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
|
/**
* 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/>.
*/
#ifndef MDS_LIBMDSSERVER_MACROS_H
#define MDS_LIBMDSSERVER_MACROS_H
/*
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
*/
/**
* Wrapper for `snprintf` that allows you to forget about the buffer size
*
* @param buffer:char[] The buffer, must be of the type `char[]` and not `char*`
* @param format:char* The format
* @param ... The arguments
*/
#define xsnprintf(buffer, format, ...) \
snprintf(buffer, sizeof(buffer) / sizeof(char), format, __VA_ARGS__)
/**
* Wrapper for `fprintf` that prints to `stderr` with
* the program name prefixed and new line suffixed
*
* @param format:char* The format
*/
#define eprint(format) \
fprintf(stderr, "%s: " format "\n", *argv)
/**
* Wrapper for `fprintf` that prints to `stderr` with
* the program name prefixed and new line suffixed
*
* @param format:char* The format
* @param ... The arguments
*/
#define eprintf(format, ...) \
fprintf(stderr, "%s: " format "\n", *argv, __VA_ARGS__)
/**
* Wrapper for `pthread_mutex_lock` and `pthread_mutex_unlock`
*
* @param mutex:pthread_mutex_t The mutex
* @param instructions The instructions to run while the mutex is locked
*/
#define with_mutex(mutex, instructions) \
pthread_mutex_lock(&(mutex)); \
instructions \
pthread_mutex_unlock(&(mutex))
/**
* Return the maximum value of two values
*
* @param a One of the values
* @param b The other one of the values
* @return The maximum value
*/
#define max(a, b) \
(a < b ? b : a)
/**
* Return the minimum value of two values
*
* @param a One of the values
* @param b The other one of the values
* @return The minimum value
*/
#define min(a, b) \
(a < b ? a : b)
/**
* Cast a buffer to another type and get the slot for an element
*
* @param buffer:char* The buffer
* @param type The data type of the elements for the data type to cast the buffer to
* @param index:size_t The index of the element to address
* @return [type] A slot that can be set or get
*/
#define buf_cast(buffer, type, index) \
((type*)(buffer))[index]
/**
* Set the value of an element a buffer that is being cast
*
* @param buffer:char* The buffer
* @param type The data type of the elements for the data type to cast the buffer to
* @param index:size_t The index of the element to address
* @param variable:type The new value of the element
* @return :variable The new value of the element
*/
#define buf_set(buffer, type, index, variable) \
((type*)(buffer))[index] = (variable)
/**
* Get the value of an element a buffer that is being cast
*
* @param buffer:char* The buffer
* @param type The data type of the elements for the data type to cast the buffer to
* @param index:size_t The index of the element to address
* @param variable:type Slot to set with the value of the element
* @return :variable The value of the element
*/
#define buf_get(buffer, type, index, variable) \
variable = ((type*)(buffer))[index]
/**
* Increase the pointer of a buffer
*
* @param buffer:char* The buffer
* @param type A data type
* @param count The number elements of the data type `type` to increase the pointer with
*/
#define buf_next(buffer, type, count) \
buffer += (count) * sizeof(type) / sizeof(char)
/**
* Decrease the pointer of a buffer
*
* @param buffer:char* The buffer
* @param type A data type
* @param count The number elements of the data type `type` to decrease the pointer with
*/
#define buf_prev(buffer, type, count) \
buffer -= (count) * sizeof(type) / sizeof(char)
/**
* This macro combines `buf_set` with `buf_next`, it sets
* element zero and increase the pointer by one element
*
* @param buffer:char* The buffer
* @param type The data type of the elements for the data type to cast the buffer to
* @param variable:type The new value of the element
* @return :variable The new value of the element
*/
#define buf_set_next(buffer, type, variable) \
buf_set(buffer, type, 0, variable); \
buf_next(buffer, type, 1)
/**
* This macro combines `buf_set` with `buf_next`, it sets
* element zero and increase the pointer by one element
*
* @param buffer:char* The buffer
* @param type The data type of the elements for the data type to cast the buffer to
* @param variable:type Slot to set with the value of the element
* @return :variable The value of the element
*/
#define buf_get_next(buffer, type, variable) \
buf_get(buffer, type, 0, variable); \
buf_next(buffer, type, 1)
#endif
|
