[Qemu-devel] [PATCH v5 26/28] qapi: Drop inline nested type in query-version

[Eric Blake <eblake@redhat.com>]

A future patch will be using a 'name':{dictionary} entry in the
QAPI schema to specify a default value for an optional argument;
but existing use of inline nested structs conflicts with that goal.
This patch fixes one of only two commands relying on nested
types, by breaking the nesting into an explicit type; it means
that the type is now boxed instead of unboxed in C code, but the
QMP wire format is unaffected by this change.

Prefer the safer g_new0() while making the conversion.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 hmp.c            |  2 +-
 qapi/common.json | 26 +++++++++++++++++++-------
 qmp.c            |  9 +++++----
 3 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/hmp.c b/hmp.c
index f31ae27..c59b823 100644
--- a/hmp.c
+++ b/hmp.c
@@ -60,7 +60,7 @@ void hmp_info_version(Monitor *mon, const QDict *qdict)
     info = qmp_query_version(NULL);

     monitor_printf(mon, "%" PRId64 ".%" PRId64 ".%" PRId64 "%s\n",
-                   info->qemu.major, info->qemu.minor, info->qemu.micro,
+                   info->qemu->major, info->qemu->minor, info->qemu->micro,
                    info->package);

     qapi_free_VersionInfo(info);
diff --git a/qapi/common.json b/qapi/common.json
index 63ef3b4..ed3aa57 100644
--- a/qapi/common.json
+++ b/qapi/common.json
@@ -29,15 +29,28 @@
             'DeviceNotActive', 'DeviceNotFound', 'KVMMissingCap' ] }

 ##
+# @VersionTriple
+#
+# A three-part version number.
+#
+# @qemu.major:  The major version number.
+#
+# @qemu.minor:  The minor version number.
+#
+# @qemu.micro:  The micro version number.
+#
+# Since: 2.4
+##
+{ 'type': 'VersionTriple',
+  'data': {'major': 'int', 'minor': 'int', 'micro': 'int'} }
+
+
+##
 # @VersionInfo:
 #
 # A description of QEMU's version.
 #
-# @qemu.major:  The major version of QEMU
-#
-# @qemu.minor:  The minor version of QEMU
-#
-# @qemu.micro:  The micro version of QEMU.  By current convention, a micro
+# @qemu:        The version of QEMU.  By current convention, a micro
 #               version of 50 signifies a development branch.  A micro version
 #               greater than or equal to 90 signifies a release candidate for
 #               the next minor version.  A micro version of less than 50
@@ -51,8 +64,7 @@
 # Since: 0.14.0
 ##
 { 'type': 'VersionInfo',
-  'data': {'qemu': {'major': 'int', 'minor': 'int', 'micro': 'int'},
-           'package': 'str'} }
+  'data': {'qemu': 'VersionTriple', 'package': 'str'} }

 ##
 # @query-version:
diff --git a/qmp.c b/qmp.c
index c479e77..78a5c23 100644
--- a/qmp.c
+++ b/qmp.c
@@ -45,15 +45,16 @@ NameInfo *qmp_query_name(Error **errp)

 VersionInfo *qmp_query_version(Error **errp)
 {
-    VersionInfo *info = g_malloc0(sizeof(*info));
+    VersionInfo *info = g_new0(VersionInfo, 1);
     const char *version = QEMU_VERSION;
     char *tmp;

-    info->qemu.major = strtol(version, &tmp, 10);
+    info->qemu = g_new0(VersionTriple, 1);
+    info->qemu->major = strtol(version, &tmp, 10);
     tmp++;
-    info->qemu.minor = strtol(tmp, &tmp, 10);
+    info->qemu->minor = strtol(tmp, &tmp, 10);
     tmp++;
-    info->qemu.micro = strtol(tmp, &tmp, 10);
+    info->qemu->micro = strtol(tmp, &tmp, 10);
     info->package = g_strdup(QEMU_PKGVERSION);

     return info;
-- 
2.1.0