Hi,

Rene W. Olsen wrote:

I don't know what realloc() does, the code looks like this

while (size > 0) { interface->altsetting = realloc(interface->altsetting, sizeof(struct usb_interface_descriptor) * (interface->num_altsetting + 1)); if (!interface->altsetting) { if (usb_debug >= 1) fprintf(stderr, "couldn't malloc interface->altsetting\n"); return -1; } .... }

So I was wonder is its extend or just allocating a new block of memory?

Both.

If the original pointer is NULL, it is equivalent to a malloc. If it's not, it will re-allocate the block, and the contents will remain the same (up to min(oldsize, newsize)). If size is zero, it's equivalent to a free.

Note that it does not necessarily operate in-place. It might also allocate at a new address, and copy the contents.

Here's a link to the manpage: http://www.rt.com/man/realloc.3.html

Regards,

Hi,

Rene W. Olsen wrote:

But I not really sure this is ok, what happens if reallocvec() need to alloc a new block and move the memory? how do I get the new mem pointer?

Exec's ReallocVec does not move memory, it will resize in place if there is enough room, otherwise it will fail.

Regards,

On 2005/05/31, Thomas Frieden wrote:

...

So I was wonder is its extend or just allocating a new block of memory?

Both.

If the original pointer is NULL, it is equivalent to a malloc. If it's not, it will re-allocate the block, and the contents will remain the same (up to min(oldsize, newsize)). If size is zero, it's equivalent to a free.

Note that it does not necessarily operate in-place. It might also allocate at a new address, and copy the contents.

Here's a link to the manpage: http://www.rt.com/man/realloc.3.html

I have been trying to use exec's realloc and my resoult looks like this

APTR my_realloc( struct LibusbBase *libBase, APTR mem, uint32 size ) { struct LibusbBase *libBase; APTR retval;

libBase = (struct LibusbBase *)Self->Data.LibBase;

if ( mem ) { retval = libBase->lib_IExec->AllocVec( size, MEMF_CLEAR|MEMF_PUBLIC ); } else { libBase->lib_IExec->ReallocVec( mem, size, MEMF_CLEAR|MEMF_PUBLIC ); retval = mem; }

return( retval ); }

But I not really sure this is ok, what happens if reallocvec() need to alloc a new block and move the memory? how do I get the new mem pointer?

Regards Rene W. Olsen