Add pvPortRealloc() in heap_4_infinitime.c. An implementation of realloc() is needed by NimBLE.

This commit is contained in:
Jean-François Milants 2023-03-26 14:31:59 +02:00 committed by JF
parent 1df3d1a14d
commit 9e808a65ec

View file

@ -31,10 +31,14 @@
* (coalescences) adjacent memory blocks as they are freed, and in so doing
* limits memory fragmentation.
*
* This implementation is based on heap_4.c and add the function pvPortRealloc()
* to the original implementation.
*
* See heap_1.c, heap_2.c and heap_3.c for alternative implementations, and the
* memory management pages of http://www.FreeRTOS.org for more information.
*/
#include <stdlib.h>
#include <string.h>
/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
all the API functions to use the MPU wrappers. That should only be done when
@ -442,3 +446,72 @@ static void prvInsertBlockIntoFreeList( BlockLink_t *pxBlockToInsert )
}
}
/*-----------------------------------------------------------*/
void *pvPortRealloc( void *pv, size_t xWantedSize )
{
size_t move_size;
size_t block_size;
BlockLink_t* pxLink;
void* pvReturn = NULL;
uint8_t* puc = (uint8_t*) pv;
if (xWantedSize > 0)
{
if (pv != NULL)
{
// The memory being freed will have an BlockLink_t structure immediately before it.
puc -= xHeapStructSize;
// This casting is to keep the compiler from issuing warnings.
pxLink = (void*) puc;
// Check allocate block
if ((pxLink->xBlockSize & xBlockAllocatedBit) != 0)
{
// The block is being returned to the heap - it is no longer allocated.
block_size = (pxLink->xBlockSize & ~xBlockAllocatedBit) - xHeapStructSize;
// Allocate a new buffer
pvReturn = pvPortMalloc(xWantedSize);
// Check creation and determine the data size to be copied to the new buffer
if (pvReturn != NULL)
{
if (block_size < xWantedSize)
{
move_size = block_size;
}
else
{
move_size = xWantedSize;
}
// Copy the data from the old buffer to the new one
memcpy(pvReturn, pv, move_size);
// Free the old buffer
vPortFree(pv);
}
}
else
{
// pv does not point to a valid memory buffer. Allocate a new one
pvReturn = pvPortMalloc(xWantedSize);
}
}
else
{
// pv points to NULL. Allocate a new buffer.
pvReturn = pvPortMalloc(xWantedSize);
}
}
else
{
// Zero bytes requested, do nothing (according to libc, this behavior implementation defined)
pvReturn = NULL;
}
// Exit with memory block
return pvReturn;
}