66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/*
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*
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* Copyright 2015 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#ifndef GRPC_SUPPORT_USEFUL_H
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#define GRPC_SUPPORT_USEFUL_H
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/** useful macros that don't belong anywhere else */
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#define GPR_MIN(a, b) ((a) < (b) ? (a) : (b))
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#define GPR_MAX(a, b) ((a) > (b) ? (a) : (b))
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#define GPR_CLAMP(a, min, max) ((a) < (min) ? (min) : (a) > (max) ? (max) : (a))
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/** rotl, rotr assume x is unsigned */
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#define GPR_ROTL(x, n) (((x) << (n)) | ((x) >> (sizeof(x) * 8 - (n))))
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#define GPR_ROTR(x, n) (((x) >> (n)) | ((x) << (sizeof(x) * 8 - (n))))
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#define GPR_ARRAY_SIZE(array) (sizeof(array) / sizeof(*(array)))
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#define GPR_SWAP(type, a, b) \
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do { \
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type x = a; \
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a = b; \
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b = x; \
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} while (0)
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/** Set the \a n-th bit of \a i (a mutable pointer). */
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#define GPR_BITSET(i, n) ((*(i)) |= (1u << (n)))
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/** Clear the \a n-th bit of \a i (a mutable pointer). */
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#define GPR_BITCLEAR(i, n) ((*(i)) &= ~(1u << (n)))
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/** Get the \a n-th bit of \a i */
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#define GPR_BITGET(i, n) (((i) & (1u << (n))) != 0)
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#define GPR_INTERNAL_HEXDIGIT_BITCOUNT(x) \
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((x) - (((x) >> 1) & 0x77777777) - (((x) >> 2) & 0x33333333) - \
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(((x) >> 3) & 0x11111111))
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/** Returns number of bits set in bitset \a i */
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#define GPR_BITCOUNT(i) \
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(((GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) + \
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(GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) >> 4)) & \
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0x0f0f0f0f) % \
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255)
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#define GPR_ICMP(a, b) ((a) < (b) ? -1 : ((a) > (b) ? 1 : 0))
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#define GPR_HASH_POINTER(x, range) \
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((((size_t)x) >> 4) ^ (((size_t)x) >> 9) ^ (((size_t)x) >> 14)) % (range)
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#endif /* GRPC_SUPPORT_USEFUL_H */
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