summaryrefslogtreecommitdiff
path: root/src/m_misc.c
blob: bcf06f4168f86d16de1c5489c6977b2099855f28 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//
// DESCRIPTION:
//	Main loop menu stuff.
//	Default Config File.
//	PCX Screenshots.
//
//-----------------------------------------------------------------------------


#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

// for mkdir:

#ifdef _WIN32
#include <io.h>
#else
#include <sys/stat.h>
#include <sys/types.h>
#endif

#include "config.h"
#include "deh_main.h"
#include "doomdef.h"
#include "doomfeatures.h"

#include "z_zone.h"

#include "m_menu.h"
#include "m_swap.h"
#include "m_argv.h"
#include "net_client.h"

#include "w_wad.h"

#include "i_system.h"
#include "i_video.h"
#include "v_video.h"

#include "hu_stuff.h"

// State.
#include "doomstat.h"

// Data.
#include "dstrings.h"

#include "m_misc.h"

//
// M_DrawText
// Returns the final X coordinate
// HU_Init must have been called to init the font
//
extern patch_t*		hu_font[HU_FONTSIZE];

int
M_DrawText
( int		x,
  int		y,
  boolean	direct,
  char*		string )
{
    int 	c;
    int		w;

    while (*string)
    {
	c = toupper(*string) - HU_FONTSTART;
	string++;
	if (c < 0 || c> HU_FONTSIZE)
	{
	    x += 4;
	    continue;
	}
		
	w = SHORT (hu_font[c]->width);
	if (x+w > SCREENWIDTH)
	    break;
	if (direct)
	    V_DrawPatchDirect(x, y, 0, hu_font[c]);
	else
	    V_DrawPatch(x, y, 0, hu_font[c]);
	x+=w;
    }

    return x;
}

//
// Create a directory
//

void M_MakeDirectory(char *path)
{
#ifdef _WIN32
    mkdir(path);
#else
    mkdir(path, 0755);
#endif
}




//
// M_WriteFile
//
boolean M_WriteFile(char const *name, void *source, int	length)
{
    FILE *handle;
    int	count;
	
    handle = fopen(name, "wb");

    if (handle == NULL)
	return false;

    count = fwrite(source, 1, length, handle);
    fclose(handle);
	
    if (count < length)
	return false;
		
    return true;
}


//
// M_ReadFile
//
int M_ReadFile(char const *name, byte **buffer)
{
    FILE *handle;
    int	count, length;
    byte *buf;
	
    handle = fopen(name, "rb");
    if (handle == NULL)
	I_Error ("Couldn't read file %s", name);

    // find the size of the file by seeking to the end and
    // reading the current position

    fseek(handle, 0, SEEK_END);
    length = ftell(handle);
    fseek(handle, 0, SEEK_SET);
    
    buf = Z_Malloc (length, PU_STATIC, NULL);
    count = fread(buf, 1, length, handle);
    fclose (handle);
	
    if (count < length)
	I_Error ("Couldn't read file %s", name);
		
    *buffer = buf;
    return length;
}


//
// DEFAULTS
//

// Location where all configuration data is stored - 
// default.cfg, savegames, etc.

char *          configdir;


int		usemouse = 1;
int		usejoystick = 0;

extern int	key_right;
extern int	key_left;
extern int	key_up;
extern int	key_down;

extern int	key_strafeleft;
extern int	key_straferight;

extern int	key_fire;
extern int	key_use;
extern int	key_strafe;
extern int	key_speed;

extern int	mousebfire;
extern int	mousebstrafe;
extern int	mousebforward;

extern int	joybfire;
extern int	joybstrafe;
extern int	joybuse;
extern int	joybspeed;

extern int	viewwidth;
extern int	viewheight;

extern int	mouseSensitivity;
extern int	showMessages;

// machine-independent sound params
extern	int	numChannels;


extern char*	chat_macros[];

extern int      show_endoom;
extern int      vanilla_savegame_limit;
extern int      vanilla_demo_limit;

extern int snd_musicdevice;
extern int snd_sfxdevice;

// dos specific options: these are unused but should be maintained
// so that the config file can be shared between chocolate
// doom and doom.exe

static int snd_sbport = 0;
static int snd_sbirq = 0;
static int snd_sbdma = 0;
static int snd_mport = 0;

typedef enum 
{
    DEFAULT_INT,
    DEFAULT_STRING,
    DEFAULT_FLOAT,
    DEFAULT_KEY,
} default_type_t;

typedef struct
{
    // Name of the variable
    char *         name;

    // Pointer to the location in memory of the variable
    void *         location;

    // Type of the variable
    default_type_t type;

    // If this is a key value, the original integer scancode we read from
    // the config file before translating it to the internal key value.
    // If zero, we didn't read this value from a config file.
    int            untranslated;

    // The value we translated the scancode into when we read the 
    // config file on startup.  If the variable value is different from
    // this, it has been changed and needs to be converted; otherwise,
    // use the 'untranslated' value.
    int            original_translated;
} default_t;

typedef struct
{
    default_t *defaults;
    int        numdefaults;
    char      *filename;
} default_collection_t;

static default_t	doom_defaults_list[] =
{
    {"mouse_sensitivity", &mouseSensitivity, DEFAULT_INT, 0, 0},
    {"sfx_volume",&sfxVolume, DEFAULT_INT, 0, 0},
    {"music_volume",&musicVolume, DEFAULT_INT, 0, 0},
    {"show_messages",&showMessages, DEFAULT_INT, 0, 0},

    {"key_right",&key_right, DEFAULT_KEY, 0, 0},
    {"key_left",&key_left, DEFAULT_KEY, 0, 0},
    {"key_up",&key_up, DEFAULT_KEY, 0, 0},
    {"key_down",&key_down, DEFAULT_KEY, 0, 0},
    {"key_strafeleft",&key_strafeleft, DEFAULT_KEY, 0, 0},
    {"key_straferight",&key_straferight, DEFAULT_KEY, 0, 0},

    {"key_fire",&key_fire, DEFAULT_KEY, 0, 0},
    {"key_use",&key_use, DEFAULT_KEY, 0, 0},
    {"key_strafe",&key_strafe, DEFAULT_KEY, 0, 0},
    {"key_speed",&key_speed, DEFAULT_KEY, 0, 0},

    {"use_mouse",&usemouse, DEFAULT_INT, 0, 0},
    {"mouseb_fire",&mousebfire, DEFAULT_INT, 0, 0},
    {"mouseb_strafe",&mousebstrafe, DEFAULT_INT, 0, 0},
    {"mouseb_forward",&mousebforward, DEFAULT_INT, 0, 0},

    {"use_joystick",&usejoystick, DEFAULT_INT, 0, 0},
    {"joyb_fire",&joybfire, DEFAULT_INT, 0, 0},
    {"joyb_strafe",&joybstrafe, DEFAULT_INT, 0, 0},
    {"joyb_use",&joybuse, DEFAULT_INT, 0, 0},
    {"joyb_speed",&joybspeed, DEFAULT_INT, 0, 0},

    {"screenblocks",&screenblocks, DEFAULT_INT, 0, 0},
    {"detaillevel",&detailLevel, DEFAULT_INT, 0, 0},

    {"snd_channels",&numChannels, DEFAULT_INT, 0, 0},

    {"snd_musicdevice", &snd_musicdevice, DEFAULT_INT, 0, 0},
    {"snd_sfxdevice", &snd_sfxdevice, DEFAULT_INT, 0, 0},
    {"snd_sbport", &snd_sbport, DEFAULT_INT, 0, 0},
    {"snd_sbirq", &snd_sbirq, DEFAULT_INT, 0, 0},
    {"snd_sbdma", &snd_sbdma, DEFAULT_INT, 0, 0},
    {"snd_mport", &snd_mport, DEFAULT_INT, 0, 0},

    {"usegamma", &usegamma, DEFAULT_INT, 0, 0},

    {"chatmacro0", &chat_macros[0], DEFAULT_STRING, 0 },
    {"chatmacro1", &chat_macros[1], DEFAULT_STRING, 0 },
    {"chatmacro2", &chat_macros[2], DEFAULT_STRING, 0 },
    {"chatmacro3", &chat_macros[3], DEFAULT_STRING, 0 },
    {"chatmacro4", &chat_macros[4], DEFAULT_STRING, 0 },
    {"chatmacro5", &chat_macros[5], DEFAULT_STRING, 0 },
    {"chatmacro6", &chat_macros[6], DEFAULT_STRING, 0 },
    {"chatmacro7", &chat_macros[7], DEFAULT_STRING, 0 },
    {"chatmacro8", &chat_macros[8], DEFAULT_STRING, 0 },
    {"chatmacro9", &chat_macros[9], DEFAULT_STRING, 0 },
};

static default_collection_t doom_defaults = 
{
    doom_defaults_list,
    sizeof(doom_defaults_list) / sizeof(*doom_defaults_list),
    NULL,
};

static default_t extra_defaults_list[] = 
{
    {"autoadjust_video_settings",   &autoadjust_video_settings, DEFAULT_INT, 0, 0},
    {"fullscreen",                  &fullscreen, DEFAULT_INT, 0, 0},
    {"startup_delay",               &startup_delay, DEFAULT_INT, 0, 0},
    {"screenmultiply",              &screenmultiply, DEFAULT_INT, 0, 0},
    {"grabmouse",                   &grabmouse, DEFAULT_INT, 0, 0},
    {"novert",                      &novert, DEFAULT_INT, 0, 0},
    {"mouse_acceleration",          &mouse_acceleration, DEFAULT_FLOAT, 0, 0},
    {"mouse_threshold",             &mouse_threshold, DEFAULT_INT, 0, 0},
    {"show_endoom",                 &show_endoom, DEFAULT_INT, 0, 0},
    {"vanilla_savegame_limit",      &vanilla_savegame_limit, DEFAULT_INT, 0, 0},
    {"vanilla_demo_limit",          &vanilla_demo_limit, DEFAULT_INT, 0, 0},
#ifdef FEATURE_MULTIPLAYER
    {"player_name",                 &net_player_name,          DEFAULT_STRING, 0, 0},
#endif
};

static default_collection_t extra_defaults =
{
    extra_defaults_list,
    sizeof(extra_defaults_list) / sizeof(*extra_defaults_list),
    NULL,
};

static int scantokey[128] =
{
    0  ,    27,     '1',    '2',    '3',    '4',    '5',    '6',
    '7',    '8',    '9',    '0',    '-',    '=',    KEY_BACKSPACE, 9,
    'q',    'w',    'e',    'r',    't',    'y',    'u',    'i',
    'o',    'p',    '[',    ']',    13,		KEY_RCTRL, 'a',    's',
    'd',    'f',    'g',    'h',    'j',    'k',    'l',    ';',
    '\'',   '`',    KEY_RSHIFT,'\\',   'z',    'x',    'c',    'v',
    'b',    'n',    'm',    ',',    '.',    '/',    KEY_RSHIFT,KEYP_MULTIPLY,
    KEY_RALT,  ' ',  KEY_CAPSLOCK,KEY_F1,  KEY_F2,   KEY_F3,   KEY_F4,   KEY_F5,
    KEY_F6,   KEY_F7,   KEY_F8,   KEY_F9,   KEY_F10,  KEY_PAUSE,KEY_SCRLCK,KEY_HOME,
    KEYP_UPARROW,KEY_PGUP,KEYP_MINUS,KEYP_LEFTARROW,KEYP_5,KEYP_RIGHTARROW,KEYP_PLUS,KEY_END,
    KEYP_DOWNARROW,KEY_PGDN,KEY_INS,KEY_DEL,0,   0,      0,      KEY_F11,
    KEY_F12,  0,      0,      0,      0,      0,      0,      0,
    0,      0,      0,      0,      0,      0,      0,      0,
    0,      0,      0,      0,      0,      0,      0,      0,
    0,      0,      0,      0,      0,      0,      0,      0,
    0,      0,      0,      0,      0,      0,      0,      0
};


static void SaveDefaultCollection(default_collection_t *collection)
{
    default_t *defaults;
    int i, v;
    FILE *f;
	
    f = fopen (collection->filename, "w");
    if (!f)
	return; // can't write the file, but don't complain

    defaults = collection->defaults;
		
    for (i=0 ; i<collection->numdefaults ; i++)
    {
        int chars_written;

        // Print the name and line up all values at 30 characters

        chars_written = fprintf(f, "%s ", defaults[i].name);

        for (; chars_written < 30; ++chars_written)
            fprintf(f, " ");

        // Print the value

        switch (defaults[i].type) 
        {
            case DEFAULT_KEY:

                // use the untranslated version if we can, to reduce
                // the possibility of screwing up the user's config
                // file
                
                v = * (int *) defaults[i].location;

                if (defaults[i].untranslated
                 && v == defaults[i].original_translated)
                {
                    // Has not been changed since the last time we
                    // read the config file.

                    v = defaults[i].untranslated;
                }
                else
                {
                    // search for a reverse mapping back to a scancode
                    // in the scantokey table

                    int s;

                    for (s=0; s<128; ++s)
                    {
                        if (scantokey[s] == v)
                        {
                            v = s;
                            break;
                        }
                    }
                }

	        fprintf(f, "%i", v);
                break;

            case DEFAULT_INT:
	        fprintf(f, "%i", * (int *) defaults[i].location);
                break;

            case DEFAULT_FLOAT:
                fprintf(f, "%f", * (float *) defaults[i].location);
                break;

            case DEFAULT_STRING:
	        fprintf(f,"\"%s\"", * (char **) (defaults[i].location));
                break;
        }

        fprintf(f, "\n");
    }

    fclose (f);
}

// Parses integer values in the configuration file

static int ParseIntParameter(char *strparm)
{
    int parm;

    if (strparm[0] == '0' && strparm[1] == 'x')
        sscanf(strparm+2, "%x", &parm);
    else
        sscanf(strparm, "%i", &parm);

    return parm;
}

static void LoadDefaultCollection(default_collection_t *collection)
{
    default_t  *defaults = collection->defaults;
    int		i;
    FILE*	f;
    char	defname[80];
    char	strparm[100];

    // read the file in, overriding any set defaults
    f = fopen(collection->filename, "r");

    if (!f)
    {
        // File not opened, but don't complain

        return;
    }
    
    while (!feof(f))
    {
        if (fscanf (f, "%79s %[^\n]\n", defname, strparm) != 2)
        {
            // This line doesn't match
          
            continue;
        }

        // Strip off trailing non-printable characters (\r characters
        // from DOS text files)

        while (strlen(strparm) > 0 && !isprint(strparm[strlen(strparm)-1]))
        {
            strparm[strlen(strparm)-1] = '\0';
        }
        
        // Find the setting in the list
       
        for (i=0; i<collection->numdefaults; ++i)
        {
            default_t *def = &collection->defaults[i];
            char *s;
            int intparm;

            if (strcmp(defname, def->name) != 0)
            {
                // not this one
                continue;
            }

            // parameter found

            switch (def->type)
            {
                case DEFAULT_STRING:
                    s = strdup(strparm + 1);
                    s[strlen(s) - 1] = '\0';
                    * (char **) def->location = s;
                    break;

                case DEFAULT_INT:
                    * (int *) def->location = ParseIntParameter(strparm);
                    break;

                case DEFAULT_KEY:

                    // translate scancodes read from config
                    // file (save the old value in untranslated)

                    intparm = ParseIntParameter(strparm);
                    defaults[i].untranslated = intparm;
                    intparm = scantokey[intparm];

                    defaults[i].original_translated = intparm;
                    * (int *) def->location = intparm;
                    break;

                case DEFAULT_FLOAT:
                    * (float *) def->location = atof(strparm);
                    break;
            }

            // finish

            break; 
        }
    }
            
    fclose (f);
}

//
// M_SaveDefaults
//

void M_SaveDefaults (void)
{
    SaveDefaultCollection(&doom_defaults);
    SaveDefaultCollection(&extra_defaults);
}


//
// M_LoadDefaults
//

void M_LoadDefaults (void)
{
    int i;
 
    // check for a custom default file
    i = M_CheckParm ("-config");

    if (i && i<myargc-1)
    {
	doom_defaults.filename = myargv[i+1];
	printf ("	default file: %s\n",doom_defaults.filename);
    }
    else
    {
        doom_defaults.filename = malloc(strlen(configdir) + 20);
        sprintf(doom_defaults.filename, "%sdefault.cfg", configdir);
    }

    printf("saving config in %s\n", doom_defaults.filename);

    i = M_CheckParm("-extraconfig");

    if (i && i<myargc-1)
    {
        extra_defaults.filename = myargv[i+1];
        printf("        extra configuration file: %s\n", 
               extra_defaults.filename);
    }
    else
    {
        extra_defaults.filename 
            = malloc(strlen(configdir) + strlen(PACKAGE_TARNAME) + 10);
        sprintf(extra_defaults.filename, "%s%s.cfg", 
                configdir, PACKAGE_TARNAME);
    }

    LoadDefaultCollection(&doom_defaults);
    LoadDefaultCollection(&extra_defaults);
}

// 
// SetConfigDir:
//
// Sets the location of the configuration directory, where configuration
// files are stored - default.cfg, chocolate-doom.cfg, savegames, etc.
//

void M_SetConfigDir(void)
{
    char *homedir;

    homedir = getenv("HOME");

    if (homedir != NULL)
    {
        // put all configuration in a config directory off the
        // homedir

        configdir = malloc(strlen(homedir) + strlen(PACKAGE_TARNAME) + 5);

        sprintf(configdir, "%s/.%s/", homedir, PACKAGE_TARNAME);

        // make the directory if it doesnt already exist

        M_MakeDirectory(configdir);
    }
    else
    {
#ifdef _WIN32
        // when given the -cdrom option, save config+savegames in 
        // c:\doomdata.  This only applies under Windows.

        if (M_CheckParm("-cdrom") > 0)
        {
            printf(D_CDROM);
            configdir = strdup("c:\\doomdata\\");

            M_MakeDirectory(configdir);
        }
        else
#endif
        {
            configdir = strdup("");
        }
    }
}



//
// SCREEN SHOTS
//


typedef struct
{
    char		manufacturer;
    char		version;
    char		encoding;
    char		bits_per_pixel;

    unsigned short	xmin;
    unsigned short	ymin;
    unsigned short	xmax;
    unsigned short	ymax;
    
    unsigned short	hres;
    unsigned short	vres;

    unsigned char	palette[48];
    
    char		reserved;
    char		color_planes;
    unsigned short	bytes_per_line;
    unsigned short	palette_type;
    
    char		filler[58];
    unsigned char	data;		// unbounded
} pcx_t;


//
// WritePCXfile
//
void
WritePCXfile
( char*		filename,
  byte*		data,
  int		width,
  int		height,
  byte*		palette )
{
    int		i;
    int		length;
    pcx_t*	pcx;
    byte*	pack;
	
    pcx = Z_Malloc (width*height*2+1000, PU_STATIC, NULL);

    pcx->manufacturer = 0x0a;		// PCX id
    pcx->version = 5;			// 256 color
    pcx->encoding = 1;			// uncompressed
    pcx->bits_per_pixel = 8;		// 256 color
    pcx->xmin = 0;
    pcx->ymin = 0;
    pcx->xmax = SHORT(width-1);
    pcx->ymax = SHORT(height-1);
    pcx->hres = SHORT(width);
    pcx->vres = SHORT(height);
    memset (pcx->palette,0,sizeof(pcx->palette));
    pcx->color_planes = 1;		// chunky image
    pcx->bytes_per_line = SHORT(width);
    pcx->palette_type = SHORT(2);	// not a grey scale
    memset (pcx->filler,0,sizeof(pcx->filler));


    // pack the image
    pack = &pcx->data;
	
    for (i=0 ; i<width*height ; i++)
    {
	if ( (*data & 0xc0) != 0xc0)
	    *pack++ = *data++;
	else
	{
	    *pack++ = 0xc1;
	    *pack++ = *data++;
	}
    }
    
    // write the palette
    *pack++ = 0x0c;	// palette ID byte
    for (i=0 ; i<768 ; i++)
	*pack++ = *palette++;
    
    // write output file
    length = pack - (byte *)pcx;
    M_WriteFile (filename, pcx, length);

    Z_Free (pcx);
}

static boolean FileExists(char *filename)
{
    FILE *handle;

    handle = fopen(filename, "rb");

    if (handle != NULL)
    {
        fclose(handle);
        return true;
    }
    else
    {
        return false;
    }
}

//
// M_ScreenShot
//
void M_ScreenShot (void)
{
    int		i;
    byte*	linear;
    char	lbmname[12];
    
    // munge planar buffer to linear
    linear = screens[2];
    I_ReadScreen (linear);
    
    // find a file name to save it to
    strcpy(lbmname,"DOOM00.pcx");
		
    for (i=0 ; i<=99 ; i++)
    {
	lbmname[4] = i/10 + '0';
	lbmname[5] = i%10 + '0';
	if (!FileExists(lbmname))
	    break;	// file doesn't exist
    }
    if (i==100)
	I_Error ("M_ScreenShot: Couldn't create a PCX");
    
    // save the pcx file
    WritePCXfile (lbmname, linear,
		  SCREENWIDTH, SCREENHEIGHT,
		  W_CacheLumpName (DEH_String("PLAYPAL"),PU_CACHE));
	
    players[consoleplayer].message = DEH_String("screen shot");
}