[Qemu-devel] [PATCH 02/29] Introduce QInt

[Luiz Capitulino <lcapitulino@redhat.com>]

QInt is a high-level data type that can be used to store integers
and perform type-safe conversions.

The following functions are available:

- qint_from_int()   Create a new QInt from an int
- qint_from_int64() Create a new QInt from an int64_t
- qint_to_int()     Export QInt to int
- qint_to_uint64()  Export QInt to uint64_t
- qint_to_uint32()  Export QInt to uint32_t

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 Makefile  |    1 +
 qint.c    |   92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 qint.h    |   20 +++++++++++++
 qobject.h |    1 +
 4 files changed, 114 insertions(+), 0 deletions(-)
 create mode 100644 qint.c
 create mode 100644 qint.h

diff --git a/Makefile b/Makefile
index f6bdf84..d604302 100644
--- a/Makefile
+++ b/Makefile
@@ -90,6 +90,7 @@ obj-y += buffered_file.o migration.o migration-tcp.o net.o qemu-sockets.o
 obj-y += qemu-char.o aio.o net-checksum.o savevm.o
 obj-y += msmouse.o ps2.o
 obj-y += qdev.o qdev-properties.o ssi.o
+obj-y += qint.o
 
 obj-$(CONFIG_BRLAPI) += baum.o
 obj-$(CONFIG_WIN32) += tap-win32.o
diff --git a/qint.c b/qint.c
new file mode 100644
index 0000000..8398824
--- /dev/null
+++ b/qint.c
@@ -0,0 +1,92 @@
+/*
+ * QInt data type.
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+#include "qint.h"
+#include "qobject.h"
+#include "qemu-common.h"
+
+static const QType qint_type;
+
+/**
+ * qint_from_int64(): Create a new QInt from an int64_t
+ *
+ * Return new reference.
+ */
+QInt *qint_from_int64(int64_t value)
+{
+    QInt *qi;
+
+    qi = qemu_malloc(sizeof(*qi));
+    qi->number = value;
+    QOBJECT_INIT(qi, &qint_type);
+
+    return qi;
+}
+
+/**
+ * qint_from_int(): Create a new QInt from an int
+ *
+ * Return new reference.
+ */
+QInt *qint_from_int(int value)
+{
+    return qint_from_int64(value);
+}
+
+/**
+ * qint_to_int(): Export QInt to int type
+ */
+int qint_to_int(const QInt *qi)
+{
+    return qi->number;
+}
+
+/**
+ * qint_to_uint32(): Export QInt to uint32_t type
+ */
+uint32_t qint_to_uint32(const QInt *qi)
+{
+    return qi->number;
+}
+
+/**
+ * qint_to_uint64(): Export QInt to uint64_t type
+ */
+uint64_t qint_to_uint64(const QInt *qi)
+{
+    return qi->number;
+}
+
+/**
+ * qobject_to_qint(): Convert a QObject into a QInt
+ */
+QInt *qobject_to_qint(const QObject *obj)
+{
+    if (qobject_type(obj) != QTYPE_QINT)
+        return NULL;
+
+    return container_of(obj, QInt, base);
+}
+
+/**
+ * qint_destroy_obj(): Free all memory allocated by a
+ * QInt object
+ */
+static void qint_destroy_obj(QObject *obj)
+{
+    assert(obj != NULL);
+    qemu_free(qobject_to_qint(obj));
+}
+
+static const QType qint_type = {
+    .code = QTYPE_QINT,
+    .destroy = qint_destroy_obj,
+};
diff --git a/qint.h b/qint.h
new file mode 100644
index 0000000..1307761
--- /dev/null
+++ b/qint.h
@@ -0,0 +1,20 @@
+#ifndef QINT_H
+#define QINT_H
+
+#include "qobject.h"
+#include "qemu-common.h"
+#include <stdint.h>
+
+typedef struct QInt {
+    QType_HEAD
+    int64_t number;
+} QInt;
+
+QInt *qint_from_int(int value);
+QInt *qint_from_int64(int64_t value);
+int qint_to_int(const QInt *qi);
+uint32_t qint_to_uint32(const QInt *qi);
+uint64_t qint_to_uint64(const QInt *qi);
+QInt *qobject_to_qint(const QObject *obj);
+
+#endif /* QINT_H */
diff --git a/qobject.h b/qobject.h
index c23b5f3..8ff7bfd 100644
--- a/qobject.h
+++ b/qobject.h
@@ -41,6 +41,7 @@
 
 typedef enum {
     QTYPE_NONE,
+    QTYPE_QINT,
 } qtype_code;
 
 struct QObject;
-- 
1.6.4.67.gea5b1