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git.ipfire.org Git - thirdparty/systemd.git/blob - src/shared/macro.h
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/param.h>
26 #include <sys/types.h>
30 #define _printf_(a,b) __attribute__ ((format (printf, a, b)))
31 #define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
32 #define _sentinel_ __attribute__ ((sentinel))
33 #define _unused_ __attribute__ ((unused))
34 #define _destructor_ __attribute__ ((destructor))
35 #define _pure_ __attribute__ ((pure))
36 #define _const_ __attribute__ ((const))
37 #define _deprecated_ __attribute__ ((deprecated))
38 #define _packed_ __attribute__ ((packed))
39 #define _malloc_ __attribute__ ((malloc))
40 #define _weak_ __attribute__ ((weak))
41 #define _likely_(x) (__builtin_expect(!!(x),1))
42 #define _unlikely_(x) (__builtin_expect(!!(x),0))
43 #define _public_ __attribute__ ((visibility("default")))
44 #define _hidden_ __attribute__ ((visibility("hidden")))
45 #define _weakref_(x) __attribute__((weakref(#x)))
46 #define _alignas_(x) __attribute__((aligned(__alignof(x))))
47 #define _cleanup_(x) __attribute__((cleanup(x)))
49 /* automake test harness */
50 #define EXIT_TEST_SKIP 77
52 #define XSTRINGIFY(x) #x
53 #define STRINGIFY(x) XSTRINGIFY(x)
55 #define XCONCATENATE(x, y) x ## y
56 #define CONCATENATE(x, y) XCONCATENATE(x, y)
58 #define UNIQUE(prefix) CONCATENATE(prefix, __LINE__)
62 #define ALIGN4(l) (((l) + 3) & ~3)
63 #define ALIGN8(l) (((l) + 7) & ~7)
65 #if __SIZEOF_POINTER__ == 8
66 #define ALIGN(l) ALIGN8(l)
67 #elif __SIZEOF_POINTER__ == 4
68 #define ALIGN(l) ALIGN4(l)
70 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
73 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
74 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
75 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
77 static inline size_t ALIGN_TO(size_t l
, size_t ali
) {
78 return ((l
+ ali
- 1) & ~(ali
- 1));
81 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p))
83 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
86 * container_of - cast a member of a structure out to the containing structure
87 * @ptr: the pointer to the member.
88 * @type: the type of the container struct this is embedded in.
89 * @member: the name of the member within the struct.
92 #define container_of(ptr, type, member) \
94 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
95 (type *)( (char *)__mptr - offsetof(type,member) ); \
101 typeof(a) _a = (a); \
102 typeof(b) _b = (b); \
106 #define MAX3(x,y,z) \
108 typeof(x) _c = MAX(x,y); \
115 typeof(a) _a = (a); \
116 typeof(b) _b = (b); \
121 #define CLAMP(x, low, high) \
123 typeof(x) _x = (x); \
124 typeof(low) _low = (low); \
125 typeof(high) _high = (high); \
126 ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
130 #define assert_se(expr) \
132 if (_unlikely_(!(expr))) \
133 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
136 /* We override the glibc assert() here. */
139 #define assert(expr) do {} while(false)
141 #define assert(expr) assert_se(expr)
144 #define assert_not_reached(t) \
146 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
149 #if defined(static_assert)
150 #define assert_cc(expr) static_assert(expr, #expr)
152 #define assert_cc(expr) struct UNIQUE(_assert_struct_) { char x[(expr) ? 0 : -1]; };
155 #define assert_return(expr, r) \
157 if (_unlikely_(!(expr))) { \
158 log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
163 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
164 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
165 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
166 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
168 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
169 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
170 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
171 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
173 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
174 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
175 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
176 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
178 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
179 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
180 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
181 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
183 #define memzero(x,l) (memset((x), 0, (l)))
184 #define zero(x) (memzero(&(x), sizeof(x)))
186 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
188 #define char_array_0(x) x[sizeof(x)-1] = 0;
190 #define IOVEC_SET_STRING(i, s) \
192 struct iovec *_i = &(i); \
193 char *_s = (char *)(s); \
195 _i->iov_len = strlen(_s); \
198 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec
*i
, unsigned n
) {
202 for (j
= 0; j
< n
; j
++)
208 static inline size_t IOVEC_INCREMENT(struct iovec
*i
, unsigned n
, size_t k
) {
211 for (j
= 0; j
< n
; j
++) {
214 if (_unlikely_(k
<= 0))
217 sub
= MIN(i
[j
].iov_len
, k
);
219 i
[j
].iov_base
= (uint8_t*) i
[j
].iov_base
+ sub
;
226 #define VA_FORMAT_ADVANCE(format, ap) \
228 int _argtypes[128]; \
230 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
231 assert(_k < ELEMENTSOF(_argtypes)); \
232 for (_i = 0; _i < _k; _i++) { \
233 if (_argtypes[_i] & PA_FLAG_PTR) { \
234 (void) va_arg(ap, void*); \
238 switch (_argtypes[_i]) { \
240 case PA_INT|PA_FLAG_SHORT: \
242 (void) va_arg(ap, int); \
244 case PA_INT|PA_FLAG_LONG: \
245 (void) va_arg(ap, long int); \
247 case PA_INT|PA_FLAG_LONG_LONG: \
248 (void) va_arg(ap, long long int); \
251 (void) va_arg(ap, wchar_t); \
256 (void) va_arg(ap, void*); \
260 (void) va_arg(ap, double); \
262 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
263 (void) va_arg(ap, long double); \
266 assert_not_reached("Unknown format string argument."); \
271 /* Because statfs.t_type can be int on some architectures, we have to cast
272 * the const magic to the type, otherwise the compiler warns about
273 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
275 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
277 /* Returns the number of chars needed to format variables of the
278 * specified type as a decimal string. Adds in extra space for a
279 * negative '-' prefix. */
280 #define DECIMAL_STR_MAX(type) \
281 (2+(sizeof(type) <= 1 ? 3 : \
282 sizeof(type) <= 2 ? 5 : \
283 sizeof(type) <= 4 ? 10 : \
284 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
286 #define SET_FLAG(v, flag, b) \
287 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
289 #define IN_SET(x, ...) \
291 const typeof(x) _x = (x); \
293 bool _found = false; \
294 for (_i = 0; _i < sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
295 if (((const typeof(_x)[]) { __VA_ARGS__ })[_i] == _x) { \
302 /* Define C11 thread_local attribute even on older gcc compiler
306 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
307 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
309 #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
310 #define thread_local _Thread_local
312 #define thread_local __thread
316 /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
317 * compiler versions */
319 #if __STDC_VERSION__ >= 201112L
320 #define noreturn _Noreturn
322 #define noreturn __attribute__((noreturn))