util: add return value to qemu_iovec_concat_iov

This will be necessary later to recognize the case where a
request has both dataout and datain.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/util/iov.c b/util/iov.c
index 49f88388f8..2b4f46da75 100644
--- a/util/iov.c
+++ b/util/iov.c
@@ -295,15 +295,15 @@ void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
  * of src".
  * Only vector pointers are processed, not the actual data buffers.
  */
-void qemu_iovec_concat_iov(QEMUIOVector *dst,
-                           struct iovec *src_iov, unsigned int src_cnt,
-                           size_t soffset, size_t sbytes)
+size_t qemu_iovec_concat_iov(QEMUIOVector *dst,
+                             struct iovec *src_iov, unsigned int src_cnt,
+                             size_t soffset, size_t sbytes)
 {
     int i;
     size_t done;
 
     if (!sbytes) {
-        return;
+        return 0;
     }
     assert(dst->nalloc != -1);
     for (i = 0, done = 0; done < sbytes && i < src_cnt; i++) {
@@ -317,6 +317,8 @@ void qemu_iovec_concat_iov(QEMUIOVector *dst,
         }
     }
     assert(soffset == 0); /* offset beyond end of src */
+
+    return done;
 }
 
 /*