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68396ea @rmustacc Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm
rmustacc authored
1 /*
2 * Helpers for getting linearized buffers from iov / filling buffers into iovs
3 *
4 * Copyright IBM, Corp. 2007, 2008
5 * Copyright (C) 2010 Red Hat, Inc.
6 *
7 * Author(s):
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Amit Shah <amit.shah@redhat.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2. See
12 * the COPYING file in the top-level directory.
13 */
14
15 #include "iov.h"
16
17 size_t iov_from_buf(struct iovec *iov, unsigned int iovcnt,
18 const void *buf, size_t size)
19 {
20 size_t offset;
21 unsigned int i;
22
23 offset = 0;
24 for (i = 0; offset < size && i < iovcnt; i++) {
25 size_t len;
26
27 len = MIN(iov[i].iov_len, size - offset);
28
29 memcpy(iov[i].iov_base, buf + offset, len);
30 offset += len;
31 }
32 return offset;
33 }
34
35 size_t iov_to_buf(const struct iovec *iov, const unsigned int iovcnt,
36 void *buf, size_t offset, size_t size)
37 {
38 uint8_t *ptr;
39 size_t iov_off, buf_off;
40 unsigned int i;
41
42 ptr = buf;
43 iov_off = 0;
44 buf_off = 0;
45 for (i = 0; i < iovcnt && size; i++) {
46 if (offset < (iov_off + iov[i].iov_len)) {
47 size_t len = MIN((iov_off + iov[i].iov_len) - offset , size);
48
49 memcpy(ptr + buf_off, iov[i].iov_base + (offset - iov_off), len);
50
51 buf_off += len;
52 offset += len;
53 size -= len;
54 }
55 iov_off += iov[i].iov_len;
56 }
57 return buf_off;
58 }
59
60 size_t iov_size(const struct iovec *iov, const unsigned int iovcnt)
61 {
62 size_t len;
63 unsigned int i;
64
65 len = 0;
66 for (i = 0; i < iovcnt; i++) {
67 len += iov[i].iov_len;
68 }
69 return len;
70 }
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