summaryrefslogtreecommitdiffstats
path: root/src/vty/vector.c
blob: c5a99af37cb2b12f65f07016265ed74ef64fed29 (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
/* Generic vector interface routine
 * Copyright (C) 1997 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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, or (at your option) any
 * later version.
 *
 * GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

#include <stdlib.h>
#include <unistd.h>

#include <osmocom/vty/vector.h>
#include <osmocom/vty/vty.h>
#include <osmocom/core/talloc.h>
#include <string.h>

void *tall_vty_vec_ctx;

/* Initialize vector : allocate memory and return vector. */
vector vector_init(unsigned int size)
{
	vector v = talloc_zero(tall_vty_vec_ctx, struct _vector);
	if (!v)
		return NULL;

	/* allocate at least one slot */
	if (size == 0)
		size = 1;

	v->alloced = size;
	v->active = 0;
	v->index = _talloc_zero(tall_vty_vec_ctx, sizeof(void *) * size,
				"vector_init:index");
	if (!v->index) {
		talloc_free(v);
		return NULL;
	}
	return v;
}

void vector_only_wrapper_free(vector v)
{
	talloc_free(v);
}

void vector_only_index_free(void *index)
{
	talloc_free(index);
}

void vector_free(vector v)
{
	talloc_free(v->index);
	talloc_free(v);
}

vector vector_copy(vector v)
{
	unsigned int size;
	vector new = talloc_zero(tall_vty_vec_ctx, struct _vector);
	if (!new)
		return NULL;

	new->active = v->active;
	new->alloced = v->alloced;

	size = sizeof(void *) * (v->alloced);
	new->index = _talloc_zero(tall_vty_vec_ctx, size, "vector_copy:index");
	if (!new->index) {
		talloc_free(new);
		return NULL;
	}
	memcpy(new->index, v->index, size);

	return new;
}

/* Check assigned index, and if it runs short double index pointer */
void vector_ensure(vector v, unsigned int num)
{
	if (v->alloced > num)
		return;

	v->index = talloc_realloc_size(tall_vty_vec_ctx, v->index,
				       sizeof(void *) * (v->alloced * 2));
	memset(&v->index[v->alloced], 0, sizeof(void *) * v->alloced);
	v->alloced *= 2;

	if (v->alloced <= num)
		vector_ensure(v, num);
}

/* This function only returns next empty slot index.  It dose not mean
   the slot's index memory is assigned, please call vector_ensure()
   after calling this function. */
int vector_empty_slot(vector v)
{
	unsigned int i;

	if (v->active == 0)
		return 0;

	for (i = 0; i < v->active; i++)
		if (v->index[i] == 0)
			return i;

	return i;
}

/* Set value to the smallest empty slot. */
int vector_set(vector v, void *val)
{
	unsigned int i;

	i = vector_empty_slot(v);
	vector_ensure(v, i);

	v->index[i] = val;

	if (v->active <= i)
		v->active = i + 1;

	return i;
}

/* Set value to specified index slot. */
int vector_set_index(vector v, unsigned int i, void *val)
{
	vector_ensure(v, i);

	v->index[i] = val;

	if (v->active <= i)
		v->active = i + 1;

	return i;
}

/* Look up vector.  */
void *vector_lookup(vector v, unsigned int i)
{
	if (i >= v->active)
		return NULL;
	return v->index[i];
}

/* Lookup vector, ensure it. */
void *vector_lookup_ensure(vector v, unsigned int i)
{
	vector_ensure(v, i);
	return v->index[i];
}

/* Unset value at specified index slot. */
void vector_unset(vector v, unsigned int i)
{
	if (i >= v->alloced)
		return;

	v->index[i] = NULL;

	if (i + 1 == v->active) {
		v->active--;
		while (i && v->index[--i] == NULL && v->active--) ;	/* Is this ugly ? */
	}
}

/* Count the number of not emplty slot. */
unsigned int vector_count(vector v)
{
	unsigned int i;
	unsigned count = 0;

	for (i = 0; i < v->active; i++)
		if (v->index[i] != NULL)
			count++;

	return count;
}