blobmsg: add support for double

This adds support for double floating point type to make it more JSON
compatible. For type checking it also adds a stub BLOB_ATTR_DOUBLE type.
If necessary, the accessor functions for blob can be added later

Signed-off-by: André Gaul <andre@gaul.io>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 23 insertions, 0 deletions

diff --git a/blobmsg.h b/blobmsg.h
index 861a4e8..7977298 100644
--- a/blobmsg.h
+++ b/blobmsg.h
@@ -31,6 +31,7 @@ enum blobmsg_type {
 	BLOBMSG_TYPE_INT32,
 	BLOBMSG_TYPE_INT16,
 	BLOBMSG_TYPE_INT8,
+	BLOBMSG_TYPE_DOUBLE,
 	__BLOBMSG_TYPE_LAST,
 	BLOBMSG_TYPE_LAST = __BLOBMSG_TYPE_LAST - 1,
 	BLOBMSG_TYPE_BOOL = BLOBMSG_TYPE_INT8,
@@ -114,6 +115,18 @@ int blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
                       const void *data, unsigned int len);
 
 static inline int
+blobmsg_add_double(struct blob_buf *buf, const char *name, double val)
+{
+	union {
+		double d;
+		uint64_t u64;
+	} v;
+	v.d = val;
+	v.u64 = cpu_to_be64(v.u64);
+	return blobmsg_add_field(buf, BLOBMSG_TYPE_DOUBLE, name, &v.u64, 8);
+}
+
+static inline int
 blobmsg_add_u8(struct blob_buf *buf, const char *name, uint8_t val)
 {
 	return blobmsg_add_field(buf, BLOBMSG_TYPE_INT8, name, &val, 1);
@@ -212,6 +225,16 @@ static inline uint64_t blobmsg_get_u64(struct blob_attr *attr)
 	return tmp;
 }
 
+static inline double blobmsg_get_double(struct blob_attr *attr)
+{
+	union {
+		double d;
+		uint64_t u64;
+	} v;
+	v.u64 = blobmsg_get_u64(attr);
+	return v.d;
+}
+
 static inline char *blobmsg_get_string(struct blob_attr *attr)
 {
 	if (!attr)