nvme_util.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2013 Intel Corporation
5 * Copyright (C) 1997 Justin T. Gibbs
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: stable/11/sys/dev/nvme/nvme_util.c 330897 2018-03-14 03:19:51Z eadler $");
32
33#include <sys/param.h>
34#include <dev/nvme/nvme.h>
35
36void
37nvme_strvis(uint8_t *dst, const uint8_t *src, int dstlen, int srclen)
38{
39	uint8_t *cur_pos;
40
41	/* Trim leading/trailing spaces, nulls. */
42	while (srclen > 0 && src[0] == ' ')
43		src++, srclen--;
44	while (srclen > 0
45	    && (src[srclen - 1] == ' ' || src[srclen - 1] == '\0'))
46		srclen--;
47
48	while (srclen > 0 && dstlen > 1) {
49		cur_pos = dst;
50
51		/* Show '?' for non-printable characters. */
52		if (*src < 0x20 || *src >= 0x7F)
53			*cur_pos++ = '?';
54		else
55			*cur_pos++ = *src;
56		src++;
57		srclen--;
58		dstlen -= cur_pos - dst;
59		dst = cur_pos;
60	}
61	*dst = '\0';
62}
63
64