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