blobmsg: allow data/length iterator/accessor functions to work on non-blobmsg elements

This primarily helps with simplifying the ubus APIs.
blobmsg header presence is indicated by the BLOB_ATTR_EXTENDED bit in
the id_len field.

This changes the format ABI, but not the API.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/blobmsg.c b/blobmsg.c
index 3076620..47ee9e7 100644
--- a/blobmsg.c
+++ b/blobmsg.c
@@ -181,6 +181,7 @@ blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, v
 	if (!attr)
 		return NULL;
 
+	attr->id_len |= be32_to_cpu(BLOB_ATTR_EXTENDED);
 	hdr = blob_data(attr);
 	hdr->namelen = cpu_to_be16(namelen);
 	strcpy((char *) hdr->name, (const char *)name);