1 /* $Id: mission.c,v 1.24 2003-11-04 08:03:08 btb Exp $ */
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.
17 * Code to handle multiple missions
20 * Revision 1.4 1995/10/31 10:21:40 allender
21 * no mission support in shareware
23 * Revision 1.3 1995/10/21 22:53:04 allender
24 * moved missions to data folder
26 * Revision 1.2 1995/09/13 08:47:29 allender
27 * made to work with Chris' direct stuff
29 * Revision 1.1 1995/05/16 15:27:48 allender
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.
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?
40 * Revision 2.7 1995/03/20 12:12:11 john
43 * Revision 2.6 1995/03/15 14:32:49 john
44 * Added code to force the Descent CD-rom in the drive.
46 * Revision 2.5 1995/03/15 11:41:15 john
47 * Better Saturn CD-ROM support.
49 * Revision 2.4 1995/03/14 18:24:14 john
50 * Force Destination Saturn to use CD-ROM drive.
52 * Revision 2.3 1995/03/07 14:19:41 mike
53 * More destination saturn stuff.
55 * Revision 2.2 1995/03/06 23:09:03 mike
56 * more saturn stuff: make briefings work for saturn mission.
58 * Revision 2.1 1995/03/06 16:47:48 mike
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.
65 * Revision 1.14 1995/02/15 11:30:37 john
66 * Fixed bug with potential mem overwrite on line 160.
68 * Revision 1.13 1995/02/10 17:53:20 matt
69 * Changed mission name again
71 * Revision 1.12 1995/02/10 17:35:38 matt
72 * Changed name of built-in mission
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
78 * Revision 1.10 1995/01/31 01:19:45 matt
79 * Made build_mission_list() sort missions by name
81 * Revision 1.9 1995/01/30 13:49:58 allender
82 * changed build_mission_list in load_mission_by_name to include
85 * Revision 1.8 1995/01/30 13:03:51 matt
88 * Revision 1.7 1995/01/30 12:55:22 matt
89 * Added vars to point to mission names
91 * Revision 1.6 1995/01/22 18:57:28 matt
92 * Made player highest level work with missions
94 * Revision 1.5 1995/01/22 14:13:08 matt
95 * Added flag in mission list for anarchy-only missions
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
101 * Revision 1.3 1995/01/21 16:27:12 matt
102 * Made endlevel briefing work with missions
104 * Revision 1.2 1995/01/20 22:47:50 matt
105 * Mission system implemented, though imcompletely
107 * Revision 1.1 1995/01/20 13:42:19 matt
134 #include "findfile.h"
136 mle Mission_list[MAX_MISSIONS];
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;
142 int Builtin_mission_num;
143 char Builtin_mission_filename[9];
144 int Builtin_mission_hogsize;
146 int D1_Builtin_mission_num;
147 char D1_Builtin_mission_filename[9];
148 int D1_Builtin_mission_hogsize;
150 //this stuff should get defined elsewhere
152 char Level_names[MAX_LEVELS_PER_MISSION][FILENAME_LEN];
153 char Secret_level_names[MAX_SECRET_LEVELS_PER_MISSION][FILENAME_LEN];
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"
162 // Special versions of mission routines for d1 builtins
165 int load_mission_d1(int mission_num)
169 cfile_use_descent1_hogfile("descent.hog");
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;
175 switch (D1_Builtin_mission_hogsize) {
176 case D1_SHAREWARE_MISSION_HOGSIZE:
177 case D1_SHAREWARE_10_MISSION_HOGSIZE:
181 Last_secret_level = 0;
184 for (i=0;i<Last_level;i++)
185 sprintf(Level_names[i], "level%02d.sdl", i+1);
188 case D1_MAC_SHARE_MISSION_HOGSIZE:
192 Last_secret_level = 0;
195 for (i=0;i<Last_level;i++)
196 sprintf(Level_names[i], "level%02d.sdl", i+1);
199 case D1_OEM_MISSION_HOGSIZE:
200 case D1_OEM_10_MISSION_HOGSIZE:
204 Last_secret_level = -1;
207 for (i=0; i < Last_level - 1; i++)
208 sprintf(Level_names[i], "level%02d.rdl", i+1);
209 sprintf(Level_names[i], "saturn%02d.rdl", i+1);
210 for (i=0; i < -Last_secret_level; i++)
211 sprintf(Secret_level_names[i], "levels%1d.rdl", i+1);
213 Secret_level_table[0] = 10;
217 Int3(); // fall through
218 case D1_MISSION_HOGSIZE:
219 case D1_10_MISSION_HOGSIZE:
220 case D1_MAC_MISSION_HOGSIZE:
223 Last_level = BIM_LAST_LEVEL;
224 Last_secret_level = BIM_LAST_SECRET_LEVEL;
227 for (i=0;i<Last_level;i++)
228 sprintf(Level_names[i], "level%02d.rdl", i+1);
229 for (i=0;i<-Last_secret_level;i++)
230 sprintf(Secret_level_names[i], "levels%1d.rdl", i+1);
232 Secret_level_table[0] = 10;
233 Secret_level_table[1] = 21;
234 Secret_level_table[2] = 24;
238 strcpy(Briefing_text_filename,BIM_BRIEFING_FILE);
239 strcpy(Ending_text_filename,BIM_ENDING_FILE);
246 // Special versions of mission routines for shareware
249 int load_mission_shareware(int mission_num)
251 Current_mission_num = mission_num;
252 Current_mission_filename = Mission_list[mission_num].filename;
253 Current_mission_longname = Mission_list[mission_num].mission_name;
255 switch (Builtin_mission_hogsize) {
256 case MAC_SHARE_MISSION_HOGSIZE:
260 Last_secret_level = -1;
262 // mac demo is using the regular hog and rl2 files
263 strcpy(Level_names[0],"d2leva-1.rl2");
264 strcpy(Level_names[1],"d2leva-2.rl2");
265 strcpy(Level_names[2],"d2leva-3.rl2");
266 strcpy(Level_names[3],"d2leva-4.rl2");
267 strcpy(Secret_level_names[0],"d2leva-s.rl2");
270 Int3(); // fall through
271 case SHAREWARE_MISSION_HOGSIZE:
275 Last_secret_level = 0;
277 strcpy(Level_names[0],"d2leva-1.sl2");
278 strcpy(Level_names[1],"d2leva-2.sl2");
279 strcpy(Level_names[2],"d2leva-3.sl2");
287 // Special versions of mission routines for Diamond/S3 version
290 int load_mission_oem(int mission_num)
292 Current_mission_num = mission_num;
293 Current_mission_filename = Mission_list[mission_num].filename;
294 Current_mission_longname = Mission_list[mission_num].mission_name;
299 Last_secret_level = -2;
301 strcpy(Level_names[0],"d2leva-1.rl2");
302 strcpy(Level_names[1],"d2leva-2.rl2");
303 strcpy(Level_names[2],"d2leva-3.rl2");
304 strcpy(Level_names[3],"d2leva-4.rl2");
306 strcpy(Secret_level_names[0],"d2leva-s.rl2");
308 strcpy(Level_names[4],"d2levb-1.rl2");
309 strcpy(Level_names[5],"d2levb-2.rl2");
310 strcpy(Level_names[6],"d2levb-3.rl2");
311 strcpy(Level_names[7],"d2levb-4.rl2");
313 strcpy(Secret_level_names[1],"d2levb-s.rl2");
315 Secret_level_table[0] = 1;
316 Secret_level_table[1] = 5;
322 //strips damn newline from end of line
323 char *mfgets(char *s,int n,CFILE *f)
328 if (r && s[strlen(s)-1] == '\n')
334 //compare a string for a token. returns true if match
335 int istok(char *buf,char *tok)
337 return strnicmp(buf,tok,strlen(tok)) == 0;
341 //adds a terminating 0 after a string at the first white space
342 void add_term(char *s)
344 while (*s && !isspace(*s)) s++;
349 //returns ptr to string after '=' & white space, or NULL if no '='
350 //adds 0 after parm at first white space
351 char *get_value(char *buf)
355 t = strchr(buf,'=')+1;
358 while (*t && isspace(*t)) t++;
364 return NULL; //error!
367 //reads a line, returns ptr to value of passed parm. returns NULL if none
368 char *get_parm_value(char *parm,CFILE *f)
372 if (!mfgets(buf,80,f))
376 return get_value(buf);
381 int ml_sort_func(mle *e0,mle *e1)
383 return stricmp(e0->mission_name,e1->mission_name);
387 extern char CDROM_dir[];
389 //returns 1 if file read ok, else 0
390 int read_mission_file(char *filename,int count,int location)
395 //printf("reading: %s\n", filename);
399 strcpy(filename2,MISSION_DIR);
403 songs_stop_redbook(); //so we can read from the CD
404 strcpy(filename2,CDROM_dir);
408 Int3(); //fall through
411 strcpy(filename2,"");
414 strcat(filename2,filename);
416 mfile = cfopen(filename2,"rb");
420 char temp[FILENAME_LEN],*t;
422 strcpy(temp,filename);
423 if ((t = strchr(temp,'.')) == NULL)
424 return 0; //missing extension
425 // look if it's .mn2 or .msn
426 Mission_list[count].descent_version = (t[3] == '2') ? 2 : 1;
427 *t = 0; //kill extension
429 strncpy( Mission_list[count].filename, temp, 9 );
430 Mission_list[count].anarchy_only_flag = 0;
431 Mission_list[count].location = location;
433 p = get_parm_value("name",mfile);
435 if (!p) { //try enhanced mission
436 cfseek(mfile,0,SEEK_SET);
437 p = get_parm_value("xname",mfile);
440 if (!p) { //try super-enhanced mission!
441 cfseek(mfile,0,SEEK_SET);
442 p = get_parm_value("zname",mfile);
447 if ((t=strchr(p,';'))!=NULL)
450 while (isspace(*t)) t--;
451 strncpy(Mission_list[count].mission_name,p,MISSION_NAME_LEN);
458 p = get_parm_value("type",mfile);
462 Mission_list[count].anarchy_only_flag = istok(p,"anarchy");
472 void add_d1_builtin_mission_to_list(int *count)
474 if (!cfexist("descent.hog"))
477 D1_Builtin_mission_hogsize = cfile_size("descent.hog");
479 switch (D1_Builtin_mission_hogsize) {
480 case D1_SHAREWARE_MISSION_HOGSIZE:
481 case D1_SHAREWARE_10_MISSION_HOGSIZE:
482 case D1_MAC_SHARE_MISSION_HOGSIZE:
483 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
484 strcpy(Mission_list[*count].mission_name, D1_SHAREWARE_MISSION_NAME);
485 Mission_list[*count].anarchy_only_flag = 0;
487 case D1_OEM_MISSION_HOGSIZE:
488 case D1_OEM_10_MISSION_HOGSIZE:
489 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
490 strcpy(Mission_list[*count].mission_name, D1_OEM_MISSION_NAME);
491 Mission_list[*count].anarchy_only_flag = 0;
494 Warning("Unknown D1 hogsize %d\n", D1_Builtin_mission_hogsize);
497 case D1_MISSION_HOGSIZE:
498 case D1_10_MISSION_HOGSIZE:
499 case D1_MAC_MISSION_HOGSIZE:
500 strcpy(Mission_list[*count].filename, D1_MISSION_FILENAME);
501 strcpy(Mission_list[*count].mission_name, D1_MISSION_NAME);
502 Mission_list[*count].anarchy_only_flag = 0;
506 strcpy(D1_Builtin_mission_filename, Mission_list[*count].filename);
507 Mission_list[*count].descent_version = 1;
508 Mission_list[*count].anarchy_only_flag = 0;
513 void add_builtin_mission_to_list(int *count)
515 Builtin_mission_hogsize = cfile_size("descent2.hog");
516 if (Builtin_mission_hogsize == -1)
517 Builtin_mission_hogsize = cfile_size("d2demo.hog");
519 switch (Builtin_mission_hogsize) {
520 case SHAREWARE_MISSION_HOGSIZE:
521 case MAC_SHARE_MISSION_HOGSIZE:
522 strcpy(Mission_list[*count].filename,SHAREWARE_MISSION_FILENAME);
523 strcpy(Mission_list[*count].mission_name,SHAREWARE_MISSION_NAME);
524 Mission_list[*count].anarchy_only_flag = 0;
526 case OEM_MISSION_HOGSIZE:
527 strcpy(Mission_list[*count].filename,OEM_MISSION_FILENAME);
528 strcpy(Mission_list[*count].mission_name,OEM_MISSION_NAME);
529 Mission_list[*count].anarchy_only_flag = 0;
532 Warning("Unknown hogsize %d, trying %s\n", Builtin_mission_hogsize, FULL_MISSION_FILENAME ".mn2");
533 Int3(); //fall through
534 case FULL_MISSION_HOGSIZE:
535 case FULL_10_MISSION_HOGSIZE:
536 case MAC_FULL_MISSION_HOGSIZE:
537 if (!read_mission_file(FULL_MISSION_FILENAME ".mn2", 0, ML_CURDIR))
538 Error("Could not find required mission file <%s>", FULL_MISSION_FILENAME ".mn2");
541 strcpy(Builtin_mission_filename, Mission_list[*count].filename);
542 Mission_list[*count].descent_version = 2;
543 Mission_list[*count].anarchy_only_flag = 0;
548 void add_missions_to_list(char *search_name, int *count, int anarchy_mode)
551 if( !FileFindFirst( search_name, &find ) ) {
553 if (read_mission_file( find.name, *count, ML_MISSIONDIR )) {
555 if (anarchy_mode || !Mission_list[*count].anarchy_only_flag)
559 } while( !FileFindNext( &find ) && *count < MAX_MISSIONS);
561 if (*count >= MAX_MISSIONS)
562 mprintf((0, "Warning: more missions than d2x can handle\n"));
566 /* move <mission_name> to <place> on mission list, increment <place> */
567 void promote (char * mission_name, int * top_place, int num_missions)
570 char name[FILENAME_LEN], * t;
571 strcpy(name, mission_name);
572 if ((t = strchr(name,'.')) != NULL)
573 *t = 0; //kill extension
574 //printf("promoting: %s\n", name);
575 for (i = *top_place; i < num_missions; i++)
576 if (!stricmp(Mission_list[i].filename, name)) {
577 //swap mission positions
580 temp = Mission_list[*top_place];
581 Mission_list[*top_place] = Mission_list[i];
582 Mission_list[i] = temp;
590 //fills in the global list of missions. Returns the number of missions
591 //in the list. If anarchy_mode set, don't include non-anarchy levels.
593 extern char CDROM_dir[];
594 extern char AltHogDir[];
595 extern char AltHogdir_initialized;
597 int build_mission_list(int anarchy_mode)
599 static int num_missions=-1;
603 //now search for levels on disk
605 //@@Took out this code because after this routine was called once for
606 //@@a list of single-player missions, a subsequent call for a list of
607 //@@anarchy missions would not scan again, and thus would not find the
608 //@@anarchy-only missions. If we retain the minimum level of install,
609 //@@we may want to put the code back in, having it always scan for all
610 //@@missions, and have the code that uses it sort out the ones it wants.
611 //@@ if (num_missions != -1) {
612 //@@ if (Current_mission_num != 0)
613 //@@ load_mission(0); //set built-in mission as default
614 //@@ return num_missions;
617 add_builtin_mission_to_list(&count); //read built-in first
618 add_d1_builtin_mission_to_list(&count);
619 add_missions_to_list(MISSION_DIR "*.mn2", &count, anarchy_mode);
620 add_missions_to_list(MISSION_DIR "*.msn", &count, anarchy_mode);
622 if (AltHogdir_initialized) {
623 char search_name[PATH_MAX + 5];
624 strcpy(search_name, AltHogDir);
625 strcat(search_name, "/" MISSION_DIR "*.mn2");
626 add_missions_to_list(search_name, &count, anarchy_mode);
627 strcpy(search_name, AltHogDir);
628 strcat(search_name, "/" MISSION_DIR "*.msn");
629 add_missions_to_list(search_name, &count, anarchy_mode);
632 // move original missions (in story-chronological order)
633 // to top of mission list
635 promote("descent", &top_place, count); // original descent 1 mission
636 D1_Builtin_mission_num = top_place - 1;
637 promote(Builtin_mission_filename, &top_place, count); // d2 or d2demo
638 Builtin_mission_num = top_place - 1;
639 promote("d2x", &top_place, count); // vertigo
641 if (count > top_place)
642 qsort(&Mission_list[top_place],
644 sizeof(*Mission_list),
645 (int (*)( const void *, const void * ))ml_sort_func);
648 if (count > top_place)
649 qsort(&Mission_list[top_place],
651 sizeof(*Mission_list),
652 (int (*)( const void *, const void * ))ml_sort_func);
654 //load_mission(0); //set built-in mission as default
656 num_missions = count;
661 void init_extra_robot_movie(char *filename);
663 //values for built-in mission
665 //loads the specfied mission from the mission list.
666 //build_mission_list() must have been called.
667 //Returns true if mission loaded ok, else false.
668 int load_mission(int mission_num)
673 int enhanced_mission = 0;
675 if (mission_num == D1_Builtin_mission_num) {
676 cfile_use_descent1_hogfile("descent.hog");
677 switch (D1_Builtin_mission_hogsize) {
679 Int3(); // fall through
680 case D1_MISSION_HOGSIZE:
681 case D1_10_MISSION_HOGSIZE:
682 case D1_MAC_MISSION_HOGSIZE:
683 case D1_OEM_MISSION_HOGSIZE:
684 case D1_OEM_10_MISSION_HOGSIZE:
685 case D1_SHAREWARE_MISSION_HOGSIZE:
686 case D1_SHAREWARE_10_MISSION_HOGSIZE:
687 case D1_MAC_SHARE_MISSION_HOGSIZE:
688 return load_mission_d1(mission_num);
693 if (mission_num == Builtin_mission_num) {
694 switch (Builtin_mission_hogsize) {
695 case SHAREWARE_MISSION_HOGSIZE:
696 case MAC_SHARE_MISSION_HOGSIZE:
697 return load_mission_shareware(mission_num);
699 case OEM_MISSION_HOGSIZE:
700 return load_mission_oem(mission_num);
703 Int3(); // fall through
704 case FULL_MISSION_HOGSIZE:
705 case FULL_10_MISSION_HOGSIZE:
706 case MAC_FULL_MISSION_HOGSIZE:
707 // continue on... (use d2.mn2 from hogfile)
712 Current_mission_num = mission_num;
714 mprintf(( 0, "Loading mission %d\n", mission_num ));
716 //read mission from file
718 switch (Mission_list[mission_num].location) {
720 strcpy(buf,MISSION_DIR);
723 strcpy(buf,CDROM_dir);
726 Int3(); //fall through
731 strcat(buf,Mission_list[mission_num].filename);
732 if (Mission_list[mission_num].descent_version == 2)
737 mfile = cfopen(buf,"rb");
739 Current_mission_num = -1;
743 //for non-builtin missions, load HOG
744 if (strcmp(Mission_list[mission_num].filename, Builtin_mission_filename)) {
746 strcpy(buf+strlen(buf)-4,".hog"); //change extension
748 found_hogfile = cfile_use_alternate_hogfile(buf);
750 #ifdef RELEASE //for release, require mission to be in hogfile
751 if (! found_hogfile) {
753 Current_mission_num = -1;
758 // for Descent 1 missions, load descent.hog
759 if (Mission_list[mission_num].descent_version == 1 && strcmp(buf, "descent.hog"))
760 if (!cfile_use_descent1_hogfile("descent.hog"))
761 Warning("descent.hog not available, this mission may be missing some files required for briefings and exit sequence\n");
766 Last_secret_level = 0;
767 Briefing_text_filename[0] = 0;
768 Ending_text_filename[0] = 0;
770 while (mfgets(buf,80,mfile)) {
772 if (istok(buf,"name"))
773 continue; //already have name, go to next line
774 if (istok(buf,"xname")) {
775 enhanced_mission = 1;
776 continue; //already have name, go to next line
778 if (istok(buf,"zname")) {
779 enhanced_mission = 2;
780 continue; //already have name, go to next line
782 else if (istok(buf,"type"))
783 continue; //already have name, go to next line
784 else if (istok(buf,"hog")) {
787 while (*(bufp++) != '=')
791 while (*(++bufp) == ' ')
794 cfile_use_alternate_hogfile(bufp);
795 mprintf((0, "Hog file override = [%s]\n", bufp));
797 else if (istok(buf,"briefing")) {
798 if ((v = get_value(buf)) != NULL) {
801 strcpy(Briefing_text_filename,v);
804 else if (istok(buf,"ending")) {
805 if ((v = get_value(buf)) != NULL) {
808 strcpy(Ending_text_filename,v);
811 else if (istok(buf,"num_levels")) {
813 if ((v=get_value(buf))!=NULL) {
818 for (i=0;i<n_levels && mfgets(buf,80,mfile);i++) {
821 if (strlen(buf) <= 12) {
822 strcpy(Level_names[i],buf);
831 else if (istok(buf,"num_secrets")) {
832 if ((v=get_value(buf))!=NULL) {
835 N_secret_levels = atoi(v);
837 Assert(N_secret_levels <= MAX_SECRET_LEVELS_PER_MISSION);
839 for (i=0;i<N_secret_levels && mfgets(buf,80,mfile);i++) {
843 if ((t=strchr(buf,','))!=NULL) *t++=0;
848 if (strlen(buf) <= 12) {
849 strcpy(Secret_level_names[i],buf);
850 Secret_level_table[i] = atoi(t);
851 if (Secret_level_table[i]<1 || Secret_level_table[i]>Last_level)
866 if (Last_level <= 0) {
867 Current_mission_num = -1; //no valid mission loaded
871 Current_mission_filename = Mission_list[Current_mission_num].filename;
872 Current_mission_longname = Mission_list[Current_mission_num].mission_name;
874 if (enhanced_mission) {
876 extern void bm_read_extra_robots();
877 sprintf(t,"%s.ham",Current_mission_filename);
878 bm_read_extra_robots(t,enhanced_mission);
879 strncpy(t,Current_mission_filename,6);
881 init_extra_robot_movie(t);
887 //loads the named mission if exists.
888 //Returns true if mission loaded ok, else false.
889 int load_mission_by_name(char *mission_name)
893 n = build_mission_list(1);
896 if (!stricmp(mission_name,Mission_list[i].filename))
897 return load_mission(i);
899 return 0; //couldn't find mission