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)
58 #define ALIGN4(l) (((l) + 3) & ~3)
59 #define ALIGN8(l) (((l) + 7) & ~7)
61 #if __SIZEOF_POINTER__ == 8
62 #define ALIGN(l) ALIGN8(l)
63 #elif __SIZEOF_POINTER__ == 4
64 #define ALIGN(l) ALIGN4(l)
66 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
69 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
70 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
71 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
73 static inline size_t ALIGN_TO(size_t l, size_t ali) {
74 return ((l + ali - 1) & ~(ali - 1));
77 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p))
79 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
82 * container_of - cast a member of a structure out to the containing structure
83 * @ptr: the pointer to the member.
84 * @type: the type of the container struct this is embedded in.
85 * @member: the name of the member within the struct.
88 #define container_of(ptr, type, member) \
90 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
91 (type *)( (char *)__mptr - offsetof(type,member) ); \
102 #define MAX3(x,y,z) \
104 typeof(x) _c = MAX(x,y); \
111 typeof(a) _a = (a); \
112 typeof(b) _b = (b); \
117 #define CLAMP(x, low, high) \
119 typeof(x) _x = (x); \
120 typeof(low) _low = (low); \
121 typeof(high) _high = (high); \
122 ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
126 #define assert_se(expr) \
128 if (_unlikely_(!(expr))) \
129 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
132 /* We override the glibc assert() here. */
135 #define assert(expr) do {} while(false)
137 #define assert(expr) assert_se(expr)
140 #define assert_not_reached(t) \
142 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
145 #if defined(static_assert)
146 #define assert_cc(expr) static_assert(expr, #expr)
148 #define assert_cc(expr) struct _assert_struct_ ## __LINE__ { char x[(expr) ? 0 : -1]; }
151 #define assert_return(expr, r) \
153 if (_unlikely_(!(expr))) \
157 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
158 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
159 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
160 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
162 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
163 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
164 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
165 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
167 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
168 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
169 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
170 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
172 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
173 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
174 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
175 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
177 #define memzero(x,l) (memset((x), 0, (l)))
178 #define zero(x) (memzero(&(x), sizeof(x)))
180 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
182 #define char_array_0(x) x[sizeof(x)-1] = 0;
184 #define IOVEC_SET_STRING(i, s) \
186 struct iovec *_i = &(i); \
187 char *_s = (char *)(s); \
189 _i->iov_len = strlen(_s); \
192 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
196 for (j = 0; j < n; j++)
202 static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
205 for (j = 0; j < n; j++) {
208 if (_unlikely_(k <= 0))
211 sub = MIN(i[j].iov_len, k);
213 i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
220 #define VA_FORMAT_ADVANCE(format, ap) \
222 int _argtypes[128]; \
224 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
225 assert(_k < ELEMENTSOF(_argtypes)); \
226 for (_i = 0; _i < _k; _i++) { \
227 if (_argtypes[_i] & PA_FLAG_PTR) { \
228 (void) va_arg(ap, void*); \
232 switch (_argtypes[_i]) { \
234 case PA_INT|PA_FLAG_SHORT: \
236 (void) va_arg(ap, int); \
238 case PA_INT|PA_FLAG_LONG: \
239 (void) va_arg(ap, long int); \
241 case PA_INT|PA_FLAG_LONG_LONG: \
242 (void) va_arg(ap, long long int); \
245 (void) va_arg(ap, wchar_t); \
250 (void) va_arg(ap, void*); \
254 (void) va_arg(ap, double); \
256 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
257 (void) va_arg(ap, long double); \
260 assert_not_reached("Unknown format string argument."); \
265 /* Because statfs.t_type can be int on some architecures, we have to cast
266 * the const magic to the type, otherwise the compiler warns about
267 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
269 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
271 /* Returns the number of chars needed to format variables of the
272 * specified type as a decimal string. Adds in extra space for a
273 * negative '-' prefix. */
274 #define DECIMAL_STR_MAX(type) \
275 (1+(sizeof(type) <= 1 ? 3 : \
276 sizeof(type) <= 2 ? 5 : \
277 sizeof(type) <= 4 ? 10 : \
278 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
280 #define SET_FLAG(v, flag, b) \
281 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))