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/*
* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef OSSL_INTERNAL_TIME_H
# define OSSL_INTERNAL_TIME_H
# pragma once
# include <openssl/e_os2.h> /* uint64_t */
# include "internal/e_os.h" /* for struct timeval */
# include "internal/safe_math.h"
/* The precision of times allows this many values per second */
# define OSSL_TIME_SECOND 1000000000
/* Macro representing the most distant future time */
# define OSSL_TIME_INFINITY (~(OSSL_TIME)0)
/* Macro that's guaranteed to be now or before */
# define OSSL_TIME_IMMEDIATE 0
/*
* Internal type defining a time.
* The time datum is Unix's 1970 and at nanosecond precision, this gives
* a range of 584 years roughly.
*/
typedef uint64_t OSSL_TIME;
/* Get current time */
OSSL_TIME ossl_time_now(void);
/* Convert time to timeval */
static ossl_unused ossl_inline
void ossl_time_time_to_timeval(OSSL_TIME t, struct timeval *out)
{
#ifdef _WIN32
out->tv_sec = (long int)(t / OSSL_TIME_SECOND);
#else
out->tv_sec = (time_t)(t / OSSL_TIME_SECOND);
#endif
out->tv_usec = (t % OSSL_TIME_SECOND) / (OSSL_TIME_SECOND / 1000000);
}
/* Compare two time values, return -1 if less, 1 if greater and 0 if equal */
static ossl_unused ossl_inline
int ossl_time_compare(OSSL_TIME a, OSSL_TIME b)
{
if (a > b)
return 1;
if (a < b)
return -1;
return 0;
}
/*
* Arithmetic operations on times.
* These operations are saturating, in that an overflow or underflow returns
* the largest or smallest value respectively.
*/
OSSL_SAFE_MATH_UNSIGNED(time, OSSL_TIME)
static ossl_unused ossl_inline
OSSL_TIME ossl_time_add(OSSL_TIME a, OSSL_TIME b)
{
OSSL_TIME r;
int err = 0;
r = safe_add_time(a, b, &err);
return err ? OSSL_TIME_INFINITY : r;
}
static ossl_unused ossl_inline
OSSL_TIME ossl_time_subtract(OSSL_TIME a, OSSL_TIME b)
{
OSSL_TIME r;
int err = 0;
r = safe_sub_time(a, b, &err);
return err ? 0 : r;
}
#endif
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