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74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
/*
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* Copyright (C) 2013 Freie Universität Berlin.
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @{
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* @file net_help.c
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* @brief Providing implementation for prototypes defined in net_help.h.
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* @author Oliver Gesch <oliver.gesch@googlemail.com>
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*/
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#include <stdio.h>
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#include <string.h>
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#include "thread.h"
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#include "net_help.h"
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void printArrayRange(uint8_t *array, uint16_t len, char *str)
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{
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int i = 0;
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printf("-------------%s-------------\n", str);
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for (i = 0; i < len; i++) {
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printf("%#x ", *(array + i));
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}
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printf("\n-----------%u-------------\n", len);
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}
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uint16_t csum(uint16_t sum, uint8_t *buf, uint16_t len)
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{
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int count;
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uint16_t carry;
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count = len >> 1;
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if (count) {
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if (count) {
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carry = 0;
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do {
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uint16_t t = (*buf << 8) + *(buf + 1);
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count--;
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buf += 2;
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sum += carry;
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sum += t;
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carry = (t > sum);
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}
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while (count);
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sum += carry;
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}
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}
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if (len & 1) {
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uint16_t u = (*buf << 8);
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sum += (*buf << 8);
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if (sum < u) {
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sum++;
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}
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}
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return sum;
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}
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/**
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* @}
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*/
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