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Software Explosion (Fore-Matt Home Computing)(1996).iso
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list.c
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C/C++ Source or Header
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1991-10-14
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1KB
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62 lines
//
// LIST - list processing functions for orbiter
//
// Version: 1.0 Copyright (C) 1990, Hutchins Software
// Author: Edward Hutchins
// Revisions:
//
#include "orbiter.h"
//
// AddHead - add an object to the head of a list
//
VOID FAR PASCAL AddHead( NPLIST npList, NPNODE npNode )
{
if (npList->npHead)
{
npNode->npNext = npList->npHead;
npNode->npPrev = NULL;
npList->npHead = (npList->npHead->npPrev = npNode);
}
else // add to an empty list
{
npList->npHead = npList->npTail = npNode;
npNode->npNext = npNode->npPrev = NULL;
}
}
//
// RemHead - remove the first element in a list
//
NPNODE FAR PASCAL RemHead( NPLIST npList )
{
if (npList->npHead)
{
NPNODE npNode = npList->npHead;
if (npList->npTail != npNode)
{
npList->npHead = npNode->npNext;
npNode->npNext->npPrev = NULL;
}
else npList->npHead = npList->npTail = NULL;
return( npNode );
}
else return( NULL );
}
//
// Remove - remove an arbitrary element from a list
//
VOID FAR PASCAL Remove( NPLIST npList, NPNODE npNode )
{
if (npNode->npPrev) npNode->npPrev->npNext = npNode->npNext;
else npList->npHead = npNode->npNext;
if (npNode->npNext) npNode->npNext->npPrev = npNode->npPrev;
else npList->npTail = npNode->npPrev;
}