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