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 void qstring_destroy_obj(QObject *obj);
  17
  18 static const QType qstring_type = {
  19     .code = QTYPE_QSTRING,
  20     .destroy = qstring_destroy_obj,
  21 };
  22
  23 /**
  24  * qstring_from_str(): Create a new QString from a regular C string
  25  *
  26  * Return strong reference.
  27  */
  28 QString *qstring_from_str(const char *str)
  29 {
  30     QString *qstring;
  31
  32     qstring = qemu_malloc(sizeof(*qstring));
  33     qstring->string = qemu_strdup(str);
  34     QOBJECT_INIT(qstring, &qstring_type);
  35
  36     return qstring;
  37 }
  38
  39 /**
  40  * qobject_to_qstring(): Convert a QObject to a QString
  41  */
  42 QString *qobject_to_qstring(const QObject *obj)
  43 {
  44     if (qobject_type(obj) != QTYPE_QSTRING)
  45         return NULL;
  46
  47     return container_of(obj, QString, base);
  48 }
  49
  50 /**
  51  * qstring_get_str(): Return a pointer to the stored string
  52  *
  53  * NOTE: Should be used with caution, if the object is deallocated
  54  * this pointer becomes invalid.
  55  */
  56 const char *qstring_get_str(const QString *qstring)
  57 {
  58     return qstring->string;
  59 }
  60
  61 /**
  62  * qstring_destroy_obj(): Free all memory allocated by a QString
  63  * object
  64  */
  65 static void qstring_destroy_obj(QObject *obj)
  66 {
  67     QString *qs;
  68
  69     assert(obj != NULL);
  70     qs = qobject_to_qstring(obj);
  71     qemu_free(qs->string);
  72     qemu_free(qs);
  73 }