_msize
Returns the size of a memory block allocated in the heap.
Syntax
size_t _msize(
void *memblock
);
Parameters
memblock
Pointer to the memory block.
Return value
_msize returns the size (in bytes) as an unsigned integer.
Remarks
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 (18,446,744,073,709,551,615 unsigned).
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
Requirements
| Routine | Required header |
|---|---|
_msize |
<malloc.h> |
For more compatibility information, see Compatibility.
Libraries
All versions of the C run-time libraries.
Example
See the example for realloc.