1 /* $NetBSD: vis.c,v 1.8 1997/07/21 14:07:47 jtc Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 7/19/93"; 40 #else 41 __RCSID("$NetBSD: vis.c,v 1.8 1997/07/21 14:07:47 jtc Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 #include <limits.h> 48 #include <ctype.h> 49 #include <vis.h> 50 51 #ifdef __weak_alias 52 __weak_alias(strvis,_strvis); 53 __weak_alias(strvisx,_strvisx); 54 __weak_alias(vis,_vis); 55 #endif 56 57 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 58 59 /* 60 * vis - visually encode characters 61 */ 62 char * 63 vis(dst, c, flag, nextc) 64 register char *dst; 65 int c, nextc; 66 register int flag; 67 { 68 if (((u_int)c <= UCHAR_MAX && isascii(c) && isgraph(c)) || 69 ((flag & VIS_SP) == 0 && c == ' ') || 70 ((flag & VIS_TAB) == 0 && c == '\t') || 71 ((flag & VIS_NL) == 0 && c == '\n') || 72 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) { 73 *dst++ = c; 74 if (c == '\\' && (flag & VIS_NOSLASH) == 0) 75 *dst++ = '\\'; 76 *dst = '\0'; 77 return (dst); 78 } 79 80 if (flag & VIS_CSTYLE) { 81 switch(c) { 82 case '\n': 83 *dst++ = '\\'; 84 *dst++ = 'n'; 85 goto done; 86 case '\r': 87 *dst++ = '\\'; 88 *dst++ = 'r'; 89 goto done; 90 case '\b': 91 *dst++ = '\\'; 92 *dst++ = 'b'; 93 goto done; 94 #if __STDC__ 95 case '\a': 96 #else 97 case '\007': 98 #endif 99 *dst++ = '\\'; 100 *dst++ = 'a'; 101 goto done; 102 case '\v': 103 *dst++ = '\\'; 104 *dst++ = 'v'; 105 goto done; 106 case '\t': 107 *dst++ = '\\'; 108 *dst++ = 't'; 109 goto done; 110 case '\f': 111 *dst++ = '\\'; 112 *dst++ = 'f'; 113 goto done; 114 case ' ': 115 *dst++ = '\\'; 116 *dst++ = 's'; 117 goto done; 118 case '\0': 119 *dst++ = '\\'; 120 *dst++ = '0'; 121 if (isoctal(nextc)) { 122 *dst++ = '0'; 123 *dst++ = '0'; 124 } 125 goto done; 126 } 127 } 128 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) { 129 *dst++ = '\\'; 130 *dst++ = ((u_char)c >> 6 & 07) + '0'; 131 *dst++ = ((u_char)c >> 3 & 07) + '0'; 132 *dst++ = ((u_char)c & 07) + '0'; 133 goto done; 134 } 135 if ((flag & VIS_NOSLASH) == 0) 136 *dst++ = '\\'; 137 if (c & 0200) { 138 c &= 0177; 139 *dst++ = 'M'; 140 } 141 if (iscntrl(c)) { 142 *dst++ = '^'; 143 if (c == 0177) 144 *dst++ = '?'; 145 else 146 *dst++ = c + '@'; 147 } else { 148 *dst++ = '-'; 149 *dst++ = c; 150 } 151 done: 152 *dst = '\0'; 153 return (dst); 154 } 155 156 /* 157 * strvis, strvisx - visually encode characters from src into dst 158 * 159 * Dst must be 4 times the size of src to account for possible 160 * expansion. The length of dst, not including the trailing NULL, 161 * is returned. 162 * 163 * Strvisx encodes exactly len bytes from src into dst. 164 * This is useful for encoding a block of data. 165 */ 166 int 167 strvis(dst, src, flag) 168 register char *dst; 169 register const char *src; 170 int flag; 171 { 172 register char c; 173 char *start; 174 175 for (start = dst; (c = *src) != '\0';) 176 dst = vis(dst, c, flag, *++src); 177 *dst = '\0'; 178 return (dst - start); 179 } 180 181 int 182 strvisx(dst, src, len, flag) 183 register char *dst; 184 register const char *src; 185 register size_t len; 186 int flag; 187 { 188 register char c; 189 char *start; 190 191 for (start = dst; len > 1; len--) { 192 c = *src; 193 dst = vis(dst, c, flag, *++src); 194 } 195 if (len) 196 dst = vis(dst, *src, flag, '\0'); 197 *dst = '\0'; 198 199 return (dst - start); 200 } 201