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 _noreturn_ __attribute__((noreturn))
34 #define _unused_ __attribute__ ((unused))
35 #define _destructor_ __attribute__ ((destructor))
36 #define _pure_ __attribute__ ((pure))
37 #define _const_ __attribute__ ((const))
38 #define _deprecated_ __attribute__ ((deprecated))
39 #define _packed_ __attribute__ ((packed))
40 #define _malloc_ __attribute__ ((malloc))
41 #define _weak_ __attribute__ ((weak))
42 #define _likely_(x) (__builtin_expect(!!(x),1))
43 #define _unlikely_(x) (__builtin_expect(!!(x),0))
44 #define _public_ __attribute__ ((visibility("default")))
45 #define _hidden_ __attribute__ ((visibility("hidden")))
46 #define _weakref_(x) __attribute__((weakref(#x)))
47 #define _alignas_(x) __attribute__((aligned(__alignof(x))))
48 #define _cleanup_(x) __attribute__((cleanup(x)))
50 /* automake test harness */
51 #define EXIT_TEST_SKIP 77
53 #define XSTRINGIFY(x) #x
54 #define STRINGIFY(x) XSTRINGIFY(x)
56 #define XCONCATENATE(x, y) x ## y
57 #define CONCATENATE(x, y) XCONCATENATE(x, y)
59 #define UNIQUE(prefix) CONCATENATE(prefix, __LINE__)
63 #define ALIGN4(l) (((l) + 3) & ~3)
64 #define ALIGN8(l) (((l) + 7) & ~7)
66 #if __SIZEOF_POINTER__ == 8
67 #define ALIGN(l) ALIGN8(l)
68 #elif __SIZEOF_POINTER__ == 4
69 #define ALIGN(l) ALIGN4(l)
71 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
74 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
75 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
76 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
78 static inline size_t ALIGN_TO(size_t l, size_t ali) {
79 return ((l + ali - 1) & ~(ali - 1));
82 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p))
84 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
87 * container_of - cast a member of a structure out to the containing structure
88 * @ptr: the pointer to the member.
89 * @type: the type of the container struct this is embedded in.
90 * @member: the name of the member within the struct.
93 #define container_of(ptr, type, member) \
95 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
96 (type *)( (char *)__mptr - offsetof(type,member) ); \
102 typeof(a) _a = (a); \
103 typeof(b) _b = (b); \
107 #define MAX3(x,y,z) \
109 typeof(x) _c = MAX(x,y); \
116 typeof(a) _a = (a); \
117 typeof(b) _b = (b); \
122 #define CLAMP(x, low, high) \
124 typeof(x) _x = (x); \
125 typeof(low) _low = (low); \
126 typeof(high) _high = (high); \
127 ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
131 #define assert_se(expr) \
133 if (_unlikely_(!(expr))) \
134 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
137 /* We override the glibc assert() here. */
140 #define assert(expr) do {} while(false)
142 #define assert(expr) assert_se(expr)
145 #define assert_not_reached(t) \
147 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
150 #if defined(static_assert)
151 #define assert_cc(expr) static_assert(expr, #expr)
153 #define assert_cc(expr) struct UNIQUE(_assert_struct_) { char x[(expr) ? 0 : -1]; };
156 #define assert_return(expr, r) \
158 if (_unlikely_(!(expr))) { \
159 log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
164 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
165 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
166 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
167 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
169 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
170 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
171 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
172 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
174 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
175 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
176 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
177 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
179 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
180 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
181 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
182 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
184 #define memzero(x,l) (memset((x), 0, (l)))
185 #define zero(x) (memzero(&(x), sizeof(x)))
187 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
189 #define char_array_0(x) x[sizeof(x)-1] = 0;
191 #define IOVEC_SET_STRING(i, s) \
193 struct iovec *_i = &(i); \
194 char *_s = (char *)(s); \
196 _i->iov_len = strlen(_s); \
199 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
203 for (j = 0; j < n; j++)
209 static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
212 for (j = 0; j < n; j++) {
215 if (_unlikely_(k <= 0))
218 sub = MIN(i[j].iov_len, k);
220 i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
227 #define VA_FORMAT_ADVANCE(format, ap) \
229 int _argtypes[128]; \
231 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
232 assert(_k < ELEMENTSOF(_argtypes)); \
233 for (_i = 0; _i < _k; _i++) { \
234 if (_argtypes[_i] & PA_FLAG_PTR) { \
235 (void) va_arg(ap, void*); \
239 switch (_argtypes[_i]) { \
241 case PA_INT|PA_FLAG_SHORT: \
243 (void) va_arg(ap, int); \
245 case PA_INT|PA_FLAG_LONG: \
246 (void) va_arg(ap, long int); \
248 case PA_INT|PA_FLAG_LONG_LONG: \
249 (void) va_arg(ap, long long int); \
252 (void) va_arg(ap, wchar_t); \
257 (void) va_arg(ap, void*); \
261 (void) va_arg(ap, double); \
263 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
264 (void) va_arg(ap, long double); \
267 assert_not_reached("Unknown format string argument."); \
272 /* Because statfs.t_type can be int on some architectures, we have to cast
273 * the const magic to the type, otherwise the compiler warns about
274 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
276 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
278 /* Returns the number of chars needed to format variables of the
279 * specified type as a decimal string. Adds in extra space for a
280 * negative '-' prefix. */
281 #define DECIMAL_STR_MAX(type) \
282 (2+(sizeof(type) <= 1 ? 3 : \
283 sizeof(type) <= 2 ? 5 : \
284 sizeof(type) <= 4 ? 10 : \
285 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
287 #define SET_FLAG(v, flag, b) \
288 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
290 #define IN_SET(x, ...) \
292 const typeof(x) _x = (x); \
294 bool _found = false; \
295 for (_i = 0; _i < sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
296 if (((const typeof(_x)[]) { __VA_ARGS__ })[_i] == _x) { \