src/common/safe.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #include <stdbool.h>
   8 #include <stdint.h>
   9
  10 #ifdef __cplusplus
  11 extern "C" {
  12 #endif
  13
  14 static inline
  15 bool bt_safe_to_mul_int64(int64_t a, int64_t b)
  16 {
  17         if (a == 0 || b == 0) {
  18                 return true;
  19         }
  20
  21         return a < INT64_MAX / b;
  22 }
  23
  24 static inline
  25 bool bt_safe_to_mul_uint64(uint64_t a, uint64_t b)
  26 {
  27         if (a == 0 || b == 0) {
  28                 return true;
  29         }
  30
  31         return a < UINT64_MAX / b;
  32 }
  33
  34 static inline
  35 bool bt_safe_to_add_int64(int64_t a, int64_t b)
  36 {
  37         return a <= INT64_MAX - b;
  38 }
  39
  40 static inline
  41 bool bt_safe_to_add_uint64(uint64_t a, uint64_t b)
  42 {
  43         return a <= UINT64_MAX - b;
  44 }
  45
  46 #ifdef __cplusplus
  47 }
  48 #endif