[thirdparty/systemd.git] / src / basic / macro.h

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

#pragma once

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <assert.h>
#include <inttypes.h>
#include <stdbool.h>
#include <sys/param.h>
#include <sys/types.h>

#define _printf_(a,b) __attribute__ ((format (printf, a, b)))
#define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
#define _sentinel_ __attribute__ ((sentinel))
#define _unused_ __attribute__ ((unused))
#define _destructor_ __attribute__ ((destructor))
#define _pure_ __attribute__ ((pure))
#define _const_ __attribute__ ((const))
#define _deprecated_ __attribute__ ((deprecated))
#define _packed_ __attribute__ ((packed))
#define _malloc_ __attribute__ ((malloc))
#define _weak_ __attribute__ ((weak))
#define _likely_(x) (__builtin_expect(!!(x),1))
#define _unlikely_(x) (__builtin_expect(!!(x),0))
#define _public_ __attribute__ ((visibility("default")))
#define _hidden_ __attribute__ ((visibility("hidden")))
#define _weakref_(x) __attribute__((weakref(#x)))
#define _alignas_(x) __attribute__((aligned(__alignof(x))))
#define _cleanup_(x) __attribute__((cleanup(x)))

/* Temporarily disable some warnings */
#define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT                     \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"")

#define DISABLE_WARNING_FORMAT_NONLITERAL                               \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")

#define DISABLE_WARNING_MISSING_PROTOTYPES                              \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")

#define DISABLE_WARNING_NONNULL                                         \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wnonnull\"")

#define DISABLE_WARNING_SHADOW                                          \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wshadow\"")

#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES                      \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")

#define REENABLE_WARNING                                                \
        _Pragma("GCC diagnostic pop")

/* automake test harness */
#define EXIT_TEST_SKIP 77

#define XSTRINGIFY(x) #x
#define STRINGIFY(x) XSTRINGIFY(x)

#define XCONCATENATE(x, y) x ## y
#define CONCATENATE(x, y) XCONCATENATE(x, y)

#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
#define UNIQ __COUNTER__

/* Rounds up */

#define ALIGN4(l) (((l) + 3) & ~3)
#define ALIGN8(l) (((l) + 7) & ~7)

#if __SIZEOF_POINTER__ == 8
#define ALIGN(l) ALIGN8(l)
#elif __SIZEOF_POINTER__ == 4
#define ALIGN(l) ALIGN4(l)
#else
#error "Wut? Pointers are neither 4 nor 8 bytes long?"
#endif

#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))

static inline size_t ALIGN_TO(size_t l, size_t ali) {
        return ((l + ali - 1) & ~(ali - 1));
}

#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))

/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
static inline unsigned long ALIGN_POWER2(unsigned long u) {
        /* clz(0) is undefined */
        if (u == 1)
                return 1;

        /* left-shift overflow is undefined */
        if (__builtin_clzl(u - 1UL) < 1)
                return 0;

        return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
}

#define ELEMENTSOF(x)                                                    \
        __extension__ (__builtin_choose_expr(                            \
                !__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
                sizeof(x)/sizeof((x)[0]),                                \
                (void)0))
/*
 * container_of - cast a member of a structure out to the containing structure
 * @ptr: the pointer to the member.
 * @type: the type of the container struct this is embedded in.
 * @member: the name of the member within the struct.
 */
#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
#define __container_of(uniq, ptr, type, member)                         \
        __extension__ ({                                                \
                const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
                (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type,member) ); \
        })

#undef MAX
#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
#define __MAX(aq, a, bq, b)                             \
        __extension__ ({                                \
                const typeof(a) UNIQ_T(A, aq) = (a);    \
                const typeof(b) UNIQ_T(B, bq) = (b);    \
                UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
        })

/* evaluates to (void) if _A or _B are not constant or of different types */
#define CONST_MAX(_A, _B) \
        __extension__ (__builtin_choose_expr(                           \
                __builtin_constant_p(_A) &&                             \
                __builtin_constant_p(_B) &&                             \
                __builtin_types_compatible_p(typeof(_A), typeof(_B)),   \
                ((_A) > (_B)) ? (_A) : (_B),                            \
                (void)0))

/* takes two types and returns the size of the larger one */
#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))

#define MAX3(x,y,z)                                     \
        __extension__ ({                                \
                        const typeof(x) _c = MAX(x,y);  \
                        MAX(_c, z);                     \
                })

#undef MIN
#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
#define __MIN(aq, a, bq, b)                             \
        __extension__ ({                                \
                const typeof(a) UNIQ_T(A, aq) = (a);    \
                const typeof(b) UNIQ_T(B, bq) = (b);    \
                UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
        })

#define MIN3(x,y,z)                                     \
        __extension__ ({                                \
                        const typeof(x) _c = MIN(x,y);  \
                        MIN(_c, z);                     \
                })

#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
#define __LESS_BY(aq, a, bq, b)                         \
        __extension__ ({                                \
                const typeof(a) UNIQ_T(A, aq) = (a);    \
                const typeof(b) UNIQ_T(B, bq) = (b);    \
                UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
        })

#undef CLAMP
#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
#define __CLAMP(xq, x, lowq, low, highq, high)                          \
        __extension__ ({                                                \
                const typeof(x) UNIQ_T(X,xq) = (x);                     \
                const typeof(low) UNIQ_T(LOW,lowq) = (low);             \
                const typeof(high) UNIQ_T(HIGH,highq) = (high);         \
                        UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ?             \
                                UNIQ_T(HIGH,highq) :                    \
                                UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ?       \
                                        UNIQ_T(LOW,lowq) :              \
                                        UNIQ_T(X,xq);                   \
        })

/* [(x + y - 1) / y] suffers from an integer overflow, even though the
 * computation should be possible in the given type. Therefore, we use
 * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
 * quotient and the remainder, so both should be equally fast. */
#define DIV_ROUND_UP(_x, _y)                                            \
        __extension__ ({                                                \
                const typeof(_x) __x = (_x);                            \
                const typeof(_y) __y = (_y);                            \
                (__x / __y + !!(__x % __y));                            \
        })

#define assert_message_se(expr, message)                                \
        do {                                                            \
                if (_unlikely_(!(expr)))                                \
                        log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
        } while (false)

#define assert_se(expr) assert_message_se(expr, #expr)

/* We override the glibc assert() here. */
#undef assert
#ifdef NDEBUG
#define assert(expr) do {} while(false)
#else
#define assert(expr) assert_message_se(expr, #expr)
#endif

#define assert_not_reached(t)                                           \
        do {                                                            \
                log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
        } while (false)

#if defined(static_assert)
/* static_assert() is sometimes defined in a way that trips up
 * -Wdeclaration-after-statement, hence let's temporarily turn off
 * this warning around it. */
#define assert_cc(expr)                                                 \
        DISABLE_WARNING_DECLARATION_AFTER_STATEMENT;                    \
        static_assert(expr, #expr);                                     \
        REENABLE_WARNING
#else
#define assert_cc(expr)                                                 \
        DISABLE_WARNING_DECLARATION_AFTER_STATEMENT;                    \
        struct CONCATENATE(_assert_struct_, __COUNTER__) {              \
                char x[(expr) ? 0 : -1];                                \
        };                                                              \
        REENABLE_WARNING
#endif

#define assert_log(expr, message) ((_likely_(expr))                     \
        ? (true)                                                        \
        : (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))

#define assert_return(expr, r)                                          \
        do {                                                            \
                if (!assert_log(expr, #expr))                           \
                        return (r);                                     \
        } while (false)

#define assert_return_errno(expr, r, err)                               \
        do {                                                            \
                if (!assert_log(expr, #expr)) {                         \
                        errno = err;                                    \
                        return (r);                                     \
                }                                                       \
        } while (false)

#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define memzero(x,l) (memset((x), 0, (l)))
#define zero(x) (memzero(&(x), sizeof(x)))

#define CHAR_TO_STR(x) ((char[2]) { x, 0 })

#define char_array_0(x) x[sizeof(x)-1] = 0;

#define VA_FORMAT_ADVANCE(format, ap)                                   \
do {                                                                    \
        int _argtypes[128];                                             \
        size_t _i, _k;                                                  \
        _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
        assert(_k < ELEMENTSOF(_argtypes));                             \
        for (_i = 0; _i < _k; _i++) {                                   \
                if (_argtypes[_i] & PA_FLAG_PTR)  {                     \
                        (void) va_arg(ap, void*);                       \
                        continue;                                       \
                }                                                       \
                                                                        \
                switch (_argtypes[_i]) {                                \
                case PA_INT:                                            \
                case PA_INT|PA_FLAG_SHORT:                              \
                case PA_CHAR:                                           \
                        (void) va_arg(ap, int);                         \
                        break;                                          \
                case PA_INT|PA_FLAG_LONG:                               \
                        (void) va_arg(ap, long int);                    \
                        break;                                          \
                case PA_INT|PA_FLAG_LONG_LONG:                          \
                        (void) va_arg(ap, long long int);               \
                        break;                                          \
                case PA_WCHAR:                                          \
                        (void) va_arg(ap, wchar_t);                     \
                        break;                                          \
                case PA_WSTRING:                                        \
                case PA_STRING:                                         \
                case PA_POINTER:                                        \
                        (void) va_arg(ap, void*);                       \
                        break;                                          \
                case PA_FLOAT:                                          \
                case PA_DOUBLE:                                         \
                        (void) va_arg(ap, double);                      \
                        break;                                          \
                case PA_DOUBLE|PA_FLAG_LONG_DOUBLE:                     \
                        (void) va_arg(ap, long double);                 \
                        break;                                          \
                default:                                                \
                        assert_not_reached("Unknown format string argument."); \
                }                                                       \
        }                                                               \
} while(false)

 /* Because statfs.t_type can be int on some architectures, we have to cast
  * the const magic to the type, otherwise the compiler warns about
  * signed/unsigned comparison, because the magic can be 32 bit unsigned.
 */
#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)

/* Returns the number of chars needed to format variables of the
 * specified type as a decimal string. Adds in extra space for a
 * negative '-' prefix (hence works correctly on signed
 * types). Includes space for the trailing NUL. */
#define DECIMAL_STR_MAX(type)                                           \
        (2+(sizeof(type) <= 1 ? 3 :                                     \
            sizeof(type) <= 2 ? 5 :                                     \
            sizeof(type) <= 4 ? 10 :                                    \
            sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))

#define SET_FLAG(v, flag, b) \
        (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))

#define IN_SET(x, y, ...)                                               \
        ({                                                              \
                static const typeof(y) _array[] = { (y), __VA_ARGS__ }; \
                const typeof(y) _x = (x);                               \
                unsigned _i;                                            \
                bool _found = false;                                    \
                for (_i = 0; _i < ELEMENTSOF(_array); _i++)             \
                        if (_array[_i] == _x) {                         \
                                _found = true;                          \
                                break;                                  \
                        }                                               \
                _found;                                                 \
        })

/* Return a nulstr for a standard cascade of configuration directories,
 * suitable to pass to conf_files_list_nulstr or config_parse_many. */
#define CONF_DIRS_NULSTR(n) \
        "/etc/" n ".d\0" \
        "/run/" n ".d\0" \
        "/usr/local/lib/" n ".d\0" \
        "/usr/lib/" n ".d\0" \
        CONF_DIR_SPLIT_USR(n)

#ifdef HAVE_SPLIT_USR
#define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
#else
#define CONF_DIR_SPLIT_USR(n)
#endif

/* Define C11 thread_local attribute even on older gcc compiler
 * version */
#ifndef thread_local
/*
 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
 */
#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
#define thread_local _Thread_local
#else
#define thread_local __thread
#endif
#endif

/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
 * compiler versions */
#ifndef noreturn
#if __STDC_VERSION__ >= 201112L
#define noreturn _Noreturn
#else
#define noreturn __attribute__((noreturn))
#endif
#endif

#define MODE_INVALID ((mode_t) -1)

#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)                 \
        static inline void func##p(type *p) {                   \
                if (*p)                                         \
                        func(*p);                               \
        }                                                       \
        struct __useless_struct_to_allow_trailing_semicolon__

#include "log.h"
Commit	Line	Data
03467c88	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
60918275	2
c2f1db8f	3	#pragma once
60918275	4
a7334b09 LP	5	/***
	6	This file is part of systemd.
	7
	8	Copyright 2010 Lennart Poettering
	9
	10	systemd is free software; you can redistribute it and/or modify it
5430f7f2 LP	11	under the terms of the GNU Lesser General Public License as published by
5430f7f2 LP	12	the Free Software Foundation; either version 2.1 of the License, or
a7334b09 LP	13	(at your option) any later version.
	14
	15	systemd is distributed in the hope that it will be useful, but
	16	WITHOUT ANY WARRANTY; without even the implied warranty of
	17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5430f7f2	18	Lesser General Public License for more details.
a7334b09	19
5430f7f2	20	You should have received a copy of the GNU Lesser General Public License
a7334b09 LP	21	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	22	***/
	23
60918275	24	#include <assert.h>
c31e1495	25	#include <inttypes.h>
c01ff965	26	#include <stdbool.h>
afc5dbf3 LP	27	#include <sys/param.h>
afc5dbf3 LP	28	#include <sys/types.h>
60918275	29
44b601bc	30	#define _printf_(a,b) __attribute__ ((format (printf, a, b)))
750ef272	31	#define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
93a46b0b	32	#define _sentinel_ __attribute__ ((sentinel))
93a46b0b LP	33	#define _unused_ __attribute__ ((unused))
	34	#define _destructor_ __attribute__ ((destructor))
	35	#define _pure_ __attribute__ ((pure))
	36	#define _const_ __attribute__ ((const))
	37	#define _deprecated_ __attribute__ ((deprecated))
	38	#define _packed_ __attribute__ ((packed))
	39	#define _malloc_ __attribute__ ((malloc))
	40	#define _weak_ __attribute__ ((weak))
	41	#define _likely_(x) (__builtin_expect(!!(x),1))
	42	#define _unlikely_(x) (__builtin_expect(!!(x),0))
40473a70 LP	43	#define _public_ __attribute__ ((visibility("default")))
40473a70 LP	44	#define _hidden_ __attribute__ ((visibility("hidden")))
ad780f19	45	#define _weakref_(x) __attribute__((weakref(#x)))
19d1e4ee	46	#define _alignas_(x) __attribute__((aligned(__alignof(x))))
dfb33a97	47	#define _cleanup_(x) __attribute__((cleanup(x)))
60918275	48
7ebe131a LP	49	/* Temporarily disable some warnings */
	50	#define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT \
	51	_Pragma("GCC diagnostic push"); \
	52	_Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"")
	53
bcfce235 LP	54	#define DISABLE_WARNING_FORMAT_NONLITERAL \
	55	_Pragma("GCC diagnostic push"); \
	56	_Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
	57
f0f2e63b LP	58	#define DISABLE_WARNING_MISSING_PROTOTYPES \
	59	_Pragma("GCC diagnostic push"); \
	60	_Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
	61
8fca4e30 LP	62	#define DISABLE_WARNING_NONNULL \
	63	_Pragma("GCC diagnostic push"); \
	64	_Pragma("GCC diagnostic ignored \"-Wnonnull\"")
	65
d442e2ec DH	66	#define DISABLE_WARNING_SHADOW \
	67	_Pragma("GCC diagnostic push"); \
	68	_Pragma("GCC diagnostic ignored \"-Wshadow\"")
	69
df99a9ef ZJS	70	#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
	71	_Pragma("GCC diagnostic push"); \
	72	_Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
	73
7ebe131a LP	74	#define REENABLE_WARNING \
	75	_Pragma("GCC diagnostic pop")
	76
49e5de64 ZJS	77	/* automake test harness */
	78	#define EXIT_TEST_SKIP 77
	79
bef2733f LP	80	#define XSTRINGIFY(x) #x
	81	#define STRINGIFY(x) XSTRINGIFY(x)
	82
ab9cbe34 LS	83	#define XCONCATENATE(x, y) x ## y
	84	#define CONCATENATE(x, y) XCONCATENATE(x, y)
	85
fb835651 DH	86	#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
	87	#define UNIQ __COUNTER__
	88
60918275	89	/* Rounds up */
9be9c7cf LP	90
	91	#define ALIGN4(l) (((l) + 3) & ~3)
	92	#define ALIGN8(l) (((l) + 7) & ~7)
	93
	94	#if __SIZEOF_POINTER__ == 8
	95	#define ALIGN(l) ALIGN8(l)
	96	#elif __SIZEOF_POINTER__ == 4
	97	#define ALIGN(l) ALIGN4(l)
	98	#else
	99	#error "Wut? Pointers are neither 4 nor 8 bytes long?"
	100	#endif
	101
5f86c1f4 LP	102	#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
	103	#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
	104	#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
e86b80b8	105
37f85e66	106	static inline size_t ALIGN_TO(size_t l, size_t ali) {
37f85e66	107	return ((l + ali - 1) & ~(ali - 1));
22be093f LP	108	}
22be093f LP	109
5f86c1f4	110	#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
49aa47c7	111
625e870b DH	112	/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
	113	static inline unsigned long ALIGN_POWER2(unsigned long u) {
	114	/* clz(0) is undefined */
	115	if (u == 1)
	116	return 1;
	117
	118	/* left-shift overflow is undefined */
	119	if (__builtin_clzl(u - 1UL) < 1)
	120	return 0;
	121
	122	return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
	123	}
	124
7f39a210 MS	125	#define ELEMENTSOF(x) \
	126	__extension__ (__builtin_choose_expr( \
	127	!__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
	128	sizeof(x)/sizeof((x)[0]), \
	129	(void)0))
bbc98d32 KS	130	/*
	131	* container_of - cast a member of a structure out to the containing structure
	132	* @ptr: the pointer to the member.
	133	* @type: the type of the container struct this is embedded in.
	134	* @member: the name of the member within the struct.
bbc98d32	135	*/
fb835651 DH	136	#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
fb835651 DH	137	#define __container_of(uniq, ptr, type, member) \
fa70beaa	138	__extension__ ({ \
fb835651 DH	139	const typeof( ((type)0)->member ) UNIQ_T(A, uniq) = (ptr); \
	140	(type)( (char )UNIQ_T(A, uniq) - offsetof(type,member) ); \
	141	})
bbc98d32	142
9607d947	143	#undef MAX
667a0377 DH	144	#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
667a0377 DH	145	#define __MAX(aq, a, bq, b) \
fdcba430	146	__extension__ ({ \
667a0377 DH	147	const typeof(a) UNIQ_T(A, aq) = (a); \
	148	const typeof(b) UNIQ_T(B, bq) = (b); \
	149	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	150	})
60918275	151
7242d742 DH	152	/* evaluates to (void) if _A or _B are not constant or of different types */
	153	#define CONST_MAX(_A, _B) \
	154	__extension__ (__builtin_choose_expr( \
	155	__builtin_constant_p(_A) && \
	156	__builtin_constant_p(_B) && \
	157	__builtin_types_compatible_p(typeof(_A), typeof(_B)), \
	158	((_A) > (_B)) ? (_A) : (_B), \
	159	(void)0))
	160
40a1eebd DH	161	/* takes two types and returns the size of the larger one */
	162	#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
	163
fdcba430 DH	164	#define MAX3(x,y,z) \
	165	__extension__ ({ \
	166	const typeof(x) _c = MAX(x,y); \
	167	MAX(_c, z); \
9607d947	168	})
3b63d2d3	169
9607d947	170	#undef MIN
667a0377 DH	171	#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
667a0377 DH	172	#define __MIN(aq, a, bq, b) \
fdcba430	173	__extension__ ({ \
667a0377 DH	174	const typeof(a) UNIQ_T(A, aq) = (a); \
	175	const typeof(b) UNIQ_T(B, bq) = (b); \
	176	UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	177	})
60918275	178
fdcba430 DH	179	#define MIN3(x,y,z) \
	180	__extension__ ({ \
	181	const typeof(x) _c = MIN(x,y); \
	182	MIN(_c, z); \
7df23077 DH	183	})
7df23077 DH	184
667a0377 DH	185	#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
667a0377 DH	186	#define __LESS_BY(aq, a, bq, b) \
fdcba430	187	__extension__ ({ \
667a0377 DH	188	const typeof(a) UNIQ_T(A, aq) = (a); \
	189	const typeof(b) UNIQ_T(B, bq) = (b); \
	190	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
	191	})
348ced90	192
667a0377 DH	193	#undef CLAMP
	194	#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
	195	#define __CLAMP(xq, x, lowq, low, highq, high) \
60918275	196	__extension__ ({ \
667a0377 DH	197	const typeof(x) UNIQ_T(X,xq) = (x); \
	198	const typeof(low) UNIQ_T(LOW,lowq) = (low); \
	199	const typeof(high) UNIQ_T(HIGH,highq) = (high); \
	200	UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \
	201	UNIQ_T(HIGH,highq) : \
	202	UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \
	203	UNIQ_T(LOW,lowq) : \
	204	UNIQ_T(X,xq); \
	205	})
60918275	206
180a60bc DH	207	/* [(x + y - 1) / y] suffers from an integer overflow, even though the
	208	* computation should be possible in the given type. Therefore, we use
	209	* [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
	210	* quotient and the remainder, so both should be equally fast. */
	211	#define DIV_ROUND_UP(_x, _y) \
	212	__extension__ ({ \
	213	const typeof(_x) __x = (_x); \
	214	const typeof(_y) __y = (_y); \
	215	(__x / __y + !!(__x % __y)); \
	216	})
	217
34c38d2a	218	#define assert_message_se(expr, message) \
dd8f71ee	219	do { \
93a46b0b	220	if (_unlikely_(!(expr))) \
34c38d2a MS	221	log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
	222	} while (false)
	223
	224	#define assert_se(expr) assert_message_se(expr, #expr)
dd8f71ee LP	225
	226	/* We override the glibc assert() here. */
	227	#undef assert
	228	#ifdef NDEBUG
	229	#define assert(expr) do {} while(false)
	230	#else
34c38d2a	231	#define assert(expr) assert_message_se(expr, #expr)
dd8f71ee	232	#endif
60918275	233
dd8f71ee LP	234	#define assert_not_reached(t) \
dd8f71ee LP	235	do { \
b7f33638	236	log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee	237	} while (false)
60918275	238
f791c684	239	#if defined(static_assert)
7ebe131a LP	240	/* static_assert() is sometimes defined in a way that trips up
	241	* -Wdeclaration-after-statement, hence let's temporarily turn off
	242	* this warning around it. */
	243	#define assert_cc(expr) \
	244	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
	245	static_assert(expr, #expr); \
	246	REENABLE_WARNING
f791c684	247	#else
7ebe131a LP	248	#define assert_cc(expr) \
7ebe131a LP	249	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
6825a04d	250	struct CONCATENATE(_assert_struct_, __COUNTER__) { \
7ebe131a LP	251	char x[(expr) ? 0 : -1]; \
	252	}; \
	253	REENABLE_WARNING
f791c684	254	#endif
60918275	255
34c38d2a MS	256	#define assert_log(expr, message) ((_likely_(expr)) \
	257	? (true) \
	258	: (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
366e6411	259
80514f9c LP	260	#define assert_return(expr, r) \
80514f9c LP	261	do { \
34c38d2a	262	if (!assert_log(expr, #expr)) \
80514f9c	263	return (r); \
18387b59 LP	264	} while (false)
18387b59 LP	265
aa029628 TG	266	#define assert_return_errno(expr, r, err) \
aa029628 TG	267	do { \
34c38d2a	268	if (!assert_log(expr, #expr)) { \
aa029628 TG	269	errno = err; \
	270	return (r); \
	271	} \
	272	} while (false)
	273
a3dc3547 KS	274	#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
a3dc3547 KS	275	#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
60918275	276	#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
a3dc3547	277	#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	278
a3dc3547 KS	279	#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
a3dc3547 KS	280	#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
c6c18be3	281	#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
a3dc3547	282	#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	283
a3dc3547 KS	284	#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
	285	#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
	286	#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
	287	#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	288
a3dc3547 KS	289	#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
	290	#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
	291	#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
	292	#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	293
74b2466e LP	294	#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
	295	#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	296
476fe607 LP	297	#define memzero(x,l) (memset((x), 0, (l)))
	298	#define zero(x) (memzero(&(x), sizeof(x)))
	299
a9c55a88 LP	300	#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
a9c55a88 LP	301
034c6ed7 LP	302	#define char_array_0(x) x[sizeof(x)-1] = 0;
034c6ed7 LP	303
cecd32f6 LP	304	#define VA_FORMAT_ADVANCE(format, ap) \
	305	do { \
	306	int _argtypes[128]; \
963ddb91 LP	307	size_t _i, _k; \
963ddb91 LP	308	_k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
cecd32f6	309	assert(_k < ELEMENTSOF(_argtypes)); \
963ddb91 LP	310	for (_i = 0; _i < _k; _i++) { \
	311	if (_argtypes[_i] & PA_FLAG_PTR) { \
	312	(void) va_arg(ap, void*); \
	313	continue; \
	314	} \
	315	\
	316	switch (_argtypes[_i]) { \
	317	case PA_INT: \
	318	case PA_INT\|PA_FLAG_SHORT: \
	319	case PA_CHAR: \
	320	(void) va_arg(ap, int); \
	321	break; \
	322	case PA_INT\|PA_FLAG_LONG: \
	323	(void) va_arg(ap, long int); \
	324	break; \
	325	case PA_INT\|PA_FLAG_LONG_LONG: \
	326	(void) va_arg(ap, long long int); \
	327	break; \
	328	case PA_WCHAR: \
	329	(void) va_arg(ap, wchar_t); \
	330	break; \
	331	case PA_WSTRING: \
	332	case PA_STRING: \
	333	case PA_POINTER: \
	334	(void) va_arg(ap, void*); \
	335	break; \
	336	case PA_FLOAT: \
	337	case PA_DOUBLE: \
	338	(void) va_arg(ap, double); \
	339	break; \
	340	case PA_DOUBLE\|PA_FLAG_LONG_DOUBLE: \
	341	(void) va_arg(ap, long double); \
	342	break; \
	343	default: \
	344	assert_not_reached("Unknown format string argument."); \
	345	} \
	346	} \
	347	} while(false)
	348
e5f476db	349	/* Because statfs.t_type can be int on some architectures, we have to cast
bdd29249 HH	350	* the const magic to the type, otherwise the compiler warns about
	351	* signed/unsigned comparison, because the magic can be 32 bit unsigned.
	352	*/
c51cf056	353	#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
bdd29249	354
fa70beaa LP	355	/* Returns the number of chars needed to format variables of the
fa70beaa LP	356	* specified type as a decimal string. Adds in extra space for a
b7ce6b59 LP	357	* negative '-' prefix (hence works correctly on signed
b7ce6b59 LP	358	* types). Includes space for the trailing NUL. */
fa70beaa	359	#define DECIMAL_STR_MAX(type) \
5bcb0f2b	360	(2+(sizeof(type) <= 1 ? 3 : \
fa70beaa LP	361	sizeof(type) <= 2 ? 5 : \
	362	sizeof(type) <= 4 ? 10 : \
	363	sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
	364
264ad849 LP	365	#define SET_FLAG(v, flag, b) \
	366	(v) = (b) ? ((v) \| (flag)) : ((v) & ~(flag))
	367
dc36d78e	368	#define IN_SET(x, y, ...) \
059d9fbb	369	({ \
77247cba	370	static const typeof(y) _array[] = { (y), __VA_ARGS__ }; \
249a2737	371	const typeof(y) _x = (x); \
059d9fbb LP	372	unsigned _i; \
059d9fbb LP	373	bool _found = false; \
249a2737 MS	374	for (_i = 0; _i < ELEMENTSOF(_array); _i++) \
249a2737 MS	375	if (_array[_i] == _x) { \
059d9fbb LP	376	_found = true; \
	377	break; \
	378	} \
	379	_found; \
cabb7806 LP	380	})
cabb7806 LP	381
7f0a55d4 JT	382	/* Return a nulstr for a standard cascade of configuration directories,
	383	* suitable to pass to conf_files_list_nulstr or config_parse_many. */
	384	#define CONF_DIRS_NULSTR(n) \
	385	"/etc/" n ".d\0" \
	386	"/run/" n ".d\0" \
	387	"/usr/local/lib/" n ".d\0" \
	388	"/usr/lib/" n ".d\0" \
	389	CONF_DIR_SPLIT_USR(n)
	390
	391	#ifdef HAVE_SPLIT_USR
	392	#define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
	393	#else
	394	#define CONF_DIR_SPLIT_USR(n)
	395	#endif
	396
919ce0b7 SL	397	/* Define C11 thread_local attribute even on older gcc compiler
919ce0b7 SL	398	* version */
ec202eae SL	399	#ifndef thread_local
	400	/*
	401	* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
	402	* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
	403	*/
	404	#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) \|\| (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
	405	#define thread_local _Thread_local
	406	#else
	407	#define thread_local __thread
	408	#endif
	409	#endif
cabb7806	410
919ce0b7 SL	411	/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
	412	* compiler versions */
	413	#ifndef noreturn
	414	#if __STDC_VERSION__ >= 201112L
	415	#define noreturn _Noreturn
	416	#else
	417	#define noreturn __attribute__((noreturn))
	418	#endif
	419	#endif
	420
fed1e721 LP	421	#define MODE_INVALID ((mode_t) -1)
fed1e721 LP	422
a2341f68 ZJS	423	#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
	424	static inline void func##p(type *p) { \
	425	if (*p) \
	426	func(*p); \
	427	} \
	428	struct __useless_struct_to_allow_trailing_semicolon__
	429
dd8f71ee	430	#include "log.h"