80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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* Copyright © 2013 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#ifndef _UTIL_H_
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#define _UTIL_H_
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#include <stdbool.h>
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#include <string.h>
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#define LONG_BITS (sizeof(long) * 8)
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#define NLONGS(x) (((x) + LONG_BITS - 1) / LONG_BITS)
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#define ARRAY_LENGTH(a) (sizeof(a) / (sizeof((a)[0])))
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#define unlikely(x) (__builtin_expect(!!(x),0))
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#undef min
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#undef max
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#define min(a,b) \
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({ __typeof__ (a) _a = (a); \
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__typeof__ (b) _b = (b); \
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_a > _b ? _b : _a; \
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})
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#define max(a,b) \
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({ __typeof__ (a) _a = (a); \
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__typeof__ (b) _b = (b); \
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_a > _b ? _a : _b; \
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})
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static inline bool
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startswith(const char *str, size_t len, const char *prefix, size_t plen)
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{
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return len >= plen && !strncmp(str, prefix, plen);
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}
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static inline int
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bit_is_set(const unsigned long *array, int bit)
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{
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return !!(array[bit / LONG_BITS] & (1LL << (bit % LONG_BITS)));
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}
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static inline void
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set_bit(unsigned long *array, int bit)
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{
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array[bit / LONG_BITS] |= (1LL << (bit % LONG_BITS));
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}
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static inline void
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clear_bit(unsigned long *array, int bit)
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{
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array[bit / LONG_BITS] &= ~(1LL << (bit % LONG_BITS));
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}
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static inline void
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set_bit_state(unsigned long *array, int bit, int state)
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{
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if (state)
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set_bit(array, bit);
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else
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clear_bit(array, bit);
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}
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#endif
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