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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015 Jean-Pierre Charras, jean-pierre.charras@ujf-grenoble.fr
* Copyright (C) 2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
* Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
*
* Copyright (C) 1992-2015 KiCad Developers, see change_log.txt for contributors.
*
* First copyright (C) Randy Nevin, 1989 (see PCBCA package)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* @file queue.cpp
*/
#include <fctsys.h>
#include <common.h>
#include <pcbnew.h>
#include <autorout.h>
#include <cell.h>
struct PcbQueue /* search queue structure */
{
struct PcbQueue* Next;
int Row; /* current row */
int Col; /* current column */
int Side; /* 0=top, 1=bottom */
int Dist; /* path distance to this cell so far */
int ApxDist; /* approximate distance to target from here */
};
static long qlen = 0; /* current queue length */
static struct PcbQueue* Head = NULL;
static struct PcbQueue* Tail = NULL;
static struct PcbQueue* Save = NULL; /* hold empty queue structs */
/* Free the memory used for storing all the queue */
void FreeQueue()
{
struct PcbQueue* p;
InitQueue();
while( (p = Save) != NULL )
{
Save = p->Next;
delete p;
}
}
/* initialize the search queue */
void InitQueue()
{
struct PcbQueue* p;
while( (p = Head) != NULL )
{
Head = p->Next;
p->Next = Save; Save = p;
}
Tail = NULL;
OpenNodes = ClosNodes = MoveNodes = MaxNodes = qlen = 0;
}
/* get search queue item from list */
void GetQueue( int* r, int* c, int* s, int* d, int* a )
{
struct PcbQueue* p;
if( (p = Head) != NULL ) /* return first item in list */
{
*r = p->Row; *c = p->Col;
*s = p->Side;
*d = p->Dist; *a = p->ApxDist;
if( (Head = p->Next) == NULL )
Tail = NULL;
/* put node on free list */
p->Next = Save; Save = p;
ClosNodes++; qlen--;
}
else /* empty list */
{
*r = *c = *s = *d = *a = ILLEGAL;
}
}
/* add a search node to the list
* :
* 1 - OK
* 0 - Failed to allocate memory.
*/
bool SetQueue( int r, int c, int side, int d, int a, int r2, int c2 )
{
struct PcbQueue* p, * q, * t;
int i, j;
j = 0; // gcc warning fix
if( (p = Save) != NULL ) /* try free list first */
{
Save = p->Next;
}
else if( ( p = (PcbQueue*) operator new( sizeof( PcbQueue ), std::nothrow ) ) == NULL )
{
return 0;
}
p->Row = r;
p->Col = c;
p->Side = side;
i = (p->Dist = d) + (p->ApxDist = a);
p->Next = NULL;
if( (q = Head) != NULL ) /* insert in proper position in list */
{
if( q->Dist + q->ApxDist > i ) /* insert at head */
{
p->Next = q; Head = p;
}
else /* search for proper position */
{
for( t = q, q = q->Next; q && i > ( j = q->Dist + q->ApxDist ); t = q, q = q->Next )
;
if( q && i == j && q->Row == r2 && q->Col == c2 )
{
/* insert after q, which is a goal node */
if( ( p->Next = q->Next ) == NULL )
Tail = p;
q->Next = p;
}
else /* insert in front of q */
{
if( ( p->Next = q ) == NULL )
Tail = p;
t->Next = p;
}
}
}
else /* empty search list */
{
Head = Tail = p;
}
OpenNodes++;
if( ++qlen > MaxNodes )
MaxNodes = qlen;
return 1;
}
/* reposition node in list */
void ReSetQueue( int r, int c, int s, int d, int a, int r2, int c2 )
{
struct PcbQueue* p, * q;
/* first, see if it is already in the list */
for( q = NULL, p = Head; p; q = p, p = p->Next )
{
if( p->Row == r && p->Col == c && p->Side == s )
{
/* old one to remove */
if( q )
{
if( ( q->Next = p->Next ) == NULL )
Tail = q;
}
else if( ( Head = p->Next ) == NULL )
{
Tail = NULL;
}
p->Next = Save;
Save = p;
OpenNodes--;
MoveNodes++;
qlen--;
break;
}
}
if( !p ) /* not found, it has already been closed once */
ClosNodes--; /* we will close it again, but just count once */
/* if it was there, it's gone now; insert it at the proper position */
bool res = SetQueue( r, c, s, d, a, r2, c2 );
(void) res;
}
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