simple-cache.c 37.7 KB
Newer Older
Per Cederqvist's avatar
Per Cederqvist committed
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
/*
 * This module contains some simple simulations of the routines in
 * cache.c.
 *
 * Extracted from ram-cache.c and rewritten by ceder.
 *
 * New database format with texts in their own file by Inge Wallin.
 *
 * New save algorithm by ceder.
 */


/*
 * Possible improvements: +++
 *  When there are consecutive items in file A that shall be copied
 *  to file B, copy them in one transfer (up to a certain limit).
 *
 *  In pre_sync: compute size of, and allocate disk space for file B.
 */

/*
 * All functions that can fail sets kom_errno to a suitable value
 * if they fail.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/file.h>

#include <kom-errno.h>
#include <kom-types.h>
Per Cederqvist's avatar
Per Cederqvist committed
33
#include "s-collat-tabs.h"
Per Cederqvist's avatar
Per Cederqvist committed
34
#include "smalloc.h"
Per Cederqvist's avatar
Per Cederqvist committed
35
#include <parser.h>
Per Cederqvist's avatar
Per Cederqvist committed
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
#include "cache.h"
#include <debug.h>
#include "lyskomd.h"
#include "ram-parse.h"
#include "log.h"
#include "com.h"
#include "isc.h"
#include "ram-output.h"
#include "connections.h"
#include "prot-a-output.h"
#include "send-async.h"
#include "memory.h"
#include "exp.h"

#include "limits.h"
51
#include "cache-node.h"
Per Cederqvist's avatar
Per Cederqvist committed
52
53

static Small_conf	* small_conf_arr[ MAX_CONF ];
54
55
static Cache_node_mcb	* pers_mcb;
static Cache_node_mcb 	* conf_mcb;
Per Cederqvist's avatar
Per Cederqvist committed
56
57
static int		  next_free_num = 1;

58
59
static Cache_node_mcb 	* text_mcb;
static int		  next_text_num = 1;
Per Cederqvist's avatar
Per Cederqvist committed
60
61

/* Defined in ramkomd.c */
Per Cederqvist's avatar
Per Cederqvist committed
62
63
64
extern char datafilename[FILENAME_MAX];
extern char backupfilename[FILENAME_MAX];
extern char textfilename[FILENAME_MAX];
Per Cederqvist's avatar
Per Cederqvist committed
65
66
67
68
69
70
71

/*
 * The elements in the following lists with same index refers to the same
 * conference.
 */
static int    no_of_match_info;
EXPORT Matching_info *match_table = NULL;
Per Cederqvist's avatar
Per Cederqvist committed
72
EXPORT Conf_no       *conf_table  = NULL; /* Used in conference.c. */
Per Cederqvist's avatar
Per Cederqvist committed
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


static FILE	*text_file= NULL;
static FILE	*file_a = NULL;	/* Current file. */
static FILE	*file_b = NULL;	/* File under construction. */

/*
 * Four state variables for the background save.
 */
static enum {
    sync_save_conf,
    sync_save_pers,
    sync_save_text,
    sync_error,
    sync_wait,
    sync_ready
} sync_state;

static long sync_next;

static Conf_no highest_conf_no;
static Text_no highest_text_no;

BUGDECL;


/* Macros */

#define TRACE2(format, arg) if ( buglevel > 2 ) printf(format, arg)
#define TRACE1(format) if ( buglevel > 2 ) printf(format)
#define TRACESTR(str)  if ( buglevel > 2 ) s_puts(str)


static Person *
read_person(FILE *fp,
	    long pos,
	    long size)
{
    Person *p;

    p = alloc_person();
    fseek(fp, pos+1, SEEK_SET);	/* Skip '+' */
    if ( fparse_person(fp, p) != OK )
    {
	free_person(p);
	return NULL;
    }
    else
	return p;
}



static Conference *
read_conference(FILE *fp,
		long pos,
		long size)
{
    Conference *c;

    c = alloc_conference();
    fseek(fp, pos+1, SEEK_SET);	/* Skip '+' */
    if ( fparse_conference(fp, c) != OK )
    {
	free_conference(c);
	return NULL;
    }
    else
	return c;
}
	

static Text_stat *
read_text_stat(FILE *fp,
	       long pos,
	       long size)
{
    Text_stat *t;

    t = alloc_text_stat();
    fseek(fp, pos+1, SEEK_SET);	/* Skip '+' */
    if ( fparse_text_stat(fp, t) != OK )
    {
	free_text_stat(t);
	return NULL;
    }
    else
	return t;
}

static void
164
pers_set_mru(Pers_no pers_no)
Per Cederqvist's avatar
Per Cederqvist committed
165
{
166
    set_mru(pers_mcb, pers_no);
Per Cederqvist's avatar
Per Cederqvist committed
167
168
169
}

static void
170
text_set_mru(Text_no text_no)
Per Cederqvist's avatar
Per Cederqvist committed
171
{
172
    set_mru(text_mcb, text_no);
Per Cederqvist's avatar
Per Cederqvist committed
173
174
175
}

static void
176
conf_set_mru(Conf_no conf_no)
Per Cederqvist's avatar
Per Cederqvist committed
177
{
178
179
    set_mru(conf_mcb, conf_no);
}
Per Cederqvist's avatar
Per Cederqvist committed
180

181
182
183
184
static Cache_node *
get_pers_node(Pers_no pers_no)
{
    return get_cache_node(pers_mcb, pers_no);
Per Cederqvist's avatar
Per Cederqvist committed
185
186
187
}

static void
188
unlink_text_lru (Cache_node *node)
Per Cederqvist's avatar
Per Cederqvist committed
189
{
190
    unlink_lru (node, &text_mcb->lru, &text_mcb->mru);
Per Cederqvist's avatar
Per Cederqvist committed
191
192
}

193
194
195
196
197
static void
unlink_conf_lru (Cache_node *node)
{
    unlink_lru (node, &conf_mcb->lru, &conf_mcb->mru);
}
Per Cederqvist's avatar
Per Cederqvist committed
198
199

static void
200
unlink_pers_lru (Cache_node *node)
Per Cederqvist's avatar
Per Cederqvist committed
201
{
202
203
    unlink_lru (node, &pers_mcb->lru, &pers_mcb->mru);
}
Per Cederqvist's avatar
Per Cederqvist committed
204

205
206
207
208
209
static Cache_node *
get_conf_node(Conf_no conf_no)
{
    return get_cache_node(conf_mcb, conf_no);
}
Per Cederqvist's avatar
Per Cederqvist committed
210

211
212
213
214
static Cache_node *
get_text_node(Text_no text_no)
{
    return get_cache_node(text_mcb, text_no);
Per Cederqvist's avatar
Per Cederqvist committed
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
}

	
/*
 * Name caching routines
 */

/*
 * change_name changes the cached conference name. It is only called when
 * a conference name is changed or a conference is deleted.
 */
void
cached_change_name( Conf_no name_num,
		    String new_name )
{
    if ( name_num < 1 || name_num >= next_free_num )
	restart_kom("cached_change_name(%d, ----): next_free_num==%d",
		    name_num, next_free_num);

    s_clear( &small_conf_arr[name_num]->name );
    s_strcpy( &small_conf_arr[name_num]->name, new_name);
    build_matching_info();
}


extern void
cached_set_conf_type (Conf_no   conf_no,
		      Conf_type type)
{
    if ( conf_no < 1 || conf_no >= next_free_num )
	restart_kom("cached_set_conf_type(%d, ----): next_free_num==%d",
		    conf_no, next_free_num);

    small_conf_arr[ conf_no ]->type = type;
}


extern Conf_type
cached_get_conf_type (Conf_no conf_no)
{
    if ( conf_no < 1 || conf_no >= next_free_num )
	restart_kom("cached_get_conf_type(%d): next_free_num==%d",
		    conf_no, next_free_num);
258
259
260
261
262

    if ( small_conf_arr [ conf_no ] == NULL )
	restart_kom("cached_get_conf_type(%d): conference does not exist.\n",
		    conf_no);

Per Cederqvist's avatar
Per Cederqvist committed
263
264
265
266
267
268
269
270
271
272
273
274
    return small_conf_arr [ conf_no ]->type;
}



/*
 * Various function calls to tell the cache that something is changed.
 */

void
mark_person_as_changed(Pers_no	pers_no)
{
275
276
277
278
    Cache_node *node;

    node = get_pers_node(pers_no);
    
Per Cederqvist's avatar
Per Cederqvist committed
279
    TRACE2("Person %d is changed\n", pers_no);
280
    if ( node == NULL || node->s.exists == 0)
Per Cederqvist's avatar
Per Cederqvist committed
281
282
	restart_kom("mark_person_as_changed(%d): nonexistent.\n", pers_no);

283
    node->s.dirty = 1;
Per Cederqvist's avatar
Per Cederqvist committed
284
285
286
287
288
289
290
    pers_set_mru( pers_no );
}


void
mark_conference_as_changed(Conf_no	conf_no)
{
291
292
293
294
    Cache_node *node;

    node = get_conf_node (conf_no);

Per Cederqvist's avatar
Per Cederqvist committed
295
    TRACE2("Conf.  %d is changed\n", conf_no);
296
    if ( node == NULL || node->s.exists == 0)
Per Cederqvist's avatar
Per Cederqvist committed
297
298
	restart_kom("mark_conference_as_changed(%d): nonexistent.\n", conf_no);

299
    node->s.dirty = 1;
Per Cederqvist's avatar
Per Cederqvist committed
300
301
    conf_set_mru( conf_no );
    small_conf_arr[ conf_no ]->highest_local_no
302
303
	= (((Conference *)node->ptr)->texts.first_local_no - 1
	   + ((Conference *)node->ptr)->texts.no_of_texts );
Per Cederqvist's avatar
Per Cederqvist committed
304
305
306
307
308
}

void
mark_text_as_changed( Text_no text_no )
{
309
310
311
312
    Cache_node *node;

    node = get_text_node (text_no);

Per Cederqvist's avatar
Per Cederqvist committed
313
314
    TRACE2("Text %d is changed.\n", text_no);
    if ( text_no < 1 || text_no >= next_text_num
315
	|| node == NULL || node->s.exists == 0)
Per Cederqvist's avatar
Per Cederqvist committed
316
317
318
319
    {
	restart_kom("mark_text_as_changed(%d): nonexistent.\n", text_no);
    }

320
321
    node->s.dirty = 1;
    text_set_mru (text_no);
Per Cederqvist's avatar
Per Cederqvist committed
322
323
324
325
326
327
328
329
330
331
332
333
}    



/*
 * Person-related calls
 */


extern Success
cached_create_person( Pers_no person )
{
334
335
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
336
337
338
339
340
341
342
343
    TRACE2("Person %d is being created.\n", person);

    if ( person < 1 || person >= next_free_num )
    {
	restart_kom("cached_create_person(%d): next_free_num == %d.\n",
		    person, next_free_num);
    }

344
    if ( get_pers_node(person) != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
345
346
347
348
349
    {
	restart_kom("cached_create_person(%d): Person existed.\n",
		    person);
    }

350
351
352
353
354
355
356
357
358
    create_cache_node (pers_mcb, person);
    node = get_pers_node (person);

    if ( node == NULL )
	restart_kom("cached_create_person(): couldn't get cache_node.\n");
    
    node->ptr = alloc_person();
    node->s.dirty = 1;
    node->s.exists = 1;
Per Cederqvist's avatar
Per Cederqvist committed
359
360
361
362
363
364
365
366
    pers_set_mru( person );
    return OK;
}


extern Person *
cached_get_person_stat( Pers_no	person )
{
367
368
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
369
370
371
372
373
374
375
    TRACE2("cached_get_person_stat %d\n", person);

    if ( person == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return NULL;
    }
376
377
378
379
380

    node = get_pers_node (person);

    if ( person >= next_free_num || node == NULL
	|| node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
381
382
383
384
385
    {
	kom_errno = KOM_UNDEF_PERS;
	return NULL;
    }

386
    if ( node->ptr != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
387
388
    {
	pers_set_mru( person );
389
	++pers_mcb->hits;
390
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
391
392
    }

393
    if ( node->snap_shot != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
394
    {
395
	node->ptr = copy_person (node->snap_shot);
Per Cederqvist's avatar
Per Cederqvist committed
396
	pers_set_mru (person);
397
	++pers_mcb->hits;
398
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
399
400
    }

401
    node->ptr = read_person(file_a, node->pos, node->size);
Per Cederqvist's avatar
Per Cederqvist committed
402

403
    ++pers_mcb->misses;
Per Cederqvist's avatar
Per Cederqvist committed
404
    pers_set_mru (person);
405
    return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
406
407
408
409
410
411
}


/*
 * Conference-related calls
 */
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


static int no_of_allocated_small_confs = 0;

static void
free_small_conf (Small_conf *sc)
{
    if ( sc != NULL )
    {
	--no_of_allocated_small_confs;
	s_clear ( &sc->name );
	sfree (sc);
    }
}


static Small_conf *
alloc_small_conf(void)
{
    Small_conf *s;
    s = smalloc(sizeof(Small_conf));
    *s = EMPTY_SMALL_CONF;
    ++no_of_allocated_small_confs;

    return s;
}


Per Cederqvist's avatar
Per Cederqvist committed
440
441
442
443
444
extern Conf_no	/* Also cache the name */
cached_create_conf (String  name)
{
    Conference * conf_c;
    Conf_no	 conf_no;
445
    Cache_node  *node;
Per Cederqvist's avatar
Per Cederqvist committed
446
447
448
449
450
451
452
453
454
455
456
457
458

    TRACE1("cached_create_conf( ");
    TRACESTR(name);
    TRACE1(" )\n");

    if ( next_free_num >= MAX_CONF )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	return 0;
    }
    
    conf_no = next_free_num++;

459
460
461
462
463
464
465
466
467
    create_cache_node (conf_mcb, conf_no);
    node = get_conf_node (conf_no);

    if ( node == NULL )
	restart_kom("cached_create_conf(): failed to allocate cache_node.\n");
    
    node->s.exists = 1;
    node->s.dirty = 1;
    node->ptr = conf_c = alloc_conference();
Per Cederqvist's avatar
Per Cederqvist committed
468
469
    conf_set_mru(conf_no);    

470
    zero_init_cache_node (pers_mcb, conf_no);
Per Cederqvist's avatar
Per Cederqvist committed
471
472
473
474
475
476
    small_conf_arr[ conf_no ] = alloc_small_conf();

    conf_c->name = EMPTY_STRING;
    s_strcpy(&conf_c->name, name);
    cached_change_name( conf_no, name);

477
    TRACE2("Created conference number %d\n", conf_no);
Per Cederqvist's avatar
Per Cederqvist committed
478
479
480
481
482
483
484
485
    
    return conf_no;
}


extern Success
cached_delete_conf( Conf_no	conf )
{
486
487
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
488
489
490
491
492
    if ( conf == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return FAILURE;
    }
493
494
495
496

    node = get_conf_node (conf);

    if ( conf >= next_free_num || node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
497
498
499
500
501
    {
	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }

502
503
504
    if ( node->lock_cnt > 0 )
	log("WNG: cached_delete_conf(%d): lock_cnt === %d\n",
	    conf, node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
505

506
507
508
    free_conference(node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
Per Cederqvist's avatar
Per Cederqvist committed
509
510
511
512
513
514
515

    return OK;
}

Success
cached_delete_person(Pers_no pers)
{
516
517
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
518
519
520
521
522
    if ( pers == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return FAILURE;
    }
523
524
525
526

    node = get_pers_node (pers);

    if ( pers >= next_free_num || node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
527
528
529
530
531
532
533
    {
	log("cached_delete_person(): attempt to"
	    " delete non-existing person.\n");
	kom_errno = KOM_UNDEF_PERS;
	return FAILURE;
    }

534
    if ( node->lock_cnt > 0 )
Per Cederqvist's avatar
Per Cederqvist committed
535
	log("cached_delete_pers(%d): lock_cnt === %d\n",
536
	    pers, node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
537

538
539
540
    free_person (node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
Per Cederqvist's avatar
Per Cederqvist committed
541
542
543
544
545
546
    return OK;
}

Success
cached_delete_text(Text_no text)
{
547
548
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
549
550
551
552
553
    if ( text == 0 )
    {
	kom_errno = KOM_TEXT_ZERO;
	return FAILURE;
    }
554
555
556
557
558

    node = get_text_node (text);

    if ( text >= next_text_num || node == NULL
	|| node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
559
560
561
562
563
564
565
    {
	log("cached_delete_text(): attempt to"
	    " delete non-existing text %d.\n", text);
	kom_errno = KOM_NO_SUCH_TEXT;
	return FAILURE;
    }

566
    if ( node->lock_cnt > 0 )
Per Cederqvist's avatar
Per Cederqvist committed
567
	log("cached_delete_text(%d): lock_cnt === %d\n",
568
	    text, node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
569
570


571
572
573
    free_text_stat(node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
Per Cederqvist's avatar
Per Cederqvist committed
574
575
576
577
578
579

    return OK;
}


extern Conference *
580
cached_get_conf_stat (Conf_no   conf_no)
Per Cederqvist's avatar
Per Cederqvist committed
581
{
582
583
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
584
585
586
587
588
589
590
    TRACE2("cached_get_conf_stat %d\n", conf_no);

    if ( conf_no == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return NULL;
    }
591
592
593
594

    node = get_conf_node (conf_no);

    if ( conf_no >= next_free_num || node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
595
596
597
598
599
    {
	kom_errno = KOM_UNDEF_CONF;
	return NULL;
    }

600
    if ( node->ptr != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
601
    {
602
	conf_set_mru (conf_no);
603
	++conf_mcb->hits;
604
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
605
606
    }

607
    if ( node->snap_shot != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
608
    {
609
	node->ptr = copy_conf (node->snap_shot);
Per Cederqvist's avatar
Per Cederqvist committed
610
	conf_set_mru (conf_no);
611
	++conf_mcb->hits;
612
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
613
614
    }

615
    node->ptr = read_conference(file_a, node->pos, node->size);
616
    ++conf_mcb->misses;
Per Cederqvist's avatar
Per Cederqvist committed
617
618

    conf_set_mru (conf_no);
619
    return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
620
621
622
623
624
625
626
627
}

/*
 * Return TRUE if conf_no exists.
 */
Bool
cached_conf_exists(Conf_no conf_no)
{
628
629
630
631
632
633
634
635
    Cache_node *node;

    if (conf_no == 0 || conf_no >= next_free_num )
	return FALSE;

    node = get_conf_node (conf_no);

    return node != NULL && node->s.exists != 0;
Per Cederqvist's avatar
Per Cederqvist committed
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
}

    
/*
 * Calls to handle texts
 */

/*
 * +++ Should return Success.
 */
extern String
cached_get_text( Text_no text )
{
    String  the_string;
    Text_stat *t_stat;

    TRACE2("cached_get_text %d\n", text);

    if ( (t_stat = cached_get_text_stat (text)) == NULL )
	return EMPTY_STRING;
    else
    {
	the_string.string = tmp_alloc( t_stat->no_of_chars );
	the_string.len = t_stat->no_of_chars;
	fseek(text_file, t_stat->file_pos, SEEK_SET);

	if ( fread(the_string.string, sizeof(char), the_string.len, text_file)
	    != the_string.len )
	{
	    log("WARNING: cached_get_text: "
		"couldn't read enough characters of text %d\n",
		text);
	    return EMPTY_STRING;
	}
		    
	return the_string;
    }
}


extern Text_stat *	/* NULL on error */
cached_get_text_stat(	Text_no		text )
{
679
680
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
681
682
683
684
685
686
687
688
    TRACE2("cached_get_text_stat(%d);  next_text_num == ", text);
    TRACE2("%d\n", next_text_num);

    if ( text == 0 )
    {
	kom_errno = KOM_TEXT_ZERO;
	return NULL;
    }
689
690
691
692

    node = get_text_node (text);

    if ( text >= next_text_num || node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
693
694
695
696
697
698
    {
	TRACE1("cached_get_text_stat: no such text.\n");
	kom_errno = KOM_NO_SUCH_TEXT;
	return NULL;
    }

699
    if ( node->ptr != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
700
701
702
    {
	TRACE1("Found in ptr.\n");
	text_set_mru( text );
703
	++text_mcb->hits;
704
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
705
706
    }

707
    if ( node->snap_shot != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
708
709
    {
	TRACE1("Found in snap_shot\n");
710
	node->ptr = copy_text_stat(node->snap_shot);
Per Cederqvist's avatar
Per Cederqvist committed
711
	text_set_mru (text);
712
	++text_mcb->hits;
713
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
714
715
716
    }

    TRACE1("Found in file A.\n");
717
    node->ptr = read_text_stat(file_a, node->pos, node->size);
Per Cederqvist's avatar
Per Cederqvist committed
718
719

    text_set_mru (text);
720
    ++text_mcb->misses;
721
    return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
722
723
724
725
726
727
728
729
730
731
732
733
734
}



/*
 * The text is set up with an empty misc-field. The misc field is
 * than initialized by create_text.
 */

extern Text_no
cached_create_text( String message)
{
    Text_no tno;
735
    Cache_node *node;
Per Cederqvist's avatar
Per Cederqvist committed
736
737
738
739
740
741
742
743
744
745
746
747
748

    tno = next_text_num++;

    TRACE2("cached_create_text (len=%d)\n", message.len);

    if ( tno >= MAX_TEXT )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	next_text_num = MAX_TEXT;
	
	return 0;
    }

749
750
    create_cache_node(text_mcb, tno);
    node = get_text_node (tno);
Per Cederqvist's avatar
Per Cederqvist committed
751

752
753
754
755
756
757
758
759
760
761
762
    if ( node == NULL )
	restart_kom("cached_create_text(): could'nt create cache-node.\n");
    
    node->s.exists = 1;
    node->s.dirty = 1;
    node->ptr = alloc_text_stat();
    ((Text_stat *)node->ptr)->no_of_misc = 0;
    ((Text_stat *)node->ptr)->misc_items = NULL;
    ((Text_stat *)node->ptr)->no_of_marks = 0;
    ((Text_stat *)node->ptr)->no_of_lines = 0;
    ((Text_stat *)node->ptr)->no_of_chars = 0;
Per Cederqvist's avatar
Per Cederqvist committed
763
    fseek(text_file, 0, SEEK_END);
764
    ((Text_stat *)node->ptr)->file_pos = ftell(text_file);
Per Cederqvist's avatar
Per Cederqvist committed
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784

    text_set_mru( tno );

    if ( fwrite(message.string, sizeof(char), message.len, text_file)
	!= message.len ) {
	log("WARNING: cached_create_text: Couldn't write the text %d\n",
	    tno);
    }

    fflush(text_file);
    
    TRACE2("cached_create_text -> %d\n", tno);
    
    return tno;
}


Text_no
traverse_text(Text_no seed)
{
785
786
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
787
788
    seed++;
    
789
    while ( seed < next_text_num )
Per Cederqvist's avatar
Per Cederqvist committed
790
    {
791
792
793
794
	node = get_text_node (seed);
	if ( node != NULL && node->s.exists != 0 )
	    break;

Per Cederqvist's avatar
Per Cederqvist committed
795
796
797
798
799
800
801
802
803
	seed++;
    }
    
    return (seed >= next_text_num) ? 0 : seed ;
}

Pers_no
traverse_person(Pers_no seed)
{
804
805
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
806
807
    seed++;

808
    while ( seed < next_free_num )
Per Cederqvist's avatar
Per Cederqvist committed
809
    {
810
811
812
813
	node = get_pers_node (seed);
	if (node != NULL && node->s.exists != 0 )
	    break;

Per Cederqvist's avatar
Per Cederqvist committed
814
815
816
817
818
819
820
821
822
	seed++;
    }

    return (seed >= next_free_num) ? 0 : seed ;
}

Conf_no
traverse_conference(Conf_no seed)
{
823
824
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
825
826
    seed++;
    
827
    while ( seed < next_free_num )
Per Cederqvist's avatar
Per Cederqvist committed
828
    {
829
830
831
832
	node = get_conf_node (seed);
	if (node != NULL && node->s.exists != 0 )
	    break;

Per Cederqvist's avatar
Per Cederqvist committed
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
	seed++;
    }

    return (seed >= next_free_num) ? 0 : seed ;
}

extern Garb_nice
cached_get_garb_nice (Conf_no conf_no)
{
    return small_conf_arr [ conf_no ]->nice;
}


extern Local_text_no
cached_get_highest_local_no (Conf_no conf_no)
{
    return small_conf_arr[ conf_no ]->highest_local_no;
}

/* Lock a person struct in memory. Increase a referenc count. */
void
cached_lock_person(Pers_no pers_no)
{
856
857
858
859
860
    Cache_node *node;

    node = get_pers_node(pers_no);
    
    if ( node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
861
862
	restart_kom("cached_lock_person(%d): nonexistent.\n", pers_no);

863
    if ( node->ptr == NULL )
Per Cederqvist's avatar
Per Cederqvist committed
864
    {
865
	Person *pers_stat_ptr;
Per Cederqvist's avatar
Per Cederqvist committed
866

867
	pers_stat_ptr = cached_get_person_stat( pers_no );
Per Cederqvist's avatar
Per Cederqvist committed
868

869
	if ( pers_stat_ptr == NULL )
Per Cederqvist's avatar
Per Cederqvist committed
870
871
872
	    restart_kom("cached_lock_person(%d): couldn't read in person.\n",
			pers_no);

873
874
875
876
	if ( pers_stat_ptr != node->ptr )
	    restart_kom("cached_lock_person(%d): pers_stat_ptr == %d, node"
			"->ptr == %d.\n", pers_no, pers_stat_ptr,
			node->ptr);
Per Cederqvist's avatar
Per Cederqvist committed
877
878
    }

879
    node->lock_cnt++;
Per Cederqvist's avatar
Per Cederqvist committed
880
881
882
883
884
885
}

/* Decrease reference count. If zero, unlock person. */
void
cached_unlock_person(Pers_no pers_no)
{
886
887
888
889
890
891
892
893
    Cache_node *node;

    node = get_pers_node (pers_no);

    if ( node == NULL )
	restart_kom("cached_unlock_person(): couldn't get cache-node.\n");

    if ( node->lock_cnt <= 0 )
Per Cederqvist's avatar
Per Cederqvist committed
894
895
    {
	log("cached_unlock_person(%d): lock_cnt == %d.\n",
896
	    pers_no, node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
897

898
	node->lock_cnt = 0;
Per Cederqvist's avatar
Per Cederqvist committed
899
900
    }
    else
901
	node->lock_cnt--;
Per Cederqvist's avatar
Per Cederqvist committed
902
903
904
905
906
907
908
}


/* Lock a conf struct in memory. Increase a referenc count. */
void
cached_lock_conf(Conf_no conf_no)
{
909
910
911
912
913
914
915
916
    Cache_node *node;

    node = get_conf_node(conf_no);

    if ( node == NULL)
	restart_kom("cached_lock_conf(): can't get cache-node.\n");

    if ( node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
917
918
	restart_kom("cached_lock_conf(%d): nonexistent.\n", conf_no);

919
    if ( node->ptr == NULL )
Per Cederqvist's avatar
Per Cederqvist committed
920
    {
921
	Conference *conference_ptr;
Per Cederqvist's avatar
Per Cederqvist committed
922

923
	conference_ptr = cached_get_conf_stat( conf_no );
Per Cederqvist's avatar
Per Cederqvist committed
924

925
	if ( conference_ptr == NULL )
Per Cederqvist's avatar
Per Cederqvist committed
926
927
928
	    restart_kom("cached_lock_conf(%d): couldn't read in conf.\n",
			conf_no);

929
930
931
932
	if ( conference_ptr != node->ptr )
	    restart_kom("cached_lock_conf(%d): conference_ptr == %d, node"
			"->ptr == %d.\n", conf_no, conference_ptr,
			node->ptr);
Per Cederqvist's avatar
Per Cederqvist committed
933
934
    }

935
    node->lock_cnt++;
Per Cederqvist's avatar
Per Cederqvist committed
936
937
938
939
940
941
}

/* Decrease reference count. If zero, unlock conf. */
void
cached_unlock_conf(Conf_no conf_no)
{
942
943
944
945
946
947
948
    Cache_node *node;

    node = get_conf_node(conf_no);
    if ( node == NULL )
	restart_kom("cached_unlock_conf(): can't get node.\n");

    if ( node->lock_cnt <= 0 )
Per Cederqvist's avatar
Per Cederqvist committed
949
950
    {
	log("cached_unlock_conf(%d): lock_cnt == %d.\n",
951
	    conf_no, node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
952

953
	node->lock_cnt = 0;
Per Cederqvist's avatar
Per Cederqvist committed
954
955
    }
    else
956
	node->lock_cnt--;
Per Cederqvist's avatar
Per Cederqvist committed
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
}



/*
 * And here comes some functions to deal with lookup_names.
 */

/* Free the _contents_ of a match_table. The table itself i _not_ freed. */

static void
free_match_table(Matching_info *match)
{
    if ( match == NULL )
	return;
    
    while ( ! s_empty( match->name ))
    {
	free_tokens( match->tokens );
	/* match->name is not freed since it points into conf_arr[]. */

	++match;
    }
}    

extern Success
build_matching_info(void)
{
    Conf_no i;
    Matching_info *match;
    Conf_no	  *conf;

    free_match_table(match_table);
    
    match_table = srealloc(match_table, next_free_num * sizeof(Matching_info));
    conf_table = srealloc(conf_table, next_free_num * sizeof(Conf_no));

    no_of_match_info = 0;

    match = match_table;
    conf = conf_table;
    
    for ( i = 1; i < next_free_num; i++ )
    {
	if ( small_conf_arr[ i ] != NULL
	    && ! s_empty ( small_conf_arr[ i ]->name ) )
	{
	    match->name = small_conf_arr[ i ]->name;
Per Cederqvist's avatar
Per Cederqvist committed
1005
	    match->tokens = tokenize(match->name, s_fcrea_str(WHITESPACE));
Per Cederqvist's avatar
Per Cederqvist committed
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
	    match->priority = 7;
	    *conf = i;
	    ++match;
	    ++conf;
	    ++no_of_match_info;
	}
    }

    match->name = EMPTY_STRING;
    match->tokens = NULL;
    match->priority = 0;
    *conf = 0;
    
    return OK;
}



/* Map conference name to number */
extern Success
cached_lookup_name(const String name,
		   Conf_list_old *result)
{
    Parse_info tmp;
    int i;
    
    tmp = parse(name, match_table, FALSE, FALSE,
Per Cederqvist's avatar
Per Cederqvist committed
1033
		s_fcrea_str(WHITESPACE), DEFAULT_COLLAT_TAB);
Per Cederqvist's avatar
Per Cederqvist committed
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109

    if ( tmp.no_of_matches == -1 )
	return FAILURE;
    
    if ( tmp.no_of_matches == 1 && tmp.indexes[ 0 ] == -1 )
    {
	/* Return the entire list. */
	result->no_of_conf_nos = no_of_match_info;
	result->conf_nos = tmp_alloc(no_of_match_info * sizeof(Conf_no));
	result->type_of_conf = tmp_alloc(no_of_match_info * sizeof(Conf_type));

	for ( i = 0; i < no_of_match_info; i++ )
	{
	    result->conf_nos[ i ] = conf_table[ i ];
	    result->type_of_conf[ i ] = small_conf_arr[ conf_table[i] ]->type;
	}
    }
    else
    {
	/* Return the conferences whose conf_nos are in indexes[]. */
	result->no_of_conf_nos = tmp.no_of_matches;
	result->conf_nos = tmp_alloc(tmp.no_of_matches * sizeof(Conf_no));
	result->type_of_conf = tmp_alloc(tmp.no_of_matches
					 * sizeof(Conf_type));

	for ( i = 0; i < tmp.no_of_matches; i++ )
	{
	    result->conf_nos[ i ] = conf_table[ tmp.indexes[ i ] ];
	    result->type_of_conf[ i ]
		= small_conf_arr[ conf_table[ tmp.indexes[ i ] ] ]->type;
	}
    }		
    sfree(tmp.indexes);
    return OK;
}


static Bool
is_clean(const char *fn)
{
    FILE *fp;

    if ( (fp = fopen(fn, "rb")) == NULL )
	return FALSE;

    if ( getc(fp) == 'C' && getc(fp) == 'L' && getc(fp) == 'E'
	&& getc(fp) == 'A' && getc(fp) == 'N' )
    {
	fclose(fp);
	return TRUE;
    }
    else
    {
	fclose(fp);
	return FALSE;
    }
}


extern void
pre_sync(void)
{
    long i;
    Cache_node *node;

    async_sync_db();

    /* Mark up what to save.*/

    BUG(("Sync starting\n"));

    highest_text_no = next_text_num;
    highest_conf_no = next_free_num;

    for ( i = 1; i < highest_conf_no; i++ )
    {
1110
	node = get_conf_node(i);
Per Cederqvist's avatar
Per Cederqvist committed
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121

	if ( node != NULL )
	{
	    node->s.exists_b = node->s.exists;

	    if ( node->s.dirty != 0 && node->s.exists != 0)
	    {
		free_conference(node->snap_shot);

		if ( node->lock_cnt == 0 )
		{
1122
		    unlink_conf_lru(node);
Per Cederqvist's avatar
Per Cederqvist committed
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
		    node->snap_shot = node->ptr;
		    node->ptr = NULL;
		}
		else
		{
		    node->snap_shot = copy_conf(node->ptr);
		}
		
		node->s.dirty = 0;
	    }
	}
    }

    for ( i = 1; i < highest_conf_no; i++ )
    {
1138
	node = get_pers_node(i);
Per Cederqvist's avatar
Per Cederqvist committed
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149

	if ( node != NULL )
	{
	    node->s.exists_b = node->s.exists;

	    if ( node->s.dirty != 0 && node->s.exists != 0)
	    {
		free_person(node->snap_shot);

		if ( node->lock_cnt == 0 )
		{
1150
		    unlink_pers_lru(node);
Per Cederqvist's avatar
Per Cederqvist committed
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
		    node->snap_shot = node->ptr;
		    node->ptr = NULL;
		}
		else
		{
		    node->snap_shot
			= copy_person(node->ptr);
		}
		
		node->s.dirty = 0;
	    }
	}
    }

    for ( i = 1; i < highest_text_no; i++ )
    {
1167
	node = get_text_node(i);
Per Cederqvist's avatar
Per Cederqvist committed
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178

	if ( node != NULL )
	{
	    node->s.exists_b = node->s.exists;

	    if ( node->s.dirty != 0 && node->s.exists != 0)
	    {
		free_text_stat(node->snap_shot);

		if ( node->lock_cnt == 0 )
		{
1179
		    unlink_text_lru(node);
Per Cederqvist's avatar
Per Cederqvist committed
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
		    node->snap_shot = node->ptr;
		    node->ptr = NULL;
		}
		else
		{
		    node->snap_shot
			= copy_text_stat(node->ptr);
		}
		
		node->s.dirty = 0;
	    }
	}
    }

    /* All marking is done. Now open file B. */
    
    if ( is_clean(datafilename) )
    {
	if ( rename(datafilename, backupfilename) != 0 )
	    restart_kom("pre_sync: can't backup.\n");
    }
    else
	log("pre_sync: datafile not clean. No backup taken.\n");
1203
1204
1205
1206
1207
1208

    if ( file_b != NULL )
    {
	log("pre_sync: Save in progress aborted.\n");
	fclose(file_b);
    }
Per Cederqvist's avatar
Per Cederqvist committed
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238

    if ( (file_b=fopen(datafilename, "wb") ) == NULL )
    {
	log("WARNING: pre_sync: can't open file to save in.\n");
	sync_state = sync_wait;

	return;
    }

    fprintf(file_b, "DIRTY\n");		 /* DIRTY-FLAG */

    fprintf(file_b, "%d\n", highest_conf_no);	  /* NEXT_FREE_NUM */
    sync_state = sync_save_conf;
    sync_next = 1;
}

static void
copy_file(FILE *from,
	  FILE *to,
	  long from_pos,
	  long len)
{
    char *buf;
    long result;

    buf = smalloc(len);
    if ( fseek(from, from_pos, SEEK_SET) == -1 )
    {
	sync_state = sync_error;
	log("sync: copy_file(): fseek failed.\n");
1239
	sfree(buf);
Per Cederqvist's avatar
Per Cederqvist committed
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
	return;
    }
    
    if ( (result = fread(buf, 1, len, from)) != len )
    {
	log("sync: copy_file(): fread failed.\n"
	    "from_pos = %d, len = %d, result = %d\n",
	    from_pos, len, result);

	sync_state = sync_error;
1250
	sfree(buf);
Per Cederqvist's avatar
Per Cederqvist committed
1251
1252
1253
1254
1255
1256
1257
	return;
    }

    if ( fseek(to, 0, SEEK_END) == -1 )
    {
	sync_state = sync_error;
	log("sync: copy_file(): second fseek failed.\n");
1258
	sfree(buf);
Per Cederqvist's avatar
Per Cederqvist committed
1259
1260
1261
1262
1263
1264
1265
	return;
    }

    if ( fwrite(buf, 1, len, to) != len )
    {
	sync_state = sync_error;
	log("sync: copy_file(): fwrite failed.\n");
1266
	sfree(buf);
Per Cederqvist's avatar
Per Cederqvist committed
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
	return;
    }

    sfree(buf);
}    

static void
save_one_conf(void)
{
    Cache_node *cn;
    
    if (sync_next < highest_conf_no)
    {
1280
	cn = get_conf_node (sync_next);
Per Cederqvist's avatar
Per Cederqvist committed
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335

	if ( cn == NULL )
	{
	    putc('@', file_b);
	    putc('\n', file_b);
	}
	else 
	{
	    cn->pos_b = ftell(file_b);

	    if ( cn->s.exists_b == 0 )
		putc('@', file_b);
	    else if ( cn->snap_shot != NULL )
	    {
		fprintf(file_b, "+ ");
		foutput_conference(file_b, cn->snap_shot);
	    }
	    else if ( cn->s.dirty == 0 && cn->ptr != NULL )
	    {
		fprintf(file_b, "+ ");
		foutput_conference(file_b, cn->ptr);
	    }
	    else
	    {
		copy_file(file_a, file_b, cn->pos, cn->size - 1);
	    }

	    putc('\n', file_b);
	    cn->size_b = ftell(file_b) - cn->pos_b;
	}
	sync_next++;
    }
    else			/* All conferences are written. */
    {
	sync_next = 1;
	sync_state = sync_save_pers;
    }
}

static void
write_pers(FILE *fp,
	   Person *p)
{
    fprintf(fp, "+ %dH", PASSWD_LEN);
    fwrite(p->pwd, PASSWD_LEN, 1, fp);
    foutput_person(fp, p);
}

static void
save_one_pers(void)
{
    Cache_node *cn;
    
    if (sync_next < highest_conf_no)
    {
1336
	cn = get_pers_node (sync_next);
Per Cederqvist's avatar
Per Cederqvist committed
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397

	if ( cn == NULL )
	{
	    putc('@', file_b);
	    putc('\n', file_b);
	}
	else 
	{
	    cn->pos_b = ftell(file_b);

	    if ( cn->s.exists_b == 0 )
		putc('@', file_b);
	    else if ( cn->snap_shot != NULL )
	    {
		write_pers(file_b, cn->snap_shot);
	    }
	    else if ( cn->s.dirty == 0 && cn->ptr != NULL )
	    {
		write_pers(file_b, cn->ptr);
	    }
	    else
	    {
		copy_file(file_a, file_b, cn->pos, cn->size - 1);
	    }

	    putc('\n', file_b);
	    cn->size_b = ftell(file_b) - cn->pos_b;
	}
	sync_next++;
    }
    else			/* All persons are written. */
    {
	fprintf(file_b, "%d\n", highest_text_no);	/* NEXT_TEXT_NUM */
	sync_next = 1;
	sync_state = sync_save_text;
    }
}

static void
post_sync(void)
{
    int i;
    Cache_node *node;

    async_sync_db();

    if ( file_a == NULL )
	log("WARNING: post_sync(): file_a == NULL. This is only normal "
	    "if this is the first sync ever on this data file.\n");
    else
	fclose(file_a);

    if ( ( file_a = fopen(datafilename, "rb") ) == NULL )
    {
	log("post_sync: can't open the file I just saved.\n");
	sync_state = sync_wait;
	return;
    }

    for ( i = 1; i < highest_conf_no; i++ )
    {
1398
	node = get_conf_node(i);
Per Cederqvist's avatar
Per Cederqvist committed
1399
1400
1401
1402
1403
1404
	if ( node != NULL )
	{
	    node->pos = node->pos_b;
	    node->size = node->size_b;
	    free_conference(node->snap_shot);
	    node->snap_shot = NULL;
1405
	    /* +++ Delete if it no longer exists. */
Per Cederqvist's avatar
Per Cederqvist committed
1406
1407
1408
1409
1410
	}
    }

    for ( i = 1; i < highest_conf_no; i++ )
    {
1411
	node = get_pers_node(i);
Per Cederqvist's avatar
Per Cederqvist committed
1412
1413
1414
1415
1416
1417
	if ( node != NULL )
	{
	    node->pos = node->pos_b;
	    node->size = node->size_b;
	    free_person(node->snap_shot);
	    node->snap_shot = NULL;
1418
	    /* +++ Delete if it no longer exists. */
Per Cederqvist's avatar
Per Cederqvist committed
1419
1420
1421
1422
1423
	}
    }

    for ( i = 1; i < highest_text_no; i++ )
    {
1424
	node = get_text_node(i);
Per Cederqvist's avatar
Per Cederqvist committed
1425
1426
1427
1428
1429
1430
	if ( node != NULL )
	{
	    node->pos = node->pos_b;
	    node->size = node->size_b;
	    free_text_stat(node->snap_shot);
	    node->snap_shot = NULL;
1431
	    /* +++ Delete if it no longer exists. */
Per Cederqvist's avatar
Per Cederqvist committed
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
	}
    }
}

    

static void
save_one_text(void)
{
    Cache_node *cn;
    
    if (sync_next < highest_text_no)
    {
1445
	cn = get_text_node(sync_next);
Per Cederqvist's avatar
Per Cederqvist committed
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481

	if ( cn == NULL )
	{
	    putc('@', file_b);
	    putc('\n', file_b);
	}
	else 
	{
	    cn->pos_b = ftell(file_b);

	    if ( cn->s.exists_b == 0 )
		putc('@', file_b);
	    else if ( cn->snap_shot != NULL )
	    {
		fprintf(file_b, "+ ");
		foutput_text_stat(file_b, cn->snap_shot);
	    }
	    else if ( cn->s.dirty == 0 && cn->ptr != NULL )
	    {
		fprintf(file_b, "+ ");
		foutput_text_stat(file_b, cn->ptr);
	    }
	    else
	    {
		copy_file(file_a, file_b, cn->pos, cn->size - 1);
	    }

	    putc('\n', file_b);
	    cn->size_b = ftell(file_b) - cn->pos_b;
	}
	sync_next++;
    }
    else			/* All texts are written. */
    {
	if ( ferror(file_b) != 0 )
	{
1482
	    log ("save_one_text(): ferror() detected.\n");
Per Cederqvist's avatar
Per Cederqvist committed
1483
1484
1485
1486
1487
1488
1489
	    sync_state = sync_error;
	    return;
	}
	
	rewind(file_b);
	if ( ferror(file_b)  != 0 )
	{
1490
	    log ("save_one_text(): rewind failed.\n");
Per Cederqvist's avatar
Per Cederqvist committed
1491
1492
1493
1494
1495
1496
1497
	    sync_state = sync_error;
	    return;
	}
	
	fprintf(file_b, "CLEAN");
	if ( ferror(file_b)  != 0 )
	{
1498
	    log ("save_one_text(): fprintf(CLEAN) failed.\n");
Per Cederqvist's avatar
Per Cederqvist committed
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
	    sync_state = sync_error;
	    return;
	}
	
	if ( fclose(file_b) != 0 )
	{
	    file_b = NULL;

	    log("Sync: fclose() failed in save_one_text. Deleting "
		"file and retrying.\n");
	    remove(datafilename);
	    sync_state = sync_wait;
	    return;
	}

1514
1515
	file_b = NULL;

Per Cederqvist's avatar
Per Cederqvist committed
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
	sync_state = sync_ready;

	BUG(("Sync ready\n"));
	post_sync();
    }
}

/*
 * Sync_part() should be called often as long as it returns FALSE.
 * Sync_part() returns TRUE when everything is written to a file.
 * Sync_part() should be called once in a while even when it returns
 * TRUE (because sync() checks to see if it is time to start yet
 * another save.)
 */
EXPORT Bool
sync_part(void)
{
    static time_t last_sync_start = NO_TIME;

    if ( last_sync_start == NO_TIME )
    {
	last_sync_start = time(NULL);
	sync_state = sync_ready;
    }

    switch(sync_state)
    {
    case sync_save_conf:
	save_one_conf();
	break;

    case sync_save_pers:
	save_one_pers();
	break;

    case sync_save_text:
	save_one_text();
	break;

    case sync_ready:
	if ( difftime(time(NULL), last_sync_start) < 60 * SYNC_INTERVAL )
	    return TRUE;

	last_sync_start = time(NULL);
    
	pre_sync();
	break;

    case sync_wait:
	if ( difftime(time(NULL), last_sync_start) < 60 * SYNC_RETRY_INTERVAL )
	    return TRUE;

	last_sync_start = time(NULL);

	pre_sync();
	break;

    case sync_error:
	log("sync: Error saving new file. Discarding file and "
	    "trying again.\n");
	fclose(file_b);
	file_b = NULL;
	remove(datafilename);
	sync_state = sync_wait;
	break;

    default:
	restart_kom("sync(): sync_state==%d", sync_state);
    }

1586
    if ( file_b != NULL && ferror(file_b) != 0)
Per Cederqvist's avatar
Per Cederqvist committed
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
	sync_state = sync_error;

    return FALSE;
}


static void
setup_small_conf(Conf_no conf_no,
		 Conference *conf_c)
{
    small_conf_arr[ conf_no ] = alloc_small_conf();
    s_strcpy(&small_conf_arr[ conf_no ]->name, conf_c->name);
    small_conf_arr[ conf_no ]->type = conf_c->type;
    small_conf_arr[ conf_no ]->highest_local_no
	= (conf_c->texts.first_local_no - 1
	   + conf_c->texts.no_of_texts );
    small_conf_arr[ conf_no ]->nice = conf_c->nice;
}


    
extern Success
init_cache(void)
{
    int i;
    Cache_node *node;
    Conference tmp_conf = EMPTY_CONFERENCE;
    Person tmp_pers = EMPTY_PERSON;
    Text_stat tmp_text = EMPTY_TEXT_STAT;

1617
1618
1619
1620
1621
1622
    pers_mcb = create_cache_node_mcb(100, MAX_CONF);
    conf_mcb = create_cache_node_mcb(100, MAX_CONF);
    text_mcb = create_cache_node_mcb(100, MAX_TEXT);



Per Cederqvist's avatar
Per Cederqvist committed
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
    if ( (text_file = fopen(textfilename, "a+b")) == NULL )
    {
	restart_kom("ERROR: init_cache: can't open text file.\n");
    }

    if ( is_clean(datafilename) )
    {
	if ( (file_a = fopen(datafilename, "rb")) == NULL )
	{
	    log("WARNING: init_cache: can't open datafile.\n");
	    return FAILURE;
	}
	log("MSG: init_cache: using datafile.\n");
    }
    else if ( is_clean(backupfilename) )
    {
	if ( (file_a = fopen(backupfilename, "rb")) == NULL )
	{
	    log("WARNING: init_cache: can't open backupfile.\n");
	    return FAILURE;
	}
	log("MSG: init_cache: using backup file.\n");
    }
    else
    {
	log("WARNING: init_cache: can't find old data base.\n");
	return FAILURE;
    }
        
    fseek(file_a, 6, SEEK_SET);	/* skip clean/dirty flag. */

    next_free_num = fparse_long(file_a);	  /* NEXT_FREE_NUM */

    for ( i = 1; i < next_free_num; i++ ) /* CONFS */
    {
	fskipwhite(file_a);
	switch(getc(file_a))
	{
	case '@':
1662
	    zero_init_cache_node(conf_mcb, i);
Per Cederqvist's avatar
Per Cederqvist committed
1663
1664
1665
	    break;

	case '+':
1666
1667
	    create_cache_node(conf_mcb, i);
	    node = get_conf_node(i);
Per Cederqvist's avatar