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
|
/**
* mds — A micro-display server
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "client-list.h"
#include "macros.h"
#include <string.h>
#include <errno.h>
/**
* The default initial capacity
*/
#ifndef CLIENT_LIST_DEFAULT_INITIAL_CAPACITY
#define CLIENT_LIST_DEFAULT_INITIAL_CAPACITY 8
#endif
/**
* Computes the nearest, but higher, power of two,
* but only if the current value is not a power of two
*
* @param value The value to be rounded up to a power of two
* @return The nearest, but not smaller, power of two
*/
static size_t to_power_of_two(size_t value)
{
value -= 1;
value |= value >> 1;
value |= value >> 2;
value |= value >> 4;
value |= value >> 8;
value |= value >> 16;
#if __WORDSIZE == 64
value |= value >> 32;
#endif
return value + 1;
}
/**
* Create a client list
*
* @param this Memory slot in which to store the new client list
* @param capacity The minimum initial capacity of the client list, 0 for default
* @return Non-zero on error, `errno` will have been set accordingly
*/
int client_list_create(client_list_t* restrict this, size_t capacity)
{
/* Use default capacity of zero is specified. */
if (capacity == 0)
capacity = CLIENT_LIST_DEFAULT_INITIAL_CAPACITY;
/* Initialise the client list. */
this->capacity = capacity = to_power_of_two(capacity);
this->size = 0;
this->clients = NULL;
if (xmalloc(this->clients, capacity, uint64_t))
return -1;
return 0;
}
/**
* Release all resources in a client list, should
* be done even if `client_list_create` fails
*
* @param this The client list
*/
void client_list_destroy(client_list_t* restrict this)
{
free(this->clients);
this->clients = NULL;
}
/**
* Clone a client list
*
* @param this The client list to clone
* @param out Memory slot in which to store the new client list
* @return Non-zero on error, `errno` will have been set accordingly
*/
int client_list_clone(const client_list_t* restrict this, client_list_t* restrict out)
{
size_t n = this->capacity * sizeof(uint64_t);
uint64_t* restrict new_clients = NULL;
out->clients = NULL;
if ((new_clients = malloc(n)) == NULL)
goto fail;
out->clients = new_clients;
out->capacity = this->capacity;
out->size = this->size;
memcpy(out->clients, this->clients, n);
return 0;
fail:
free(new_clients);
return -1;
}
/**
* Add a client to the list
*
* @param this The list
* @param client The client to add
* @return Non-zero on error, `errno` will be set accordingly
*/
int client_list_add(client_list_t* restrict this, uint64_t client)
{
if (this->size == this->capacity)
{
uint64_t* old = this->clients;
if (xrealloc(old, this->capacity <<= 1, uint64_t))
{
this->capacity >>= 1;
this->clients = old;
return -1;
}
}
this->clients[this->size++] = client;
return 0;
}
/**
* Remove a client from the list, once
*
* @param this The list
* @param client The client to remove
*/
void client_list_remove(client_list_t* restrict this, uint64_t client)
{
size_t i;
for (i = 0; i < this->size; i++)
{
if (this->clients[i] == client)
{
size_t n = (--(this->size) - i) * sizeof(uint64_t);
memmove(this->clients + i, this->clients + i + 1, n);
if (this->size << 1 <= this->capacity)
{
uint64_t* old = this->clients;
if (xrealloc(old, this->capacity >>= 1, uint64_t))
{
this->capacity <<= 1;
this->clients = old;
}
}
return;
}
}
}
/**
* Calculate the buffer size need to marshal a client list
*
* @param this The list
* @return The number of bytes to allocate to the output buffer
*/
size_t client_list_marshal_size(const client_list_t* restrict this)
{
return 2 * sizeof(size_t) + this->size * sizeof(uint64_t) + sizeof(int);
}
/**
* Marshals a client list
*
* @param this The list
* @param data Output buffer for the marshalled data
*/
void client_list_marshal(const client_list_t* restrict this, char* restrict data)
{
buf_set_next(data, int, CLIENT_LIST_T_VERSION);
buf_set_next(data, size_t, this->capacity);
buf_set_next(data, size_t, this->size);
memcpy(data, this->clients, this->size * sizeof(uint64_t));
}
/**
* Unmarshals a client list
*
* @param this Memory slot in which to store the new client list
* @param data In buffer with the marshalled data
* @return Non-zero on error, `errno` will be set accordingly.
* Destroy the list on error.
*/
int client_list_unmarshal(client_list_t* restrict this, char* restrict data)
{
size_t n;
/* buf_get(data, int, 0, CLIENT_LIST_T_VERSION); */
buf_next(data, int, 1);
this->clients = NULL;
buf_get_next(data, size_t, this->capacity);
buf_get_next(data, size_t, this->size);
n = this->capacity * sizeof(uint64_t);
if ((this->clients = malloc(n)) == NULL)
return -1;
n = this->size * sizeof(uint64_t);
memcpy(this->clients, data, n);
return 0;
}
|
