[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 <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 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) (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) __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_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_, __COUNTER__) {              \
                char x[(expr) ? 0 : -1];                                \
        };                                                              \
        REENABLE_WARNING
#endif

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

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

#define assert_return_errno(expr, r, err)                               \
        do {                                                            \
                if (!assert_log(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)))

/* The following macros add 1 when converting things, since UID 0 is a
 * valid UID, while the pointer NULL is special */
#define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1))
#define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))

#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))

#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 (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, ...)                                               \
        ({                                                              \
                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;                                                 \
        })

/* 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 UID_INVALID ((uid_t) -1)
#define GID_INVALID ((gid_t) -1)
#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__

#define CMSG_FOREACH(cmsg, mh)                                          \
        for ((cmsg) = CMSG_FIRSTHDR(mh); (cmsg); (cmsg) = CMSG_NXTHDR((mh), (cmsg)))

#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
df99a9ef ZJS	70	#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
	71	_Pragma("GCC diagnostic push"); \
	72	_Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
	73
7ebe131a LP	74	#define REENABLE_WARNING \
	75	_Pragma("GCC diagnostic pop")
	76
49e5de64 ZJS	77	/* automake test harness */
	78	#define EXIT_TEST_SKIP 77
	79
bef2733f LP	80	#define XSTRINGIFY(x) #x
	81	#define STRINGIFY(x) XSTRINGIFY(x)
	82
ab9cbe34 LS	83	#define XCONCATENATE(x, y) x ## y
	84	#define CONCATENATE(x, y) XCONCATENATE(x, y)
	85
fb835651 DH	86	#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
	87	#define UNIQ __COUNTER__
	88
60918275	89	/* Rounds up */
9be9c7cf LP	90
	91	#define ALIGN4(l) (((l) + 3) & ~3)
	92	#define ALIGN8(l) (((l) + 7) & ~7)
	93
	94	#if __SIZEOF_POINTER__ == 8
	95	#define ALIGN(l) ALIGN8(l)
	96	#elif __SIZEOF_POINTER__ == 4
	97	#define ALIGN(l) ALIGN4(l)
	98	#else
	99	#error "Wut? Pointers are neither 4 nor 8 bytes long?"
	100	#endif
	101
5f86c1f4 LP	102	#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
	103	#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
	104	#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
e86b80b8	105
37f85e66	106	static inline size_t ALIGN_TO(size_t l, size_t ali) {
37f85e66	107	return ((l + ali - 1) & ~(ali - 1));
22be093f LP	108	}
22be093f LP	109
5f86c1f4	110	#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
49aa47c7	111
625e870b DH	112	/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
	113	static inline unsigned long ALIGN_POWER2(unsigned long u) {
	114	/* clz(0) is undefined */
	115	if (u == 1)
	116	return 1;
	117
	118	/* left-shift overflow is undefined */
	119	if (__builtin_clzl(u - 1UL) < 1)
	120	return 0;
	121
	122	return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
	123	}
	124
60918275 LP	125	#define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
60918275 LP	126
bbc98d32 KS	127	/*
	128	* container_of - cast a member of a structure out to the containing structure
	129	* @ptr: the pointer to the member.
	130	* @type: the type of the container struct this is embedded in.
	131	* @member: the name of the member within the struct.
bbc98d32	132	*/
fb835651 DH	133	#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
fb835651 DH	134	#define __container_of(uniq, ptr, type, member) \
fa70beaa	135	__extension__ ({ \
fb835651 DH	136	const typeof( ((type)0)->member ) UNIQ_T(A, uniq) = (ptr); \
	137	(type)( (char )UNIQ_T(A, uniq) - offsetof(type,member) ); \
	138	})
bbc98d32	139
9607d947	140	#undef MAX
667a0377 DH	141	#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
667a0377 DH	142	#define __MAX(aq, a, bq, b) \
fdcba430	143	__extension__ ({ \
667a0377 DH	144	const typeof(a) UNIQ_T(A, aq) = (a); \
	145	const typeof(b) UNIQ_T(B, bq) = (b); \
	146	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	147	})
60918275	148
7242d742 DH	149	/* evaluates to (void) if _A or _B are not constant or of different types */
	150	#define CONST_MAX(_A, _B) \
	151	__extension__ (__builtin_choose_expr( \
	152	__builtin_constant_p(_A) && \
	153	__builtin_constant_p(_B) && \
	154	__builtin_types_compatible_p(typeof(_A), typeof(_B)), \
	155	((_A) > (_B)) ? (_A) : (_B), \
	156	(void)0))
	157
40a1eebd DH	158	/* takes two types and returns the size of the larger one */
	159	#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
	160
fdcba430 DH	161	#define MAX3(x,y,z) \
	162	__extension__ ({ \
	163	const typeof(x) _c = MAX(x,y); \
	164	MAX(_c, z); \
9607d947	165	})
3b63d2d3	166
9607d947	167	#undef MIN
667a0377 DH	168	#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
667a0377 DH	169	#define __MIN(aq, a, bq, b) \
fdcba430	170	__extension__ ({ \
667a0377 DH	171	const typeof(a) UNIQ_T(A, aq) = (a); \
	172	const typeof(b) UNIQ_T(B, bq) = (b); \
	173	UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	174	})
60918275	175
fdcba430 DH	176	#define MIN3(x,y,z) \
	177	__extension__ ({ \
	178	const typeof(x) _c = MIN(x,y); \
	179	MIN(_c, z); \
7df23077 DH	180	})
7df23077 DH	181
667a0377 DH	182	#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
667a0377 DH	183	#define __LESS_BY(aq, a, bq, b) \
fdcba430	184	__extension__ ({ \
667a0377 DH	185	const typeof(a) UNIQ_T(A, aq) = (a); \
	186	const typeof(b) UNIQ_T(B, bq) = (b); \
	187	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
	188	})
348ced90	189
667a0377 DH	190	#undef CLAMP
	191	#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
	192	#define __CLAMP(xq, x, lowq, low, highq, high) \
60918275	193	__extension__ ({ \
667a0377 DH	194	const typeof(x) UNIQ_T(X,xq) = (x); \
	195	const typeof(low) UNIQ_T(LOW,lowq) = (low); \
	196	const typeof(high) UNIQ_T(HIGH,highq) = (high); \
	197	UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \
	198	UNIQ_T(HIGH,highq) : \
	199	UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \
	200	UNIQ_T(LOW,lowq) : \
	201	UNIQ_T(X,xq); \
	202	})
60918275	203
180a60bc DH	204	/* [(x + y - 1) / y] suffers from an integer overflow, even though the
	205	* computation should be possible in the given type. Therefore, we use
	206	* [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
	207	* quotient and the remainder, so both should be equally fast. */
	208	#define DIV_ROUND_UP(_x, _y) \
	209	__extension__ ({ \
	210	const typeof(_x) __x = (_x); \
	211	const typeof(_y) __y = (_y); \
	212	(__x / __y + !!(__x % __y)); \
	213	})
	214
dd8f71ee LP	215	#define assert_se(expr) \
dd8f71ee LP	216	do { \
93a46b0b	217	if (_unlikely_(!(expr))) \
b7f33638	218	log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee LP	219	} while (false) \
	220
	221	/* We override the glibc assert() here. */
	222	#undef assert
	223	#ifdef NDEBUG
	224	#define assert(expr) do {} while(false)
	225	#else
	226	#define assert(expr) assert_se(expr)
	227	#endif
60918275	228
dd8f71ee LP	229	#define assert_not_reached(t) \
dd8f71ee LP	230	do { \
b7f33638	231	log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee	232	} while (false)
60918275	233
f791c684	234	#if defined(static_assert)
7ebe131a LP	235	/* static_assert() is sometimes defined in a way that trips up
	236	* -Wdeclaration-after-statement, hence let's temporarily turn off
	237	* this warning around it. */
	238	#define assert_cc(expr) \
	239	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
	240	static_assert(expr, #expr); \
	241	REENABLE_WARNING
f791c684	242	#else
7ebe131a LP	243	#define assert_cc(expr) \
7ebe131a LP	244	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
6825a04d	245	struct CONCATENATE(_assert_struct_, __COUNTER__) { \
7ebe131a LP	246	char x[(expr) ? 0 : -1]; \
	247	}; \
	248	REENABLE_WARNING
f791c684	249	#endif
60918275	250
366e6411 DH	251	#define assert_log(expr) ((_likely_(expr)) \
	252	? (true) \
	253	: (log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
	254
80514f9c LP	255	#define assert_return(expr, r) \
80514f9c LP	256	do { \
366e6411	257	if (!assert_log(expr)) \
80514f9c	258	return (r); \
18387b59 LP	259	} while (false)
18387b59 LP	260
aa029628 TG	261	#define assert_return_errno(expr, r, err) \
aa029628 TG	262	do { \
366e6411	263	if (!assert_log(expr)) { \
aa029628 TG	264	errno = err; \
	265	return (r); \
	266	} \
	267	} while (false)
	268
a3dc3547 KS	269	#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
a3dc3547 KS	270	#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
60918275	271	#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
a3dc3547	272	#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	273
a3dc3547 KS	274	#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
a3dc3547 KS	275	#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
c6c18be3	276	#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
a3dc3547	277	#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	278
a3dc3547 KS	279	#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
	280	#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
	281	#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
	282	#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	283
a3dc3547 KS	284	#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
	285	#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
	286	#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
	287	#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	288
74b2466e LP	289	#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
	290	#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	291
8cb4ab00 LP	292	/* The following macros add 1 when converting things, since UID 0 is a
	293	* valid UID, while the pointer NULL is special */
	294	#define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1))
	295	#define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
	296
	297	#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
	298	#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
	299
476fe607 LP	300	#define memzero(x,l) (memset((x), 0, (l)))
	301	#define zero(x) (memzero(&(x), sizeof(x)))
	302
a9c55a88 LP	303	#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
a9c55a88 LP	304
034c6ed7 LP	305	#define char_array_0(x) x[sizeof(x)-1] = 0;
034c6ed7 LP	306
bff7c062	307	#define IOVEC_SET_STRING(i, s) \
2fa086a8	308	do { \
bff7c062 LP	309	struct iovec *_i = &(i); \
	310	char _s = (char )(s); \
	311	_i->iov_base = _s; \
	312	_i->iov_len = strlen(_s); \
9b3c575e	313	} while(false)
2fa086a8	314
c31e1495 LP	315	static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
	316	unsigned j;
	317	size_t r = 0;
	318
	319	for (j = 0; j < n; j++)
	320	r += i[j].iov_len;
	321
	322	return r;
	323	}
	324
	325	static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
	326	unsigned j;
	327
	328	for (j = 0; j < n; j++) {
	329	size_t sub;
	330
	331	if (_unlikely_(k <= 0))
	332	break;
	333
	334	sub = MIN(i[j].iov_len, k);
	335	i[j].iov_len -= sub;
	336	i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
	337	k -= sub;
	338	}
	339
	340	return k;
	341	}
	342
cecd32f6 LP	343	#define VA_FORMAT_ADVANCE(format, ap) \
	344	do { \
	345	int _argtypes[128]; \
963ddb91 LP	346	size_t _i, _k; \
963ddb91 LP	347	_k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
cecd32f6	348	assert(_k < ELEMENTSOF(_argtypes)); \
963ddb91 LP	349	for (_i = 0; _i < _k; _i++) { \
	350	if (_argtypes[_i] & PA_FLAG_PTR) { \
	351	(void) va_arg(ap, void*); \
	352	continue; \
	353	} \
	354	\
	355	switch (_argtypes[_i]) { \
	356	case PA_INT: \
	357	case PA_INT\|PA_FLAG_SHORT: \
	358	case PA_CHAR: \
	359	(void) va_arg(ap, int); \
	360	break; \
	361	case PA_INT\|PA_FLAG_LONG: \
	362	(void) va_arg(ap, long int); \
	363	break; \
	364	case PA_INT\|PA_FLAG_LONG_LONG: \
	365	(void) va_arg(ap, long long int); \
	366	break; \
	367	case PA_WCHAR: \
	368	(void) va_arg(ap, wchar_t); \
	369	break; \
	370	case PA_WSTRING: \
	371	case PA_STRING: \
	372	case PA_POINTER: \
	373	(void) va_arg(ap, void*); \
	374	break; \
	375	case PA_FLOAT: \
	376	case PA_DOUBLE: \
	377	(void) va_arg(ap, double); \
	378	break; \
	379	case PA_DOUBLE\|PA_FLAG_LONG_DOUBLE: \
	380	(void) va_arg(ap, long double); \
	381	break; \
	382	default: \
	383	assert_not_reached("Unknown format string argument."); \
	384	} \
	385	} \
	386	} while(false)
	387
e5f476db	388	/* Because statfs.t_type can be int on some architectures, we have to cast
bdd29249 HH	389	* the const magic to the type, otherwise the compiler warns about
	390	* signed/unsigned comparison, because the magic can be 32 bit unsigned.
	391	*/
c51cf056	392	#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
bdd29249	393
fa70beaa LP	394	/* Returns the number of chars needed to format variables of the
fa70beaa LP	395	* specified type as a decimal string. Adds in extra space for a
b7ce6b59 LP	396	* negative '-' prefix (hence works correctly on signed
b7ce6b59 LP	397	* types). Includes space for the trailing NUL. */
fa70beaa	398	#define DECIMAL_STR_MAX(type) \
5bcb0f2b	399	(2+(sizeof(type) <= 1 ? 3 : \
fa70beaa LP	400	sizeof(type) <= 2 ? 5 : \
	401	sizeof(type) <= 4 ? 10 : \
	402	sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
	403
264ad849 LP	404	#define SET_FLAG(v, flag, b) \
	405	(v) = (b) ? ((v) \| (flag)) : ((v) & ~(flag))
	406
dc36d78e	407	#define IN_SET(x, y, ...) \
059d9fbb	408	({ \
dc36d78e LP	409	const typeof(y) _y = (y); \
dc36d78e LP	410	const typeof(_y) _x = (x); \
059d9fbb LP	411	unsigned _i; \
059d9fbb LP	412	bool _found = false; \
dc36d78e LP	413	for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
dc36d78e LP	414	if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
059d9fbb LP	415	_found = true; \
	416	break; \
	417	} \
	418	_found; \
cabb7806 LP	419	})
cabb7806 LP	420
7f0a55d4 JT	421	/* Return a nulstr for a standard cascade of configuration directories,
	422	* suitable to pass to conf_files_list_nulstr or config_parse_many. */
	423	#define CONF_DIRS_NULSTR(n) \
	424	"/etc/" n ".d\0" \
	425	"/run/" n ".d\0" \
	426	"/usr/local/lib/" n ".d\0" \
	427	"/usr/lib/" n ".d\0" \
	428	CONF_DIR_SPLIT_USR(n)
	429
	430	#ifdef HAVE_SPLIT_USR
	431	#define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
	432	#else
	433	#define CONF_DIR_SPLIT_USR(n)
	434	#endif
	435
919ce0b7 SL	436	/* Define C11 thread_local attribute even on older gcc compiler
919ce0b7 SL	437	* version */
ec202eae SL	438	#ifndef thread_local
	439	/*
	440	* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
	441	* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
	442	*/
	443	#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) \|\| (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
	444	#define thread_local _Thread_local
	445	#else
	446	#define thread_local __thread
	447	#endif
	448	#endif
cabb7806	449
919ce0b7 SL	450	/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
	451	* compiler versions */
	452	#ifndef noreturn
	453	#if __STDC_VERSION__ >= 201112L
	454	#define noreturn _Noreturn
	455	#else
	456	#define noreturn __attribute__((noreturn))
	457	#endif
	458	#endif
	459
fed1e721 LP	460	#define UID_INVALID ((uid_t) -1)
	461	#define GID_INVALID ((gid_t) -1)
	462	#define MODE_INVALID ((mode_t) -1)
	463
a2341f68 ZJS	464	#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
	465	static inline void func##p(type *p) { \
	466	if (*p) \
	467	func(*p); \
	468	} \
	469	struct __useless_struct_to_allow_trailing_semicolon__
	470
2a1288ff LP	471	#define CMSG_FOREACH(cmsg, mh) \
	472	for ((cmsg) = CMSG_FIRSTHDR(mh); (cmsg); (cmsg) = CMSG_NXTHDR((mh), (cmsg)))
	473
dd8f71ee	474	#include "log.h"