Refactor pvPortRealloc() to improve readability.
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1 changed files with 43 additions and 58 deletions
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@ -448,70 +448,55 @@ static void prvInsertBlockIntoFreeList( BlockLink_t *pxBlockToInsert )
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/*-----------------------------------------------------------*/
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/*-----------------------------------------------------------*/
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void *pvPortRealloc( void *pv, size_t xWantedSize )
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void* pvPortRealloc(void* pv, size_t xWantedSize) {
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{
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size_t move_size;
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size_t move_size;
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size_t block_size;
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size_t block_size;
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BlockLink_t* pxLink;
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BlockLink_t* pxLink;
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void* pvReturn = NULL;
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void* pvReturn = NULL;
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uint8_t* puc = (uint8_t*) pv;
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uint8_t* puc = (uint8_t*) pv;
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if (xWantedSize > 0)
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if (xWantedSize == 0) {
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{
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if (pv != NULL)
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{
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// The memory being freed will have an BlockLink_t structure immediately before it.
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puc -= xHeapStructSize;
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// This casting is to keep the compiler from issuing warnings.
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pxLink = (void*) puc;
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// Check allocate block
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if ((pxLink->xBlockSize & xBlockAllocatedBit) != 0)
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{
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// The block is being returned to the heap - it is no longer allocated.
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block_size = (pxLink->xBlockSize & ~xBlockAllocatedBit) - xHeapStructSize;
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// Allocate a new buffer
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pvReturn = pvPortMalloc(xWantedSize);
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// Check creation and determine the data size to be copied to the new buffer
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if (pvReturn != NULL)
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{
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if (block_size < xWantedSize)
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{
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move_size = block_size;
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}
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else
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{
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move_size = xWantedSize;
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}
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// Copy the data from the old buffer to the new one
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memcpy(pvReturn, pv, move_size);
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// Free the old buffer
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vPortFree(pv);
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}
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}
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else
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{
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// pv does not point to a valid memory buffer. Allocate a new one
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pvReturn = pvPortMalloc(xWantedSize);
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}
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}
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else
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{
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// pv points to NULL. Allocate a new buffer.
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pvReturn = pvPortMalloc(xWantedSize);
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}
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}
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else
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{
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// Zero bytes requested, do nothing (according to libc, this behavior implementation defined)
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// Zero bytes requested, do nothing (according to libc, this behavior implementation defined)
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pvReturn = NULL;
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return NULL;
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}
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}
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// Exit with memory block
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if (pv == NULL) {
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return pvReturn;
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// pv points to NULL. Allocate a new buffer.
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return pvPortMalloc(xWantedSize);
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}
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// The memory being freed will have an BlockLink_t structure immediately before it.
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puc -= xHeapStructSize;
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// This casting is to keep the compiler from issuing warnings.
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pxLink = (void*) puc;
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// Check allocate block
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if ((pxLink->xBlockSize & xBlockAllocatedBit) != 0) {
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// The block is being returned to the heap - it is no longer allocated.
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block_size = (pxLink->xBlockSize & ~xBlockAllocatedBit) - xHeapStructSize;
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// Allocate a new buffer
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pvReturn = pvPortMalloc(xWantedSize);
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// Check creation and determine the data size to be copied to the new buffer
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if (pvReturn != NULL) {
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if (block_size < xWantedSize) {
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move_size = block_size;
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} else {
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move_size = xWantedSize;
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}
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// Copy the data from the old buffer to the new one
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memcpy(pvReturn, pv, move_size);
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// Free the old buffer
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vPortFree(pv);
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}
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} else {
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// pv does not point to a valid memory buffer. Allocate a new one
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pvReturn = pvPortMalloc(xWantedSize);
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}
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return pvReturn;
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}
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}
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