From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47658) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eBe0A-0003tB-J4 for qemu-devel@nongnu.org; Mon, 06 Nov 2017 04:47:31 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eBe05-0003gT-KG for qemu-devel@nongnu.org; Mon, 06 Nov 2017 04:47:30 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60752) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eBe05-0003gF-EB for qemu-devel@nongnu.org; Mon, 06 Nov 2017 04:47:25 -0500 From: Peter Xu Date: Mon, 6 Nov 2017 17:46:18 +0800 Message-Id: <20171106094643.14881-3-peterx@redhat.com> In-Reply-To: <20171106094643.14881-1-peterx@redhat.com> References: <20171106094643.14881-1-peterx@redhat.com> Subject: [Qemu-devel] [RFC v3 02/27] qobject: introduce qstring_get_try_str() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , "Daniel P . Berrange" , Paolo Bonzini , Fam Zheng , Jiri Denemark , Juan Quintela , mdroth@linux.vnet.ibm.com, peterx@redhat.com, Eric Blake , Laurent Vivier , marcandre.lureau@redhat.com, Markus Armbruster , "Dr . David Alan Gilbert" The only difference from qstring_get_str() is that it allows the qstring to be NULL. If so, NULL is returned. CC: Eric Blake CC: Markus Armbruster Signed-off-by: Peter Xu --- include/qapi/qmp/qstring.h | 1 + qobject/qstring.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/include/qapi/qmp/qstring.h b/include/qapi/qmp/qstring.h index 10076b7c8c..34278bd639 100644 --- a/include/qapi/qmp/qstring.h +++ b/include/qapi/qmp/qstring.h @@ -27,6 +27,7 @@ QString *qstring_from_str(const char *str); QString *qstring_from_substr(const char *str, int start, int end); size_t qstring_get_length(const QString *qstring); const char *qstring_get_str(const QString *qstring); +const char *qstring_get_try_str(const QString *qstring); void qstring_append_int(QString *qstring, int64_t value); void qstring_append(QString *qstring, const char *str); void qstring_append_chr(QString *qstring, int c); diff --git a/qobject/qstring.c b/qobject/qstring.c index 5da7b5f37c..9df04e3c7b 100644 --- a/qobject/qstring.c +++ b/qobject/qstring.c @@ -129,6 +129,16 @@ const char *qstring_get_str(const QString *qstring) } /** + * qstring_get_try_str(): Return a pointer to the stored string + * + * NOTE: will return NULL if qstring is not provided. + */ +const char *qstring_get_try_str(const QString *qstring) +{ + return qstring ? qstring_get_str(qstring) : NULL; +} + +/** * qstring_destroy_obj(): Free all memory allocated by a QString * object */ -- 2.13.5