1 files changed, 141 insertions, 0 deletions
diff --git a/qobject/qstring.c b/qobject/qstring.c
new file mode 100644
index 0000000000..5f7376c336
--- /dev/null
+++ b/qobject/qstring.c
@@ -0,0 +1,141 @@
+/*
+ * QString 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 "qapi/qmp/qobject.h"
+#include "qapi/qmp/qstring.h"
+#include "qemu-common.h"
+
+static void qstring_destroy_obj(QObject *obj);
+
+static const QType qstring_type = {
+    .code = QTYPE_QSTRING,
+    .destroy = qstring_destroy_obj,
+};
+
+/**
+ * qstring_new(): Create a new empty QString
+ *
+ * Return strong reference.
+ */
+QString *qstring_new(void)
+{
+    return qstring_from_str("");
+}
+
+/**
+ * qstring_from_substr(): Create a new QString from a C string substring
+ *
+ * Return string reference
+ */
+QString *qstring_from_substr(const char *str, int start, int end)
+{
+    QString *qstring;
+
+    qstring = g_malloc(sizeof(*qstring));
+
+    qstring->length = end - start + 1;
+    qstring->capacity = qstring->length;
+
+    qstring->string = g_malloc(qstring->capacity + 1);
+    memcpy(qstring->string, str + start, qstring->length);
+    qstring->string[qstring->length] = 0;
+
+    QOBJECT_INIT(qstring, &qstring_type);
+
+    return qstring;
+}
+
+/**
+ * qstring_from_str(): Create a new QString from a regular C string
+ *
+ * Return strong reference.
+ */
+QString *qstring_from_str(const char *str)
+{
+    return qstring_from_substr(str, 0, strlen(str) - 1);
+}
+
+static void capacity_increase(QString *qstring, size_t len)
+{
+    if (qstring->capacity < (qstring->length + len)) {
+        qstring->capacity += len;
+        qstring->capacity *= 2; /* use exponential growth */
+
+        qstring->string = g_realloc(qstring->string, qstring->capacity + 1);
+    }
+}
+
+/* qstring_append(): Append a C string to a QString
+ */
+void qstring_append(QString *qstring, const char *str)
+{
+    size_t len = strlen(str);
+
+    capacity_increase(qstring, len);
+    memcpy(qstring->string + qstring->length, str, len);
+    qstring->length += len;
+    qstring->string[qstring->length] = 0;
+}
+
+void qstring_append_int(QString *qstring, int64_t value)
+{
+    char num[32];
+
+    snprintf(num, sizeof(num), "%" PRId64, value);
+    qstring_append(qstring, num);
+}
+
+/**
+ * qstring_append_chr(): Append a C char to a QString
+ */
+void qstring_append_chr(QString *qstring, int c)
+{
+    capacity_increase(qstring, 1);
+    qstring->string[qstring->length++] = c;
+    qstring->string[qstring->length] = 0;
+}
+
+/**
+ * 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);
+    g_free(qs->string);
+    g_free(qs);
+}