LXR linux/arch/score/lib/checksum

   1/*
   2 * arch/score/lib/csum_partial_copy.c
   3 *
   4 * Score Processor version.
   5 *
   6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7 *  Lennox Wu <lennox.wu@sunplusct.com>
   8 *  Chen Liqin <liqin.chen@sunplusct.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, see the file COPYING, or write
  22 * to the Free Software Foundation, Inc.,
  23 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24 */
  25
  26#include <net/checksum.h>
  27
  28#include <asm/uaccess.h>
  29
  30unsigned int csum_partial_copy(const char *src, char *dst,
  31                                int len, unsigned int sum)
  32{
  33        sum = csum_partial(src, len, sum);
  34        memcpy(dst, src, len);
  35
  36        return sum;
  37}
  38
  39unsigned int csum_partial_copy_from_user(const char *src, char *dst,
  40                                        int len, unsigned int sum,
  41                                        int *err_ptr)
  42{
  43        int missing;
  44
  45        missing = copy_from_user(dst, src, len);
  46        if (missing) {
  47                memset(dst + len - missing, 0, missing);
  48                *err_ptr = -EFAULT;
  49        }
  50
  51        return csum_partial(dst, len, sum);
  52}
  53