blobmsg: add blobmsg_realloc_string_buffer()

[project/libubox.git] / blob.c

diff --git a/blob.c b/blob.c
index 928b5c5..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;
@@ -243,3 +249,17 @@ blob_attr_equal(const struct blob_attr *a1, const struct blob_attr *a2)
 
        return !memcmp(a1, a2, blob_pad_len(a1));
 }
+
+struct blob_attr *
+blob_memdup(struct blob_attr *attr)
+{
+       struct blob_attr *ret;
+       int size = blob_pad_len(attr);
+
+       ret = malloc(size);
+       if (!ret)
+               return NULL;
+
+       memcpy(ret, attr, size);
+       return ret;
+}