include/babeltrace2/babeltrace-internal.h

   1 #ifndef _BABELTRACE_INTERNAL_H
   2 #define _BABELTRACE_INTERNAL_H
   3
   4 /*
   5  * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25 #include <stdio.h>
  26 #include <glib.h>
  27 #include <stdint.h>
  28 #include <stdlib.h>
  29 #include <stdbool.h>
  30 #include <errno.h>
  31 #include <babeltrace2/compat/string-internal.h>
  32 #include <babeltrace2/types.h>
  33
  34 #define PERROR_BUFLEN   200
  35
  36 #ifndef likely
  37 # ifdef __GNUC__
  38 #  define likely(x)      __builtin_expect(!!(x), 1)
  39 # else
  40 #  define likely(x)      (!!(x))
  41 # endif
  42 #endif
  43
  44 #ifndef unlikely
  45 # ifdef __GNUC__
  46 #  define unlikely(x)    __builtin_expect(!!(x), 0)
  47 # else
  48 #  define unlikely(x)    (!!(x))
  49 # endif
  50 #endif
  51
  52 #ifndef min
  53 #define min(a, b)       (((a) < (b)) ? (a) : (b))
  54 #endif
  55
  56 #ifndef max
  57 #define max(a, b)       (((a) > (b)) ? (a) : (b))
  58 #endif
  59
  60 #ifndef max_t
  61 #define max_t(type, a, b)       \
  62         ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
  63 #endif
  64
  65 static inline
  66 bool bt_safe_to_mul_int64(int64_t a, int64_t b)
  67 {
  68         if (a == 0 || b == 0) {
  69                 return true;
  70         }
  71
  72         return a < INT64_MAX / b;
  73 }
  74
  75 static inline
  76 bool bt_safe_to_mul_uint64(uint64_t a, uint64_t b)
  77 {
  78         if (a == 0 || b == 0) {
  79                 return true;
  80         }
  81
  82         return a < UINT64_MAX / b;
  83 }
  84
  85 static inline
  86 bool bt_safe_to_add_int64(int64_t a, int64_t b)
  87 {
  88         return a <= INT64_MAX - b;
  89 }
  90
  91 static inline
  92 bool bt_safe_to_add_uint64(uint64_t a, uint64_t b)
  93 {
  94         return a <= UINT64_MAX - b;
  95 }
  96
  97 /*
  98  * Memory allocation zeroed
  99  */
 100 #define zmalloc(x) calloc(1, x)
 101
 102 /*
 103  * BT_HIDDEN: set the hidden attribute for internal functions
 104  * On Windows, symbols are local unless explicitly exported,
 105  * see https://gcc.gnu.org/wiki/Visibility
 106  */
 107 #if defined(_WIN32) || defined(__CYGWIN__)
 108 #define BT_HIDDEN
 109 #else
 110 #define BT_HIDDEN __attribute__((visibility("hidden")))
 111 #endif
 112
 113 #ifndef __STRINGIFY
 114 #define __STRINGIFY(x)  #x
 115 #endif
 116
 117 #define TOSTRING(x)     __STRINGIFY(x)
 118
 119 #define BT_UNUSED       __attribute__((unused))
 120
 121 #endif