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authorLuiz Capitulino <lcapitulino@redhat.com>2009-08-28 15:27:06 -0300
committerAnthony Liguori <aliguori@us.ibm.com>2009-09-04 09:37:29 -0500
commit66f7048712693a6ff877209c1ff36aa8eadf2eb5 (patch)
treecd499ffb8fcb8082aea9da83cc8911bed884a688 /qstring.c
parentIntroduce QInt (diff)
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Introduce QString
QString is a high-level data type that can be used to represent C strings. The following functions are available: - qstring_from_str() Create a new QString - qstring_get_str() Get a pointer to the stored string Note that qstring_get_str() is too low-level for a data type like this, but it's interesting for quick read-only accesses. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'qstring.c')
-rw-r--r--qstring.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/qstring.c b/qstring.c
new file mode 100644
index 000000000..9fa2e3024
--- /dev/null
+++ b/qstring.c
@@ -0,0 +1,73 @@
+/*
+ * QString 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 "qobject.h"
+#include "qstring.h"
+#include "qemu-common.h"
+
+static const QType qstring_type;
+
+/**
+ * qstring_from_str(): Create a new QString from a regular C string
+ *
+ * Return strong reference.
+ */
+QString *qstring_from_str(const char *str)
+{
+ QString *qstring;
+
+ qstring = qemu_malloc(sizeof(*qstring));
+ qstring->string = qemu_strdup(str);
+ QOBJECT_INIT(qstring, &qstring_type);
+
+ return qstring;
+}
+
+/**
+ * qobject_to_qstring(): Convert a QObject to a QString
+ */
+QString *qobject_to_qstring(const QObject *obj)
+{
+ if (qobject_type(obj) != QTYPE_QSTRING)
+ return NULL;
+
+ return container_of(obj, QString, base);
+}
+
+/**
+ * qstring_get_str(): Return a pointer to the stored string
+ *
+ * NOTE: Should be used with caution, if the object is deallocated
+ * this pointer becomes invalid.
+ */
+const char *qstring_get_str(const QString *qstring)
+{
+ return qstring->string;
+}
+
+/**
+ * qstring_destroy_obj(): Free all memory allocated by a QString
+ * object
+ */
+static void qstring_destroy_obj(QObject *obj)
+{
+ QString *qs;
+
+ assert(obj != NULL);
+ qs = qobject_to_qstring(obj);
+ qemu_free(qs->string);
+ qemu_free(qs);
+}
+
+static const QType qstring_type = {
+ .code = QTYPE_QSTRING,
+ .destroy = qstring_destroy_obj,
+};