[thirdparty/systemd.git] / src / shared / 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 <sys/param.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <inttypes.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 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)

/* 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) (sizeof(x)/sizeof((x)[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)                                 \
        __extension__ ({                                                \
                        const typeof( ((type *)0)->member ) *__mptr = (ptr); \
                        (type *)( (char *)__mptr - offsetof(type,member) ); \
                })

#undef MAX
#define MAX(a,b)                                        \
        __extension__ ({                                \
                        const typeof(a) _a = (a);       \
                        const typeof(b) _b = (b);       \
                        _a > _b ? _a : _b;              \
                })

/* 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)                                        \
        __extension__ ({                                \
                        const typeof(a) _a = (a);       \
                        const typeof(b) _b = (b);       \
                        _a < _b ? _a : _b;              \
                })

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

#define LESS_BY(A,B)                                    \
        __extension__ ({                                \
                        const typeof(A) _A = (A);       \
                        const typeof(B) _B = (B);       \
                        _A > _B ? _A - _B : 0;          \
                })

#ifndef CLAMP
#define CLAMP(x, low, high)                                             \
        __extension__ ({                                                \
                        const typeof(x) _x = (x);                       \
                        const typeof(low) _low = (low);                 \
                        const typeof(high) _high = (high);              \
                        ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
                })
#endif

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

/* We override the glibc assert() here. */
#undef assert
#ifdef NDEBUG
#define assert(expr) do {} while(false)
#else
#define assert(expr) assert_se(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_, __LINE__) {                 \
                char x[(expr) ? 0 : -1];                                \
        };                                                              \
        REENABLE_WARNING
#endif

#define assert_return(expr, r)                                          \
        do {                                                            \
                if (_unlikely_(!(expr))) {                              \
                        log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
                        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 IOVEC_SET_STRING(i, s)                  \
        do {                                    \
                struct iovec *_i = &(i);        \
                char *_s = (char *)(s);         \
                _i->iov_base = _s;              \
                _i->iov_len = strlen(_s);       \
        } while(false)

static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
        unsigned j;
        size_t r = 0;

        for (j = 0; j < n; j++)
                r += i[j].iov_len;

        return r;
}

static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
        unsigned j;

        for (j = 0; j < n; j++) {
                size_t sub;

                if (_unlikely_(k <= 0))
                        break;

                sub = MIN(i[j].iov_len, k);
                i[j].iov_len -= sub;
                i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
                k -= sub;
        }

        return k;
}

#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. */
#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, ...)                                               \
        ({                                                              \
                const typeof(y) _y = (y);                               \
                const typeof(_y) _x = (x);                              \
                unsigned _i;                                            \
                bool _found = false;                                    \
                for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
                        if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
                                _found = true;                          \
                                break;                                  \
                        }                                               \
                _found;                                                 \
        })

/* 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

#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>
6a39419f	25	#include <sys/param.h>
60918275	26	#include <sys/types.h>
c31e1495 LP	27	#include <sys/uio.h>
c31e1495 LP	28	#include <inttypes.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
7ebe131a LP	70	#define REENABLE_WARNING \
	71	_Pragma("GCC diagnostic pop")
	72
49e5de64 ZJS	73	/* automake test harness */
	74	#define EXIT_TEST_SKIP 77
	75
bef2733f LP	76	#define XSTRINGIFY(x) #x
	77	#define STRINGIFY(x) XSTRINGIFY(x)
	78
ab9cbe34 LS	79	#define XCONCATENATE(x, y) x ## y
	80	#define CONCATENATE(x, y) XCONCATENATE(x, y)
	81
60918275	82	/* Rounds up */
9be9c7cf LP	83
	84	#define ALIGN4(l) (((l) + 3) & ~3)
	85	#define ALIGN8(l) (((l) + 7) & ~7)
	86
	87	#if __SIZEOF_POINTER__ == 8
	88	#define ALIGN(l) ALIGN8(l)
	89	#elif __SIZEOF_POINTER__ == 4
	90	#define ALIGN(l) ALIGN4(l)
	91	#else
	92	#error "Wut? Pointers are neither 4 nor 8 bytes long?"
	93	#endif
	94
49aa47c7 LP	95	#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
49aa47c7 LP	96	#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
e86b80b8 LP	97	#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
e86b80b8 LP	98
37f85e66	99	static inline size_t ALIGN_TO(size_t l, size_t ali) {
37f85e66	100	return ((l + ali - 1) & ~(ali - 1));
22be093f LP	101	}
22be093f LP	102
1c231f56	103	#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p, ali))
49aa47c7	104
625e870b DH	105	/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
	106	static inline unsigned long ALIGN_POWER2(unsigned long u) {
	107	/* clz(0) is undefined */
	108	if (u == 1)
	109	return 1;
	110
	111	/* left-shift overflow is undefined */
	112	if (__builtin_clzl(u - 1UL) < 1)
	113	return 0;
	114
	115	return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
	116	}
	117
60918275 LP	118	#define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
60918275 LP	119
bbc98d32 KS	120	/*
	121	* container_of - cast a member of a structure out to the containing structure
	122	* @ptr: the pointer to the member.
	123	* @type: the type of the container struct this is embedded in.
	124	* @member: the name of the member within the struct.
	125	*
	126	*/
fa70beaa LP	127	#define container_of(ptr, type, member) \
	128	__extension__ ({ \
	129	const typeof( ((type )0)->member ) __mptr = (ptr); \
	130	(type )( (char )__mptr - offsetof(type,member) ); \
	131	})
bbc98d32	132
9607d947	133	#undef MAX
fdcba430 DH	134	#define MAX(a,b) \
	135	__extension__ ({ \
	136	const typeof(a) _a = (a); \
	137	const typeof(b) _b = (b); \
	138	_a > _b ? _a : _b; \
60918275 LP	139	})
60918275 LP	140
7242d742 DH	141	/* evaluates to (void) if _A or _B are not constant or of different types */
	142	#define CONST_MAX(_A, _B) \
	143	__extension__ (__builtin_choose_expr( \
	144	__builtin_constant_p(_A) && \
	145	__builtin_constant_p(_B) && \
	146	__builtin_types_compatible_p(typeof(_A), typeof(_B)), \
	147	((_A) > (_B)) ? (_A) : (_B), \
	148	(void)0))
	149
40a1eebd DH	150	/* takes two types and returns the size of the larger one */
	151	#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
	152
fdcba430 DH	153	#define MAX3(x,y,z) \
	154	__extension__ ({ \
	155	const typeof(x) _c = MAX(x,y); \
	156	MAX(_c, z); \
9607d947	157	})
3b63d2d3	158
9607d947	159	#undef MIN
fdcba430 DH	160	#define MIN(a,b) \
	161	__extension__ ({ \
	162	const typeof(a) _a = (a); \
	163	const typeof(b) _b = (b); \
	164	_a < _b ? _a : _b; \
60918275 LP	165	})
60918275 LP	166
fdcba430 DH	167	#define MIN3(x,y,z) \
	168	__extension__ ({ \
	169	const typeof(x) _c = MIN(x,y); \
	170	MIN(_c, z); \
7df23077 DH	171	})
7df23077 DH	172
fdcba430 DH	173	#define LESS_BY(A,B) \
	174	__extension__ ({ \
	175	const typeof(A) _A = (A); \
	176	const typeof(B) _B = (B); \
	177	_A > _B ? _A - _B : 0; \
348ced90 ZJS	178	})
348ced90 ZJS	179
907809fc	180	#ifndef CLAMP
60918275 LP	181	#define CLAMP(x, low, high) \
60918275 LP	182	__extension__ ({ \
fdcba430 DH	183	const typeof(x) _x = (x); \
	184	const typeof(low) _low = (low); \
	185	const typeof(high) _high = (high); \
60918275 LP	186	((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
60918275 LP	187	})
907809fc	188	#endif
60918275	189
dd8f71ee LP	190	#define assert_se(expr) \
dd8f71ee LP	191	do { \
93a46b0b	192	if (_unlikely_(!(expr))) \
b7f33638	193	log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee LP	194	} while (false) \
	195
	196	/* We override the glibc assert() here. */
	197	#undef assert
	198	#ifdef NDEBUG
	199	#define assert(expr) do {} while(false)
	200	#else
	201	#define assert(expr) assert_se(expr)
	202	#endif
60918275	203
dd8f71ee LP	204	#define assert_not_reached(t) \
dd8f71ee LP	205	do { \
b7f33638	206	log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee	207	} while (false)
60918275	208
f791c684	209	#if defined(static_assert)
7ebe131a LP	210	/* static_assert() is sometimes defined in a way that trips up
	211	* -Wdeclaration-after-statement, hence let's temporarily turn off
	212	* this warning around it. */
	213	#define assert_cc(expr) \
	214	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
	215	static_assert(expr, #expr); \
	216	REENABLE_WARNING
f791c684	217	#else
7ebe131a LP	218	#define assert_cc(expr) \
7ebe131a LP	219	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
418bcb0c	220	struct CONCATENATE(_assert_struct_, __LINE__) { \
7ebe131a LP	221	char x[(expr) ? 0 : -1]; \
	222	}; \
	223	REENABLE_WARNING
f791c684	224	#endif
60918275	225
80514f9c LP	226	#define assert_return(expr, r) \
	227	do { \
	228	if (_unlikely_(!(expr))) { \
	229	log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
	230	return (r); \
	231	} \
18387b59 LP	232	} while (false)
18387b59 LP	233
a3dc3547 KS	234	#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
a3dc3547 KS	235	#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
60918275	236	#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
a3dc3547	237	#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	238
a3dc3547 KS	239	#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
a3dc3547 KS	240	#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
c6c18be3	241	#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
a3dc3547	242	#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	243
a3dc3547 KS	244	#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
	245	#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
	246	#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
	247	#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	248
a3dc3547 KS	249	#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
	250	#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
	251	#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
	252	#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	253
74b2466e LP	254	#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
	255	#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	256
476fe607 LP	257	#define memzero(x,l) (memset((x), 0, (l)))
	258	#define zero(x) (memzero(&(x), sizeof(x)))
	259
a9c55a88 LP	260	#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
a9c55a88 LP	261
034c6ed7 LP	262	#define char_array_0(x) x[sizeof(x)-1] = 0;
034c6ed7 LP	263
bff7c062	264	#define IOVEC_SET_STRING(i, s) \
2fa086a8	265	do { \
bff7c062 LP	266	struct iovec *_i = &(i); \
	267	char _s = (char )(s); \
	268	_i->iov_base = _s; \
	269	_i->iov_len = strlen(_s); \
9b3c575e	270	} while(false)
2fa086a8	271
c31e1495 LP	272	static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
	273	unsigned j;
	274	size_t r = 0;
	275
	276	for (j = 0; j < n; j++)
	277	r += i[j].iov_len;
	278
	279	return r;
	280	}
	281
	282	static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
	283	unsigned j;
	284
	285	for (j = 0; j < n; j++) {
	286	size_t sub;
	287
	288	if (_unlikely_(k <= 0))
	289	break;
	290
	291	sub = MIN(i[j].iov_len, k);
	292	i[j].iov_len -= sub;
	293	i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
	294	k -= sub;
	295	}
	296
	297	return k;
	298	}
	299
cecd32f6 LP	300	#define VA_FORMAT_ADVANCE(format, ap) \
	301	do { \
	302	int _argtypes[128]; \
963ddb91 LP	303	size_t _i, _k; \
963ddb91 LP	304	_k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
cecd32f6	305	assert(_k < ELEMENTSOF(_argtypes)); \
963ddb91 LP	306	for (_i = 0; _i < _k; _i++) { \
	307	if (_argtypes[_i] & PA_FLAG_PTR) { \
	308	(void) va_arg(ap, void*); \
	309	continue; \
	310	} \
	311	\
	312	switch (_argtypes[_i]) { \
	313	case PA_INT: \
	314	case PA_INT\|PA_FLAG_SHORT: \
	315	case PA_CHAR: \
	316	(void) va_arg(ap, int); \
	317	break; \
	318	case PA_INT\|PA_FLAG_LONG: \
	319	(void) va_arg(ap, long int); \
	320	break; \
	321	case PA_INT\|PA_FLAG_LONG_LONG: \
	322	(void) va_arg(ap, long long int); \
	323	break; \
	324	case PA_WCHAR: \
	325	(void) va_arg(ap, wchar_t); \
	326	break; \
	327	case PA_WSTRING: \
	328	case PA_STRING: \
	329	case PA_POINTER: \
	330	(void) va_arg(ap, void*); \
	331	break; \
	332	case PA_FLOAT: \
	333	case PA_DOUBLE: \
	334	(void) va_arg(ap, double); \
	335	break; \
	336	case PA_DOUBLE\|PA_FLAG_LONG_DOUBLE: \
	337	(void) va_arg(ap, long double); \
	338	break; \
	339	default: \
	340	assert_not_reached("Unknown format string argument."); \
	341	} \
	342	} \
	343	} while(false)
	344
e5f476db	345	/* Because statfs.t_type can be int on some architectures, we have to cast
bdd29249 HH	346	* the const magic to the type, otherwise the compiler warns about
	347	* signed/unsigned comparison, because the magic can be 32 bit unsigned.
	348	*/
c51cf056	349	#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
bdd29249	350
fa70beaa LP	351	/* Returns the number of chars needed to format variables of the
	352	* specified type as a decimal string. Adds in extra space for a
	353	* negative '-' prefix. */
fa70beaa	354	#define DECIMAL_STR_MAX(type) \
5bcb0f2b	355	(2+(sizeof(type) <= 1 ? 3 : \
fa70beaa LP	356	sizeof(type) <= 2 ? 5 : \
	357	sizeof(type) <= 4 ? 10 : \
	358	sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
	359
264ad849 LP	360	#define SET_FLAG(v, flag, b) \
	361	(v) = (b) ? ((v) \| (flag)) : ((v) & ~(flag))
	362
dc36d78e	363	#define IN_SET(x, y, ...) \
059d9fbb	364	({ \
dc36d78e LP	365	const typeof(y) _y = (y); \
dc36d78e LP	366	const typeof(_y) _x = (x); \
059d9fbb LP	367	unsigned _i; \
059d9fbb LP	368	bool _found = false; \
dc36d78e LP	369	for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
dc36d78e LP	370	if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
059d9fbb LP	371	_found = true; \
	372	break; \
	373	} \
	374	_found; \
cabb7806 LP	375	})
cabb7806 LP	376
919ce0b7 SL	377	/* Define C11 thread_local attribute even on older gcc compiler
919ce0b7 SL	378	* version */
ec202eae SL	379	#ifndef thread_local
	380	/*
	381	* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
	382	* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
	383	*/
	384	#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) \|\| (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
	385	#define thread_local _Thread_local
	386	#else
	387	#define thread_local __thread
	388	#endif
	389	#endif
cabb7806	390
919ce0b7 SL	391	/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
	392	* compiler versions */
	393	#ifndef noreturn
	394	#if __STDC_VERSION__ >= 201112L
	395	#define noreturn _Noreturn
	396	#else
	397	#define noreturn __attribute__((noreturn))
	398	#endif
	399	#endif
	400
dd8f71ee	401	#include "log.h"