src/common/safe.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef BABELTRACE_COMMON_SAFE_H
   8 #define BABELTRACE_COMMON_SAFE_H
   9
  10 #include <stdbool.h>
  11 #include <stdint.h>
  12
  13 #ifdef __cplusplus
  14 extern "C" {
  15 #endif
  16
  17 static inline
  18 bool bt_safe_to_mul_int64(int64_t a, int64_t b)
  19 {
  20         if (a == 0 || b == 0) {
  21                 return true;
  22         }
  23
  24         return a < INT64_MAX / b;
  25 }
  26
  27 static inline
  28 bool bt_safe_to_mul_uint64(uint64_t a, uint64_t b)
  29 {
  30         if (a == 0 || b == 0) {
  31                 return true;
  32         }
  33
  34         return a < UINT64_MAX / b;
  35 }
  36
  37 static inline
  38 bool bt_safe_to_add_int64(int64_t a, int64_t b)
  39 {
  40         return a <= INT64_MAX - b;
  41 }
  42
  43 static inline
  44 bool bt_safe_to_add_uint64(uint64_t a, uint64_t b)
  45 {
  46         return a <= UINT64_MAX - b;
  47 }
  48
  49 #ifdef __cplusplus
  50 }
  51 #endif
  52
  53 #endif /* BABELTRACE_COMMON_SAFE_H */