1/*
2 * ngtcp2
3 *
4 * Copyright (c) 2017 ngtcp2 contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25#ifndef NGTCP2_MACRO_H
26#define NGTCP2_MACRO_H
27
28#ifdef HAVE_CONFIG_H
29#  include <config.h>
30#endif /* HAVE_CONFIG_H */
31
32#include <stddef.h>
33
34#include <ngtcp2/ngtcp2.h>
35
36#define ngtcp2_min(A, B) ((A) < (B) ? (A) : (B))
37#define ngtcp2_max(A, B) ((A) > (B) ? (A) : (B))
38
39#define ngtcp2_struct_of(ptr, type, member)                                    \
40  ((type *)(void *)((char *)(ptr)-offsetof(type, member)))
41
42/* ngtcp2_list_insert inserts |T| before |*PD|.  The contract is that
43   this is singly linked list, and the next element is pointed by next
44   field of the previous element.  |PD| must be a pointer to the
45   pointer to the next field of the previous element of |*PD|: if C is
46   the previous element of |PD|, PD = &C->next. */
47#define ngtcp2_list_insert(T, PD)                                              \
48  do {                                                                         \
49    (T)->next = *(PD);                                                         \
50    *(PD) = (T);                                                               \
51  } while (0)
52
53#endif /* NGTCP2_MACRO_H */
54