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/* -*- mode: c; c-file-style: "openbsd" -*- */
/*
* Copyright (c) 2020 Vincent Bernat <bernat@luffy.cx>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* Helpers around bitmaps */
#include "lldpd.h"
/*
* Set vlan id in the bitmap
*/
void
bitmap_set(uint32_t *bmap, uint16_t vlan_id)
{
if (vlan_id < MAX_VLAN) bmap[vlan_id / 32] |= (((uint32_t)1) << (vlan_id % 32));
}
/*
* Checks if the bitmap is empty
*/
int
bitmap_isempty(uint32_t *bmap)
{
int i;
for (i = 0; i < VLAN_BITMAP_LEN; i++) {
if (bmap[i] != 0) return 0;
}
return 1;
}
/*
* Calculate the number of bits set in the bitmap to get total
* number of VLANs
*/
unsigned int
bitmap_numbits(uint32_t *bmap)
{
unsigned int num = 0;
for (int i = 0; (i < VLAN_BITMAP_LEN); i++) {
uint32_t v = bmap[i];
v = v - ((v >> 1) & 0x55555555);
v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
num += (((v + (v >> 4)) & 0x0F0F0F0F) * 0x01010101) >> 24;
}
return num;
}
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