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// Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
//
// SPDX-License-Identifier: BSD-2-Clause
#ifndef COMMON_TIME_H
#define COMMON_TIME_H
#include <common/limits.h>
#include <sys/time.h>
#include <wasi/api.h>
#include <stdbool.h>
#include <time.h>
#define NSEC_PER_SEC 1000000000
static inline bool timespec_to_timestamp_exact(
const struct timespec *timespec, __wasi_timestamp_t *timestamp) {
// Invalid nanoseconds field.
if (timespec->tv_nsec < 0 || timespec->tv_nsec >= NSEC_PER_SEC)
return false;
// Timestamps before the Epoch are not supported.
if (timespec->tv_sec < 0)
return false;
// Make sure our timestamp does not overflow.
return !__builtin_mul_overflow(timespec->tv_sec, NSEC_PER_SEC, timestamp) &&
!__builtin_add_overflow(*timestamp, timespec->tv_nsec, timestamp);
}
static inline bool timespec_to_timestamp_clamp(
const struct timespec *timespec, __wasi_timestamp_t *timestamp) {
// Invalid nanoseconds field.
if (timespec->tv_nsec < 0 || timespec->tv_nsec >= NSEC_PER_SEC)
return false;
if (timespec->tv_sec < 0) {
// Timestamps before the Epoch are not supported.
*timestamp = 0;
} else if (__builtin_mul_overflow(timespec->tv_sec, NSEC_PER_SEC, timestamp) ||
__builtin_add_overflow(*timestamp, timespec->tv_nsec, timestamp)) {
// Make sure our timestamp does not overflow.
*timestamp = NUMERIC_MAX(__wasi_timestamp_t);
}
return true;
}
static inline struct timespec timestamp_to_timespec(
__wasi_timestamp_t timestamp) {
// Decompose timestamp into seconds and nanoseconds.
return (struct timespec){.tv_sec = timestamp / NSEC_PER_SEC,
.tv_nsec = timestamp % NSEC_PER_SEC};
}
static inline struct timeval timestamp_to_timeval(
__wasi_timestamp_t timestamp) {
struct timespec ts = timestamp_to_timespec(timestamp);
return (struct timeval){.tv_sec = ts.tv_sec, ts.tv_nsec / 1000};
}
#endif
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