;
716         }
717         strcat(buf,Mission_list[mission_num].filename);
718         if (Mission_list[mission_num].descent_version == 2)
719                 strcat(buf,".mn2");
720         else
721                 strcat(buf,".msn");
722
723         mfile = cfopen(buf,"rb");
724         if (mfile == NULL) {
725                 Current_mission_num = -1;
726                 return 0;               //error!
727         }
728
729         //for non-builtin missions, load HOG
730         if (strcmp(Mission_list[mission_num].filename, Builtin_mission_filename)) {
731
732                 strcpy(buf+strlen(buf)-4,".hog");               //change extension
733
734                 found_hogfile = cfile_use_alternate_hogfile(buf);
735
736                 #ifdef RELEASE                          //for release, require mission to be in hogfile
737                 if (! found_hogfile) {
738                         cfclose(mfile);
739                         Current_mission_num = -1;
740                         return 0;
741                 }
742                 #endif
743
744                 // for Descent 1 missions, load descent.hog
745                 if (Mission_list[mission_num].descent_version == 1 && strcmp(buf, "descent.hog"))
746                         if (!cfile_use_descent1_hogfile("descent.hog"))
747                                 Warning("descent.hog not available, this mission may be missing some files required for briefings\n");
748         }
749
750         //init vars
751         Last_level = 0;
752         Last_secret_level = 0;
753         Briefing_text_filename[0] = 0;
754         Ending_text_filename[0] = 0;
755
756         while (mfgets(buf,80,mfile)) {
757
758                 if (istok(buf,"name"))
759                         continue;                                               //already have name, go to next line
760                 if (istok(buf,"xname")) {
761                         enhanced_mission = 1;
762                         continue;                                               //already have name, go to next line
763                 }
764                 if (istok(buf,"zname")) {
765                         enhanced_mission = 2;
766                         continue;                                               //already have name, go to next line
767                 }
768                 else if (istok(buf,"type"))
769                         continue;                                               //already have name, go to next line
770                 else if (istok(buf,"hog")) {
771                         char    *bufp = buf;
772
773                         while (*(bufp++) != '=')
774                                 ;
775
776                         if (*bufp == ' ')
777                                 while (*(++bufp) == ' ')
778                                         ;
779
780                         cfile_use_alternate_hogfile(bufp);
781                         mprintf((0, "Hog file override = [%s]\n", bufp));
782                 }
783                 else if (istok(buf,"briefing")) {
784                         if ((v = get_value(buf)) != NULL) {
785                                 add_term(v);
786                                 if (strlen(v) < 13)
787                                         strcpy(Briefing_text_filename,v);
788                         }
789                 }
790                 else if (istok(buf,"ending")) {
791                         if ((v = get_value(buf)) != NULL) {
792                                 add_term(v);
793                                 if (strlen(v) < 13)
794                                         strcpy(Ending_text_filename,v);
795                         }
796                 }
797                 else if (istok(buf,"num_levels")) {
798
799                         if ((v=get_value(buf))!=NULL) {
800                                 int n_levels,i;
801
802                                 n_levels = atoi(v);
803
804                                 for (i=0;i<n_levels && mfgets(buf,80,mfile);i++) {
805
806                                         add_term(buf);
807                                         if (strlen(buf) <= 12) {
808                                                 strcpy(Level_names[i],buf);
809                                                 Last_level++;
810                                         }
811                                         else
812                                                 break;
813                                 }
814
815                         }
816                 }
817                 else if (istok(buf,"num_secrets")) {
818                         if ((v=get_value(buf))!=NULL) {
819                                 int i;
820
821                                 N_secret_levels = atoi(v);
822
823                                 Assert(N_secret_levels <= MAX_SECRET_LEVELS_PER_MISSION);
824
825                                 for (i=0;i<N_secret_levels && mfgets(buf,80,mfile);i++) {
826                                         char *t;
827
828                                         
829                                         if ((t=strchr(buf,','))!=NULL) *t++=0;
830                                         else
831                                                 break;
832
833                                         add_term(buf);
834                                         if (strlen(buf) <= 12) {
835                                                 strcpy(Secret_level_names[i],buf);
836                                                 Secret_level_table[i] = atoi(t);
837                                                 if (Secret_level_table[i]<1 || Secret_level_table[i]>Last_level)
838                                                         break;
839                                                 Last_secret_level--;
840                                         }
841                                         else
842                                                 break;
843                                 }
844
845                         }
846                 }
847
848         }
849
850         cfclose(mfile);
851
852         if (Last_level <= 0) {
853                 Current_mission_num = -1;               //no valid mission loaded
854                 return 0;
855         }
856
857         Current_mission_filename = Mission_list[Current_mission_num].filename;
858         Current_mission_longname = Mission_list[Current_mission_num].mission_name;
859
860         if (enhanced_mission) {
861                 char t[50];
862                 extern void bm_read_extra_robots();
863                 sprintf(t,"%s.ham",Current_mission_filename);
864                 bm_read_extra_robots(t,enhanced_mission);
865                 strncpy(t,Current_mission_filename,6);
866                 strcat(t,"-l.mvl");
867                 init_extra_robot_movie(t);
868         }
869
870         return 1;
871 }
872
873 //loads the named mission if exists.
874 //Returns true if mission loaded ok, else false.
875 int load_mission_by_name(char *mission_name)
876 {
877         int n,i;
878
879         n = build_mission_list(1);
880
881         for (i=0;i<n;i++)
882                 if (!stricmp(mission_name,Mission_list[i].filename))
883                         return load_mission(i);
884
885         return 0;               //couldn't find mission
886 }