[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)

#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) (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) __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)                                        \
        __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
fb835651 DH	82	#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
	83	#define UNIQ __COUNTER__
	84
60918275	85	/* Rounds up */
9be9c7cf LP	86
	87	#define ALIGN4(l) (((l) + 3) & ~3)
	88	#define ALIGN8(l) (((l) + 7) & ~7)
	89
	90	#if __SIZEOF_POINTER__ == 8
	91	#define ALIGN(l) ALIGN8(l)
	92	#elif __SIZEOF_POINTER__ == 4
	93	#define ALIGN(l) ALIGN4(l)
	94	#else
	95	#error "Wut? Pointers are neither 4 nor 8 bytes long?"
	96	#endif
	97
49aa47c7 LP	98	#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
49aa47c7 LP	99	#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
e86b80b8 LP	100	#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
e86b80b8 LP	101
37f85e66	102	static inline size_t ALIGN_TO(size_t l, size_t ali) {
37f85e66	103	return ((l + ali - 1) & ~(ali - 1));
22be093f LP	104	}
22be093f LP	105
1c231f56	106	#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p, ali))
49aa47c7	107
625e870b DH	108	/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
	109	static inline unsigned long ALIGN_POWER2(unsigned long u) {
	110	/* clz(0) is undefined */
	111	if (u == 1)
	112	return 1;
	113
	114	/* left-shift overflow is undefined */
	115	if (__builtin_clzl(u - 1UL) < 1)
	116	return 0;
	117
	118	return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
	119	}
	120
60918275 LP	121	#define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
60918275 LP	122
bbc98d32 KS	123	/*
	124	* container_of - cast a member of a structure out to the containing structure
	125	* @ptr: the pointer to the member.
	126	* @type: the type of the container struct this is embedded in.
	127	* @member: the name of the member within the struct.
bbc98d32	128	*/
fb835651 DH	129	#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
fb835651 DH	130	#define __container_of(uniq, ptr, type, member) \
fa70beaa	131	__extension__ ({ \
fb835651 DH	132	const typeof( ((type)0)->member ) UNIQ_T(A, uniq) = (ptr); \
	133	(type)( (char )UNIQ_T(A, uniq) - offsetof(type,member) ); \
	134	})
bbc98d32	135
9607d947	136	#undef MAX
fdcba430 DH	137	#define MAX(a,b) \
	138	__extension__ ({ \
	139	const typeof(a) _a = (a); \
	140	const typeof(b) _b = (b); \
	141	_a > _b ? _a : _b; \
60918275 LP	142	})
60918275 LP	143
7242d742 DH	144	/* evaluates to (void) if _A or _B are not constant or of different types */
	145	#define CONST_MAX(_A, _B) \
	146	__extension__ (__builtin_choose_expr( \
	147	__builtin_constant_p(_A) && \
	148	__builtin_constant_p(_B) && \
	149	__builtin_types_compatible_p(typeof(_A), typeof(_B)), \
	150	((_A) > (_B)) ? (_A) : (_B), \
	151	(void)0))
	152
40a1eebd DH	153	/* takes two types and returns the size of the larger one */
	154	#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
	155
fdcba430 DH	156	#define MAX3(x,y,z) \
	157	__extension__ ({ \
	158	const typeof(x) _c = MAX(x,y); \
	159	MAX(_c, z); \
9607d947	160	})
3b63d2d3	161
9607d947	162	#undef MIN
fdcba430 DH	163	#define MIN(a,b) \
	164	__extension__ ({ \
	165	const typeof(a) _a = (a); \
	166	const typeof(b) _b = (b); \
	167	_a < _b ? _a : _b; \
60918275 LP	168	})
60918275 LP	169
fdcba430 DH	170	#define MIN3(x,y,z) \
	171	__extension__ ({ \
	172	const typeof(x) _c = MIN(x,y); \
	173	MIN(_c, z); \
7df23077 DH	174	})
7df23077 DH	175
fdcba430 DH	176	#define LESS_BY(A,B) \
	177	__extension__ ({ \
	178	const typeof(A) _A = (A); \
	179	const typeof(B) _B = (B); \
	180	_A > _B ? _A - _B : 0; \
348ced90 ZJS	181	})
348ced90 ZJS	182
907809fc	183	#ifndef CLAMP
60918275 LP	184	#define CLAMP(x, low, high) \
60918275 LP	185	__extension__ ({ \
fdcba430 DH	186	const typeof(x) _x = (x); \
	187	const typeof(low) _low = (low); \
	188	const typeof(high) _high = (high); \
60918275 LP	189	((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
60918275 LP	190	})
907809fc	191	#endif
60918275	192
dd8f71ee LP	193	#define assert_se(expr) \
dd8f71ee LP	194	do { \
93a46b0b	195	if (_unlikely_(!(expr))) \
b7f33638	196	log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee LP	197	} while (false) \
	198
	199	/* We override the glibc assert() here. */
	200	#undef assert
	201	#ifdef NDEBUG
	202	#define assert(expr) do {} while(false)
	203	#else
	204	#define assert(expr) assert_se(expr)
	205	#endif
60918275	206
dd8f71ee LP	207	#define assert_not_reached(t) \
dd8f71ee LP	208	do { \
b7f33638	209	log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee	210	} while (false)
60918275	211
f791c684	212	#if defined(static_assert)
7ebe131a LP	213	/* static_assert() is sometimes defined in a way that trips up
	214	* -Wdeclaration-after-statement, hence let's temporarily turn off
	215	* this warning around it. */
	216	#define assert_cc(expr) \
	217	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
	218	static_assert(expr, #expr); \
	219	REENABLE_WARNING
f791c684	220	#else
7ebe131a LP	221	#define assert_cc(expr) \
7ebe131a LP	222	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
418bcb0c	223	struct CONCATENATE(_assert_struct_, __LINE__) { \
7ebe131a LP	224	char x[(expr) ? 0 : -1]; \
	225	}; \
	226	REENABLE_WARNING
f791c684	227	#endif
60918275	228
80514f9c LP	229	#define assert_return(expr, r) \
	230	do { \
	231	if (_unlikely_(!(expr))) { \
	232	log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
	233	return (r); \
	234	} \
18387b59 LP	235	} while (false)
18387b59 LP	236
a3dc3547 KS	237	#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
a3dc3547 KS	238	#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
60918275	239	#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
a3dc3547	240	#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	241
a3dc3547 KS	242	#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
a3dc3547 KS	243	#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
c6c18be3	244	#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
a3dc3547	245	#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	246
a3dc3547 KS	247	#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
	248	#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
	249	#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
	250	#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	251
a3dc3547 KS	252	#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
	253	#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
	254	#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
	255	#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	256
74b2466e LP	257	#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
	258	#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	259
476fe607 LP	260	#define memzero(x,l) (memset((x), 0, (l)))
	261	#define zero(x) (memzero(&(x), sizeof(x)))
	262
a9c55a88 LP	263	#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
a9c55a88 LP	264
034c6ed7 LP	265	#define char_array_0(x) x[sizeof(x)-1] = 0;
034c6ed7 LP	266
bff7c062	267	#define IOVEC_SET_STRING(i, s) \
2fa086a8	268	do { \
bff7c062 LP	269	struct iovec *_i = &(i); \
	270	char _s = (char )(s); \
	271	_i->iov_base = _s; \
	272	_i->iov_len = strlen(_s); \
9b3c575e	273	} while(false)
2fa086a8	274
c31e1495 LP	275	static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
	276	unsigned j;
	277	size_t r = 0;
	278
	279	for (j = 0; j < n; j++)
	280	r += i[j].iov_len;
	281
	282	return r;
	283	}
	284
	285	static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
	286	unsigned j;
	287
	288	for (j = 0; j < n; j++) {
	289	size_t sub;
	290
	291	if (_unlikely_(k <= 0))
	292	break;
	293
	294	sub = MIN(i[j].iov_len, k);
	295	i[j].iov_len -= sub;
	296	i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
	297	k -= sub;
	298	}
	299
	300	return k;
	301	}
	302
cecd32f6 LP	303	#define VA_FORMAT_ADVANCE(format, ap) \
	304	do { \
	305	int _argtypes[128]; \
963ddb91 LP	306	size_t _i, _k; \
963ddb91 LP	307	_k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
cecd32f6	308	assert(_k < ELEMENTSOF(_argtypes)); \
963ddb91 LP	309	for (_i = 0; _i < _k; _i++) { \
	310	if (_argtypes[_i] & PA_FLAG_PTR) { \
	311	(void) va_arg(ap, void*); \
	312	continue; \
	313	} \
	314	\
	315	switch (_argtypes[_i]) { \
	316	case PA_INT: \
	317	case PA_INT\|PA_FLAG_SHORT: \
	318	case PA_CHAR: \
	319	(void) va_arg(ap, int); \
	320	break; \
	321	case PA_INT\|PA_FLAG_LONG: \
	322	(void) va_arg(ap, long int); \
	323	break; \
	324	case PA_INT\|PA_FLAG_LONG_LONG: \
	325	(void) va_arg(ap, long long int); \
	326	break; \
	327	case PA_WCHAR: \
	328	(void) va_arg(ap, wchar_t); \
	329	break; \
	330	case PA_WSTRING: \
	331	case PA_STRING: \
	332	case PA_POINTER: \
	333	(void) va_arg(ap, void*); \
	334	break; \
	335	case PA_FLOAT: \
	336	case PA_DOUBLE: \
	337	(void) va_arg(ap, double); \
	338	break; \
	339	case PA_DOUBLE\|PA_FLAG_LONG_DOUBLE: \
	340	(void) va_arg(ap, long double); \
	341	break; \
	342	default: \
	343	assert_not_reached("Unknown format string argument."); \
	344	} \
	345	} \
	346	} while(false)
	347
e5f476db	348	/* Because statfs.t_type can be int on some architectures, we have to cast
bdd29249 HH	349	* the const magic to the type, otherwise the compiler warns about
	350	* signed/unsigned comparison, because the magic can be 32 bit unsigned.
	351	*/
c51cf056	352	#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
bdd29249	353
fa70beaa LP	354	/* Returns the number of chars needed to format variables of the
	355	* specified type as a decimal string. Adds in extra space for a
	356	* negative '-' prefix. */
fa70beaa	357	#define DECIMAL_STR_MAX(type) \
5bcb0f2b	358	(2+(sizeof(type) <= 1 ? 3 : \
fa70beaa LP	359	sizeof(type) <= 2 ? 5 : \
	360	sizeof(type) <= 4 ? 10 : \
	361	sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
	362
264ad849 LP	363	#define SET_FLAG(v, flag, b) \
	364	(v) = (b) ? ((v) \| (flag)) : ((v) & ~(flag))
	365
dc36d78e	366	#define IN_SET(x, y, ...) \
059d9fbb	367	({ \
dc36d78e LP	368	const typeof(y) _y = (y); \
dc36d78e LP	369	const typeof(_y) _x = (x); \
059d9fbb LP	370	unsigned _i; \
059d9fbb LP	371	bool _found = false; \
dc36d78e LP	372	for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
dc36d78e LP	373	if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
059d9fbb LP	374	_found = true; \
	375	break; \
	376	} \
	377	_found; \
cabb7806 LP	378	})
cabb7806 LP	379
919ce0b7 SL	380	/* Define C11 thread_local attribute even on older gcc compiler
919ce0b7 SL	381	* version */
ec202eae SL	382	#ifndef thread_local
	383	/*
	384	* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
	385	* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
	386	*/
	387	#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) \|\| (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
	388	#define thread_local _Thread_local
	389	#else
	390	#define thread_local __thread
	391	#endif
	392	#endif
cabb7806	393
919ce0b7 SL	394	/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
	395	* compiler versions */
	396	#ifndef noreturn
	397	#if __STDC_VERSION__ >= 201112L
	398	#define noreturn _Noreturn
	399	#else
	400	#define noreturn __attribute__((noreturn))
	401	#endif
	402	#endif
	403
dd8f71ee	404	#include "log.h"