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/*
* Amazon FreeRTOS POSIX V1.1.0
* Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://aws.amazon.com/freertos
* http://www.FreeRTOS.org
*/
/**
* @file utils.h
* @brief Utility functions used by FreeRTOS+POSIX.
*/
#ifndef _FREERTOS_POSIX_UTILS_
#define _FREERTOS_POSIX_UTILS_
/* C standard library includes. */
#include <stdbool.h>
#include <stdint.h>
/* FreeRTOS+POSIX includes. */
#include "FreeRTOS_POSIX/time.h"
/**
* @brief Calculates the length of pcString, up to xMaxLength.
*
* @param[in] pcString The string to find the length of.
* @param[in] xMaxLength The limit when searching for the end of pcString.
*
* @return 0 if pcString is NULL; otherwise, the length of pcString or xMaxLength,
* whichever is smaller.
*/
size_t UTILS_strnlen( const char * const pcString,
size_t xMaxLength );
/**
* @brief Calculates the number of ticks between now and a given timespec.
*
* @param[in] pxAbsoluteTime A time in the future, specified as seconds and
* nanoseconds since CLOCK_REALTIME's 0.
* @param[in] pxCurrentTime current time, specified as seconds and
* nanoseconds.
* @param[out] pxResult Where the result of the conversion is stored. The result
* is rounded up for fractional ticks.
*
* @return 0 on success. Otherwise, ETIMEDOUT if pxAbsoluteTime is in the past,
* or EINVAL for invalid parameters.
*/
int UTILS_AbsoluteTimespecToDeltaTicks( const struct timespec * const pxAbsoluteTime,
const struct timespec * const pxCurrentTime,
TickType_t * const pxResult );
/**
* @brief Converts a struct timespec to FreeRTOS ticks.
*
* @param[in] pxTimespec The timespec to convert.
* @param[out] Where the result of the conversion is stored. The result is rounded
* up for fractional ticks.
*
* @return 0 on success. Otherwise, EINVAL for invalid parameters.
*/
int UTILS_TimespecToTicks( const struct timespec * const pxTimespec,
TickType_t * const pxResult );
/**
* @brief Converts an integer value to a timespec.
*
* @param[in] llSource The value to convert.
* @param[out] pxDestination Where to store the converted value.
*
* @return No return value.
*/
void UTILS_NanosecondsToTimespec( int64_t llSource,
struct timespec * const pxDestination );
/**
* @brief Calculates pxResult = x + y.
*
* @param[in] x The first argument for addition.
* @param[in] y The second argument for addition.
* @param[out] pxResult Where the result of the calculation is stored.
*
* @return -1 if any argument was NULL; 1 if result is negative (overflow); otherwise, 0.
*/
int UTILS_TimespecAdd( const struct timespec * const x,
const struct timespec * const y,
struct timespec * const pxResult );
/**
* @brief Calculates pxResult = x + ( struct timespec ) nanosec.
*
* @param[in] x The first argument for addition.
* @param[in] llNanoseconds The second argument for addition.
* @param[out] pxResult Where the result of the calculation is stored.
*
* @return -1 if pxResult or x was NULL; 1 if result is negative; otherwise, 0.
*/
int UTILS_TimespecAddNanoseconds( const struct timespec * const x,
int64_t llNanoseconds,
struct timespec * const pxResult );
/**
* @brief Calculates pxResult = x - y. If the result is negative contents of
* pResult are undefined
*
* @param[in] x The first argument for subtraction.
* @param[in] y The second argument for subtraction.
* @param[out] pxResult Where the result of the calculation is stored.
*
* @return -1 if any argument was NULL; 1 if result is negative; otherwise, 0.
*/
int UTILS_TimespecSubtract( const struct timespec * const x,
const struct timespec * const y,
struct timespec * const pxResult );
/**
* @brief Compare x == y.
*
* @param[in] x The first argument for comparison.
* @param[in] y The second argument for comparison.
*
* @return 0 if x == y; 1 if x > y; -1 if x < y or any argument was NULL
*/
int UTILS_TimespecCompare( const struct timespec * const x,
const struct timespec * const y );
/**
* @brief Checks that a timespec conforms to POSIX.
*
* A valid timespec must have 0 <= tv_nsec < 1000000000.
*
* @param[in] pxTimespec The timespec to validate.
*
* @return true if the pxTimespec is valid, false otherwise.
*/
bool UTILS_ValidateTimespec( const struct timespec * const pxTimespec );
#endif /* ifndef _FREERTOS_POSIX_UTILS_ */
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