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
  39 /* Rounds up */
  40 static inline size_t ALIGN(size_t l) {
  41         return ((l + sizeof(void*) - 1) & ~(sizeof(void*) - 1));
  42 }
  43
  44 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
  45
  46 #define MAX(a,b)                                \
  47         __extension__ ({                        \
  48                         typeof(a) _a = (a);     \
  49                         typeof(b) _b = (b);     \
  50                         _a > _b ? _a : _b;      \
  51                 })
  52
  53 #define MIN(a,b)                                \
  54         __extension__ ({                        \
  55                         typeof(a) _a = (a);     \
  56                         typeof(b) _b = (b);     \
  57                         _a < _b ? _a : _b;      \
  58                 })
  59
  60 #define CLAMP(x, low, high)                                             \
  61         __extension__ ({                                                \
  62                         typeof(x) _x = (x);                             \
  63                         typeof(low) _low = (low);                       \
  64                         typeof(high) _high = (high);                    \
  65                         ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
  66                 })
  67
  68
  69
  70 #define assert_not_reached(t) assert(!(t))
  71
  72 #define assert_se(x) assert(x)
  73
  74 #define assert_cc(expr)                            \
  75         do {                                       \
  76                 switch (0) {                       \
  77                         case 0:                    \
  78                         case !!(expr):             \
  79                                 ;                  \
  80                 }                                  \
  81         } while (false)
  82
  83 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
  84 #define UINT_TO_PTR(u) ((void*) ((uintptr_t) (u)))
  85
  86 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
  87 #define UINT32_TO_PTR(u) ((void*) ((uintptr_t) (u)))
  88
  89 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
  90 #define INT_TO_PTR(u) ((void*) ((intptr_t) (u)))
  91
  92 #define TO_INT32(p) ((int32_t) ((intptr_t) (p)))
  93 #define INT32_TO_PTR(u) ((void*) ((intptr_t) (u)))
  94
  95 #define memzero(x,l) (memset((x), 0, (l)))
  96 #define zero(x) (memzero(&(x), sizeof(x)))
  97
  98 #define char_array_0(x) x[sizeof(x)-1] = 0;
  99
 100 #endif