diff options
Diffstat (limited to 'hw/iov.c')
-rw-r--r-- | hw/iov.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/hw/iov.c b/hw/iov.c new file mode 100644 index 0000000000..07bd499b0d --- /dev/null +++ b/hw/iov.c @@ -0,0 +1,33 @@ +/* + * Helpers for getting linearized buffers from iov / filling buffers into iovs + * + * Copyright IBM, Corp. 2007, 2008 + * Copyright (C) 2010 Red Hat, Inc. + * + * Author(s): + * Anthony Liguori <aliguori@us.ibm.com> + * Amit Shah <amit.shah@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include "iov.h" + +size_t iov_from_buf(struct iovec *iov, unsigned int iovcnt, + const void *buf, size_t size) +{ + size_t offset; + unsigned int i; + + offset = 0; + for (i = 0; offset < size && i < iovcnt; i++) { + size_t len; + + len = MIN(iov[i].iov_len, size - offset); + + memcpy(iov[i].iov_base, buf + offset, len); + offset += len; + } + return offset; +} |