arch/microblaze/lib/uaccess.c

   1 /*
   2  * Copyright (C) 2006 Atmark Techno, Inc.
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  */
   8
   9 #include <linux/string.h>
  10 #include <asm/uaccess.h>
  11
  12 #include <asm/bug.h>
  13
  14 long strnlen_user(const char __user *src, long count)
  15 {
  16         return strlen(src) + 1;
  17 }
  18
  19 #define __do_strncpy_from_user(dst, src, count, res)                    \
  20         do {                                                            \
  21                 char *tmp;                                              \
  22                 strncpy(dst, src, count);                               \
  23                 for (tmp = dst; *tmp && count > 0; tmp++, count--)      \
  24                         ;                                               \
  25                 res = (tmp - dst);                                      \
  26         } while (0)
  27
  28 long __strncpy_from_user(char *dst, const char __user *src, long count)
  29 {
  30         long res;
  31         __do_strncpy_from_user(dst, src, count, res);
  32         return res;
  33 }
  34
  35 long strncpy_from_user(char *dst, const char __user *src, long count)
  36 {
  37         long res = -EFAULT;
  38         if (access_ok(VERIFY_READ, src, 1))
  39                 __do_strncpy_from_user(dst, src, count, res);
  40         return res;
  41 }