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/*
*
* Copyright 2015-2016, 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 */
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