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_attr_(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 _introspect_(x) __attribute__((section("introspect." x)))
48 #define _alignas_(x) __attribute__((aligned(__alignof(x))))
49 #define _cleanup_(x) __attribute__((cleanup(x)))
51 /* automake test harness */
52 #define EXIT_TEST_SKIP 77
54 #define XSTRINGIFY(x) #x
55 #define STRINGIFY(x) XSTRINGIFY(x)
59 #define ALIGN4(l) (((l) + 3) & ~3)
60 #define ALIGN8(l) (((l) + 7) & ~7)
62 #if __SIZEOF_POINTER__ == 8
63 #define ALIGN(l) ALIGN8(l)
64 #elif __SIZEOF_POINTER__ == 4
65 #define ALIGN(l) ALIGN4(l)
67 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
70 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
71 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
72 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
74 static inline size_t ALIGN_TO(size_t l, size_t ali) {
75 return ((l + ali - 1) & ~(ali - 1));
78 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p))
80 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
83 * container_of - cast a member of a structure out to the containing structure
84 * @ptr: the pointer to the member.
85 * @type: the type of the container struct this is embedded in.
86 * @member: the name of the member within the struct.
89 #define container_of(ptr, type, member) \
91 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
92 (type *)( (char *)__mptr - offsetof(type,member) ); \
103 #define MAX3(x,y,z) \
105 typeof(x) _c = MAX(x,y); \
112 typeof(a) _a = (a); \
113 typeof(b) _b = (b); \
118 #define CLAMP(x, low, high) \
120 typeof(x) _x = (x); \
121 typeof(low) _low = (low); \
122 typeof(high) _high = (high); \
123 ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
127 #define assert_se(expr) \
129 if (_unlikely_(!(expr))) \
130 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
133 /* We override the glibc assert() here. */
136 #define assert(expr) do {} while(false)
138 #define assert(expr) assert_se(expr)
141 #define assert_not_reached(t) \
143 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
146 #if defined(static_assert)
147 #define assert_cc(expr) \
149 static_assert(expr, #expr); \
152 #define assert_cc(expr) \
162 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
163 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
164 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
165 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
167 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
168 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
169 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
170 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
172 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
173 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
174 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
175 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
177 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
178 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
179 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
180 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
182 #define memzero(x,l) (memset((x), 0, (l)))
183 #define zero(x) (memzero(&(x), sizeof(x)))
185 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
187 #define char_array_0(x) x[sizeof(x)-1] = 0;
189 #define IOVEC_SET_STRING(i, s) \
191 struct iovec *_i = &(i); \
192 char *_s = (char *)(s); \
194 _i->iov_len = strlen(_s); \
197 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
201 for (j = 0; j < n; j++)
207 static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
210 for (j = 0; j < n; j++) {
213 if (_unlikely_(k <= 0))
216 sub = MIN(i[j].iov_len, k);
218 i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
225 #define VA_FORMAT_ADVANCE(format, ap) \
227 int _argtypes[128]; \
229 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
230 assert(_k < ELEMENTSOF(_argtypes)); \
231 for (_i = 0; _i < _k; _i++) { \
232 if (_argtypes[_i] & PA_FLAG_PTR) { \
233 (void) va_arg(ap, void*); \
237 switch (_argtypes[_i]) { \
239 case PA_INT|PA_FLAG_SHORT: \
241 (void) va_arg(ap, int); \
243 case PA_INT|PA_FLAG_LONG: \
244 (void) va_arg(ap, long int); \
246 case PA_INT|PA_FLAG_LONG_LONG: \
247 (void) va_arg(ap, long long int); \
250 (void) va_arg(ap, wchar_t); \
255 (void) va_arg(ap, void*); \
259 (void) va_arg(ap, double); \
261 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
262 (void) va_arg(ap, long double); \
265 assert_not_reached("Unknown format string argument."); \
270 /* Because statfs.t_type can be int on some architecures, we have to cast
271 * the const magic to the type, otherwise the compiler warns about
272 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
274 #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. */
281 #define DECIMAL_STR_MAX(type) \
282 (1+(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))