projects / wasi-libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 320054e8 DG |
1 | // Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/ |
| 2 | // | |
| 3 | // SPDX-License-Identifier: BSD-2-Clause | |
| 4 | ||
| 5 | #ifndef COMMON_TIME_H | |
| 6 | #define COMMON_TIME_H | |
| 7 | ||
| 8 | #include <common/limits.h> | |
| 320054e8 DG |
9 | |
| 10 | #include <sys/time.h> | |
| 11 | ||
| 446cb3f1 | 12 | #include <wasi/api.h> |
| 320054e8 DG |
13 | #include <stdbool.h> |
| 14 | #include <time.h> | |
| 15 | ||
| 16 | #define NSEC_PER_SEC 1000000000 | |
| 17 | ||
| 320054e8 DG |
18 | static inline bool timespec_to_timestamp_exact( |
| 19 | const struct timespec *timespec, __wasi_timestamp_t *timestamp) { | |
| 20 | // Invalid nanoseconds field. | |
| 21 | if (timespec->tv_nsec < 0 || timespec->tv_nsec >= NSEC_PER_SEC) | |
| 22 | return false; | |
| 23 | ||
| 24 | // Timestamps before the Epoch are not supported. | |
| 25 | if (timespec->tv_sec < 0) | |
| 26 | return false; | |
| 27 | ||
| 28 | // Make sure our timestamp does not overflow. | |
| 60f221a4 DG |
29 | return !__builtin_mul_overflow(timespec->tv_sec, NSEC_PER_SEC, timestamp) && |
| 30 | !__builtin_add_overflow(*timestamp, timespec->tv_nsec, timestamp); | |
| 320054e8 DG |
31 | } |
| 32 | ||
| 33 | static inline bool timespec_to_timestamp_clamp( | |
| 34 | const struct timespec *timespec, __wasi_timestamp_t *timestamp) { | |
| 35 | // Invalid nanoseconds field. | |
| 36 | if (timespec->tv_nsec < 0 || timespec->tv_nsec >= NSEC_PER_SEC) | |
| 37 | return false; | |
| 38 | ||
| 39 | if (timespec->tv_sec < 0) { | |
| 40 | // Timestamps before the Epoch are not supported. | |
| 41 | *timestamp = 0; | |
| 60f221a4 DG |
42 | } else if (__builtin_mul_overflow(timespec->tv_sec, NSEC_PER_SEC, timestamp) || |
| 43 | __builtin_add_overflow(*timestamp, timespec->tv_nsec, timestamp)) { | |
| 320054e8 DG |
44 | // Make sure our timestamp does not overflow. |
| 45 | *timestamp = NUMERIC_MAX(__wasi_timestamp_t); | |
| 46 | } | |
| 47 | return true; | |
| 48 | } | |
| 49 | ||
| 50 | static inline struct timespec timestamp_to_timespec( | |
| 51 | __wasi_timestamp_t timestamp) { | |
| 52 | // Decompose timestamp into seconds and nanoseconds. | |
| 53 | return (struct timespec){.tv_sec = timestamp / NSEC_PER_SEC, | |
| 54 | .tv_nsec = timestamp % NSEC_PER_SEC}; | |
| 55 | } | |
| 56 | ||
| 57 | static inline struct timeval timestamp_to_timeval( | |
| 58 | __wasi_timestamp_t timestamp) { | |
| 59 | struct timespec ts = timestamp_to_timespec(timestamp); | |
| 60 | return (struct timeval){.tv_sec = ts.tv_sec, ts.tv_nsec / 1000}; | |
| 61 | } | |
| 62 | ||
| 63 | #endif |