qobject/qstring.c

   1 /*
   2  * QString Module
   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 LGPL, version 2.1 or later.
  10  * See the COPYING.LIB file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qapi/qmp/qstring.h"
  15 #include "qobject-internal.h"
  16
  17 /**
  18  * qstring_new(): Create a new empty QString
  19  *
  20  * Return strong reference.
  21  */
  22 QString *qstring_new(void)
  23 {
  24     return qstring_from_str("");
  25 }
  26
  27 /**
  28  * qstring_from_substr(): Create a new QString from a C string substring
  29  *
  30  * Return string reference
  31  */
  32 QString *qstring_from_substr(const char *str, size_t start, size_t end)
  33 {
  34     QString *qstring;
  35
  36     assert(start <= end);
  37     qstring = g_malloc(sizeof(*qstring));
  38     qobject_init(QOBJECT(qstring), QTYPE_QSTRING);
  39     qstring->string = g_strndup(str + start, end - start);
  40     return qstring;
  41 }
  42
  43 /**
  44  * qstring_from_str(): Create a new QString from a regular C string
  45  *
  46  * Return strong reference.
  47  */
  48 QString *qstring_from_str(const char *str)
  49 {
  50     return qstring_from_substr(str, 0, strlen(str));
  51 }
  52
  53 /**
  54  * qstring_from_gstring(): Convert a GString to a QString
  55  *
  56  * Return strong reference.
  57  */
  58
  59 QString *qstring_from_gstring(GString *gstr)
  60 {
  61     QString *qstring;
  62
  63     qstring = g_malloc(sizeof(*qstring));
  64     qobject_init(QOBJECT(qstring), QTYPE_QSTRING);
  65     qstring->string = g_string_free(gstr, false);
  66     return qstring;
  67 }
  68
  69
  70 /**
  71  * qstring_get_str(): Return a pointer to the stored string
  72  *
  73  * NOTE: Should be used with caution, if the object is deallocated
  74  * this pointer becomes invalid.
  75  */
  76 const char *qstring_get_str(const QString *qstring)
  77 {
  78     return qstring->string;
  79 }
  80
  81 /**
  82  * qstring_is_equal(): Test whether the two QStrings are equal
  83  */
  84 bool qstring_is_equal(const QObject *x, const QObject *y)
  85 {
  86     return !strcmp(qobject_to(QString, x)->string,
  87                    qobject_to(QString, y)->string);
  88 }
  89
  90 /**
  91  * qstring_destroy_obj(): Free all memory allocated by a QString
  92  * object
  93  */
  94 void qstring_destroy_obj(QObject *obj)
  95 {
  96     QString *qs;
  97
  98     assert(obj != NULL);
  99     qs = qobject_to(QString, obj);
 100     g_free((char *)qs->string);
 101     g_free(qs);
 102 }