/* * * Copyright 2015, Google Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #ifndef GRPC_SUPPORT_USEFUL_H #define GRPC_SUPPORT_USEFUL_H /* useful macros that don't belong anywhere else */ #define GPR_MIN(a, b) ((a) < (b) ? (a) : (b)) #define GPR_MAX(a, b) ((a) > (b) ? (a) : (b)) #define GPR_CLAMP(a, min, max) ((a) < (min) ? (min) : (a) > (max) ? (max) : (a)) /* rotl, rotr assume x is unsigned */ #define GPR_ROTL(x, n) (((x) << (n)) | ((x) >> (sizeof(x) * 8 - (n)))) #define GPR_ROTR(x, n) (((x) >> (n)) | ((x) << (sizeof(x) * 8 - (n)))) #define GPR_ARRAY_SIZE(array) (sizeof(array) / sizeof(*(array))) #define GPR_SWAP(type, a, b) \ do { \ type x = a; \ a = b; \ b = x; \ } while (0) /** Set the \a n-th bit of \a i (a mutable pointer). */ #define GPR_BITSET(i, n) ((*(i)) |= (1u << (n))) /** Clear the \a n-th bit of \a i (a mutable pointer). */ #define GPR_BITCLEAR(i, n) ((*(i)) &= ~(1u << (n))) /** Get the \a n-th bit of \a i */ #define GPR_BITGET(i, n) (((i) & (1u << (n))) != 0) #define GPR_INTERNAL_HEXDIGIT_BITCOUNT(x) \ ((x) - (((x) >> 1) & 0x77777777) - (((x) >> 2) & 0x33333333) - \ (((x) >> 3) & 0x11111111)) /** Returns number of bits set in bitset \a i */ #define GPR_BITCOUNT(i) \ (((GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) + \ (GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) >> 4)) & \ 0x0f0f0f0f) % \ 255) #define GPR_ICMP(a, b) ((a) < (b) ? -1 : ((a) > (b) ? 1 : 0)) #endif /* GRPC_SUPPORT_USEFUL_H */