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 |
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 | |