2 * Copyright (c) 2008, 2011, 2015 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #define TYPE_PROPS_H 1
22 /* True if TYPE is _Bool, false otherwise. */
23 #define TYPE_IS_BOOL(TYPE) ((TYPE) 1 == (TYPE) 2)
25 /* True if TYPE is an integer type (including _Bool), false if it is a
26 * floating-point type. */
27 #define TYPE_IS_INTEGER(TYPE) ((TYPE) 1.5 == (TYPE) 1)
29 /* True if TYPE is a signed integer or floating point type, otherwise false. */
30 #define TYPE_IS_SIGNED(TYPE) ((TYPE) 1 > (TYPE) -1)
32 /* The number of value bits in an signed or unsigned integer TYPE:
34 * - _Bool has 1 value bit.
36 * - An N-bit unsigned integer type has N value bits.
38 * - An N-bit signed integer type has N-1 value bits.
40 #define TYPE_VALUE_BITS(TYPE) \
41 (TYPE_IS_BOOL(TYPE) ? 1 : sizeof(TYPE) * CHAR_BIT - TYPE_IS_SIGNED(TYPE))
43 /* The minimum or maximum value of a signed or unsigned integer TYPE. */
44 #define TYPE_MINIMUM(TYPE) (TYPE_IS_SIGNED(TYPE) ? -TYPE_MAXIMUM(TYPE) - 1 : 0)
45 #define TYPE_MAXIMUM(TYPE) \
46 ((((TYPE)1 << (TYPE_VALUE_BITS(TYPE) - 1)) - 1) * 2 + 1)
48 /* Number of decimal digits required to format an integer of the given TYPE.
49 * Includes space for a sign, if TYPE is signed, but not for a null
52 * The value is an overestimate. */
53 #define INT_STRLEN(TYPE) (TYPE_IS_SIGNED(TYPE) + TYPE_VALUE_BITS(TYPE) / 3 + 1)
55 #endif /* type-props.h */