Returns the size of a memory block allocated in the heap.
size_t _msize( void *memblock );
Pointer to the memory block.
_msize returns the size (in bytes) as an unsigned integer.
The _msize function returns the size, in bytes, of the memory block allocated by a call to calloc, malloc, or realloc.
When the application is linked with a debug version of the C run-time libraries, _msize resolves to _msize_dbg. For more information about how the heap is managed during the debugging process, see The CRT Debug Heap.
This function validates its parameter. If memblock is a null pointer, _msize invokes an invalid parameter handler, as described in Parameter Validation. If the error is handled, the function sets errno to EINVAL and returns -1.
By default, this function's global state is scoped to the application. To change this, see Global state in the CRT.
For more compatibility information, see Compatibility.
All versions of the C run-time libraries.
See the example for realloc.