1 /* $NetBSD: strnvisx.c,v 1.1 2016/05/02 19:18:29 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1998, 1999, 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum; by Jason R. Thorpe of the Numerical Aerospace
9 * Simulation Facility, NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * from scsipiconf.c...
35 */
36 #include <lib/libkern/libkern.h>
37
38 #define STRVIS_ISWHITE(x) ((x) == ' ' || (x) == '\0' || (x) == '\377')
39
40 int
strnvisx(char * dst,size_t dlen,const char * src,size_t slen,int flags)41 strnvisx(char *dst, size_t dlen, const char *src, size_t slen, int flags)
42 {
43 if (dlen == 0)
44 return -1;
45
46 if (flags & VIS_TRIM) {
47 /* Trim leading and trailing blanks and NULs. */
48 while (slen > 0 && STRVIS_ISWHITE(src[0]))
49 ++src, --slen;
50 while (slen > 0 && STRVIS_ISWHITE(src[slen - 1]))
51 --slen;
52 }
53
54 while (slen > 0) {
55 if ((flags & VIS_SAFE) && (*src < 0x20 || (*src & 0x80))) {
56 /* non-printable characters */
57 if (dlen < 4)
58 goto out;
59 dlen -= 4;
60 *dst++ = '\\';
61 *dst++ = ((*src & 0300) >> 6) + '0';
62 *dst++ = ((*src & 0070) >> 3) + '0';
63 *dst++ = ((*src & 0007) >> 0) + '0';
64 } else if (*src == '\\') {
65 /* quote characters */
66 if (dlen < 2)
67 goto out;
68 dlen -= 2;
69 *dst++ = '\\';
70 *dst++ = '\\';
71 } else {
72 /* normal characters */
73 if (dlen < 1)
74 goto out;
75 *dst++ = *src;
76 }
77 ++src, --slen;
78 }
79 out:
80 if (dlen > 0) {
81 *dst++ = '\0';
82 return slen ? -1 : 0;
83 } else {
84 *--dst = '\0';
85 return -1;
86 }
87 }
88