Oneway malloc

A malloc implementation without free for boards where the toolchain does not implement dynamic memory allocation.

The toolchain of MSP-430, for example, does not contain malloc.h::malloc() and friends. These functions provide the same interface as the stdlib functions, but the option to free memory.

Note

You should prefer statically allocated memory whenever possible.

See also

Two-Level Segregated Fit memory allocator

void * malloc(msp430_types.h::size_t size)

Allocation a block of memory.

Parameters

size:Size of the block to allocate in bytes.

Return values

• The new memory block. NULL if the “heap” is exhausted.

void * realloc(void * ptr, msp430_types.h::size_t size)

Allocated a new block of memory and move the existing content.

This function allocates a new block of memory and memcpy()s the content of the ond ptr there.

Parameters

ptr:Old memory block that was allocated with malloc.h::malloc(), malloc.h::calloc() or malloc.h::realloc(). size:Size of the new block to allocted in bytes.

Return values

• The new memory block. NULL if the “heap” is exhausted.

void * calloc(msp430_types.h::size_t size, msp430_types.h::size_t cnt)

Allocate a memory block and set all its content to zeroes.

Please see malloc.h::malloc() for more information.

Note

This implementation of malloc.h::calloc() does not catch integer overflows

Parameters

size:One factor of the number of bytes to allocated. cnt:The other factor of the number of bytes to allocated.

Return values

• The new memory block. NULL if the “heap” is exhausted.

void free(void * ptr)

This is a no-op.

You read correctly: This function does noting.

Note

Keep in mind that this function does not free the memory. It does nothing.

Parameters

ptr:The ignored argument.