mirror of
https://github.com/openvswitch/ovs
synced 2025-10-27 15:18:06 +00:00
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/*
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* Copyright (c) 2008 Nicira Networks.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#include "bitmap.h"
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#include <string.h>
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/* Sets 'count' consecutive bits in 'bitmap', starting at bit offset 'start',
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* to 'value'. */
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void
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bitmap_set_multiple(unsigned long *bitmap, size_t start, size_t count,
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bool value)
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{
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for (; count && start % BITMAP_ULONG_BITS; count--) {
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bitmap_set(bitmap, start++, value);
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}
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for (; count >= BITMAP_ULONG_BITS; count -= BITMAP_ULONG_BITS) {
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*bitmap_unit__(bitmap, start) = -(unsigned long) value;
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start += BITMAP_ULONG_BITS;
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}
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for (; count; count--) {
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bitmap_set(bitmap, start++, value);
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}
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}
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/* Compares the 'n' bits in bitmaps 'a' and 'b'. Returns true if all bits are
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* equal, false otherwise. */
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bool
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bitmap_equal(const unsigned long *a, const unsigned long *b, size_t n)
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{
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size_t i;
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if (memcmp(a, b, n / BITMAP_ULONG_BITS * sizeof(unsigned long))) {
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return false;
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}
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for (i = ROUND_DOWN(n, BITMAP_ULONG_BITS); i < n; i++) {
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if (bitmap_is_set(a, i) != bitmap_is_set(b, i)) {
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return false;
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}
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}
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return true;
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}
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