[Qemu-devel] [PATCH 06/20] qobject: New qobject_from_vjsonf_nofail(), qdict_from_vjsonf_nofail()

[Markus Armbruster <armbru@redhat.com>]

Every printf()-like function sooner or later needs its vprintf()-like
buddy.  The next commit will need qobject_from_jsonf_nofail()'s buddy,
and qdict_from_jsonf_nofail()'s buddy will be used later in this
series.  Add both.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 include/qapi/qmp/qjson.h |  4 ++++
 qobject/qjson.c          | 44 +++++++++++++++++++++++++++++++++-------
 2 files changed, 41 insertions(+), 7 deletions(-)

diff --git a/include/qapi/qmp/qjson.h b/include/qapi/qmp/qjson.h
index dc509d51ae..0db121bef9 100644
--- a/include/qapi/qmp/qjson.h
+++ b/include/qapi/qmp/qjson.h
@@ -18,8 +18,12 @@ QObject *qobject_from_json(const char *string, Error **errp);
 QObject *qobject_from_jsonv(const char *string, va_list *ap, Error **errp)
     GCC_FMT_ATTR(1, 0);
 
+QObject *qobject_from_vjsonf_nofail(const char *string, va_list)
+    GCC_FMT_ATTR(1, 0);
 QObject *qobject_from_jsonf_nofail(const char *string, ...)
     GCC_FMT_ATTR(1, 2);
+QDict *qdict_from_vjsonf_nofail(const char *string, va_list ap)
+    GCC_FMT_ATTR(1, 0);
 QDict *qdict_from_jsonf_nofail(const char *string, ...)
     GCC_FMT_ATTR(1, 2);
 
diff --git a/qobject/qjson.c b/qobject/qjson.c
index 4a9dcff343..2e450231ff 100644
--- a/qobject/qjson.c
+++ b/qobject/qjson.c
@@ -59,6 +59,25 @@ QObject *qobject_from_json(const char *string, Error **errp)
     return qobject_from_jsonv(string, NULL, errp);
 }
 
+/*
+ * Parse @string as JSON value with %-escapes interpolated.
+ * Abort on error.  Do not use with untrusted @string.
+ * Return the resulting QObject.  It is never null.
+ */
+QObject *qobject_from_vjsonf_nofail(const char *string, va_list ap)
+{
+    va_list ap_copy;
+    QObject *obj;
+
+    /* va_copy() is needed when va_list is an array type */
+    va_copy(ap_copy, ap);
+    obj = qobject_from_jsonv(string, &ap_copy, &error_abort);
+    va_end(ap_copy);
+
+    assert(obj);
+    return obj;
+}
+
 /*
  * Parse @string as JSON value with %-escapes interpolated.
  * Abort on error.  Do not use with untrusted @string.
@@ -70,13 +89,26 @@ QObject *qobject_from_jsonf_nofail(const char *string, ...)
     va_list ap;
 
     va_start(ap, string);
-    obj = qobject_from_jsonv(string, &ap, &error_abort);
+    obj = qobject_from_vjsonf_nofail(string, ap);
     va_end(ap);
 
-    assert(obj);
     return obj;
 }
 
+/*
+ * Parse @string as JSON object with %-escapes interpolated.
+ * Abort on error.  Do not use with untrusted @string.
+ * Return the resulting QDict.  It is never null.
+ */
+QDict *qdict_from_vjsonf_nofail(const char *string, va_list ap)
+{
+    QDict *qdict;
+
+    qdict = qobject_to(QDict, qobject_from_vjsonf_nofail(string, ap));
+    assert(qdict);
+    return qdict;
+}
+
 /*
  * Parse @string as JSON object with %-escapes interpolated.
  * Abort on error.  Do not use with untrusted @string.
@@ -84,15 +116,13 @@ QObject *qobject_from_jsonf_nofail(const char *string, ...)
  */
 QDict *qdict_from_jsonf_nofail(const char *string, ...)
 {
-    QDict *obj;
+    QDict *qdict;
     va_list ap;
 
     va_start(ap, string);
-    obj = qobject_to(QDict, qobject_from_jsonv(string, &ap, &error_abort));
+    qdict = qdict_from_vjsonf_nofail(string, ap);
     va_end(ap);
-
-    assert(obj);
-    return obj;
+    return qdict;
 }
 
 typedef struct ToJsonIterState
-- 
2.17.1