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