FreeRTOS_POSIX_utils.c File Reference

Implementation of utility functions in utils.h. More...

#include <stddef.h>
#include <limits.h>
#include "FreeRTOS_POSIX.h"
#include "FreeRTOS_POSIX/errno.h"
#include "FreeRTOS_POSIX/utils.h"

Functions
size_t	UTILS_strnlen (const char *const pcString, size_t xMaxLength)
	Calculates the length of pcString, up to xMaxLength. More...
int	UTILS_AbsoluteTimespecToDeltaTicks (const struct timespec *const pxAbsoluteTime, const struct timespec *const pxCurrentTime, TickType_t *const pxResult)
	Calculates the number of ticks between now and a given timespec. More...
int	UTILS_TimespecToTicks (const struct timespec *const pxTimespec, TickType_t *const pxResult)
	Converts a struct timespec to FreeRTOS ticks. More...
void	UTILS_NanosecondsToTimespec (int64_t llSource, struct timespec *const pxDestination)
	Converts an integer value to a timespec. More...
int	UTILS_TimespecAdd (const struct timespec *const x, const struct timespec *const y, struct timespec *const pxResult)
	Calculates pxResult = x + y. More...
int	UTILS_TimespecAddNanoseconds (const struct timespec *const x, int64_t llNanoseconds, struct timespec *const pxResult)
	Calculates pxResult = x + ( struct timespec ) nanosec. More...
int	UTILS_TimespecSubtract (const struct timespec *const x, const struct timespec *const y, struct timespec *const pxResult)
	Calculates pxResult = x - y. If the result is negative contents of pResult are undefined. More...
int	UTILS_TimespecCompare (const struct timespec *const x, const struct timespec *const y)
	Compare x == y. More...
bool	UTILS_ValidateTimespec (const struct timespec *const pxTimespec)
	Checks that a timespec conforms to POSIX. More...

Detailed Description

Implementation of utility functions in utils.h.

Function Documentation

UTILS_strnlen()

size_t UTILS_strnlen	(	const char *const	pcString,
		size_t	xMaxLength
	)

Calculates the length of pcString, up to xMaxLength.

Parameters

[in]	pcString	The string to find the length of.
[in]	xMaxLength	The limit when searching for the end of pcString.

Returns

0 if pcString is NULL; otherwise, the length of pcString or xMaxLength, whichever is smaller.

UTILS_AbsoluteTimespecToDeltaTicks()

int UTILS_AbsoluteTimespecToDeltaTicks	(	const struct timespec *const	pxAbsoluteTime,
		const struct timespec *const	pxCurrentTime,
		TickType_t *const	pxResult
	)

Calculates the number of ticks between now and a given timespec.

Parameters

[in]	pxAbsoluteTime	A time in the future, specified as seconds and nanoseconds since CLOCK_REALTIME's 0.
[in]	pxCurrentTime	current time, specified as seconds and nanoseconds.
[out]	pxResult	Where the result of the conversion is stored. The result is rounded up for fractional ticks.

Returns

0 on success. Otherwise, ETIMEDOUT if pxAbsoluteTime is in the past, or EINVAL for invalid parameters.

UTILS_TimespecToTicks()

int UTILS_TimespecToTicks	(	const struct timespec *const	pxTimespec,
		TickType_t *const	pxResult
	)

Converts a struct timespec to FreeRTOS ticks.

Parameters

[in]	pxTimespec	The timespec to convert.
[out]	Where	the result of the conversion is stored. The result is rounded up for fractional ticks.

Returns

0 on success. Otherwise, EINVAL for invalid parameters.

UTILS_NanosecondsToTimespec()

void UTILS_NanosecondsToTimespec	(	int64_t	llSource,
		struct timespec *const	pxDestination
	)

Converts an integer value to a timespec.

Parameters

[in]	llSource	The value to convert.
[out]	pxDestination	Where to store the converted value.

Returns

No return value.

UTILS_TimespecAdd()

int UTILS_TimespecAdd	(	const struct timespec *const	x,
		const struct timespec *const	y,
		struct timespec *const	pxResult
	)

Calculates pxResult = x + y.

This function supports both signed and unsigned type definitions of the timespec.tv_sec member.

Parameters

[in]	x	The first argument for addition.
[in]	y	The second argument for addition.
[out]	pxResult	Where the result of the calculation is stored.

Returns

-1 if any argument is NULL or any of the input values is negative; 1 if there is an overflow in the result; otherwise, 0 for success.

UTILS_TimespecAddNanoseconds()

int UTILS_TimespecAddNanoseconds	(	const struct timespec *const	x,
		int64_t	llNanoseconds,
		struct timespec *const	pxResult
	)

Calculates pxResult = x + ( struct timespec ) nanosec.

Parameters

[in]	x	The first argument for addition.
[in]	llNanoseconds	The second argument for addition.
[out]	pxResult	Where the result of the calculation is stored.

Returns

-1 if pxResult or x was NULL; 1 if result is negative; otherwise, 0.

UTILS_TimespecSubtract()

int UTILS_TimespecSubtract	(	const struct timespec *const	x,
		const struct timespec *const	y,
		struct timespec *const	pxResult
	)

Calculates pxResult = x - y. If the result is negative contents of pResult are undefined.

Parameters

[in]	x	The first argument for subtraction.
[in]	y	The second argument for subtraction.
[out]	pxResult	Where the result of the calculation is stored.

Returns

-1 if any argument was NULL; 1 if result is negative; otherwise, 0.

UTILS_TimespecCompare()

int UTILS_TimespecCompare	(	const struct timespec *const	x,
		const struct timespec *const	y
	)

Compare x == y.

Parameters

[in]	x	The first argument for comparison.
[in]	y	The second argument for comparison.

Returns

0 if x == y; 1 if x > y; -1 if x < y or any argument was NULL

UTILS_ValidateTimespec()

bool UTILS_ValidateTimespec

(

const struct timespec *const

pxTimespec

)

Checks that a timespec conforms to POSIX.

A valid timespec must have 0 <= tv_nsec < 1000000000.

Parameters

[in]

pxTimespec

The timespec to validate.

Returns

true if the pxTimespec is valid, false otherwise.