blob: add blob_buf_grow()

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

diff --git a/blob.c b/blob.c
index e74f07f..c18f5a9 100644 (file)
--- 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;

diff --git a/blob.h b/blob.h
index 557899d..d78115f 100644 (file)
--- a/blob.h
+++ b/blob.h
@@ -238,6 +238,7 @@ extern void blob_set_raw_len(struct blob_attr *attr, unsigned int len);
 extern bool blob_attr_equal(const struct blob_attr *a1, const struct blob_attr *a2);
 extern int blob_buf_init(struct blob_buf *buf, int id);
 extern void blob_buf_free(struct blob_buf *buf);
+extern void blob_buf_grow(struct blob_buf *buf, int required);
 extern struct blob_attr *blob_new(struct blob_buf *buf, int id, int payload);
 extern void *blob_nest_start(struct blob_buf *buf, int id);
 extern void blob_nest_end(struct blob_buf *buf, void *cookie);