iov: Add iov_to_buf and iov_size helpers
iov_to_buf() puts the buffer contents in the iov in a linearized buffer.
iov_size() gets the length of the contents in the iov.
The iov_to_buf() function is the memcpy_to_iovec() function that was
used in virtio-ballon.c.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/iov.c b/hw/iov.c
index 07bd499..588cd04 100644
--- a/hw/iov.c
+++ b/hw/iov.c
@@ -31,3 +31,40 @@
}
return offset;
}
+
+size_t iov_to_buf(const struct iovec *iov, const unsigned int iovcnt,
+ void *buf, size_t offset, size_t size)
+{
+ uint8_t *ptr;
+ size_t iov_off, buf_off;
+ unsigned int i;
+
+ ptr = buf;
+ iov_off = 0;
+ buf_off = 0;
+ for (i = 0; i < iovcnt && size; i++) {
+ if (offset < (iov_off + iov[i].iov_len)) {
+ size_t len = MIN((iov_off + iov[i].iov_len) - offset , size);
+
+ memcpy(ptr + buf_off, iov[i].iov_base + (offset - iov_off), len);
+
+ buf_off += len;
+ offset += len;
+ size -= len;
+ }
+ iov_off += iov[i].iov_len;
+ }
+ return buf_off;
+}
+
+size_t iov_size(const struct iovec *iov, const unsigned int iovcnt)
+{
+ size_t len;
+ unsigned int i;
+
+ len = 0;
+ for (i = 0; i < iovcnt; i++) {
+ len += iov[i].iov_len;
+ }
+ return len;
+}