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uaccess.c

/*
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/string.h>
#include <asm/uaccess.h>

#include <asm/bug.h>

long strnlen_user(const char __user *src, long count)
{
      return strlen(src) + 1;
}

#define __do_strncpy_from_user(dst, src, count, res)              \
      do {                                            \
            char *tmp;                                \
            strncpy(dst, src, count);                       \
            for (tmp = dst; *tmp && count > 0; tmp++, count--)    \
                  ;                                   \
            res = (tmp - dst);                              \
      } while (0)

long __strncpy_from_user(char *dst, const char __user *src, long count)
{
      long res;
      __do_strncpy_from_user(dst, src, count, res);
      return res;
}

long strncpy_from_user(char *dst, const char __user *src, long count)
{
      long res = -EFAULT;
      if (access_ok(VERIFY_READ, src, 1))
            __do_strncpy_from_user(dst, src, count, res);
      return res;
}

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