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git://sourceware.org/git/lvm2.git
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134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/*
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* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _LVM_UTIL_H
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#define _LVM_UTIL_H
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#include <inttypes.h>
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#define min(a, b) ({ typeof(a) _a = (a); \
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typeof(b) _b = (b); \
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(void) (&_a == &_b); \
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_a < _b ? _a : _b; })
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#define max(a, b) ({ typeof(a) _a = (a); \
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typeof(b) _b = (b); \
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(void) (&_a == &_b); \
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_a > _b ? _a : _b; })
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#define is_power_of_2(n) ((n) && !((n) & ((n) - 1)))
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#if defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 6)
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#define uninitialized_var(x) x
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#else
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#define uninitialized_var(x) x = x
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#endif
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/*
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* GCC 3.4 adds a __builtin_clz, which uses the count leading zeros (clz)
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* instruction on arches that have one. Provide a fallback using shifts
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* and comparisons for older compilers.
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*/
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#ifdef HAVE___BUILTIN_CLZ
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#define clz(x) __builtin_clz((x))
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#else /* ifdef HAVE___BUILTIN_CLZ */
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static unsigned _dm_clz(unsigned x)
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{
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int n;
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if ((int)x <= 0) return (~x >> 26) & 32;
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n = 1;
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if ((x >> 16) == 0) {
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n = n + 16;
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x = x << 16;
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}
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if ((x >> 24) == 0) {
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n = n + 8;
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x = x << 8;
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}
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if ((x >> 28) == 0) {
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n = n + 4;
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x = x << 4;
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}
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if ((x >> 30) == 0) {
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n = n + 2;
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x = x << 2;
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}
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n = n - (x >> 31);
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return n;
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}
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#define clz(x) _dm_clz((x))
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#endif /* ifdef HAVE___BUILTIN_CLZ */
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#ifdef HAVE___BUILTIN_CLZLL
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#define clzll(x) __builtin_clzll((x))
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#else /* ifdef HAVE___BUILTIN_CLZ */
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static unsigned _dm_clzll(unsigned long long x)
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{
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if (x <= 0xffffffff)
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return 32 + clz((unsigned) (x & 0xffffffff));
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return clz(x >> 32);
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}
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#define clzll(x) _dm_clzll((x))
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#endif /* ifdef HAVE___BUILTIN_CLZLL */
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#define KERNEL_VERSION(major, minor, release) (((major) << 16) + ((minor) << 8) + (release))
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/* Define some portable printing types */
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#define PRIsize_t "zu"
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#define PRIssize_t "zd"
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#define PRIptrdiff_t "td"
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#define PRIpid_t PRId32
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/* For convenience */
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#define FMTsize_t "%" PRIsize_t
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#define FMTssize_t "%" PRIssize_t
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#define FMTptrdiff_t "%" PRIptrdiff_t
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#define FMTpid_t "%" PRIpid_t
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#define FMTd8 "%" PRId8
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#define FMTd16 "%" PRId16
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#define FMTd32 "%" PRId32
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#define FMTd64 "%" PRId64
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#define FMTi8 "%" PRIi8
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#define FMTi16 "%" PRIi16
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#define FMTi32 "%" PRIi32
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#define FMTi64 "%" PRIi64
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#define FMTo8 "%" PRIo8
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#define FMTo16 "%" PRIo16
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#define FMTo32 "%" PRIo32
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#define FMTo64 "%" PRIo64
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#define FMTu8 "%" PRIu8
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#define FMTu16 "%" PRIu16
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#define FMTu32 "%" PRIu32
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#define FMTu64 "%" PRIu64
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#define FMTx8 "%" PRIx8
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#define FMTx16 "%" PRIx16
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#define FMTx32 "%" PRIx32
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#define FMTx64 "%" PRIx64
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#define FMTVGID "%." DM_TO_STRING(ID_LEN) "s"
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#endif
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