api: enforce vla is last and fixed string type
Enforce that variable length fields are the last element of API messages.
Add a 'fixed' version of string type, since dealing with
multiple variable length strings turned out too painful
for the C language bindings.
The string type is now:
{
string name[64]; // NUL terminated C-string. Essentially decays to u8 name[64]
string name[]; // Variable length string with embedded len field (vl_api_string_t)
};
The latter notation could be made available to other types as well.
e.g.
{
vl_api_address_t addresses[];
}
instead of
{
u32 n_addr;
vl_api_address_t addresses[n_addr];
};
Type: fix
Change-Id: I18fa17ef47227633752ab50453e8d20a652a9f9b
Signed-off-by: Ole Troan <ot@cisco.com>
diff --git a/src/vpp-api/vapi/vapi_json_parser.py b/src/vpp-api/vapi/vapi_json_parser.py
index a9d2c81..d766936 100644
--- a/src/vpp-api/vapi/vapi_json_parser.py
+++ b/src/vpp-api/vapi/vapi_json_parser.py
@@ -177,12 +177,15 @@
p = field_class(field_name=field[1],
field_type=field_type)
elif l == 3:
- if field[2] == 0:
+ if field[2] == 0 and field[0] != 'string':
raise ParseError(
"While parsing message `%s': variable length "
"array `%s' doesn't have reference to member "
"containing the actual length" % (
name, field[1]))
+ if field[0] == 'string' and field[2] > 0:
+ field_type = json_parser.lookup_type_like_id('u8')
+
p = field_class(
field_name=field[1],
field_type=field_type,