| 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 | |