[Qemu-devel] [PATCH v2] qapi: add struct strList and visit_type_strList()

[Amos Kong <akong@redhat.com>]

Currently we can only use ['String'] to add string to a list,
it contains some additional JSON structure.
    "multicast": [
        {
            "str": "01:80:c2:00:00:21"
        },
        {
            "str": "00:00:00:00:00:00"
        }
    ]

This patch adds struct strList and visit function, we can use ['str'] in
schema file.

    "multicast": [
        "01:00:5e:00:00:01",
        "33:33:ff:12:34:57"
    ]

V2: remove ugly #ifndef, add forward declaration in qapi-types.h,
    and define the struct in include/qapi/visitor.h (Paolo)

Signed-off-by: Amos Kong <akong@redhat.com>
---
 include/qapi/visitor.h |    7 +++++++
 qapi/qapi-visit-core.c |   23 +++++++++++++++++++++++
 scripts/qapi-types.py  |    1 +
 scripts/qapi.py        |    4 ++--
 4 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
index 1fef18c..743ff92 100644
--- a/include/qapi/visitor.h
+++ b/include/qapi/visitor.h
@@ -22,6 +22,11 @@ typedef struct GenericList
     struct GenericList *next;
 } GenericList;
 
+typedef struct strList {
+    char *value;
+    struct strList *next;
+} strList;
+
 typedef struct Visitor Visitor;
 
 void visit_start_handle(Visitor *v, void **obj, const char *kind,
@@ -50,6 +55,8 @@ void visit_type_int64(Visitor *v, int64_t *obj, const char *name, Error **errp);
 void visit_type_size(Visitor *v, uint64_t *obj, const char *name, Error **errp);
 void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp);
 void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp);
+void visit_type_strList(Visitor *m, strList ** obj, const char *name,
+                        Error **errp);
 void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp);
 
 #endif
diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index 401ee6e..dc54cc8 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -257,6 +257,29 @@ void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp)
     }
 }
 
+void visit_type_strList(Visitor *m, strList ** obj, const char *name,
+                        Error **errp)
+{
+    GenericList *i, **prev = (GenericList **)obj;
+    Error *err = NULL;
+
+    if (!error_is_set(errp)) {
+        visit_start_list(m, name, &err);
+        if (!err) {
+            for (; (i = visit_next_list(m, prev, &err)) != NULL; prev = &i) {
+                strList *native_i = (strList *)i;
+                visit_type_str(m, &native_i->value, NULL, &err);
+            }
+            error_propagate(errp, err);
+            err = NULL;
+
+            /* Always call end_list if start_list succeeded.  */
+            visit_end_list(m, &err);
+        }
+        error_propagate(errp, err);
+    }
+}
+
 void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
 {
     if (!error_is_set(errp)) {
diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index 9e19920..e449a14 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -276,6 +276,7 @@ fdecl.write(mcgen('''
 #include <stdbool.h>
 #include <stdint.h>
 
+struct strList;
 ''',
                   guard=guardname(h_file)))
 
diff --git a/scripts/qapi.py b/scripts/qapi.py
index afc5f32..14f9f4d 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -166,11 +166,11 @@ def c_fun(name, protect=True):
     return c_var(name, protect).replace('.', '_')
 
 def c_list_type(name):
-    return '%sList' % name
+    return 'struct %sList' % name
 
 def type_name(name):
     if type(name) == list:
-        return c_list_type(name[0])
+        return '%sList' % name[0]
     return name
 
 enum_types = []
-- 
1.7.1