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