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https://github.com/openvswitch/ovs
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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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* Copyright (c) 2008, 2011, 2015 Nicira, Inc.
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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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#ifndef OPENVSWITCH_TYPE_PROPS_H
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#define OPENVSWITCH_TYPE_PROPS_H 1
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#include <limits.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* True if TYPE is _Bool, false otherwise. */
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#define TYPE_IS_BOOL(TYPE) ((TYPE) 1 == (TYPE) 2)
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/* True if TYPE is an integer type (including _Bool), false if it is a
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* floating-point type. */
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#define TYPE_IS_INTEGER(TYPE) ((TYPE) 1.5 == (TYPE) 1)
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/* True if TYPE is a signed integer or floating point type, otherwise false. */
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#define TYPE_IS_SIGNED(TYPE) ((TYPE) 1 > (TYPE) -1)
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/* The number of value bits in an signed or unsigned integer TYPE:
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*
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* - _Bool has 1 value bit.
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*
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* - An N-bit unsigned integer type has N value bits.
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*
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* - An N-bit signed integer type has N-1 value bits.
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*/
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#define TYPE_VALUE_BITS(TYPE) \
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(TYPE_IS_BOOL(TYPE) ? 1 : sizeof(TYPE) * CHAR_BIT - TYPE_IS_SIGNED(TYPE))
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/* The minimum or maximum value of a signed or unsigned integer TYPE. */
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#define TYPE_MINIMUM(TYPE) (TYPE_IS_SIGNED(TYPE) ? -TYPE_MAXIMUM(TYPE) - 1 : 0)
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#define TYPE_MAXIMUM(TYPE) \
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((((TYPE)1 << (TYPE_VALUE_BITS(TYPE) - 1)) - 1) * 2 + 1)
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/* Number of decimal digits required to format an integer of the given TYPE.
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* Includes space for a sign, if TYPE is signed, but not for a null
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* terminator.
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*
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* The value is an overestimate. */
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#define INT_STRLEN(TYPE) (TYPE_IS_SIGNED(TYPE) + TYPE_VALUE_BITS(TYPE) / 3 + 1)
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#ifdef __cplusplus
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}
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#endif
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#endif /* type-props.h */
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