base.impl.h File Reference

Common types and functions (implementation) More...

#include "base.h"
#include <stdlib.h>

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Functions
ModbusError	modbusDefaultAllocator (ModbusBuffer *buffer, uint16_t size, void *context)
	The default memory allocator based on realloc()
	ModbusErrorInfomodbusBufferInit (ModbusBuffer *buffer, ModbusAllocator allocator)
	Initializes a buffer for use.
void	modbusBufferFree (ModbusBuffer *buffer, void *context)
	Frees memory allocated inside the buffer.
void	modbusBufferDestroy (ModbusBuffer *buffer, void *context)
	Equivalent of modbusBufferFree() \copydetail modbusBufferFree()
ModbusError	modbusBufferAllocateADU (ModbusBuffer *buffer, uint16_t pduSize, void *context)
	Allocates memory to hold Modbus ADU.
uint16_t	modbusCRC (const uint8_t *data, uint16_t length)
	Calculates 16-bit Modbus CRC of provided data.

Detailed Description

Common types and functions (implementation)

Function Documentation

modbusBufferAllocateADU()

ModbusError modbusBufferAllocateADU	(	ModbusBuffer *	buffer,
		uint16_t	pduSize,
		void *	context )

Allocates memory to hold Modbus ADU.

Parameters

pduSize	size of the PDU in bytes
context	context pointer passed on to the allocator

Returns

MODBUS_OK on success

MODBUS_ERROR_ALLOC on allocation failure

If called with pduSize == 0, the buffer is freed. Otherwise a buffer for (pduSize + buffer->padding) bytes is allocated. This guarantees that the buffer is big enough to hold the entire ADU.

This function is responsible for managing data, pdu and length fields in the buffer struct. The pdu pointer is set up to point pduOffset bytes after the data pointer unless data is a null pointer.

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modbusBufferDestroy()

void modbusBufferDestroy	(	ModbusBuffer *	buffer,
		void *	context )

Equivalent of modbusBufferFree() \copydetail modbusBufferFree()

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modbusBufferFree()

void modbusBufferFree	(	ModbusBuffer *	buffer,
		void *	context )

Frees memory allocated inside the buffer.

Parameters

context

context pointer passed on to the allocator

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modbusCRC()

uint16_t modbusCRC	(	const uint8_t *	data,
		uint16_t	length )

Calculates 16-bit Modbus CRC of provided data.

Parameters

data	A pointer to the data to be processed
length	Number of bytes, starting at the data pointer, to process

Returns

16-bit Modbus CRC value

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modbusDefaultAllocator()

ModbusError modbusDefaultAllocator	(	ModbusBuffer *	buffer,
		uint16_t	size,
		void *	context )

The default memory allocator based on realloc()

Parameters

buffer	a pointer to the buffer to be reallocated
size	new desired buffer size in bytes
context	user's context pointer

Returns

MODBUS_ERROR_ALLOC on allocation failure

MODBUS_OK on success

See also

allocators

ModbusErrorInfomodbusBufferInit()

ModbusErrorInfomodbusBufferInit	(	ModbusBuffer *	buffer,
		ModbusAllocator	allocator )

Initializes a buffer for use.

Parameters

allocator

Memory allocator to be used by the buffer

Returns

MODBUS_NO_ERROR() on success