qstring.c

   1 /*
   2  * QString data type.
   3  *
   4  * Copyright (C) 2009 Red Hat Inc.
   5  *
   6  * Authors:
   7  *  Luiz Capitulino <lcapitulino@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  */
  12 #include "qobject.h"
  13 #include "qstring.h"
  14 #include "qemu-common.h"
  15
  16 static const QType qstring_type;
  17
  18 /**
  19  * qstring_from_str(): Create a new QString from a regular C string
  20  *
  21  * Return strong reference.
  22  */
  23 QString *qstring_from_str(const char *str)
  24 {
  25     QString *qstring;
  26
  27     qstring = qemu_malloc(sizeof(*qstring));
  28     qstring->string = qemu_strdup(str);
  29     QOBJECT_INIT(qstring, &qstring_type);
  30
  31     return qstring;
  32 }
  33
  34 /**
  35  * qobject_to_qstring(): Convert a QObject to a QString
  36  */
  37 QString *qobject_to_qstring(const QObject *obj)
  38 {
  39     if (qobject_type(obj) != QTYPE_QSTRING)
  40         return NULL;
  41
  42     return container_of(obj, QString, base);
  43 }
  44
  45 /**
  46  * qstring_get_str(): Return a pointer to the stored string
  47  *
  48  * NOTE: Should be used with caution, if the object is deallocated
  49  * this pointer becomes invalid.
  50  */
  51 const char *qstring_get_str(const QString *qstring)
  52 {
  53     return qstring->string;
  54 }
  55
  56 /**
  57  * qstring_destroy_obj(): Free all memory allocated by a QString
  58  * object
  59  */
  60 static void qstring_destroy_obj(QObject *obj)
  61 {
  62     QString *qs;
  63
  64     assert(obj != NULL);
  65     qs = qobject_to_qstring(obj);
  66     qemu_free(qs->string);
  67     qemu_free(qs);
  68 }
  69
  70 static const QType qstring_type = {
  71     .code = QTYPE_QSTRING,
  72     .destroy = qstring_destroy_obj,
  73 };