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qstring: Make conversion from QObject * accept null

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qobject_to_qstring() crashes on null, which is a trap for the unwary.
Return null instead, and simplify a few callers.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1444918537-18107-7-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Markus Armbruster 2015-10-15 16:15:37 +02:00
parent 2d6421a900
commit 7f0278435d
3 changed files with 8 additions and 13 deletions
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4
qobject/qstring.c
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@ -117,9 +117,9 @@ void qstring_append_chr(QString *qstring, int c)
*/
QString *qobject_to_qstring(const QObject *obj)
{
if (qobject_type(obj) != QTYPE_QSTRING)
if (!obj || qobject_type(obj) != QTYPE_QSTRING) {
return NULL;
}
return container_of(obj, QString, base);
}