Line data    Source code

       1             : #ifndef AWS_COMMON_CLOCK_INL
       2             : #define AWS_COMMON_CLOCK_INL
       3             : 
       4             : /**
       5             :  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
       6             :  * SPDX-License-Identifier: Apache-2.0.
       7             :  */
       8             : 
       9             : #include <aws/common/clock.h>
      10             : #include <aws/common/common.h>
      11             : #include <aws/common/math.h>
      12             : 
      13             : AWS_EXTERN_C_BEGIN
      14             : 
      15             : /**
      16             :  * Converts 'timestamp' from unit 'convert_from' to unit 'convert_to', if the units are the same then 'timestamp' is
      17             :  * returned. If 'remainder' is NOT NULL, it will be set to the remainder if convert_from is a more precise unit than
      18             :  * convert_to. To avoid unnecessary branching, 'remainder' is not zero initialized in this function, be sure to set it
      19             :  * to 0 first if you care about that kind of thing. If conversion would lead to integer overflow, the timestamp
      20             :  * returned will be the highest possible time that is representable, i.e. UINT64_MAX.
      21             :  */
      22             : AWS_STATIC_IMPL uint64_t aws_timestamp_convert(
      23             :     uint64_t timestamp,
      24             :     enum aws_timestamp_unit convert_from,
      25             :     enum aws_timestamp_unit convert_to,
      26           0 :     uint64_t *remainder) {
      27           0 :     uint64_t diff = 0;
      28           0 : 
      29           0 :     if (convert_to > convert_from) {
      30           0 :         diff = convert_to / convert_from;
      31           0 :         return aws_mul_u64_saturating(timestamp, diff);
      32           0 :     } else if (convert_to < convert_from) {
      33           0 :         diff = convert_from / convert_to;
      34           0 : 
      35           0 :         if (remainder) {
      36           0 :             *remainder = timestamp % diff;
      37           0 :         }
      38           0 : 
      39           0 :         return timestamp / diff;
      40           0 :     } else {
      41           0 :         return timestamp;
      42           0 :     }
      43           0 : }
      44             : 
      45             : AWS_EXTERN_C_END
      46             : 
      47             : #endif /* AWS_COMMON_CLOCK_INL */