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spl_dllist.c
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2016 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Etienne Kneuss <[email protected]> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "php.h"
#include "zend_exceptions.h"
#include "zend_hash.h"
#include "php_spl.h"
#include "ext/standard/info.h"
#include "ext/standard/php_var.h"
#include "zend_smart_str.h"
#include "spl_functions.h"
#include "spl_engine.h"
#include "spl_iterators.h"
#include "spl_dllist.h"
#include "spl_exceptions.h"
zend_object_handlers spl_handler_SplDoublyLinkedList;
PHPAPI zend_class_entry *spl_ce_SplDoublyLinkedList;
PHPAPI zend_class_entry *spl_ce_SplQueue;
PHPAPI zend_class_entry *spl_ce_SplStack;
#define SPL_LLIST_DELREF(elem) if(!--(elem)->rc) { \
efree(elem); \
}
#define SPL_LLIST_CHECK_DELREF(elem) if((elem) && !--(elem)->rc) { \
efree(elem); \
}
#define SPL_LLIST_ADDREF(elem) (elem)->rc++
#define SPL_LLIST_CHECK_ADDREF(elem) if(elem) (elem)->rc++
#define SPL_DLLIST_IT_DELETE 0x00000001 /* Delete flag makes the iterator delete the current element on next */
#define SPL_DLLIST_IT_LIFO 0x00000002 /* LIFO flag makes the iterator traverse the structure as a LastInFirstOut */
#define SPL_DLLIST_IT_MASK 0x00000003 /* Mask to isolate flags related to iterators */
#define SPL_DLLIST_IT_FIX 0x00000004 /* Backward/Forward bit is fixed */
#ifdef accept
#undef accept
#endif
typedef struct _spl_ptr_llist_element {
struct _spl_ptr_llist_element *prev;
struct _spl_ptr_llist_element *next;
int rc;
zval data;
} spl_ptr_llist_element;
typedef void (*spl_ptr_llist_dtor_func)(spl_ptr_llist_element *);
typedef void (*spl_ptr_llist_ctor_func)(spl_ptr_llist_element *);
typedef struct _spl_ptr_llist {
spl_ptr_llist_element *head;
spl_ptr_llist_element *tail;
spl_ptr_llist_dtor_func dtor;
spl_ptr_llist_ctor_func ctor;
int count;
} spl_ptr_llist;
typedef struct _spl_dllist_object spl_dllist_object;
typedef struct _spl_dllist_it spl_dllist_it;
struct _spl_dllist_object {
spl_ptr_llist *llist;
int traverse_position;
spl_ptr_llist_element *traverse_pointer;
int flags;
zend_function *fptr_offset_get;
zend_function *fptr_offset_set;
zend_function *fptr_offset_has;
zend_function *fptr_offset_del;
zend_function *fptr_count;
zend_class_entry *ce_get_iterator;
zval *gc_data;
int gc_data_count;
zend_object std;
};
/* define an overloaded iterator structure */
struct _spl_dllist_it {
zend_user_iterator intern;
spl_ptr_llist_element *traverse_pointer;
int traverse_position;
int flags;
};
static inline spl_dllist_object *spl_dllist_from_obj(zend_object *obj) /* {{{ */ {
return (spl_dllist_object*)((char*)(obj) - XtOffsetOf(spl_dllist_object, std));
}
/* }}} */
#define Z_SPLDLLIST_P(zv) spl_dllist_from_obj(Z_OBJ_P((zv)))
/* {{{ spl_ptr_llist */
static void spl_ptr_llist_zval_dtor(spl_ptr_llist_element *elem) { /* {{{ */
if (!Z_ISUNDEF(elem->data)) {
zval_ptr_dtor(&elem->data);
ZVAL_UNDEF(&elem->data);
}
}
/* }}} */
static void spl_ptr_llist_zval_ctor(spl_ptr_llist_element *elem) { /* {{{ */
if (Z_REFCOUNTED(elem->data)) {
Z_ADDREF(elem->data);
}
}
/* }}} */
static spl_ptr_llist *spl_ptr_llist_init(spl_ptr_llist_ctor_func ctor, spl_ptr_llist_dtor_func dtor) /* {{{ */
{
spl_ptr_llist *llist = emalloc(sizeof(spl_ptr_llist));
llist->head = NULL;
llist->tail = NULL;
llist->count = 0;
llist->dtor = dtor;
llist->ctor = ctor;
return llist;
}
/* }}} */
static zend_long spl_ptr_llist_count(spl_ptr_llist *llist) /* {{{ */
{
return (zend_long)llist->count;
}
/* }}} */
static void spl_ptr_llist_destroy(spl_ptr_llist *llist) /* {{{ */
{
spl_ptr_llist_element *current = llist->head, *next;
spl_ptr_llist_dtor_func dtor = llist->dtor;
while (current) {
next = current->next;
if (dtor) {
dtor(current);
}
SPL_LLIST_DELREF(current);
current = next;
}
efree(llist);
}
/* }}} */
static spl_ptr_llist_element *spl_ptr_llist_offset(spl_ptr_llist *llist, zend_long offset, int backward) /* {{{ */
{
spl_ptr_llist_element *current;
int pos = 0;
if (backward) {
current = llist->tail;
} else {
current = llist->head;
}
while (current && pos < offset) {
pos++;
if (backward) {
current = current->prev;
} else {
current = current->next;
}
}
return current;
}
/* }}} */
static void spl_ptr_llist_unshift(spl_ptr_llist *llist, zval *data) /* {{{ */
{
spl_ptr_llist_element *elem = emalloc(sizeof(spl_ptr_llist_element));
elem->rc = 1;
elem->prev = NULL;
elem->next = llist->head;
ZVAL_COPY_VALUE(&elem->data, data);
if (llist->head) {
llist->head->prev = elem;
} else {
llist->tail = elem;
}
llist->head = elem;
llist->count++;
if (llist->ctor) {
llist->ctor(elem);
}
}
/* }}} */
static void spl_ptr_llist_push(spl_ptr_llist *llist, zval *data) /* {{{ */
{
spl_ptr_llist_element *elem = emalloc(sizeof(spl_ptr_llist_element));
elem->rc = 1;
elem->prev = llist->tail;
elem->next = NULL;
ZVAL_COPY_VALUE(&elem->data, data);
if (llist->tail) {
llist->tail->next = elem;
} else {
llist->head = elem;
}
llist->tail = elem;
llist->count++;
if (llist->ctor) {
llist->ctor(elem);
}
}
/* }}} */
static void spl_ptr_llist_pop(spl_ptr_llist *llist, zval *ret) /* {{{ */
{
spl_ptr_llist_element *tail = llist->tail;
if (tail == NULL) {
ZVAL_UNDEF(ret);
return;
}
if (tail->prev) {
tail->prev->next = NULL;
} else {
llist->head = NULL;
}
llist->tail = tail->prev;
llist->count--;
ZVAL_COPY(ret, &tail->data);
if (llist->dtor) {
llist->dtor(tail);
}
ZVAL_UNDEF(&tail->data);
SPL_LLIST_DELREF(tail);
}
/* }}} */
static zval *spl_ptr_llist_last(spl_ptr_llist *llist) /* {{{ */
{
spl_ptr_llist_element *tail = llist->tail;
if (tail == NULL) {
return NULL;
} else {
return &tail->data;
}
}
/* }}} */
static zval *spl_ptr_llist_first(spl_ptr_llist *llist) /* {{{ */
{
spl_ptr_llist_element *head = llist->head;
if (head == NULL) {
return NULL;
} else {
return &head->data;
}
}
/* }}} */
static void spl_ptr_llist_shift(spl_ptr_llist *llist, zval *ret) /* {{{ */
{
spl_ptr_llist_element *head = llist->head;
if (head == NULL) {
ZVAL_UNDEF(ret);
return;
}
if (head->next) {
head->next->prev = NULL;
} else {
llist->tail = NULL;
}
llist->head = head->next;
llist->count--;
ZVAL_COPY(ret, &head->data);
if (llist->dtor) {
llist->dtor(head);
}
ZVAL_UNDEF(&head->data);
SPL_LLIST_DELREF(head);
}
/* }}} */
static void spl_ptr_llist_copy(spl_ptr_llist *from, spl_ptr_llist *to) /* {{{ */
{
spl_ptr_llist_element *current = from->head, *next;
//??? spl_ptr_llist_ctor_func ctor = from->ctor;
while (current) {
next = current->next;
/*??? FIXME
if (ctor) {
ctor(current);
}
*/
spl_ptr_llist_push(to, ¤t->data);
current = next;
}
}
/* }}} */
/* }}} */
static void spl_dllist_object_free_storage(zend_object *object) /* {{{ */
{
spl_dllist_object *intern = spl_dllist_from_obj(object);
zval tmp;
zend_object_std_dtor(&intern->std);
while (intern->llist->count > 0) {
spl_ptr_llist_pop(intern->llist, &tmp);
zval_ptr_dtor(&tmp);
}
if (intern->gc_data != NULL) {
efree(intern->gc_data);
};
spl_ptr_llist_destroy(intern->llist);
SPL_LLIST_CHECK_DELREF(intern->traverse_pointer);
}
/* }}} */
zend_object_iterator *spl_dllist_get_iterator(zend_class_entry *ce, zval *object, int by_ref);
static zend_object *spl_dllist_object_new_ex(zend_class_entry *class_type, zval *orig, int clone_orig) /* {{{ */
{
spl_dllist_object *intern;
zend_class_entry *parent = class_type;
int inherited = 0;
intern = ecalloc(1, sizeof(spl_dllist_object) + zend_object_properties_size(parent));
zend_object_std_init(&intern->std, class_type);
object_properties_init(&intern->std, class_type);
intern->flags = 0;
intern->traverse_position = 0;
if (orig) {
spl_dllist_object *other = Z_SPLDLLIST_P(orig);
intern->ce_get_iterator = other->ce_get_iterator;
if (clone_orig) {
intern->llist = (spl_ptr_llist *)spl_ptr_llist_init(other->llist->ctor, other->llist->dtor);
spl_ptr_llist_copy(other->llist, intern->llist);
intern->traverse_pointer = intern->llist->head;
SPL_LLIST_CHECK_ADDREF(intern->traverse_pointer);
} else {
intern->llist = other->llist;
intern->traverse_pointer = intern->llist->head;
SPL_LLIST_CHECK_ADDREF(intern->traverse_pointer);
}
intern->flags = other->flags;
} else {
intern->llist = (spl_ptr_llist *)spl_ptr_llist_init(spl_ptr_llist_zval_ctor, spl_ptr_llist_zval_dtor);
intern->traverse_pointer = intern->llist->head;
SPL_LLIST_CHECK_ADDREF(intern->traverse_pointer);
}
while (parent) {
if (parent == spl_ce_SplStack) {
intern->flags |= (SPL_DLLIST_IT_FIX | SPL_DLLIST_IT_LIFO);
intern->std.handlers = &spl_handler_SplDoublyLinkedList;
} else if (parent == spl_ce_SplQueue) {
intern->flags |= SPL_DLLIST_IT_FIX;
intern->std.handlers = &spl_handler_SplDoublyLinkedList;
}
if (parent == spl_ce_SplDoublyLinkedList) {
intern->std.handlers = &spl_handler_SplDoublyLinkedList;
break;
}
parent = parent->parent;
inherited = 1;
}
if (!parent) { /* this must never happen */
php_error_docref(NULL, E_COMPILE_ERROR, "Internal compiler error, Class is not child of SplDoublyLinkedList");
}
if (inherited) {
intern->fptr_offset_get = zend_hash_str_find_ptr(&class_type->function_table, "offsetget", sizeof("offsetget") - 1);
if (intern->fptr_offset_get->common.scope == parent) {
intern->fptr_offset_get = NULL;
}
intern->fptr_offset_set = zend_hash_str_find_ptr(&class_type->function_table, "offsetset", sizeof("offsetset") - 1);
if (intern->fptr_offset_set->common.scope == parent) {
intern->fptr_offset_set = NULL;
}
intern->fptr_offset_has = zend_hash_str_find_ptr(&class_type->function_table, "offsetexists", sizeof("offsetexists") - 1);
if (intern->fptr_offset_has->common.scope == parent) {
intern->fptr_offset_has = NULL;
}
intern->fptr_offset_del = zend_hash_str_find_ptr(&class_type->function_table, "offsetunset", sizeof("offsetunset") - 1);
if (intern->fptr_offset_del->common.scope == parent) {
intern->fptr_offset_del = NULL;
}
intern->fptr_count = zend_hash_str_find_ptr(&class_type->function_table, "count", sizeof("count") - 1);
if (intern->fptr_count->common.scope == parent) {
intern->fptr_count = NULL;
}
}
return &intern->std;
}
/* }}} */
static zend_object *spl_dllist_object_new(zend_class_entry *class_type) /* {{{ */
{
return spl_dllist_object_new_ex(class_type, NULL, 0);
}
/* }}} */
static zend_object *spl_dllist_object_clone(zval *zobject) /* {{{ */
{
zend_object *old_object;
zend_object *new_object;
old_object = Z_OBJ_P(zobject);
new_object = spl_dllist_object_new_ex(old_object->ce, zobject, 1);
zend_objects_clone_members(new_object, old_object);
return new_object;
}
/* }}} */
static int spl_dllist_object_count_elements(zval *object, zend_long *count) /* {{{ */
{
spl_dllist_object *intern = Z_SPLDLLIST_P(object);
if (intern->fptr_count) {
zval rv;
zend_call_method_with_0_params(object, intern->std.ce, &intern->fptr_count, "count", &rv);
if (!Z_ISUNDEF(rv)) {
*count = zval_get_long(&rv);
zval_ptr_dtor(&rv);
return SUCCESS;
}
*count = 0;
return FAILURE;
}
*count = spl_ptr_llist_count(intern->llist);
return SUCCESS;
}
/* }}} */
static HashTable* spl_dllist_object_get_debug_info(zval *obj, int *is_temp) /* {{{{ */
{
spl_dllist_object *intern = Z_SPLDLLIST_P(obj);
spl_ptr_llist_element *current = intern->llist->head, *next;
zval tmp, dllist_array;
zend_string *pnstr;
int i = 0;
HashTable *debug_info;
*is_temp = 1;
if (!intern->std.properties) {
rebuild_object_properties(&intern->std);
}
ALLOC_HASHTABLE(debug_info);
zend_hash_init(debug_info, 1, NULL, ZVAL_PTR_DTOR, 0);
zend_hash_copy(debug_info, intern->std.properties, (copy_ctor_func_t) zval_add_ref);
pnstr = spl_gen_private_prop_name(spl_ce_SplDoublyLinkedList, "flags", sizeof("flags")-1);
ZVAL_LONG(&tmp, intern->flags);
zend_hash_add(debug_info, pnstr, &tmp);
zend_string_release(pnstr);
array_init(&dllist_array);
while (current) {
next = current->next;
add_index_zval(&dllist_array, i, ¤t->data);
if (Z_REFCOUNTED(current->data)) {
Z_ADDREF(current->data);
}
i++;
current = next;
}
pnstr = spl_gen_private_prop_name(spl_ce_SplDoublyLinkedList, "dllist", sizeof("dllist")-1);
zend_hash_add(debug_info, pnstr, &dllist_array);
zend_string_release(pnstr);
return debug_info;
}
/* }}}} */
static HashTable *spl_dllist_object_get_gc(zval *obj, zval **gc_data, int *gc_data_count) /* {{{ */
{
spl_dllist_object *intern = Z_SPLDLLIST_P(obj);
spl_ptr_llist_element *current = intern->llist->head;
int i = 0;
if (intern->gc_data_count < intern->llist->count) {
intern->gc_data_count = intern->llist->count;
intern->gc_data = safe_erealloc(intern->gc_data, intern->gc_data_count, sizeof(zval), 0);
}
while (current) {
ZVAL_COPY_VALUE(&intern->gc_data[i++], ¤t->data);
current = current->next;
}
*gc_data = intern->gc_data;
*gc_data_count = i;
return zend_std_get_properties(obj);
}
/* }}} */
/* {{{ proto bool SplDoublyLinkedList::push(mixed value)
Push $value on the SplDoublyLinkedList */
SPL_METHOD(SplDoublyLinkedList, push)
{
zval *value;
spl_dllist_object *intern;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "z", &value) == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
spl_ptr_llist_push(intern->llist, value);
RETURN_TRUE;
}
/* }}} */
/* {{{ proto bool SplDoublyLinkedList::unshift(mixed value)
Unshift $value on the SplDoublyLinkedList */
SPL_METHOD(SplDoublyLinkedList, unshift)
{
zval *value;
spl_dllist_object *intern;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "z", &value) == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
spl_ptr_llist_unshift(intern->llist, value);
RETURN_TRUE;
}
/* }}} */
/* {{{ proto mixed SplDoublyLinkedList::pop()
Pop an element out of the SplDoublyLinkedList */
SPL_METHOD(SplDoublyLinkedList, pop)
{
spl_dllist_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
spl_ptr_llist_pop(intern->llist, return_value);
if (Z_ISUNDEF_P(return_value)) {
zend_throw_exception(spl_ce_RuntimeException, "Can't pop from an empty datastructure", 0);
RETURN_NULL();
}
}
/* }}} */
/* {{{ proto mixed SplDoublyLinkedList::shift()
Shift an element out of the SplDoublyLinkedList */
SPL_METHOD(SplDoublyLinkedList, shift)
{
spl_dllist_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
spl_ptr_llist_shift(intern->llist, return_value);
if (Z_ISUNDEF_P(return_value)) {
zend_throw_exception(spl_ce_RuntimeException, "Can't shift from an empty datastructure", 0);
RETURN_NULL();
}
}
/* }}} */
/* {{{ proto mixed SplDoublyLinkedList::top()
Peek at the top element of the SplDoublyLinkedList */
SPL_METHOD(SplDoublyLinkedList, top)
{
zval *value;
spl_dllist_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
value = spl_ptr_llist_last(intern->llist);
if (value == NULL || Z_ISUNDEF_P(value)) {
zend_throw_exception(spl_ce_RuntimeException, "Can't peek at an empty datastructure", 0);
return;
}
ZVAL_DEREF(value);
ZVAL_COPY(return_value, value);
}
/* }}} */
/* {{{ proto mixed SplDoublyLinkedList::bottom()
Peek at the bottom element of the SplDoublyLinkedList */
SPL_METHOD(SplDoublyLinkedList, bottom)
{
zval *value;
spl_dllist_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
value = spl_ptr_llist_first(intern->llist);
if (value == NULL || Z_ISUNDEF_P(value)) {
zend_throw_exception(spl_ce_RuntimeException, "Can't peek at an empty datastructure", 0);
return;
}
ZVAL_DEREF(value);
ZVAL_COPY(return_value, value);
}
/* }}} */
/* {{{ proto int SplDoublyLinkedList::count()
Return the number of elements in the datastructure. */
SPL_METHOD(SplDoublyLinkedList, count)
{
zend_long count;
spl_dllist_object *intern = Z_SPLDLLIST_P(getThis());
if (zend_parse_parameters_none() == FAILURE) {
return;
}
count = spl_ptr_llist_count(intern->llist);
RETURN_LONG(count);
}
/* }}} */
/* {{{ proto int SplDoublyLinkedList::isEmpty()
Return true if the SplDoublyLinkedList is empty. */
SPL_METHOD(SplDoublyLinkedList, isEmpty)
{
zend_long count;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
spl_dllist_object_count_elements(getThis(), &count);
RETURN_BOOL(count == 0);
}
/* }}} */
/* {{{ proto int SplDoublyLinkedList::setIteratorMode(int flags)
Set the mode of iteration */
SPL_METHOD(SplDoublyLinkedList, setIteratorMode)
{
zend_long value;
spl_dllist_object *intern;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &value) == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
if (intern->flags & SPL_DLLIST_IT_FIX
&& (intern->flags & SPL_DLLIST_IT_LIFO) != (value & SPL_DLLIST_IT_LIFO)) {
zend_throw_exception(spl_ce_RuntimeException, "Iterators' LIFO/FIFO modes for SplStack/SplQueue objects are frozen", 0);
return;
}
intern->flags = value & SPL_DLLIST_IT_MASK;
RETURN_LONG(intern->flags);
}
/* }}} */
/* {{{ proto int SplDoublyLinkedList::getIteratorMode()
Return the mode of iteration */
SPL_METHOD(SplDoublyLinkedList, getIteratorMode)
{
spl_dllist_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
RETURN_LONG(intern->flags);
}
/* }}} */
/* {{{ proto bool SplDoublyLinkedList::offsetExists(mixed index)
Returns whether the requested $index exists. */
SPL_METHOD(SplDoublyLinkedList, offsetExists)
{
zval *zindex;
spl_dllist_object *intern;
zend_long index;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "z", &zindex) == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
index = spl_offset_convert_to_long(zindex);
RETURN_BOOL(index >= 0 && index < intern->llist->count);
} /* }}} */
/* {{{ proto mixed SplDoublyLinkedList::offsetGet(mixed index)
Returns the value at the specified $index. */
SPL_METHOD(SplDoublyLinkedList, offsetGet)
{
zval *zindex;
zend_long index;
spl_dllist_object *intern;
spl_ptr_llist_element *element;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "z", &zindex) == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
index = spl_offset_convert_to_long(zindex);
if (index < 0 || index >= intern->llist->count) {
zend_throw_exception(spl_ce_OutOfRangeException, "Offset invalid or out of range", 0);
return;
}
element = spl_ptr_llist_offset(intern->llist, index, intern->flags & SPL_DLLIST_IT_LIFO);
if (element != NULL) {
zval *value = &element->data;
ZVAL_DEREF(value);
ZVAL_COPY(return_value, value);
} else {
zend_throw_exception(spl_ce_OutOfRangeException, "Offset invalid", 0);
}
} /* }}} */
/* {{{ proto void SplDoublyLinkedList::offsetSet(mixed index, mixed newval)
Sets the value at the specified $index to $newval. */
SPL_METHOD(SplDoublyLinkedList, offsetSet)
{
zval *zindex, *value;
spl_dllist_object *intern;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "zz", &zindex, &value) == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
if (Z_TYPE_P(zindex) == IS_NULL) {
/* $obj[] = ... */
spl_ptr_llist_push(intern->llist, value);
} else {
/* $obj[$foo] = ... */
zend_long index;
spl_ptr_llist_element *element;
index = spl_offset_convert_to_long(zindex);
if (index < 0 || index >= intern->llist->count) {
zend_throw_exception(spl_ce_OutOfRangeException, "Offset invalid or out of range", 0);
return;
}
element = spl_ptr_llist_offset(intern->llist, index, intern->flags & SPL_DLLIST_IT_LIFO);
if (element != NULL) {
/* call dtor on the old element as in spl_ptr_llist_pop */
if (intern->llist->dtor) {
intern->llist->dtor(element);
}
/* the element is replaced, delref the old one as in
* SplDoublyLinkedList::pop() */
zval_ptr_dtor(&element->data);
ZVAL_COPY_VALUE(&element->data, value);
/* new element, call ctor as in spl_ptr_llist_push */
if (intern->llist->ctor) {
intern->llist->ctor(element);
}
} else {
zval_ptr_dtor(value);
zend_throw_exception(spl_ce_OutOfRangeException, "Offset invalid", 0);
return;
}
}
} /* }}} */
/* {{{ proto void SplDoublyLinkedList::offsetUnset(mixed index)
Unsets the value at the specified $index. */
SPL_METHOD(SplDoublyLinkedList, offsetUnset)
{
zval *zindex;
zend_long index;
spl_dllist_object *intern;
spl_ptr_llist_element *element;
spl_ptr_llist *llist;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "z", &zindex) == FAILURE) {
return;
}
intern = Z_SPLDLLIST_P(getThis());
index = spl_offset_convert_to_long(zindex);
llist = intern->llist;
if (index < 0 || index >= intern->llist->count) {
zend_throw_exception(spl_ce_OutOfRangeException, "Offset out of range", 0);
return;
}
element = spl_ptr_llist_offset(intern->llist, index, intern->flags & SPL_DLLIST_IT_LIFO);
if (element != NULL) {
/* connect the neightbors */
if (element->prev) {
element->prev->next = element->next;
}
if (element->next) {
element->next->prev = element->prev;
}
/* take care of head/tail */
if (element == llist->head) {
llist->head = element->next;
}
if (element == llist->tail) {
llist->tail = element->prev;
}
/* finally, delete the element */
llist->count--;
if(llist->dtor) {
llist->dtor(element);
}
if (intern->traverse_pointer == element) {
SPL_LLIST_DELREF(element);
intern->traverse_pointer = NULL;
}
zval_ptr_dtor(&element->data);
ZVAL_UNDEF(&element->data);
SPL_LLIST_DELREF(element);
} else {
zend_throw_exception(spl_ce_OutOfRangeException, "Offset invalid", 0);
return;
}
} /* }}} */
static void spl_dllist_it_dtor(zend_object_iterator *iter) /* {{{ */
{
spl_dllist_it *iterator = (spl_dllist_it *)iter;
SPL_LLIST_CHECK_DELREF(iterator->traverse_pointer);
zend_user_it_invalidate_current(iter);
zval_ptr_dtor(&iterator->intern.it.data);
}
/* }}} */
static void spl_dllist_it_helper_rewind(spl_ptr_llist_element **traverse_pointer_ptr, int *traverse_position_ptr, spl_ptr_llist *llist, int flags) /* {{{ */
{
SPL_LLIST_CHECK_DELREF(*traverse_pointer_ptr);
if (flags & SPL_DLLIST_IT_LIFO) {
*traverse_position_ptr = llist->count-1;
*traverse_pointer_ptr = llist->tail;
} else {
*traverse_position_ptr = 0;
*traverse_pointer_ptr = llist->head;
}
SPL_LLIST_CHECK_ADDREF(*traverse_pointer_ptr);
}
/* }}} */
static void spl_dllist_it_helper_move_forward(spl_ptr_llist_element **traverse_pointer_ptr, int *traverse_position_ptr, spl_ptr_llist *llist, int flags) /* {{{ */
{
if (*traverse_pointer_ptr) {
spl_ptr_llist_element *old = *traverse_pointer_ptr;
if (flags & SPL_DLLIST_IT_LIFO) {
*traverse_pointer_ptr = old->prev;
(*traverse_position_ptr)--;
if (flags & SPL_DLLIST_IT_DELETE) {
zval prev;
spl_ptr_llist_pop(llist, &prev);
zval_ptr_dtor(&prev);
}
} else {
*traverse_pointer_ptr = old->next;
if (flags & SPL_DLLIST_IT_DELETE) {
zval prev;
spl_ptr_llist_shift(llist, &prev);
zval_ptr_dtor(&prev);
} else {
(*traverse_position_ptr)++;
}
}
SPL_LLIST_DELREF(old);
SPL_LLIST_CHECK_ADDREF(*traverse_pointer_ptr);
}
}
/* }}} */
static void spl_dllist_it_rewind(zend_object_iterator *iter) /* {{{ */
{
spl_dllist_it *iterator = (spl_dllist_it *)iter;
spl_dllist_object *object = Z_SPLDLLIST_P(&iter->data);
spl_ptr_llist *llist = object->llist;
spl_dllist_it_helper_rewind(&iterator->traverse_pointer, &iterator->traverse_position, llist, object->flags);
}
/* }}} */
static int spl_dllist_it_valid(zend_object_iterator *iter) /* {{{ */
{
spl_dllist_it *iterator = (spl_dllist_it *)iter;