vmdcheap.c   [plain text]

#include	"vmhdr.h"

/*	A discipline to get memory from the heap.
**
**	Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
*/
#if __STD_C
static Void_t* heapmem(Vmalloc_t* vm, Void_t* caddr,
			size_t csize, size_t nsize,
			Vmdisc_t* disc)
#else
static Void_t* heapmem(vm, caddr, csize, nsize, disc)
Vmalloc_t*	vm;	/* region doing allocation from 	*/
Void_t*		caddr;	/* current low address			*/
size_t		csize;	/* current size				*/
size_t		nsize;	/* new size				*/
Vmdisc_t*	disc;	/* discipline structure			*/
#endif
{
	NOTUSED(vm);
	NOTUSED(disc);

	if(csize == 0)
		return vmalloc(Vmheap,nsize);
	else if(nsize == 0)
		return vmfree(Vmheap,caddr) >= 0 ? caddr : NIL(Void_t*);
	else	return vmresize(Vmheap,caddr,nsize,0);
}

static Vmdisc_t _Vmdcheap = { heapmem, NIL(Vmexcept_f), 0 };
__DEFINE__(Vmdisc_t*,Vmdcheap,&_Vmdcheap);