blob: add blob_buf_grow()

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

1 files changed, 12 insertions, 6 deletions

diff --git a/blob.c b/blob.c
index e74f07f..c18f5a9 100644
--- a/blob.c
+++ b/blob.c
@@ -50,6 +50,17 @@ attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
 	return (char *)attr - (char *) buf->buf;
 }
 
+void
+blob_buf_grow(struct blob_buf *buf, int required)
+{
+	int offset_head = attr_to_offset(buf, buf->head);
+
+	if (!buf->grow || !buf->grow(buf, required))
+		return;
+
+	buf->head = offset_to_attr(buf, offset_head);
+}
+
 static struct blob_attr *
 blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload)
 {
@@ -58,12 +69,7 @@ blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload)
 	struct blob_attr *attr;
 
 	if (required > 0) {
-		int offset_head = attr_to_offset(buf, buf->head);
-
-		if (!buf->grow || !buf->grow(buf, required))
-			return NULL;
-
-		buf->head = offset_to_attr(buf, offset_head);
+		blob_buf_grow(buf, required);
 		attr = offset_to_attr(buf, offset);
 	} else {
 		attr = pos;