attempt to support d1 for mac mission
[btb/d2x.git] / main / mission.c
1 /* $Id: mission.c,v 1.18 2003-01-11 02:58:33 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 #include "hoard.h"
136
137 mle Mission_list[MAX_MISSIONS];
138
139 int Current_mission_num;
140 int N_secret_levels;    // Made a global by MK for scoring purposes.  August 1, 1995.
141 char *Current_mission_filename,*Current_mission_longname;
142
143 int Builtin_mission_num;
144 char Builtin_mission_filename[9];
145 int Builtin_mission_hogsize;
146
147 int D1_Builtin_mission_num;
148 char D1_Builtin_mission_filename[9];
149 int D1_Builtin_mission_hogsize;
150
151 //this stuff should get defined elsewhere
152
153 char Level_names[MAX_LEVELS_PER_MISSION][FILENAME_LEN];
154 char Secret_level_names[MAX_SECRET_LEVELS_PER_MISSION][FILENAME_LEN];
155
156 //where the missions go
157 #ifndef EDITOR
158 #define MISSION_DIR "missions/"
159 #else
160 #define MISSION_DIR "./"
161 #endif
162
163 //values for d1 built-in mission
164 #define BIM_LAST_LEVEL          27
165 #define BIM_LAST_SECRET_LEVEL   -3
166 #define BIM_BRIEFING_FILE       "briefing.tex"
167 #define BIM_ENDING_FILE         "endreg.tex"
168
169 //
170 //  Special versions of mission routines for d1 builtins
171 //
172
173 int load_mission_d1(int mission_num)
174 {
175         int i;
176
177         cfile_use_descent1_hogfile("descent.hog");
178
179         Current_mission_num = mission_num;
180         Current_mission_filename = Mission_list[mission_num].filename;
181         Current_mission_longname = Mission_list[mission_num].mission_name;
182
183         switch (D1_Builtin_mission_hogsize) {
184         case D1_SHAREWARE_MISSION_HOGSIZE:
185                 N_secret_levels = 0;
186
187                 Last_level = 7;
188                 Last_secret_level = 0;
189
190                 //build level names
191                 for (i=0;i<Last_level;i++)
192                         sprintf(Level_names[i], "level%02d.sdl", i+1);
193
194                 break;
195         case D1_MAC_SHARE_MISSION_HOGSIZE:
196                 N_secret_levels = 0;
197
198                 Last_level = 3;
199                 Last_secret_level = 0;
200
201                 //build level names
202                 for (i=0;i<Last_level;i++)
203                         sprintf(Level_names[i], "level%02d.sdl", i+1);
204
205                 break;
206         default:
207                 Int3(); // fall through
208         case D1_MISSION_HOGSIZE:
209         case D1_MAC_MISSION_HOGSIZE:
210                 N_secret_levels = 3;
211
212                 Last_level = BIM_LAST_LEVEL;
213                 Last_secret_level = BIM_LAST_SECRET_LEVEL;
214
215                 //build level names
216                 for (i=0;i<Last_level;i++)
217                         sprintf(Level_names[i], "level%02d.rdl", i+1);
218                 for (i=0;i<-Last_secret_level;i++)
219                         sprintf(Secret_level_names[i], "levels%1d.rdl", i+1);
220
221                 Secret_level_table[0] = 10;
222                 Secret_level_table[1] = 21;
223                 Secret_level_table[2] = 24;
224
225                 break;
226         }
227         strcpy(Briefing_text_filename,BIM_BRIEFING_FILE);
228         strcpy(Ending_text_filename,BIM_ENDING_FILE);
229
230         return 1;
231 }
232
233
234 //
235 //  Special versions of mission routines for shareware
236 //
237
238 int load_mission_shareware(int mission_num)
239 {
240         Current_mission_num = mission_num;
241         Current_mission_filename = Mission_list[mission_num].filename;
242         Current_mission_longname = Mission_list[mission_num].mission_name;
243
244         N_secret_levels = 0;
245
246         Last_level = 3;
247         Last_secret_level = 0;
248
249         switch (Builtin_mission_hogsize) {
250         case MAC_SHARE_MISSION_HOGSIZE:
251                 // mac demo is using the regular hog and rl2 files
252                 strcpy(Level_names[0],"d2leva-1.rl2");
253                 strcpy(Level_names[1],"d2leva-2.rl2");
254                 strcpy(Level_names[2],"d2leva-3.rl2");
255                 break;
256         default:
257                 Int3(); // fall through
258         case SHAREWARE_MISSION_HOGSIZE:
259                 strcpy(Level_names[0],"d2leva-1.sl2");
260                 strcpy(Level_names[1],"d2leva-2.sl2");
261                 strcpy(Level_names[2],"d2leva-3.sl2");
262         }
263
264         return 1;
265 }
266
267
268 //
269 //  Special versions of mission routines for Diamond/S3 version
270 //
271
272 int load_mission_oem(int mission_num)
273 {
274         Current_mission_num = mission_num;
275         Current_mission_filename = Mission_list[mission_num].filename;
276         Current_mission_longname = Mission_list[mission_num].mission_name;
277
278         N_secret_levels = 2;
279
280         Last_level = 8;
281         Last_secret_level = -2;
282
283         strcpy(Level_names[0],"d2leva-1.rl2");
284         strcpy(Level_names[1],"d2leva-2.rl2");
285         strcpy(Level_names[2],"d2leva-3.rl2");
286         strcpy(Level_names[3],"d2leva-4.rl2");
287
288         strcpy(Secret_level_names[0],"d2leva-s.rl2");
289
290         strcpy(Level_names[4],"d2levb-1.rl2");
291         strcpy(Level_names[5],"d2levb-2.rl2");
292         strcpy(Level_names[6],"d2levb-3.rl2");
293         strcpy(Level_names[7],"d2levb-4.rl2");
294
295         strcpy(Secret_level_names[1],"d2levb-s.rl2");
296
297         Secret_level_table[0] = 1;
298         Secret_level_table[1] = 5;
299
300         return 1;
301 }
302
303
304 //strips damn newline from end of line
305 char *mfgets(char *s,int n,CFILE *f)
306 {
307         char *r;
308
309         r = cfgets(s,n,f);
310         if (r && s[strlen(s)-1] == '\n')
311                 s[strlen(s)-1] = 0;
312
313         return r;
314 }
315
316 //compare a string for a token. returns true if match
317 int istok(char *buf,char *tok)
318 {
319         return strnicmp(buf,tok,strlen(tok)) == 0;
320
321 }
322
323 //adds a terminating 0 after a string at the first white space
324 void add_term(char *s)
325 {
326         while (*s && !isspace(*s)) s++;
327
328         *s = 0;         //terminate!
329 }
330
331 //returns ptr to string after '=' & white space, or NULL if no '='
332 //adds 0 after parm at first white space
333 char *get_value(char *buf)
334 {
335         char *t;
336
337         t = strchr(buf,'=')+1;
338
339         if (t) {
340                 while (*t && isspace(*t)) t++;
341
342                 if (*t)
343                         return t;
344         }
345
346         return NULL;            //error!
347 }
348
349 //reads a line, returns ptr to value of passed parm.  returns NULL if none
350 char *get_parm_value(char *parm,CFILE *f)
351 {
352         static char buf[80];
353
354         if (!mfgets(buf,80,f))
355                 return NULL;
356
357         if (istok(buf,parm))
358                 return get_value(buf);
359         else
360                 return NULL;
361 }
362
363 int ml_sort_func(mle *e0,mle *e1)
364 {
365         return stricmp(e0->mission_name,e1->mission_name);
366
367 }
368
369 extern char CDROM_dir[];
370
371 //returns 1 if file read ok, else 0
372 int read_mission_file(char *filename,int count,int location)
373 {
374         char filename2[100];
375         CFILE *mfile;
376
377         //printf("reading: %s\n", filename);
378
379         switch (location) {
380                 case ML_MISSIONDIR:
381                         strcpy(filename2,MISSION_DIR);
382                         break;
383
384                 case ML_CDROM:
385                         songs_stop_redbook();           //so we can read from the CD
386                         strcpy(filename2,CDROM_dir);
387                         break;
388
389                 default:
390                         Int3();         //fall through
391
392                 case ML_CURDIR:
393                         strcpy(filename2,"");
394                         break;
395         }
396         strcat(filename2,filename);
397
398         mfile = cfopen(filename2,"rb");
399
400         if (mfile) {
401                 char *p;
402                 char temp[FILENAME_LEN],*t;
403
404                 strcpy(temp,filename);
405                 if ((t = strchr(temp,'.')) == NULL)
406                         return 0;       //missing extension
407                 // look if it's .mn2 or .msn
408                 Mission_list[count].descent_version = (t[3] == '2') ? 2 : 1;
409                 *t = 0;                 //kill extension
410
411                 strncpy( Mission_list[count].filename, temp, 9 );
412                 Mission_list[count].anarchy_only_flag = 0;
413                 Mission_list[count].location = location;
414
415                 p = get_parm_value("name",mfile);
416
417                 if (!p) {               //try enhanced mission
418                         cfseek(mfile,0,SEEK_SET);
419                         p = get_parm_value("xname",mfile);
420                 }
421
422                 if (HoardEquipped())
423                 {
424                         if (!p) {               //try super-enhanced mission!
425                                 cfseek(mfile,0,SEEK_SET);
426                                 p = get_parm_value("zname",mfile);
427                         }
428                 }
429
430                 if (p) {
431                         char *t;
432                         if ((t=strchr(p,';'))!=NULL)
433                                 *t=0;
434                         t = p + strlen(p)-1;
435                         while (isspace(*t)) t--;
436                         strncpy(Mission_list[count].mission_name,p,MISSION_NAME_LEN);
437                 }
438                 else {
439                         cfclose(mfile);
440                         return 0;
441                 }
442
443                 p = get_parm_value("type",mfile);
444
445                 //get mission type
446                 if (p)
447                         Mission_list[count].anarchy_only_flag = istok(p,"anarchy");
448
449                 cfclose(mfile);
450
451                 return 1;
452         }
453
454         return 0;
455 }
456
457 void add_d1_builtin_mission_to_list(int *count)
458 {
459         if (!cfexist("descent.hog"))
460                 return;
461
462         D1_Builtin_mission_hogsize = cfile_size("descent.hog");
463
464         switch (D1_Builtin_mission_hogsize) {
465         case D1_SHAREWARE_MISSION_HOGSIZE:
466         case D1_MAC_SHARE_MISSION_HOGSIZE:
467                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
468                 strcpy(Mission_list[*count].mission_name, D1_SHAREWARE_MISSION_NAME);
469                 Mission_list[*count].anarchy_only_flag = 0;
470                 break;
471         default:
472                 Warning("Unknown D1 hogsize %d\n", D1_Builtin_mission_hogsize);
473                 Int3();
474                 // fall through
475         case D1_MISSION_HOGSIZE:
476         case D1_MAC_MISSION_HOGSIZE:
477                 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
478                 strcpy(Mission_list[*count].mission_name, D1_MISSION_NAME);
479                 Mission_list[*count].anarchy_only_flag = 0;
480                 break;
481         }
482
483         strcpy(D1_Builtin_mission_filename, Mission_list[*count].filename);
484         Mission_list[*count].descent_version = 1;
485         Mission_list[*count].anarchy_only_flag = 0;
486         ++(*count);
487 }
488
489
490 void add_builtin_mission_to_list(int *count)
491 {
492         Builtin_mission_hogsize = cfile_size("descent2.hog");
493         if (Builtin_mission_hogsize == -1)
494                 Builtin_mission_hogsize = cfile_size("d2demo.hog");
495
496         switch (Builtin_mission_hogsize) {
497         case SHAREWARE_MISSION_HOGSIZE:
498         case MAC_SHARE_MISSION_HOGSIZE:
499                 strcpy(Mission_list[*count].filename,SHAREWARE_MISSION_FILENAME);
500                 strcpy(Mission_list[*count].mission_name,SHAREWARE_MISSION_NAME);
501                 Mission_list[*count].anarchy_only_flag = 0;
502                 break;
503         case OEM_MISSION_HOGSIZE:
504                 strcpy(Mission_list[*count].filename,OEM_MISSION_FILENAME);
505                 strcpy(Mission_list[*count].mission_name,OEM_MISSION_NAME);
506                 Mission_list[*count].anarchy_only_flag = 0;
507                 break;
508         default:
509                 Warning("Unknown hogsize %d, trying %s\n", Builtin_mission_hogsize, FULL_MISSION_FILENAME ".mn2");
510                 Int3(); //fall through
511         case FULL_MISSION_HOGSIZE:
512                 if (!read_mission_file(FULL_MISSION_FILENAME ".mn2", 0, ML_CURDIR))
513                         Error("Could not find required mission file <%s>", FULL_MISSION_FILENAME ".mn2");
514         }
515
516         strcpy(Builtin_mission_filename, Mission_list[*count].filename);
517         Mission_list[*count].descent_version = 2;
518         Mission_list[*count].anarchy_only_flag = 0;
519         ++(*count);
520 }
521
522
523 void add_missions_to_list(char *search_name, int *count, int anarchy_mode)
524 {
525         FILEFINDSTRUCT find;
526         if( !FileFindFirst( search_name, &find ) ) {
527                 do      {
528                         if (read_mission_file( find.name, *count, ML_MISSIONDIR )) {
529
530                                 if (anarchy_mode || !Mission_list[*count].anarchy_only_flag)
531                                         ++(*count);
532                         }
533
534                 } while( !FileFindNext( &find ) && *count < MAX_MISSIONS);
535                 FileFindClose();
536                 if (*count >= MAX_MISSIONS)
537                         mprintf((0, "Warning: more missions than d2x can handle\n"));
538         }
539 }
540
541 /* move <mission_name> to <place> on mission list, increment <place> */
542 void promote (char * mission_name, int * top_place, int num_missions)
543 {
544         int i;
545         char name[FILENAME_LEN], * t;
546         strcpy(name, mission_name);
547         if ((t = strchr(name,'.')) != NULL)
548                 *t = 0; //kill extension
549         //printf("promoting: %s\n", name);
550         for (i = *top_place; i < num_missions; i++)
551                 if (!stricmp(Mission_list[i].filename, name)) {
552                         //swap mission positions
553                         mle temp;
554
555                         temp = Mission_list[*top_place];
556                         Mission_list[*top_place] = Mission_list[i];
557                         Mission_list[i] = temp;
558                         ++(*top_place);
559                         break;
560                 }
561 }
562
563
564
565 //fills in the global list of missions.  Returns the number of missions
566 //in the list.  If anarchy_mode set, don't include non-anarchy levels.
567
568 extern char CDROM_dir[];
569 extern char AltHogDir[];
570 extern char AltHogdir_initialized;
571
572 int build_mission_list(int anarchy_mode)
573 {
574         static int num_missions=-1;
575         int count = 0;
576         int top_place;
577
578         //now search for levels on disk
579
580 //@@Took out this code because after this routine was called once for
581 //@@a list of single-player missions, a subsequent call for a list of
582 //@@anarchy missions would not scan again, and thus would not find the
583 //@@anarchy-only missions.  If we retain the minimum level of install,
584 //@@we may want to put the code back in, having it always scan for all
585 //@@missions, and have the code that uses it sort out the ones it wants.
586 //@@    if (num_missions != -1) {
587 //@@            if (Current_mission_num != 0)
588 //@@                    load_mission(0);                                //set built-in mission as default
589 //@@            return num_missions;
590 //@@    }
591
592         add_builtin_mission_to_list(&count);  //read built-in first
593         add_d1_builtin_mission_to_list(&count);
594         add_missions_to_list(MISSION_DIR "*.mn2", &count, anarchy_mode);
595         add_missions_to_list(MISSION_DIR "*.msn", &count, anarchy_mode);
596
597         if (AltHogdir_initialized) {
598                 char search_name[PATH_MAX + 5];
599                 strcpy(search_name, AltHogDir);
600                 strcat(search_name, "/" MISSION_DIR "*.mn2");
601                 add_missions_to_list(search_name, &count, anarchy_mode);
602                 strcpy(search_name, AltHogDir);
603                 strcat(search_name, "/" MISSION_DIR "*.msn");
604                 add_missions_to_list(search_name, &count, anarchy_mode);
605         }
606
607         // move original missions (in story-chronological order)
608         // to top of mission list
609         top_place = 0;
610         promote("descent", &top_place, count); // original descent 1 mission
611         D1_Builtin_mission_num = top_place - 1;
612         promote(Builtin_mission_filename, &top_place, count); // d2 or d2demo
613         Builtin_mission_num = top_place - 1;
614         promote("d2x", &top_place, count); // vertigo
615
616         if (count > top_place)
617                 qsort(&Mission_list[top_place],
618                       count - top_place,
619                       sizeof(*Mission_list),
620                                 (int (*)( const void *, const void * ))ml_sort_func);
621
622
623         if (count > top_place)
624                 qsort(&Mission_list[top_place],
625                       count - top_place,
626                       sizeof(*Mission_list),
627                       (int (*)( const void *, const void * ))ml_sort_func);
628
629         //load_mission(0);   //set built-in mission as default
630
631         num_missions = count;
632
633         return count;
634 }
635
636 void init_extra_robot_movie(char *filename);
637
638 //values for built-in mission
639
640 //loads the specfied mission from the mission list.
641 //build_mission_list() must have been called.
642 //Returns true if mission loaded ok, else false.
643 int load_mission(int mission_num)
644 {
645         CFILE *mfile;
646         char buf[80], *v;
647         int found_hogfile;
648         int enhanced_mission = 0;
649
650         if (mission_num == D1_Builtin_mission_num) {
651                 cfile_use_descent1_hogfile("descent.hog");
652                 switch (D1_Builtin_mission_hogsize) {
653                 default:
654                         Int3(); // fall through
655                 case D1_MISSION_HOGSIZE:
656                 case D1_MAC_MISSION_HOGSIZE:
657                 case D1_SHAREWARE_MISSION_HOGSIZE:
658                 case D1_MAC_SHARE_MISSION_HOGSIZE:
659                         return load_mission_d1(mission_num);
660                         break;
661                 }
662         }
663
664         if (mission_num == Builtin_mission_num) {
665                 switch (Builtin_mission_hogsize) {
666                 case SHAREWARE_MISSION_HOGSIZE:
667                 case MAC_SHARE_MISSION_HOGSIZE:
668                         return load_mission_shareware(mission_num);
669                         break;
670                 case OEM_MISSION_HOGSIZE:
671                         return load_mission_oem(mission_num);
672                         break;
673                 default:
674                         Int3(); // fall through
675                 case FULL_MISSION_HOGSIZE:
676                         // continue on... (use d2.mn2 from hogfile)
677                         break;
678                 }
679         }
680
681         Current_mission_num = mission_num;
682
683         mprintf(( 0, "Loading mission %d\n", mission_num ));
684
685         //read mission from file
686
687         switch (Mission_list[mission_num].location) {
688         case ML_MISSIONDIR:
689                 strcpy(buf,MISSION_DIR);
690                 break;
691         case ML_CDROM:
692                 strcpy(buf,CDROM_dir);
693                 break;
694         default:
695                 Int3();                                                 //fall through
696         case ML_CURDIR:
697                 strcpy(buf,"");
698                 break;
699         }
700         strcat(buf,Mission_list[mission_num].filename);
701         if (Mission_list[mission_num].descent_version == 2)
702                 strcat(buf,".mn2");
703         else
704                 strcat(buf,".msn");
705
706         mfile = cfopen(buf,"rb");
707         if (mfile == NULL) {
708                 Current_mission_num = -1;
709                 return 0;               //error!
710         }
711
712         //for non-builtin missions, load HOG
713         if (strcmp(Mission_list[mission_num].filename, Builtin_mission_filename)) {
714
715                 strcpy(buf+strlen(buf)-4,".hog");               //change extension
716
717                 found_hogfile = cfile_use_alternate_hogfile(buf);
718
719                 #ifdef RELEASE                          //for release, require mission to be in hogfile
720                 if (! found_hogfile) {
721                         cfclose(mfile);
722                         Current_mission_num = -1;
723                         return 0;
724                 }
725                 #endif
726
727                 // for Descent 1 missions, load descent.hog
728                 if (Mission_list[mission_num].descent_version == 1 && strcmp(buf, "descent.hog"))
729                         if (!cfile_use_descent1_hogfile("descent.hog"))
730                                 Warning("descent.hog not available, this mission may be missing some files required for briefings\n");
731         }
732
733         //init vars
734         Last_level = 0;
735         Last_secret_level = 0;
736         Briefing_text_filename[0] = 0;
737         Ending_text_filename[0] = 0;
738
739         while (mfgets(buf,80,mfile)) {
740
741                 if (istok(buf,"name"))
742                         continue;                                               //already have name, go to next line
743                 if (istok(buf,"xname")) {
744                         enhanced_mission = 1;
745                         continue;                                               //already have name, go to next line
746                 }
747                 if (istok(buf,"zname")) {
748                         enhanced_mission = 2;
749                         continue;                                               //already have name, go to next line
750                 }
751                 else if (istok(buf,"type"))
752                         continue;                                               //already have name, go to next line
753                 else if (istok(buf,"hog")) {
754                         char    *bufp = buf;
755
756                         while (*(bufp++) != '=')
757                                 ;
758
759                         if (*bufp == ' ')
760                                 while (*(++bufp) == ' ')
761                                         ;
762
763                         cfile_use_alternate_hogfile(bufp);
764                         mprintf((0, "Hog file override = [%s]\n", bufp));
765                 }
766                 else if (istok(buf,"briefing")) {
767                         if ((v = get_value(buf)) != NULL) {
768                                 add_term(v);
769                                 if (strlen(v) < 13)
770                                         strcpy(Briefing_text_filename,v);
771                         }
772                 }
773                 else if (istok(buf,"ending")) {
774                         if ((v = get_value(buf)) != NULL) {
775                                 add_term(v);
776                                 if (strlen(v) < 13)
777                                         strcpy(Ending_text_filename,v);
778                         }
779                 }
780                 else if (istok(buf,"num_levels")) {
781
782                         if ((v=get_value(buf))!=NULL) {
783                                 int n_levels,i;
784
785                                 n_levels = atoi(v);
786
787                                 for (i=0;i<n_levels && mfgets(buf,80,mfile);i++) {
788
789                                         add_term(buf);
790                                         if (strlen(buf) <= 12) {
791                                                 strcpy(Level_names[i],buf);
792                                                 Last_level++;
793                                         }
794                                         else
795                                                 break;
796                                 }
797
798                         }
799                 }
800                 else if (istok(buf,"num_secrets")) {
801                         if ((v=get_value(buf))!=NULL) {
802                                 int i;
803
804                                 N_secret_levels = atoi(v);
805
806                                 Assert(N_secret_levels <= MAX_SECRET_LEVELS_PER_MISSION);
807
808                                 for (i=0;i<N_secret_levels && mfgets(buf,80,mfile);i++) {
809                                         char *t;
810
811                                         
812                                         if ((t=strchr(buf,','))!=NULL) *t++=0;
813                                         else
814                                                 break;
815
816                                         add_term(buf);
817                                         if (strlen(buf) <= 12) {
818                                                 strcpy(Secret_level_names[i],buf);
819                                                 Secret_level_table[i] = atoi(t);
820                                                 if (Secret_level_table[i]<1 || Secret_level_table[i]>Last_level)
821                                                         break;
822                                                 Last_secret_level--;
823                                         }
824                                         else
825                                                 break;
826                                 }
827
828                         }
829                 }
830
831         }
832
833         cfclose(mfile);
834
835         if (Last_level <= 0) {
836                 Current_mission_num = -1;               //no valid mission loaded
837                 return 0;
838         }
839
840         Current_mission_filename = Mission_list[Current_mission_num].filename;
841         Current_mission_longname = Mission_list[Current_mission_num].mission_name;
842
843         if (enhanced_mission) {
844                 char t[50];
845                 extern void bm_read_extra_robots();
846                 sprintf(t,"%s.ham",Current_mission_filename);
847                 bm_read_extra_robots(t,enhanced_mission);
848                 strncpy(t,Current_mission_filename,6);
849                 strcat(t,"-l.mvl");
850                 init_extra_robot_movie(t);
851         }
852
853         return 1;
854 }
855
856 //loads the named mission if exists.
857 //Returns true if mission loaded ok, else false.
858 int load_mission_by_name(char *mission_name)
859 {
860         int n,i;
861
862         n = build_mission_list(1);
863
864         for (i=0;i<n;i++)
865                 if (!stricmp(mission_name,Mission_list[i].filename))
866                         return load_mission(i);
867
868         return 0;               //couldn't find mission
869 }