2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2016 Jakub Klama <jceel@FreeBSD.org>.
5 * Copyright (c) 2018 Alexander Motin <mav@FreeBSD.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer
13 * in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/types.h>
43 seek_iov(const struct iovec *iov1, int niov1, struct iovec *iov2, int *niov2,
50 for (i = 0; i < niov1; i++) {
51 size_t toseek = MIN(left, iov1[i].iov_len);
54 if (toseek == iov1[i].iov_len)
63 for (j = i; j < niov1; j++) {
64 iov2[j - i].iov_base = (char *)iov1[j].iov_base + remainder;
65 iov2[j - i].iov_len = iov1[j].iov_len - remainder;
73 count_iov(const struct iovec *iov, int niov)
78 for (i = 0; i < niov; i++)
79 total += iov[i].iov_len;
85 truncate_iov(struct iovec *iov, int *niov, size_t length)
90 for (i = 0; i < *niov; i++) {
91 size_t toseek = MIN(length - done, iov[i].iov_len);
94 if (toseek <= iov[i].iov_len) {
95 iov[i].iov_len = toseek;
103 iov_to_buf(const struct iovec *iov, int niov, void **buf)
108 total = count_iov(iov, niov);
109 *buf = realloc(*buf, total);
113 for (i = 0, ptr = 0; i < niov; i++) {
114 memcpy(*buf + ptr, iov[i].iov_base, iov[i].iov_len);
115 ptr += iov[i].iov_len;
122 buf_to_iov(const void *buf, size_t buflen, const struct iovec *iov, int niov,
132 diov = malloc(sizeof(struct iovec) * niov);
133 seek_iov(iov, niov, diov, &ndiov, seek);
138 for (i = 0; i < niov && off < buflen; i++) {
139 len = MIN(iov[i].iov_len, buflen - off);
140 memcpy(iov[i].iov_base, buf + off, len);
147 return ((ssize_t)off);