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/** @file
*
* VBox HDD container test utility - scripting engine, internal stack implementation.
*/
/*
* Copyright (C) 2013-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#ifndef VBOX_INCLUDED_SRC_testcase_VDScriptStack_h
#define VBOX_INCLUDED_SRC_testcase_VDScriptStack_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/list.h>
#include <iprt/string.h>
#include "VDScript.h"
/**
* Stack structure.
*/
typedef struct VDSCRIPTSTACK
{
/** Size of one stack element. */
size_t cbStackEntry;
/** Stack memory. */
void *pvStack;
/** Number of elements on the stack. */
unsigned cOnStack;
/** Maximum number of elements the stack can hold. */
unsigned cOnStackMax;
} VDSCRIPTSTACK;
/** Pointer to a stack. */
typedef VDSCRIPTSTACK *PVDSCRIPTSTACK;
/**
* Init the stack structure.
*
* @returns nothing.
* @param pStack The stack to initialize.
* @param cbStackEntry The size of one stack entry.
*/
DECLINLINE(void) vdScriptStackInit(PVDSCRIPTSTACK pStack, size_t cbStackEntry)
{
pStack->cbStackEntry = cbStackEntry;
pStack->pvStack = NULL;
pStack->cOnStack = 0;
pStack->cOnStackMax = 0;
}
/**
* Destroys the given stack freeing all memory.
*
* @returns nothing.
* @param pStack The stack to destroy.
*/
DECLINLINE(void) vdScriptStackDestroy(PVDSCRIPTSTACK pStack)
{
if (pStack->pvStack)
RTMemFree(pStack->pvStack);
pStack->cbStackEntry = 0;
pStack->pvStack = NULL;
pStack->cOnStack = 0;
pStack->cOnStackMax = 0;
}
/**
* Gets the topmost unused stack entry.
*
* @returns Pointer to the first unused entry.
* NULL if there is no room left and increasing the stack failed.
* @param pStack The stack.
*/
DECLINLINE(void *)vdScriptStackGetUnused(PVDSCRIPTSTACK pStack)
{
void *pvElem = NULL;
if (pStack->cOnStack >= pStack->cOnStackMax)
{
unsigned cOnStackMaxNew = pStack->cOnStackMax + 10;
void *pvStackNew = NULL;
/* Try to increase stack space. */
pvStackNew = RTMemRealloc(pStack->pvStack, cOnStackMaxNew * pStack->cbStackEntry);
if (pvStackNew)
{
pStack->pvStack = pvStackNew;
pStack->cOnStackMax = cOnStackMaxNew;
}
}
if (pStack->cOnStack < pStack->cOnStackMax)
pvElem = (char *)pStack->pvStack + pStack->cOnStack * pStack->cbStackEntry;
return pvElem;
}
/**
* Gets the topmost used entry on the stack.
*
* @returns Pointer to the first used entry
* or NULL if the stack is empty.
* @param pStack The stack.
*/
DECLINLINE(void *)vdScriptStackGetUsed(PVDSCRIPTSTACK pStack)
{
if (!pStack->cOnStack)
return NULL;
else
return (char *)pStack->pvStack + (pStack->cOnStack - 1) * pStack->cbStackEntry;
}
/**
* Increases the used element count for the given stack.
*
* @returns nothing.
* @param pStack The stack.
*/
DECLINLINE(void) vdScriptStackPush(PVDSCRIPTSTACK pStack)
{
pStack->cOnStack++;
}
/**
* Decreases the used element count for the given stack.
*
* @returns nothing.
* @param pStack The stack.
*/
DECLINLINE(void) vdScriptStackPop(PVDSCRIPTSTACK pStack)
{
pStack->cOnStack--;
}
#endif /* !VBOX_INCLUDED_SRC_testcase_VDScriptStack_h */
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