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[RFC,v4,01/27] qobject: introduce qstring_get_try_str()

Message ID 20171116130610.23582-2-peterx@redhat.com
State New
Headers show
Series QMP: out-of-band (OOB) execution support | expand

Commit Message

Peter Xu Nov. 16, 2017, 1:05 p.m. UTC 
The only difference from qstring_get_str() is that it allows the qstring
to be NULL.  If so, NULL is returned.

CC: Eric Blake <eblake@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/qapi/qmp/qstring.h |  1 +
 qobject/qstring.c          | 10 ++++++++++
 2 files changed, 11 insertions(+)
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Patch

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
  */