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
  42 /* Rounds up */
  43 static inline size_t ALIGN(size_t l) {
  44         return ((l + sizeof(void*) - 1) & ~(sizeof(void*) - 1));
  45 }
  46
  47 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
  48
  49 #define MAX(a,b)                                \
  50         __extension__ ({                        \
  51                         typeof(a) _a = (a);     \
  52                         typeof(b) _b = (b);     \
  53                         _a > _b ? _a : _b;      \
  54                 })
  55
  56 #define MIN(a,b)                                \
  57         __extension__ ({                        \
  58                         typeof(a) _a = (a);     \
  59                         typeof(b) _b = (b);     \
  60                         _a < _b ? _a : _b;      \
  61                 })
  62
  63 #define CLAMP(x, low, high)                                             \
  64         __extension__ ({                                                \
  65                         typeof(x) _x = (x);                             \
  66                         typeof(low) _low = (low);                       \
  67                         typeof(high) _high = (high);                    \
  68                         ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
  69                 })
  70
  71 #define assert_se(expr)                                                 \
  72         do {                                                            \
  73                 if (_unlikely(!(expr)))                                 \
  74                         log_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
  75                                    "Assertion '%s' failed at %s:%u, function %s(). Aborting.", \
  76                                    #expr , __FILE__, __LINE__, __PRETTY_FUNCTION__); \
  77         } while (false)                                                 \
  78
  79 /* We override the glibc assert() here. */
  80 #undef assert
  81 #ifdef NDEBUG
  82 #define assert(expr) do {} while(false)
  83 #else
  84 #define assert(expr) assert_se(expr)
  85 #endif
  86
  87 #define assert_not_reached(t)                                           \
  88         do {                                                            \
  89                 log_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__,     \
  90                            "Code should not be reached '%s' at %s:%u, function %s(). Aborting.", \
  91                            t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
  92         } while (false)
  93
  94 #define assert_cc(expr)                            \
  95         do {                                       \
  96                 switch (0) {                       \
  97                         case 0:                    \
  98                         case !!(expr):             \
  99                                 ;                  \
 100                 }                                  \
 101         } while (false)
 102
 103 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
 104 #define UINT_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 105
 106 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
 107 #define UINT32_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 108
 109 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
 110 #define INT_TO_PTR(u) ((void*) ((intptr_t) (u)))
 111
 112 #define TO_INT32(p) ((int32_t) ((intptr_t) (p)))
 113 #define INT32_TO_PTR(u) ((void*) ((intptr_t) (u)))
 114
 115 #define memzero(x,l) (memset((x), 0, (l)))
 116 #define zero(x) (memzero(&(x), sizeof(x)))
 117
 118 #define char_array_0(x) x[sizeof(x)-1] = 0;
 119
 120 #define IOVEC_SET_STRING(iovec, s)              \
 121         do {                                    \
 122                 (iovec).iov_base = s;           \
 123                 (iovec).iov_len = strlen(s);    \
 124         } while(false);
 125
 126 #include "log.h"
 127
 128 #endif