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{
Free Pascal port of the Hermes C library.
Copyright (C) 2001-2003 Nikolay Nikolov (nickysn@users.sourceforge.net)
Original C version by Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version
with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
}
type
TListFreeCallback = procedure(p: Pointer);
PHermesListElementStruct = ^THermesListElementStruct;
THermesListElementStruct = record
handle: THermesHandle;
data: Pointer;
next: PHermesListElementStruct;
end;
PHermesListElement = ^THermesListElement;
THermesListElement = THermesListElementStruct;
PHermesList = ^THermesList;
THermesList = record
first, last: PHermesListElement;
end;
{function Hermes_ListNew: PHermesList;
procedure Hermes_ListDestroy(list: PHermesList);
function Hermes_ListElementNew(handle: THermesHandle): PHermesListElement;
procedure Hermes_ListAdd(list: PHermesList; element: PHermesListElement);
procedure Hermes_ListAddFront(list: PHermesList; element: PHermesListElement);
function Hermes_ListDeleteElement(list: PHermesList; handle: THermesHandle): Boolean;
function Hermes_ListLookup(list: PHermesList;
handle: THermesHandle): PHermesListElement;}
function Hermes_ListNew: PHermesList;
begin
New(Result);
Result^.first := nil;
Result^.last := nil;
end;
procedure Hermes_ListDestroy(list: PHermesList; user_free: TListFreeCallback);
var
tmp, run: PHermesListElement;
begin
if list = nil then
exit;
run := list^.first;
while run <> nil do
begin
tmp := run;
run := run^.next;
if (tmp^.data <> nil) and (user_free <> nil) then
user_free(tmp^.data);
Dispose(tmp);
end;
Dispose(list);
end;
function Hermes_ListElementNew(handle: THermesHandle): PHermesListElement;
begin
New(Result);
Result^.handle := handle;
Result^.next := nil;
Result^.data := nil;
end;
procedure Hermes_ListAdd(list: PHermesList; element: PHermesListElement);
begin
if (list = nil) or (element = nil) then
exit;
if list^.first = nil then
begin
list^.first := element;
list^.last := element;
element^.next := nil;
exit;
end;
list^.last^.next := element;
list^.last := element;
element^.next := nil;
end;
procedure Hermes_ListAddFront(list: PHermesList; element: PHermesListElement);
begin
if (list = nil) or (element = nil) then
exit;
if list^.first = nil then
begin
list^.first := element;
list^.last := element;
element^.next := nil;
exit;
end;
element^.next := list^.first;
list^.first := element;
end;
function Hermes_ListDeleteElement(list: PHermesList; handle: THermesHandle; user_free: TListFreeCallback): Boolean;
var
run, previous: PHermesListElement;
begin
if list = nil then
begin
Result := False;
exit;
end;
previous := nil;
run := list^.first;
while run <> nil do
begin
if run^.handle = handle then
begin
if run = list^.first then
list^.first := run^.next
else
previous^.next := run^.next;
if run = list^.last then
begin
list^.last := previous;
if list^.last <> nil then
list^.last^.next := nil;
end;
if (run^.data <> nil) and (user_free <> nil) then
user_free(run^.data);
Dispose(run);
Result := True;
exit;
end;
previous := run;
run := run^.next;
end;
Result := False;
end;
function Hermes_ListLookup(list: PHermesList;
handle: THermesHandle): PHermesListElement;
var
run: PHermesListElement;
begin
if list = nil then
begin
Result := nil;
exit;
end;
run := list^.first;
while run <> nil do
begin
if run^.handle = handle then
begin
Result := run;
exit;
end;
run := run^.next;
end;
Result := nil;
end;
|
