[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
	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
	2
	3	#pragma once
	4
	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
	11	under the terms of the GNU Lesser General Public License as published by
	12	the Free Software Foundation; either version 2.1 of the License, or
	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
	18	Lesser General Public License for more details.
	19
	20	You should have received a copy of the GNU Lesser General Public License
	21	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	22	***/
	23
	24	#include <assert.h>
	25	#include <inttypes.h>
	26	#include <stdbool.h>
	27	#include <sys/param.h>
	28	#include <sys/types.h>
	29
	30	#define _printf_(a,b) __attribute__ ((format (printf, a, b)))
	31	#define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
	32	#define _sentinel_ __attribute__ ((sentinel))
	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))
	43	#define _public_ __attribute__ ((visibility("default")))
	44	#define _hidden_ __attribute__ ((visibility("hidden")))
	45	#define _weakref_(x) __attribute__((weakref(#x)))
	46	#define _alignas_(x) __attribute__((aligned(__alignof(x))))
	47	#define _cleanup_(x) __attribute__((cleanup(x)))
	48
	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
	54	#define DISABLE_WARNING_FORMAT_NONLITERAL \
	55	_Pragma("GCC diagnostic push"); \
	56	_Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
	57
	58	#define DISABLE_WARNING_MISSING_PROTOTYPES \
	59	_Pragma("GCC diagnostic push"); \
	60	_Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
	61
	62	#define DISABLE_WARNING_NONNULL \
	63	_Pragma("GCC diagnostic push"); \
	64	_Pragma("GCC diagnostic ignored \"-Wnonnull\"")
	65
	66	#define DISABLE_WARNING_SHADOW \
	67	_Pragma("GCC diagnostic push"); \
	68	_Pragma("GCC diagnostic ignored \"-Wshadow\"")
	69
	70	#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
	71	_Pragma("GCC diagnostic push"); \
	72	_Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
	73
	74	#define REENABLE_WARNING \
	75	_Pragma("GCC diagnostic pop")
	76
	77	/* automake test harness */
	78	#define EXIT_TEST_SKIP 77
	79
	80	#define XSTRINGIFY(x) #x
	81	#define STRINGIFY(x) XSTRINGIFY(x)
	82
	83	#define XCONCATENATE(x, y) x ## y
	84	#define CONCATENATE(x, y) XCONCATENATE(x, y)
	85
	86	#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
	87	#define UNIQ __COUNTER__
	88
	89	/* Rounds up */
	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
	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)))
	105
	106	static inline size_t ALIGN_TO(size_t l, size_t ali) {
	107	return ((l + ali - 1) & ~(ali - 1));
	108	}
	109
	110	#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
	111
	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
	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))
	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.
	135	*/
	136	#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
	137	#define __container_of(uniq, ptr, type, member) \
	138	__extension__ ({ \
	139	const typeof( ((type)0)->member ) UNIQ_T(A, uniq) = (ptr); \
	140	(type)( (char )UNIQ_T(A, uniq) - offsetof(type,member) ); \
	141	})
	142
	143	#undef MAX
	144	#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
	145	#define __MAX(aq, a, bq, b) \
	146	__extension__ ({ \
	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	})
	151
	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
	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
	164	#define MAX3(x,y,z) \
	165	__extension__ ({ \
	166	const typeof(x) _c = MAX(x,y); \
	167	MAX(_c, z); \
	168	})
	169
	170	#undef MIN
	171	#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
	172	#define __MIN(aq, a, bq, b) \
	173	__extension__ ({ \
	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	})
	178
	179	#define MIN3(x,y,z) \
	180	__extension__ ({ \
	181	const typeof(x) _c = MIN(x,y); \
	182	MIN(_c, z); \
	183	})
	184
	185	#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
	186	#define __LESS_BY(aq, a, bq, b) \
	187	__extension__ ({ \
	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	})
	192
	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) \
	196	__extension__ ({ \
	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	})
	206
	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
	218	#define assert_message_se(expr, message) \
	219	do { \
	220	if (_unlikely_(!(expr))) \
	221	log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
	222	} while (false)
	223
	224	#define assert_se(expr) assert_message_se(expr, #expr)
	225
	226	/* We override the glibc assert() here. */
	227	#undef assert
	228	#ifdef NDEBUG
	229	#define assert(expr) do {} while(false)
	230	#else
	231	#define assert(expr) assert_message_se(expr, #expr)
	232	#endif
	233
	234	#define assert_not_reached(t) \
	235	do { \
	236	log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
	237	} while (false)
	238
	239	#if defined(static_assert)
	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
	247	#else
	248	#define assert_cc(expr) \
	249	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
	250	struct CONCATENATE(_assert_struct_, __COUNTER__) { \
	251	char x[(expr) ? 0 : -1]; \
	252	}; \
	253	REENABLE_WARNING
	254	#endif
	255
	256	#define assert_log(expr, message) ((_likely_(expr)) \
	257	? (true) \
	258	: (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
	259
	260	#define assert_return(expr, r) \
	261	do { \
	262	if (!assert_log(expr, #expr)) \
	263	return (r); \
	264	} while (false)
	265
	266	#define assert_return_errno(expr, r, err) \
	267	do { \
	268	if (!assert_log(expr, #expr)) { \
	269	errno = err; \
	270	return (r); \
	271	} \
	272	} while (false)
	273
	274	#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
	275	#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
	276	#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
	277	#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	278
	279	#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
	280	#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
	281	#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
	282	#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	283
	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)))
	288
	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)))
	293
	294	#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
	295	#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	296
	297	#define memzero(x,l) (memset((x), 0, (l)))
	298	#define zero(x) (memzero(&(x), sizeof(x)))
	299
	300	#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
	301
	302	#define char_array_0(x) x[sizeof(x)-1] = 0;
	303
	304	#define VA_FORMAT_ADVANCE(format, ap) \
	305	do { \
	306	int _argtypes[128]; \
	307	size_t _i, _k; \
	308	_k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
	309	assert(_k < ELEMENTSOF(_argtypes)); \
	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
	349	/* Because statfs.t_type can be int on some architectures, we have to cast
	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	*/
	353	#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
	354
	355	/* Returns the number of chars needed to format variables of the
	356	* specified type as a decimal string. Adds in extra space for a
	357	* negative '-' prefix (hence works correctly on signed
	358	* types). Includes space for the trailing NUL. */
	359	#define DECIMAL_STR_MAX(type) \
	360	(2+(sizeof(type) <= 1 ? 3 : \
	361	sizeof(type) <= 2 ? 5 : \
	362	sizeof(type) <= 4 ? 10 : \
	363	sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
	364
	365	#define SET_FLAG(v, flag, b) \
	366	(v) = (b) ? ((v) \| (flag)) : ((v) & ~(flag))
	367
	368	#define IN_SET(x, y, ...) \
	369	({ \
	370	static const typeof(y) _array[] = { (y), __VA_ARGS__ }; \
	371	const typeof(y) _x = (x); \
	372	unsigned _i; \
	373	bool _found = false; \
	374	for (_i = 0; _i < ELEMENTSOF(_array); _i++) \
	375	if (_array[_i] == _x) { \
	376	_found = true; \
	377	break; \
	378	} \
	379	_found; \
	380	})
	381
	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
	397	/* Define C11 thread_local attribute even on older gcc compiler
	398	* version */
	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
	410
	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
	421	#define MODE_INVALID ((mode_t) -1)
	422
	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
	430	#include "log.h"