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/*
* Smithsonian Astrophysical Observatory, Cambridge, MA, USA
* This code has been modified under the terms listed below and is made
* available under the same terms.
*/
/*
* Copyright 1991-2004 George A Howlett.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include "bltChain.h"
using namespace Blt;
#ifndef ALIGN
#define ALIGN(a) \
(((size_t)a + (sizeof(double) - 1)) & (~(sizeof(double) - 1)))
#endif
Chain Blt::Chain_Create(void)
{
Chain chainPtr =(Chain)malloc(sizeof(_Chain));
if (chainPtr)
Chain_Init(chainPtr);
return chainPtr;
}
ChainLink Blt::Chain_AllocLink(size_t extraSize)
{
size_t linkSize = ALIGN(sizeof(_ChainLink));
ChainLink linkPtr = (ChainLink)calloc(1, linkSize + extraSize);
if (extraSize > 0) {
// Point clientData at the memory beyond the normal structure
linkPtr->clientData = (ClientData)((char *)linkPtr + linkSize);
}
return linkPtr;
}
void Blt::Chain_InitLink(ChainLink linkPtr)
{
linkPtr->clientData = NULL;
linkPtr->next = linkPtr->prev = NULL;
}
ChainLink Blt::Chain_NewLink(void)
{
ChainLink linkPtr = (ChainLink)malloc(sizeof(_ChainLink));
linkPtr->clientData = NULL;
linkPtr->next = linkPtr->prev = NULL;
return linkPtr;
}
void Blt::Chain_Reset(Chain chainPtr)
{
if (chainPtr) {
ChainLink oldPtr;
ChainLink linkPtr = chainPtr->head;
while (linkPtr) {
oldPtr = linkPtr;
linkPtr = linkPtr->next;
free(oldPtr);
}
Chain_Init(chainPtr);
}
}
void Blt::Chain_Destroy(Chain chainPtr)
{
if (chainPtr) {
Chain_Reset(chainPtr);
free(chainPtr);
chainPtr = NULL;
}
}
void Blt::Chain_Init(Chain chainPtr)
{
chainPtr->nLinks = 0;
chainPtr->head = chainPtr->tail = NULL;
}
void Blt::Chain_LinkAfter(Chain chainPtr, ChainLink linkPtr, ChainLink afterPtr)
{
if (chainPtr->head == NULL)
chainPtr->tail = chainPtr->head = linkPtr;
else {
if (afterPtr == NULL) {
// Append to the end of the chain
linkPtr->next = NULL;
linkPtr->prev = chainPtr->tail;
chainPtr->tail->next = linkPtr;
chainPtr->tail = linkPtr;
}
else {
linkPtr->next = afterPtr->next;
linkPtr->prev = afterPtr;
if (afterPtr == chainPtr->tail)
chainPtr->tail = linkPtr;
else
afterPtr->next->prev = linkPtr;
afterPtr->next = linkPtr;
}
}
chainPtr->nLinks++;
}
void Blt::Chain_LinkBefore(Chain chainPtr, ChainLink linkPtr,
ChainLink beforePtr)
{
if (chainPtr->head == NULL)
chainPtr->tail = chainPtr->head = linkPtr;
else {
if (beforePtr == NULL) {
// Prepend to the front of the chain
linkPtr->next = chainPtr->head;
linkPtr->prev = NULL;
chainPtr->head->prev = linkPtr;
chainPtr->head = linkPtr;
}
else {
linkPtr->prev = beforePtr->prev;
linkPtr->next = beforePtr;
if (beforePtr == chainPtr->head)
chainPtr->head = linkPtr;
else
beforePtr->prev->next = linkPtr;
beforePtr->prev = linkPtr;
}
}
chainPtr->nLinks++;
}
void Blt::Chain_UnlinkLink(Chain chainPtr, ChainLink linkPtr)
{
// Indicates if the link is actually remove from the chain
int unlinked;
unlinked = 0;
if (chainPtr->head == linkPtr) {
chainPtr->head = linkPtr->next;
unlinked = 1;
}
if (chainPtr->tail == linkPtr) {
chainPtr->tail = linkPtr->prev;
unlinked = 1;
}
if (linkPtr->next) {
linkPtr->next->prev = linkPtr->prev;
unlinked = 1;
}
if (linkPtr->prev) {
linkPtr->prev->next = linkPtr->next;
unlinked = 1;
}
if (unlinked) {
chainPtr->nLinks--;
}
linkPtr->prev = linkPtr->next = NULL;
}
void Blt::Chain_DeleteLink(Chain chain, ChainLink link)
{
Chain_UnlinkLink(chain, link);
free(link);
link = NULL;
}
ChainLink Blt::Chain_Append(Chain chain, ClientData clientData)
{
ChainLink link = Chain_NewLink();
Chain_LinkAfter(chain, link, (ChainLink)NULL);
Chain_SetValue(link, clientData);
return link;
}
ChainLink Blt::Chain_Prepend(Chain chain, ClientData clientData)
{
ChainLink link = Chain_NewLink();
Chain_LinkBefore(chain, link, (ChainLink)NULL);
Chain_SetValue(link, clientData);
return link;
}
int Blt::Chain_IsBefore(ChainLink firstPtr, ChainLink lastPtr)
{
for (ChainLink linkPtr = firstPtr; linkPtr; linkPtr = linkPtr->next) {
if (linkPtr == lastPtr)
return 1;
}
return 0;
}
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