summaryrefslogblamecommitdiff
path: root/src/common/db.c
blob: d76b7a44c2be746cb708a94f41de5ad2374a81ef (plain) (tree)
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







                                                      
                   
































































































































































































































































































































































































































                                                                                                   
                 
















                                                                       





                                                                                                           
















































                                                                     
                                 



                             
                     

                   
// $Id: db.c,v 1.2 2004/09/23 14:43:06 MouseJstr Exp $
// #define MALLOC_DBN
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "db.h"
#include "mmo.h"
#include "utils.h"
#include "malloc.h"

#ifdef MEMWATCH
#include "memwatch.h"
#endif

#define ROOT_SIZE 4096
#ifdef MALLOC_DBN
static struct dbn *dbn_root[512], *dbn_free;
static int dbn_root_rest=0,dbn_root_num=0;

static void * malloc_dbn(void)
{
	struct dbn* ret;

	if(dbn_free==NULL){
		if(dbn_root_rest<=0){
			CREATE(dbn_root[dbn_root_num], struct dbn, ROOT_SIZE);

			dbn_root_rest=ROOT_SIZE;
			dbn_root_num++;
		}
		return &(dbn_root[dbn_root_num-1][--dbn_root_rest]);
	}
	ret=dbn_free;
	dbn_free = dbn_free->parent;
	return ret;
}

static void free_dbn(struct dbn* add_dbn)
{
	add_dbn->parent = dbn_free;
	dbn_free = add_dbn;
}
#endif

static int strdb_cmp(struct dbt* table,void* a,void* b)
{
	if(table->maxlen)
		return strncmp(a,b,table->maxlen);
	return strcmp(a,b);
}

static unsigned int strdb_hash(struct dbt* table,void* a)
{
	int i;
	unsigned int h;
	unsigned char *p=a;

	i=table->maxlen;
	if(i==0) i=0x7fffffff;
	for(h=0;*p && --i>=0;){
		h=(h*33 + *p++) ^ (h>>24);
	}
	return h;
}

struct dbt* strdb_init(int maxlen)
{
	int i;
	struct dbt* table;

	CREATE(table, struct dbt, 1);

	table->cmp=strdb_cmp;
	table->hash=strdb_hash;
	table->maxlen=maxlen;
	for(i=0;i<HASH_SIZE;i++)
		table->ht[i]=NULL;
	return table;
}

static int numdb_cmp(struct dbt* table,void* a,void* b)
{
	int ia,ib;

	ia=(int)a;
	ib=(int)b;

	if((ia^ib) & 0x80000000)
		return ia<0 ? -1 : 1;

	return ia-ib;
}

static unsigned int numdb_hash(struct dbt* table,void* a)
{
	return (unsigned int)a;
}

struct dbt* numdb_init(void)
{
	int i;
	struct dbt* table;

	CREATE(table, struct dbt, 1);

	table->cmp=numdb_cmp;
	table->hash=numdb_hash;
	table->maxlen=sizeof(int);
	for(i=0;i<HASH_SIZE;i++)
		table->ht[i]=NULL;
	return table;
}

void* db_search(struct dbt *table,void* key)
{
	struct dbn *p;

	for(p=table->ht[table->hash(table,key) % HASH_SIZE];p;){
		int c=table->cmp(table,key,p->key);
		if(c==0)
			return p->data;
		if(c<0)
			p=p->left;
		else
			p=p->right;
	}
	return NULL;
}

void * db_search2(struct dbt *table, const char *key)
{
	int i,sp;
	struct dbn *p,*pn,*stack[64];
        int slen = strlen(key);

	for(i=0;i<HASH_SIZE;i++){
		if((p=table->ht[i])==NULL)
			continue;
		sp=0;
		while(1){
                        if (strnicmp(key, p->key, slen) == 0)
                           return p->data;
			if((pn=p->left)!=NULL){
				if(p->right){
					stack[sp++]=p->right;
				}
				p=pn;
			} else {
				if(p->right){
					p=p->right;
				} else {
					if(sp==0)
						break;
					p=stack[--sp];
				}
			}
		}
	}
        return 0;
}

static void db_rotate_left(struct dbn *p,struct dbn **root)
{
	struct dbn * y = p->right;
	p->right = y->left;
	if (y->left !=0)
		y->left->parent = p;
	y->parent = p->parent;

	if (p == *root)
		*root = y;
	else if (p == p->parent->left)
		p->parent->left = y;
	else
		p->parent->right = y;
	y->left = p;
	p->parent = y;
}

static void db_rotate_right(struct dbn *p,struct dbn **root)
{
	struct dbn * y = p->left;
	p->left = y->right;
	if (y->right != 0)
		y->right->parent = p;
	y->parent = p->parent;

	if (p == *root)
		*root = y;
	else if (p == p->parent->right)
		p->parent->right = y;
	else
		p->parent->left = y;
	y->right = p;
	p->parent = y;
}

static void db_rebalance(struct dbn *p,struct dbn **root)
{
	p->color = RED;
	while(p!=*root && p->parent->color==RED){ // root�͕K�����Őe�͐Ԃ��̂Őe�̐e�͕K�����݂���
		if (p->parent == p->parent->parent->left) {
			struct dbn *y = p->parent->parent->right;
			if (y && y->color == RED) {
				p->parent->color = BLACK;
				y->color = BLACK;
				p->parent->parent->color = RED;
				p = p->parent->parent;
			} else {
				if (p == p->parent->right) {
					p = p->parent;
					db_rotate_left(p, root);
				}
				p->parent->color = BLACK;
				p->parent->parent->color = RED;
				db_rotate_right(p->parent->parent, root);
			}
		} else {
			struct dbn* y = p->parent->parent->left;
			if (y && y->color == RED) {
				p->parent->color = BLACK;
				y->color = BLACK;
				p->parent->parent->color = RED;
				p = p->parent->parent;
			} else {
				if (p == p->parent->left) {
					p = p->parent;
					db_rotate_right(p, root);
				}
				p->parent->color = BLACK;
				p->parent->parent->color = RED;
				db_rotate_left(p->parent->parent, root);
			}
		}
	}
	(*root)->color=BLACK;
}

static void db_rebalance_erase(struct dbn *z,struct dbn **root)
{
	struct dbn *y = z, *x = NULL, *x_parent = NULL;

	if (y->left == NULL)
		x = y->right;
	else if (y->right == NULL)
		x = y->left;
	else {
		y = y->right;
		while (y->left != NULL)
			y = y->left;
		x = y->right;
	}
	if (y != z) { // ���E���������܂��Ă����� y��z�̈ʒu�Ɏ����Ă���z�𕂂�����
		z->left->parent = y;
		y->left = z->left;
		if (y != z->right) {
			x_parent = y->parent;
			if (x) x->parent = y->parent;
			y->parent->left = x;
			y->right = z->right;
			z->right->parent = y;
		} else
			x_parent = y;
		if (*root == z)
			*root = y;
		else if (z->parent->left == z)
			z->parent->left = y;
		else
			z->parent->right = y;
		y->parent = z->parent;
		{ int tmp=y->color; y->color=z->color; z->color=tmp; }
		y = z;
	} else { // �ǂ��炩�󂢂Ă����ꍇ x��z�̈ʒu�Ɏ����Ă���z�𕂂�����
		x_parent = y->parent;
		if (x) x->parent = y->parent;
		if (*root == z)
			*root = x;
		else if (z->parent->left == z)
			z->parent->left = x;
		else
			z->parent->right = x;
	}
	// �����܂ŐF�̈ړ��̏����Ēʏ��2���؂Ɠ���
	if (y->color != RED) { // �Ԃ������镪�ɂ͉e������
		while (x != *root && (x == NULL || x->color == BLACK))
			if (x == x_parent->left) {
				struct dbn* w = x_parent->right;
				if (w->color == RED) {
					w->color = BLACK;
					x_parent->color = RED;
					db_rotate_left(x_parent, root);
					w = x_parent->right;
				}
				if ((w->left == NULL ||
					 w->left->color == BLACK) &&
					(w->right == NULL ||
					 w->right->color == BLACK)) {
					w->color = RED;
					x = x_parent;
					x_parent = x_parent->parent;
				} else {
					if (w->right == NULL ||
						w->right->color == BLACK) {
						if (w->left) w->left->color = BLACK;
						w->color = RED;
						db_rotate_right(w, root);
						w = x_parent->right;
					}
					w->color = x_parent->color;
					x_parent->color = BLACK;
					if (w->right) w->right->color = BLACK;
					db_rotate_left(x_parent, root);
					break;
				}
			} else {                  // same as above, with right <-> left.
				struct dbn* w = x_parent->left;
				if (w->color == RED) {
					w->color = BLACK;
					x_parent->color = RED;
					db_rotate_right(x_parent, root);
					w = x_parent->left;
				}
				if ((w->right == NULL ||
					 w->right->color == BLACK) &&
					(w->left == NULL ||
					 w->left->color == BLACK)) {
					w->color = RED;
					x = x_parent;
					x_parent = x_parent->parent;
				} else {
					if (w->left == NULL ||
						w->left->color == BLACK) {
						if (w->right) w->right->color = BLACK;
						w->color = RED;
						db_rotate_left(w, root);
						w = x_parent->left;
					}
					w->color = x_parent->color;
					x_parent->color = BLACK;
					if (w->left) w->left->color = BLACK;
					db_rotate_right(x_parent, root);
					break;
				}
			}
		if (x) x->color = BLACK;
	}
}

struct dbn* db_insert(struct dbt *table,void* key,void* data)
{
	struct dbn *p,*priv;
	int c,hash;

	hash = table->hash(table,key) % HASH_SIZE;
	for(c=0,priv=NULL ,p = table->ht[hash];p;){
		c=table->cmp(table,key,p->key);
		if(c==0){ // replace
                        if (table->release)
                            table->release(p, 3);
			p->data=data;
			p->key=key;
			return p;
		}
		priv=p;
		if(c<0){
			p=p->left;
		} else {
			p=p->right;
		}
	}
#ifdef MALLOC_DBN
	p=malloc_dbn();
#else
	CREATE(p, struct dbn, 1);
#endif
	if(p==NULL){
		printf("out of memory : db_insert\n");
		return NULL;
	}
	p->parent= NULL;
	p->left  = NULL;
	p->right = NULL;
	p->key   = key;
	p->data  = data;
	p->color = RED;
	if(c==0){ // hash entry is empty
		table->ht[hash] = p;
		p->color = BLACK;
	} else {
		if(c<0){ // left node
			priv->left = p;
			p->parent=priv;
		} else { // right node
			priv->right = p;
			p->parent=priv;
		}
		if(priv->color==RED){ // must rebalance
			db_rebalance(p,&table->ht[hash]);
		}
	}
	return p;
}

void* db_erase(struct dbt *table,void* key)
{
	void *data;
	struct dbn *p;
	int c,hash;

	hash = table->hash(table,key) % HASH_SIZE;
	for(c=0,p = table->ht[hash];p;){
		c=table->cmp(table,key,p->key);
		if(c==0)
			break;
		if(c<0)
			p=p->left;
		else
			p=p->right;
	}
	if(!p)
		return NULL;
	data=p->data;
	db_rebalance_erase(p,&table->ht[hash]);
#ifdef MALLOC_DBN
	free_dbn(p);
#else
	aFree(p);
#endif
	return data;
}

void db_foreach(struct dbt *table,int (*func)(void*,void*,va_list),...)
{
	int i,sp;
	// red-black tree�Ȃ̂�64��stack�������2^32�ƒm�[�h�܂ő��v
	struct dbn *p,*pn,*stack[64];
	va_list ap;

	va_start(ap,func);
	for(i=0;i<HASH_SIZE;i++){
		if((p=table->ht[i])==NULL)
			continue;
		sp=0;
		while(1){
			//reverted it back. sorry that brought thios bug from Freya [Lupus]
			//if (!p->data) {
			//	printf("Warning: no data for key %d in db_foreach (db.c) !\n",(int)p->key);
			//} else {
			func(p->key, p->data, ap);
			//}
			if((pn=p->left)!=NULL){
				if(p->right){
					stack[sp++]=p->right;
				}
				p=pn;
			} else {
				if(p->right){
					p=p->right;
				} else {
					if(sp==0)
						break;
					p=stack[--sp];
				}
			}
		}
	}
	va_end(ap);
}

void db_final(struct dbt *table,int (*func)(void*,void*,va_list),...)
{
	int i,sp;
	struct dbn *p,*pn,*stack[64];
	va_list ap;

	va_start(ap,func);
	for(i=0;i<HASH_SIZE;i++){
		if((p=table->ht[i])==NULL)
			continue;
		sp=0;
		while(1){
			if(func)
				func(p->key,p->data,ap);
			if((pn=p->left)!=NULL){
				if(p->right){
					stack[sp++]=p->right;
				}
			} else {
				if(p->right){
					pn=p->right;
				} else {
					if(sp==0)
						break;
					pn=stack[--sp];
				}
			}
#ifdef MALLOC_DBN
			free_dbn(p);
#else
			aFree(p);
#endif
			p=pn;
		}
	}
	aFree(table);
	va_end(ap);
}