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/**********************************************************************
* File: clst.h (Formerly clist.h)
* Description: CONS cell list module include file.
* Author: Phil Cheatle
* Created: Mon Jan 28 08:33:13 GMT 1991
*
* (C) Copyright 1991, Hewlett-Packard Ltd.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
**********************************************************************/
#ifndef CLST_H
#define CLST_H
#include <stdio.h>
#include "host.h"
#include "serialis.h"
#include "lsterr.h"
class CLIST_ITERATOR;
/**********************************************************************
* CLASS - CLIST_LINK
*
* Generic link class for singly linked CONS cell lists
*
* Note: No destructor - elements are assumed to be destroyed EITHER after
* they have been extracted from a list OR by the CLIST destructor which
* walks the list.
**********************************************************************/
class DLLSYM CLIST_LINK
{
friend class CLIST_ITERATOR;
friend class CLIST;
CLIST_LINK *next;
void *data;
public:
CLIST_LINK() { //constructor
data = next = NULL;
}
CLIST_LINK( // copy constructor
const CLIST_LINK &) { // don't copy link
data = next = NULL;
}
void operator=( // don't copy links
const CLIST_LINK &) {
data = next = NULL;
}
};
/**********************************************************************
* CLASS - CLIST
*
* Generic list class for singly linked CONS cell lists
**********************************************************************/
class DLLSYM CLIST
{
friend class CLIST_ITERATOR;
CLIST_LINK *last; //End of list
//(Points to head)
CLIST_LINK *First() { // return first
return last != NULL ? last->next : NULL;
}
public:
CLIST() { //constructor
last = NULL;
}
~CLIST () { //destructor
shallow_clear();
}
void internal_deep_clear ( //destroy all links
void (*zapper) (void *)); //ptr to zapper functn
void shallow_clear(); // clear list but don't
// delete data elements
bool empty() const { //is list empty?
return !last;
}
bool singleton() const {
return last != NULL ? (last == last->next) : false;
}
void shallow_copy( //dangerous!!
CLIST *from_list) { //beware destructors!!
last = from_list->last;
}
void assign_to_sublist( //to this list
CLIST_ITERATOR *start_it, //from list start
CLIST_ITERATOR *end_it); //from list end
inT32 length() const; //# elements in list
void sort ( //sort elements
int comparator ( //comparison routine
const void *, const void *));
// Assuming list has been sorted already, insert new_data to
// keep the list sorted according to the same comparison function.
// Comparison function is the same as used by sort, i.e. uses double
// indirection. Time is O(1) to add to beginning or end.
// Time is linear to add pre-sorted items to an empty list.
// If unique, then don't add duplicate entries.
// Returns true if the element was added to the list.
bool add_sorted(int comparator(const void*, const void*),
bool unique, void* new_data);
// Assuming that the minuend and subtrahend are already sorted with
// the same comparison function, shallow clears this and then copies
// the set difference minuend - subtrahend to this, being the elements
// of minuend that do not compare equal to anything in subtrahend.
// If unique is true, any duplicates in minuend are also eliminated.
void set_subtract(int comparator(const void*, const void*), bool unique,
CLIST* minuend, CLIST* subtrahend);
};
/***********************************************************************
* CLASS - CLIST_ITERATOR
*
* Generic iterator class for singly linked lists with embedded
*links
**********************************************************************/
class DLLSYM CLIST_ITERATOR
{
friend void CLIST::assign_to_sublist(CLIST_ITERATOR *, CLIST_ITERATOR *);
CLIST *list; //List being iterated
CLIST_LINK *prev; //prev element
CLIST_LINK *current; //current element
CLIST_LINK *next; //next element
BOOL8 ex_current_was_last; //current extracted
//was end of list
BOOL8 ex_current_was_cycle_pt; //current extracted
//was cycle point
CLIST_LINK *cycle_pt; //point we are cycling
//the list to.
BOOL8 started_cycling; //Have we moved off
//the start?
CLIST_LINK *extract_sublist( //from this current...
CLIST_ITERATOR *other_it); //to other current
public:
CLIST_ITERATOR() { //constructor
list = NULL;
} //unassigned list
CLIST_ITERATOR( //constructor
CLIST *list_to_iterate);
void set_to_list( //change list
CLIST *list_to_iterate);
void add_after_then_move( //add after current &
void *new_data); //move to new
void add_after_stay_put( //add after current &
void *new_data); //stay at current
void add_before_then_move( //add before current &
void *new_data); //move to new
void add_before_stay_put( //add before current &
void *new_data); //stay at current
void add_list_after( //add a list &
CLIST *list_to_add); //stay at current
void add_list_before( //add a list &
CLIST *list_to_add); //move to it 1st item
void *data() { //get current data
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::data", ABORT, NULL);
if (!current)
NULL_DATA.error ("CLIST_ITERATOR::data", ABORT, NULL);
#endif
return current->data;
}
void *data_relative( //get data + or - ...
inT8 offset); //offset from current
void *forward(); //move to next element
void *extract(); //remove from list
void *move_to_first(); //go to start of list
void *move_to_last(); //go to end of list
void mark_cycle_pt(); //remember current
BOOL8 empty() { //is list empty?
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::empty", ABORT, NULL);
#endif
return list->empty ();
}
BOOL8 current_extracted() { //current extracted?
return !current;
}
BOOL8 at_first(); //Current is first?
BOOL8 at_last(); //Current is last?
BOOL8 cycled_list(); //Completed a cycle?
void add_to_end( // add at end &
void *new_data); // don't move
void exchange( //positions of 2 links
CLIST_ITERATOR *other_it); //other iterator
inT32 length(); //# elements in list
void sort ( //sort elements
int comparator ( //comparison routine
const void *, const void *));
};
/***********************************************************************
* CLIST_ITERATOR::set_to_list
*
* (Re-)initialise the iterator to point to the start of the list_to_iterate
* over.
**********************************************************************/
inline void CLIST_ITERATOR::set_to_list( //change list
CLIST *list_to_iterate) {
#ifndef NDEBUG
if (!list_to_iterate)
BAD_PARAMETER.error ("CLIST_ITERATOR::set_to_list", ABORT,
"list_to_iterate is NULL");
#endif
list = list_to_iterate;
prev = list->last;
current = list->First ();
next = current != NULL ? current->next : NULL;
cycle_pt = NULL; //await explicit set
started_cycling = FALSE;
ex_current_was_last = FALSE;
ex_current_was_cycle_pt = FALSE;
}
/***********************************************************************
* CLIST_ITERATOR::CLIST_ITERATOR
*
* CONSTRUCTOR - set iterator to specified list;
**********************************************************************/
inline CLIST_ITERATOR::CLIST_ITERATOR(CLIST *list_to_iterate) {
set_to_list(list_to_iterate);
}
/***********************************************************************
* CLIST_ITERATOR::add_after_then_move
*
* Add a new element to the list after the current element and move the
* iterator to the new element.
**********************************************************************/
inline void CLIST_ITERATOR::add_after_then_move( // element to add
void *new_data) {
CLIST_LINK *new_element;
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::add_after_then_move", ABORT, NULL);
if (!new_data)
BAD_PARAMETER.error ("CLIST_ITERATOR::add_after_then_move", ABORT,
"new_data is NULL");
#endif
new_element = new CLIST_LINK;
new_element->data = new_data;
if (list->empty ()) {
new_element->next = new_element;
list->last = new_element;
prev = next = new_element;
}
else {
new_element->next = next;
if (current) { //not extracted
current->next = new_element;
prev = current;
if (current == list->last)
list->last = new_element;
}
else { //current extracted
prev->next = new_element;
if (ex_current_was_last)
list->last = new_element;
if (ex_current_was_cycle_pt)
cycle_pt = new_element;
}
}
current = new_element;
}
/***********************************************************************
* CLIST_ITERATOR::add_after_stay_put
*
* Add a new element to the list after the current element but do not move
* the iterator to the new element.
**********************************************************************/
inline void CLIST_ITERATOR::add_after_stay_put( // element to add
void *new_data) {
CLIST_LINK *new_element;
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::add_after_stay_put", ABORT, NULL);
if (!new_data)
BAD_PARAMETER.error ("CLIST_ITERATOR::add_after_stay_put", ABORT,
"new_data is NULL");
#endif
new_element = new CLIST_LINK;
new_element->data = new_data;
if (list->empty ()) {
new_element->next = new_element;
list->last = new_element;
prev = next = new_element;
ex_current_was_last = FALSE;
current = NULL;
}
else {
new_element->next = next;
if (current) { //not extracted
current->next = new_element;
if (prev == current)
prev = new_element;
if (current == list->last)
list->last = new_element;
}
else { //current extracted
prev->next = new_element;
if (ex_current_was_last) {
list->last = new_element;
ex_current_was_last = FALSE;
}
}
next = new_element;
}
}
/***********************************************************************
* CLIST_ITERATOR::add_before_then_move
*
* Add a new element to the list before the current element and move the
* iterator to the new element.
**********************************************************************/
inline void CLIST_ITERATOR::add_before_then_move( // element to add
void *new_data) {
CLIST_LINK *new_element;
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::add_before_then_move", ABORT, NULL);
if (!new_data)
BAD_PARAMETER.error ("CLIST_ITERATOR::add_before_then_move", ABORT,
"new_data is NULL");
#endif
new_element = new CLIST_LINK;
new_element->data = new_data;
if (list->empty ()) {
new_element->next = new_element;
list->last = new_element;
prev = next = new_element;
}
else {
prev->next = new_element;
if (current) { //not extracted
new_element->next = current;
next = current;
}
else { //current extracted
new_element->next = next;
if (ex_current_was_last)
list->last = new_element;
if (ex_current_was_cycle_pt)
cycle_pt = new_element;
}
}
current = new_element;
}
/***********************************************************************
* CLIST_ITERATOR::add_before_stay_put
*
* Add a new element to the list before the current element but don't move the
* iterator to the new element.
**********************************************************************/
inline void CLIST_ITERATOR::add_before_stay_put( // element to add
void *new_data) {
CLIST_LINK *new_element;
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::add_before_stay_put", ABORT, NULL);
if (!new_data)
BAD_PARAMETER.error ("CLIST_ITERATOR::add_before_stay_put", ABORT,
"new_data is NULL");
#endif
new_element = new CLIST_LINK;
new_element->data = new_data;
if (list->empty ()) {
new_element->next = new_element;
list->last = new_element;
prev = next = new_element;
ex_current_was_last = TRUE;
current = NULL;
}
else {
prev->next = new_element;
if (current) { //not extracted
new_element->next = current;
if (next == current)
next = new_element;
}
else { //current extracted
new_element->next = next;
if (ex_current_was_last)
list->last = new_element;
}
prev = new_element;
}
}
/***********************************************************************
* CLIST_ITERATOR::add_list_after
*
* Insert another list to this list after the current element but don't move
*the
* iterator.
**********************************************************************/
inline void CLIST_ITERATOR::add_list_after(CLIST *list_to_add) {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::add_list_after", ABORT, NULL);
if (!list_to_add)
BAD_PARAMETER.error ("CLIST_ITERATOR::add_list_after", ABORT,
"list_to_add is NULL");
#endif
if (!list_to_add->empty ()) {
if (list->empty ()) {
list->last = list_to_add->last;
prev = list->last;
next = list->First ();
ex_current_was_last = TRUE;
current = NULL;
}
else {
if (current) { //not extracted
current->next = list_to_add->First ();
if (current == list->last)
list->last = list_to_add->last;
list_to_add->last->next = next;
next = current->next;
}
else { //current extracted
prev->next = list_to_add->First ();
if (ex_current_was_last) {
list->last = list_to_add->last;
ex_current_was_last = FALSE;
}
list_to_add->last->next = next;
next = prev->next;
}
}
list_to_add->last = NULL;
}
}
/***********************************************************************
* CLIST_ITERATOR::add_list_before
*
* Insert another list to this list before the current element. Move the
* iterator to the start of the inserted elements
* iterator.
**********************************************************************/
inline void CLIST_ITERATOR::add_list_before(CLIST *list_to_add) {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::add_list_before", ABORT, NULL);
if (!list_to_add)
BAD_PARAMETER.error ("CLIST_ITERATOR::add_list_before", ABORT,
"list_to_add is NULL");
#endif
if (!list_to_add->empty ()) {
if (list->empty ()) {
list->last = list_to_add->last;
prev = list->last;
current = list->First ();
next = current->next;
ex_current_was_last = FALSE;
}
else {
prev->next = list_to_add->First ();
if (current) { //not extracted
list_to_add->last->next = current;
}
else { //current extracted
list_to_add->last->next = next;
if (ex_current_was_last)
list->last = list_to_add->last;
if (ex_current_was_cycle_pt)
cycle_pt = prev->next;
}
current = prev->next;
next = current->next;
}
list_to_add->last = NULL;
}
}
/***********************************************************************
* CLIST_ITERATOR::extract
*
* Do extraction by removing current from the list, deleting the cons cell
* and returning the data to the caller, but NOT updating the iterator. (So
* that any calling loop can do this.) The iterator's current points to
* NULL. If the data is to be deleted, this is the callers responsibility.
**********************************************************************/
inline void *CLIST_ITERATOR::extract() {
void *extracted_data;
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::extract", ABORT, NULL);
if (!current) //list empty or
//element extracted
NULL_CURRENT.error ("CLIST_ITERATOR::extract",
ABORT, NULL);
#endif
if (list->singleton()) {
// Special case where we do need to change the iterator.
prev = next = list->last = NULL;
} else {
prev->next = next; //remove from list
if (current == list->last) {
list->last = prev;
ex_current_was_last = TRUE;
} else {
ex_current_was_last = FALSE;
}
}
// Always set ex_current_was_cycle_pt so an add/forward will work in a loop.
ex_current_was_cycle_pt = (current == cycle_pt) ? TRUE : FALSE;
extracted_data = current->data;
delete(current); //destroy CONS cell
current = NULL;
return extracted_data;
}
/***********************************************************************
* CLIST_ITERATOR::move_to_first()
*
* Move current so that it is set to the start of the list.
* Return data just in case anyone wants it.
**********************************************************************/
inline void *CLIST_ITERATOR::move_to_first() {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::move_to_first", ABORT, NULL);
#endif
current = list->First ();
prev = list->last;
next = current != NULL ? current->next : NULL;
return current != NULL ? current->data : NULL;
}
/***********************************************************************
* CLIST_ITERATOR::mark_cycle_pt()
*
* Remember the current location so that we can tell whether we've returned
* to this point later.
*
* If the current point is deleted either now, or in the future, the cycle
* point will be set to the next item which is set to current. This could be
* by a forward, add_after_then_move or add_after_then_move.
**********************************************************************/
inline void CLIST_ITERATOR::mark_cycle_pt() {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::mark_cycle_pt", ABORT, NULL);
#endif
if (current)
cycle_pt = current;
else
ex_current_was_cycle_pt = TRUE;
started_cycling = FALSE;
}
/***********************************************************************
* CLIST_ITERATOR::at_first()
*
* Are we at the start of the list?
*
**********************************************************************/
inline BOOL8 CLIST_ITERATOR::at_first() {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::at_first", ABORT, NULL);
#endif
//we're at a deleted
return ((list->empty ()) || (current == list->First ()) || ((current == NULL) &&
(prev == list->last) && //NON-last pt between
!ex_current_was_last)); //first and last
}
/***********************************************************************
* CLIST_ITERATOR::at_last()
*
* Are we at the end of the list?
*
**********************************************************************/
inline BOOL8 CLIST_ITERATOR::at_last() {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::at_last", ABORT, NULL);
#endif
//we're at a deleted
return ((list->empty ()) || (current == list->last) || ((current == NULL) &&
(prev == list->last) && //last point between
ex_current_was_last)); //first and last
}
/***********************************************************************
* CLIST_ITERATOR::cycled_list()
*
* Have we returned to the cycle_pt since it was set?
*
**********************************************************************/
inline BOOL8 CLIST_ITERATOR::cycled_list() {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::cycled_list", ABORT, NULL);
#endif
return ((list->empty ()) || ((current == cycle_pt) && started_cycling));
}
/***********************************************************************
* CLIST_ITERATOR::length()
*
* Return the length of the list
*
**********************************************************************/
inline inT32 CLIST_ITERATOR::length() {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::length", ABORT, NULL);
#endif
return list->length ();
}
/***********************************************************************
* CLIST_ITERATOR::sort()
*
* Sort the elements of the list, then reposition at the start.
*
**********************************************************************/
inline void
CLIST_ITERATOR::sort ( //sort elements
int comparator ( //comparison routine
const void *, const void *)) {
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::sort", ABORT, NULL);
#endif
list->sort (comparator);
move_to_first();
}
/***********************************************************************
* CLIST_ITERATOR::add_to_end
*
* Add a new element to the end of the list without moving the iterator.
* This is provided because a single linked list cannot move to the last as
* the iterator couldn't set its prev pointer. Adding to the end is
* essential for implementing
queues.
**********************************************************************/
inline void CLIST_ITERATOR::add_to_end( // element to add
void *new_data) {
CLIST_LINK *new_element;
#ifndef NDEBUG
if (!list)
NO_LIST.error ("CLIST_ITERATOR::add_to_end", ABORT, NULL);
if (!new_data)
BAD_PARAMETER.error ("CLIST_ITERATOR::add_to_end", ABORT,
"new_data is NULL");
#endif
if (this->at_last ()) {
this->add_after_stay_put (new_data);
}
else {
if (this->at_first ()) {
this->add_before_stay_put (new_data);
list->last = prev;
}
else { //Iteratr is elsewhere
new_element = new CLIST_LINK;
new_element->data = new_data;
new_element->next = list->last->next;
list->last->next = new_element;
list->last = new_element;
}
}
}
/***********************************************************************
QUOTE_IT MACRO DEFINITION
===========================
Replace <parm> with "<parm>". <parm> may be an arbitrary number of tokens
***********************************************************************/
#define QUOTE_IT( parm ) #parm
/***********************************************************************
CLISTIZE( CLASSNAME ) MACRO DEFINITION
======================================
CLASSNAME is assumed to be the name of a class to be used in a CONS list
NOTE: Because we don't use virtual functions in the list code, the list code
will NOT work correctly for classes derived from this.
The macro generates:
- An element deletion function: CLASSNAME##_c1_zapper
- An element copier function:
CLASSNAME##_c1_copier
- A CLIST subclass: CLASSNAME##_CLIST
- A CLIST_ITERATOR subclass:
CLASSNAME##_C_IT
NOTE: Generated names do NOT clash with those generated by ELISTIZE,
ELIST2ISE and CLIST2IZE
Two macros are provided: CLISTIZE and CLISTIZEH
The ...IZEH macros just define the class names for use in .h files
The ...IZE macros define the code use in .c files
***********************************************************************/
/***********************************************************************
CLISTIZEH( CLASSNAME ) MACRO
CLISTIZEH is a concatenation of 3 fragments CLISTIZEH_A, CLISTIZEH_B and
CLISTIZEH_C.
***********************************************************************/
#define CLISTIZEH_A(CLASSNAME) \
\
extern DLLSYM void CLASSNAME##_c1_zapper( /*delete a link*/ \
void *link); /*link to delete*/ \
\
extern DLLSYM void \
*CLASSNAME##_c1_copier( /*deep copy a link*/ \
void *old_element); /*source link */
#define CLISTIZEH_B(CLASSNAME) \
\
/*********************************************************************** \
* CLASS - \
*CLASSNAME##_CLIST \
* \
* List class for class \
*CLASSNAME \
* \
**********************************************************************/ \
\
class DLLSYM CLASSNAME##_CLIST : public CLIST { \
public: \
CLASSNAME##_CLIST() : CLIST() {} \
/* constructor */ \
\
CLASSNAME##_CLIST( /* don't construct */ \
const CLASSNAME##_CLIST &) /*by initial assign*/ \
{ \
DONT_CONSTRUCT_LIST_BY_COPY.error(QUOTE_IT(CLASSNAME##_CLIST), ABORT, \
NULL); \
} \
\
void deep_clear() /* delete elements */ \
{ \
CLIST::internal_deep_clear(&CLASSNAME##_c1_zapper); \
} \
\
void operator=(/* prevent assign */ \
const CLASSNAME##_CLIST &) { \
DONT_ASSIGN_LISTS.error(QUOTE_IT(CLASSNAME##_CLIST), ABORT, NULL); \
}
#define CLISTIZEH_C(CLASSNAME) \
} \
; \
\
/*********************************************************************** \
* CLASS - CLASSNAME##_C_IT \
* \
* Iterator class for class CLASSNAME##_CLIST \
* \
* Note: We don't need to coerce pointers to member functions input \
* parameters as these are automatically converted to the type of the base \
* type. ("A ptr to a class may be converted to a pointer to a public base \
* class of that class") \
**********************************************************************/ \
\
class DLLSYM CLASSNAME##_C_IT : public CLIST_ITERATOR { \
public: \
CLASSNAME##_C_IT() : CLIST_ITERATOR() {} \
\
CLASSNAME##_C_IT(CLASSNAME##_CLIST *list) : CLIST_ITERATOR(list) {} \
\
CLASSNAME *data() { return (CLASSNAME *)CLIST_ITERATOR::data(); } \
\
CLASSNAME *data_relative(inT8 offset) { \
return (CLASSNAME *)CLIST_ITERATOR::data_relative(offset); \
} \
\
CLASSNAME *forward() { return (CLASSNAME *)CLIST_ITERATOR::forward(); } \
\
CLASSNAME *extract() { return (CLASSNAME *)CLIST_ITERATOR::extract(); } \
\
CLASSNAME *move_to_first() { \
return (CLASSNAME *)CLIST_ITERATOR::move_to_first(); \
} \
\
CLASSNAME *move_to_last() { \
return (CLASSNAME *)CLIST_ITERATOR::move_to_last(); \
} \
};
#define CLISTIZEH(CLASSNAME) \
\
CLISTIZEH_A(CLASSNAME) \
\
CLISTIZEH_B(CLASSNAME) \
\
CLISTIZEH_C(CLASSNAME)
/***********************************************************************
CLISTIZE( CLASSNAME ) MACRO
***********************************************************************/
#define CLISTIZE(CLASSNAME) \
\
/*********************************************************************** \
* CLASSNAME##_c1_zapper \
* \
* A function which can delete a CLASSNAME element. This is passed to the \
* generic deep_clear list member function so that when a list is cleared \
*the \
* elements on the list are properly destroyed from the base class, even \
* though we don't use a virtual destructor function. \
**********************************************************************/ \
\
DLLSYM void CLASSNAME##_c1_zapper( /*delete a link*/ \
void *link) /*link to delete*/ \
{ \
delete (CLASSNAME *)link; \
}
#endif
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