src/macro.h

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #ifndef foomacrohfoo
   4 #define foomacrohfoo
   5
   6 /***
   7   This file is part of systemd.
   8
   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU General Public License as published by
  13   the Free Software Foundation; either version 2 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 ***/
  24
  25 #include <assert.h>
  26 #include <sys/types.h>
  27
  28 #define _printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
  29 #define _sentinel_ __attribute__ ((sentinel))
  30 #define _noreturn_ __attribute__((noreturn))
  31 #define _unused_ __attribute__ ((unused))
  32 #define _destructor_ __attribute__ ((destructor))
  33 #define _pure_ __attribute__ ((pure))
  34 #define _const_ __attribute__ ((const))
  35 #define _deprecated_ __attribute__ ((deprecated))
  36 #define _packed_ __attribute__ ((packed))
  37 #define _malloc_ __attribute__ ((malloc))
  38 #define _weak_ __attribute__ ((weak))
  39 #define _likely_(x) (__builtin_expect(!!(x),1))
  40 #define _unlikely_(x) (__builtin_expect(!!(x),0))
  41 #define _public_ __attribute__ ((visibility("default")))
  42 #define _hidden_ __attribute__ ((visibility("hidden")))
  43 #define _weakref_(x) __attribute__((weakref(#x)))
  44
  45 /* Rounds up */
  46 static inline size_t ALIGN(size_t l) {
  47         return ((l + sizeof(void*) - 1) & ~(sizeof(void*) - 1));
  48 }
  49
  50 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
  51
  52 #define MAX(a,b)                                \
  53         __extension__ ({                        \
  54                         typeof(a) _a = (a);     \
  55                         typeof(b) _b = (b);     \
  56                         _a > _b ? _a : _b;      \
  57                 })
  58
  59 #define MIN(a,b)                                \
  60         __extension__ ({                        \
  61                         typeof(a) _a = (a);     \
  62                         typeof(b) _b = (b);     \
  63                         _a < _b ? _a : _b;      \
  64                 })
  65
  66 #define CLAMP(x, low, high)                                             \
  67         __extension__ ({                                                \
  68                         typeof(x) _x = (x);                             \
  69                         typeof(low) _low = (low);                       \
  70                         typeof(high) _high = (high);                    \
  71                         ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
  72                 })
  73
  74 #define assert_se(expr)                                                 \
  75         do {                                                            \
  76                 if (_unlikely_(!(expr)))                                \
  77                         log_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
  78                                    "Assertion '%s' failed at %s:%u, function %s(). Aborting.", \
  79                                    #expr , __FILE__, __LINE__, __PRETTY_FUNCTION__); \
  80         } while (false)                                                 \
  81
  82 /* We override the glibc assert() here. */
  83 #undef assert
  84 #ifdef NDEBUG
  85 #define assert(expr) do {} while(false)
  86 #else
  87 #define assert(expr) assert_se(expr)
  88 #endif
  89
  90 #define assert_not_reached(t)                                           \
  91         do {                                                            \
  92                 log_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__,     \
  93                            "Code should not be reached '%s' at %s:%u, function %s(). Aborting.", \
  94                            t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
  95         } while (false)
  96
  97 #define assert_cc(expr)                            \
  98         do {                                       \
  99                 switch (0) {                       \
 100                         case 0:                    \
 101                         case !!(expr):             \
 102                                 ;                  \
 103                 }                                  \
 104         } while (false)
 105
 106 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
 107 #define UINT_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 108
 109 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
 110 #define UINT32_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 111
 112 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
 113 #define ULONG_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 114
 115 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
 116 #define INT_TO_PTR(u) ((void*) ((intptr_t) (u)))
 117
 118 #define TO_INT32(p) ((int32_t) ((intptr_t) (p)))
 119 #define INT32_TO_PTR(u) ((void*) ((intptr_t) (u)))
 120
 121 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
 122 #define LONG_TO_PTR(u) ((void*) ((intptr_t) (u)))
 123
 124 #define memzero(x,l) (memset((x), 0, (l)))
 125 #define zero(x) (memzero(&(x), sizeof(x)))
 126
 127 #define char_array_0(x) x[sizeof(x)-1] = 0;
 128
 129 #define IOVEC_SET_STRING(i, s)                  \
 130         do {                                    \
 131                 struct iovec *_i = &(i);        \
 132                 char *_s = (char *)(s);         \
 133                 _i->iov_base = _s;              \
 134                 _i->iov_len = strlen(_s);       \
 135         } while(false);
 136
 137 #include "log.h"
 138
 139 #endif