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/*
* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _LVM_UTIL_H
#define _LVM_UTIL_H
#include <inttypes.h>
#define min(a, b) ({ typeof(a) _a = (a); \
typeof(b) _b = (b); \
(void) (&_a == &_b); \
_a < _b ? _a : _b; })
#define max(a, b) ({ typeof(a) _a = (a); \
typeof(b) _b = (b); \
(void) (&_a == &_b); \
_a > _b ? _a : _b; })
#define is_power_of_2(n) ((n) && !((n) & ((n) - 1)))
#if defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 6)
#define uninitialized_var(x) x
#else
#define uninitialized_var(x) x = x
#endif
#define KERNEL_VERSION(major, minor, release) (((major) << 16) + ((minor) << 8) + (release))
/* Define some portable printing types */
#define PRIsize_t "zu"
#define PRIssize_t "zd"
#define PRIptrdiff_t "td"
#define PRIpid_t PRId32
/* For convenience */
#define FMTsize_t "%" PRIsize_t
#define FMTssize_t "%" PRIssize_t
#define FMTptrdiff_t "%" PRIptrdiff_t
#define FMTpid_t "%" PRIpid_t
#define FMTd8 "%" PRId8
#define FMTd16 "%" PRId16
#define FMTd32 "%" PRId32
#define FMTd64 "%" PRId64
#define FMTi8 "%" PRIi8
#define FMTi16 "%" PRIi16
#define FMTi32 "%" PRIi32
#define FMTi64 "%" PRIi64
#define FMTo8 "%" PRIo8
#define FMTo16 "%" PRIo16
#define FMTo32 "%" PRIo32
#define FMTo64 "%" PRIo64
#define FMTu8 "%" PRIu8
#define FMTu16 "%" PRIu16
#define FMTu32 "%" PRIu32
#define FMTu64 "%" PRIu64
#define FMTx8 "%" PRIx8
#define FMTx16 "%" PRIx16
#define FMTx32 "%" PRIx32
#define FMTx64 "%" PRIx64
#define FMTVGID "%." DM_TO_STRING(ID_LEN) "s"
/*
* GCC 3.4 adds a __builtin_clz, which uses the count leading zeros (clz)
* instruction on arches that have one. Provide a fallback using shifts
* and comparisons for older compilers.
*/
#ifdef HAVE___BUILTIN_CLZ
#define clz(x) __builtin_clz((x))
#else /* ifdef HAVE___BUILTIN_CLZ */
static unsigned _dm_clz(unsigned x)
{
int n;
if ((int)x <= 0) return (~x >> 26) & 32;
n = 1;
if ((x >> 16) == 0) {
n = n + 16;
x = x << 16;
}
if ((x >> 24) == 0) {
n = n + 8;
x = x << 8;
}
if ((x >> 28) == 0) {
n = n + 4;
x = x << 4;
}
if ((x >> 30) == 0) {
n = n + 2;
x = x << 2;
}
n = n - (x >> 31);
return n;
}
#define clz(x) _dm_clz((x))
#endif /* ifdef HAVE___BUILTIN_CLZ */
#endif
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