wrapper/kstrtox.h

   1 #ifndef _LTTNG_WRAPPER_KSTRTOX_H
   2 #define _LTTNG_WRAPPER_KSTRTOX_H
   3
   4 /*
   5  * wrapper/kstrtox.h
   6  *
   7  * Copyright (C) 2015 Michael Jeanson <mjeanson@efficios.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <linux/version.h>
  25
  26 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0))
  27
  28 /* Excludes final \0. */
  29 #define LTTNG_MAX_UINT_CHAR 10
  30
  31 static inline
  32 int __must_check lttng_kstrtouint_from_user(const char __user *ubuf,
  33                 size_t count, unsigned int base, unsigned int *res)
  34 {
  35         unsigned int _res;
  36         char kbuf[LTTNG_MAX_UINT_CHAR + 1], *endptr;
  37
  38         memset(kbuf, 0, sizeof(kbuf));
  39         if (copy_from_user(kbuf, ubuf, min_t(size_t, LTTNG_MAX_UINT_CHAR, count)))
  40                 return -EFAULT;
  41
  42         _res = simple_strtoul(kbuf, &endptr, base);
  43         if (!endptr)
  44                 return -EINVAL;
  45
  46         *res = _res;
  47         return 0;
  48 }
  49 #else
  50 static inline
  51 int __must_check lttng_kstrtouint_from_user(const char __user *ubuf,
  52                 size_t count, unsigned int base, unsigned int *res)
  53 {
  54         return kstrtouint_from_user(ubuf, count, base, res);
  55 }
  56 #endif
  57
  58 #endif /* _LTTNG_WRAPPER_KSTRTOX_H */