Linux Kernel  3.7.1
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ring_buffer.c
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1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
2  *
3  * Marek Lindner
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of version 2 of the GNU General Public
7  * License as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA
18  */
19 
20 #include "main.h"
21 #include "ring_buffer.h"
22 
23 void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
24  uint8_t value)
25 {
26  lq_recv[*lq_index] = value;
27  *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
28 }
29 
31 {
32  const uint8_t *ptr;
33  uint16_t count = 0, i = 0, sum = 0;
34 
35  ptr = lq_recv;
36 
38  if (*ptr != 0) {
39  count++;
40  sum += *ptr;
41  }
42 
43  i++;
44  ptr++;
45  }
46 
47  if (count == 0)
48  return 0;
49 
50  return (uint8_t)(sum / count);
51 }