arch/score/lib/checksum_copy.c

   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 <linux/uaccess.h>
  29
  30 unsigned 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
  39 unsigned 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 EXPORT_SYMBOL(csum_partial_copy_from_user);