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/*
* stack.c
*
* Copyright(c) 1998 - 2009 Texas Instruments. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Texas Instruments nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** \file stack.c
* \brief Seport module API
*
* \see stack.h
*/
/***************************************************************************/
/* */
/* MODULE: stack.c */
/* PURPOSE: Stack module implementation */
/* */
/***************************************************************************/
#define __FILE_ID__ FILE_ID_133
#include "tidef.h"
#include "osApi.h"
#include "stack.h"
/**
* \date 30-May-2006\n
* \brief initialize stack object
*
* Function Scope \e Public.\n
* \param pStack - pointer to the Stack_t structure\n
* \param hOS - handle to the OS object\n
* \param uElemSize - size of a one stack element\n
* \param uDep - stack depth\n
* \param pBuf - pointer to the stack buffer; if NULL a memory for the stack buffer will be dynamically allocated\n
* \param fCpy - pointer to function copying the stack element; if NULL a default copy function will be used\n
* \return 0 - on success, -1 - on failure\n
*/
unsigned stackInit
(
Stack_t *pStack,
TI_HANDLE hOs,
unsigned uElemSize,
unsigned uDep,
void *pBuf,
void (*fCpy) (TI_HANDLE, void*, void*, unsigned)
)
{
pStack->hOs = hOs;
pStack->uPtr = 0;
pStack->uElemSize = uElemSize;
pStack->uDep = uDep * uElemSize;
if (pBuf)
{
pStack->pBuf = pBuf;
pStack->bBuf = 0;
}
else
{
pStack->pBuf = _os_memoryAlloc (hOs, pStack->uDep);
pStack->bBuf = TI_TRUE;
}
if (fCpy)
pStack->fCpy = fCpy;
else
pStack->fCpy = os_memoryCopy;
return 0;
}
/**
* \date 30-May-2006\n
* \brief destroy stack object
*
* Function Scope \e Public.\n
* \param pStack - pointer to the Stack_t structure\n
* \return 0 - on success, -1 - on failure\n
*/
unsigned stackDestroy (Stack_t *pStack)
{
if (pStack->bBuf)
_os_memoryFree (pStack->hOs, pStack->pBuf, pStack->uDep);
return 0;
}
/**
* \date 30-May-2006\n
* \brief destroy stack object
*
* Function Scope \e Public.\n
* \param pStack - pointer to the Stack_t structure\n
* \param pVal - the pointer to the pushed value\n
* \return 0 - on success, -1 - on failure\n
*/
unsigned stackPush (Stack_t *pStack, void *pVal)
{
if (pStack->uPtr < pStack->uDep)
{
pStack->fCpy (pStack->hOs, (unsigned char*)pStack->pBuf + pStack->uPtr, pVal, pStack->uElemSize);
pStack->uPtr += pStack->uElemSize;
return 0;
}
return -1;
}
/**
* \date 30-May-2006\n
* \brief destroy stack object
*
* Function Scope \e Public.\n
* \param pStack - pointer to the Stack_t structure\n
* \param pVal - the pointer to the popped value\n
* \return 0 - on success, -1 - on failure\n
*/
unsigned stackPop (Stack_t *pStack, void *pVal)
{
if (pStack->uPtr > 0)
{
pStack->uPtr -= pStack->uElemSize;
pStack->fCpy (pStack->hOs, pVal, (unsigned char*)pStack->pBuf + pStack->uPtr, pStack->uElemSize);
return 0;
}
return -1;
}
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