158 lines
3.0 KiB
C
158 lines
3.0 KiB
C
/*
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* QList Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "qlist.h"
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#include "qobject.h"
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#include "qemu-queue.h"
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#include "qemu-common.h"
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static void qlist_destroy_obj(QObject *obj);
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static const QType qlist_type = {
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.code = QTYPE_QLIST,
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.destroy = qlist_destroy_obj,
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};
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/**
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* qlist_new(): Create a new QList
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*
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* Return strong reference.
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*/
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QList *qlist_new(void)
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{
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QList *qlist;
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qlist = qemu_malloc(sizeof(*qlist));
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QTAILQ_INIT(&qlist->head);
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QOBJECT_INIT(qlist, &qlist_type);
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return qlist;
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}
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static void qlist_copy_elem(QObject *obj, void *opaque)
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{
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QList *dst = opaque;
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qobject_incref(obj);
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qlist_append_obj(dst, obj);
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}
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QList *qlist_copy(QList *src)
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{
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QList *dst = qlist_new();
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qlist_iter(src, qlist_copy_elem, dst);
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return dst;
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}
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/**
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* qlist_append_obj(): Append an QObject into QList
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*
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* NOTE: ownership of 'value' is transferred to the QList
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*/
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void qlist_append_obj(QList *qlist, QObject *value)
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{
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QListEntry *entry;
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entry = qemu_malloc(sizeof(*entry));
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entry->value = value;
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QTAILQ_INSERT_TAIL(&qlist->head, entry, next);
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}
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/**
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* qlist_iter(): Iterate over all the list's stored values.
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*
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* This function allows the user to provide an iterator, which will be
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* called for each stored value in the list.
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*/
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void qlist_iter(const QList *qlist,
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void (*iter)(QObject *obj, void *opaque), void *opaque)
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{
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QListEntry *entry;
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QTAILQ_FOREACH(entry, &qlist->head, next)
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iter(entry->value, opaque);
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}
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QObject *qlist_pop(QList *qlist)
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{
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QListEntry *entry;
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QObject *ret;
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if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
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return NULL;
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}
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entry = QTAILQ_FIRST(&qlist->head);
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QTAILQ_REMOVE(&qlist->head, entry, next);
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ret = entry->value;
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qemu_free(entry);
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return ret;
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}
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QObject *qlist_peek(QList *qlist)
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{
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QListEntry *entry;
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QObject *ret;
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if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
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return NULL;
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}
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entry = QTAILQ_FIRST(&qlist->head);
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ret = entry->value;
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return ret;
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}
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int qlist_empty(const QList *qlist)
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{
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return QTAILQ_EMPTY(&qlist->head);
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}
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/**
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* qobject_to_qlist(): Convert a QObject into a QList
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*/
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QList *qobject_to_qlist(const QObject *obj)
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{
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if (qobject_type(obj) != QTYPE_QLIST) {
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return NULL;
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}
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return container_of(obj, QList, base);
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}
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/**
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* qlist_destroy_obj(): Free all the memory allocated by a QList
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*/
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static void qlist_destroy_obj(QObject *obj)
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{
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QList *qlist;
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QListEntry *entry, *next_entry;
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assert(obj != NULL);
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qlist = qobject_to_qlist(obj);
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QTAILQ_FOREACH_SAFE(entry, &qlist->head, next, next_entry) {
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QTAILQ_REMOVE(&qlist->head, entry, next);
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qobject_decref(entry->value);
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qemu_free(entry);
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}
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qemu_free(qlist);
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}
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