1 /* $NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft 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 #if 1 37 #ifdef HAVE_CONFIG_H 38 #include <config.h> 39 RCSID("$Id: unvis.c,v 1.2 2000/12/06 21:41:46 joda Exp $"); 40 #endif 41 #include <roken.h> 42 #ifndef _DIAGASSERT 43 #define _DIAGASSERT(X) 44 #endif 45 #else 46 #include <sys/cdefs.h> 47 #if defined(LIBC_SCCS) && !defined(lint) 48 #if 0 49 static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93"; 50 #else 51 __RCSID("$NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $"); 52 #endif 53 #endif /* LIBC_SCCS and not lint */ 54 55 #define __LIBC12_SOURCE__ 56 57 #include "namespace.h" 58 #endif 59 #include <sys/types.h> 60 61 #include <assert.h> 62 #include <ctype.h> 63 #include <stdio.h> 64 #include <vis.h> 65 66 #if 0 67 #ifdef __weak_alias 68 __weak_alias(strunvis,_strunvis) 69 __weak_alias(unvis,_unvis) 70 #endif 71 72 __warn_references(unvis, 73 "warning: reference to compatibility unvis(); include <vis.h> for correct reference") 74 #endif 75 76 /* 77 * decode driven by state machine 78 */ 79 #define S_GROUND 0 /* haven't seen escape char */ 80 #define S_START 1 /* start decoding special sequence */ 81 #define S_META 2 /* metachar started (M) */ 82 #define S_META1 3 /* metachar more, regular char (-) */ 83 #define S_CTRL 4 /* control char started (^) */ 84 #define S_OCTAL2 5 /* octal digit 2 */ 85 #define S_OCTAL3 6 /* octal digit 3 */ 86 87 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 88 89 /* 90 * unvis - decode characters previously encoded by vis 91 */ 92 #ifndef HAVE_UNVIS 93 int 94 unvis(char *cp, int c, int *astate, int flag) 95 { 96 97 _DIAGASSERT(cp != NULL); 98 _DIAGASSERT(astate != NULL); 99 100 if (flag & UNVIS_END) { 101 if (*astate == S_OCTAL2 || *astate == S_OCTAL3) { 102 *astate = S_GROUND; 103 return (UNVIS_VALID); 104 } 105 return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD); 106 } 107 108 switch (*astate) { 109 110 case S_GROUND: 111 *cp = 0; 112 if (c == '\\') { 113 *astate = S_START; 114 return (0); 115 } 116 *cp = c; 117 return (UNVIS_VALID); 118 119 case S_START: 120 switch(c) { 121 case '\\': 122 *cp = c; 123 *astate = S_GROUND; 124 return (UNVIS_VALID); 125 case '0': case '1': case '2': case '3': 126 case '4': case '5': case '6': case '7': 127 *cp = (c - '0'); 128 *astate = S_OCTAL2; 129 return (0); 130 case 'M': 131 *cp = (char)0200; 132 *astate = S_META; 133 return (0); 134 case '^': 135 *astate = S_CTRL; 136 return (0); 137 case 'n': 138 *cp = '\n'; 139 *astate = S_GROUND; 140 return (UNVIS_VALID); 141 case 'r': 142 *cp = '\r'; 143 *astate = S_GROUND; 144 return (UNVIS_VALID); 145 case 'b': 146 *cp = '\b'; 147 *astate = S_GROUND; 148 return (UNVIS_VALID); 149 case 'a': 150 *cp = '\007'; 151 *astate = S_GROUND; 152 return (UNVIS_VALID); 153 case 'v': 154 *cp = '\v'; 155 *astate = S_GROUND; 156 return (UNVIS_VALID); 157 case 't': 158 *cp = '\t'; 159 *astate = S_GROUND; 160 return (UNVIS_VALID); 161 case 'f': 162 *cp = '\f'; 163 *astate = S_GROUND; 164 return (UNVIS_VALID); 165 case 's': 166 *cp = ' '; 167 *astate = S_GROUND; 168 return (UNVIS_VALID); 169 case 'E': 170 *cp = '\033'; 171 *astate = S_GROUND; 172 return (UNVIS_VALID); 173 case '\n': 174 /* 175 * hidden newline 176 */ 177 *astate = S_GROUND; 178 return (UNVIS_NOCHAR); 179 case '$': 180 /* 181 * hidden marker 182 */ 183 *astate = S_GROUND; 184 return (UNVIS_NOCHAR); 185 } 186 *astate = S_GROUND; 187 return (UNVIS_SYNBAD); 188 189 case S_META: 190 if (c == '-') 191 *astate = S_META1; 192 else if (c == '^') 193 *astate = S_CTRL; 194 else { 195 *astate = S_GROUND; 196 return (UNVIS_SYNBAD); 197 } 198 return (0); 199 200 case S_META1: 201 *astate = S_GROUND; 202 *cp |= c; 203 return (UNVIS_VALID); 204 205 case S_CTRL: 206 if (c == '?') 207 *cp |= 0177; 208 else 209 *cp |= c & 037; 210 *astate = S_GROUND; 211 return (UNVIS_VALID); 212 213 case S_OCTAL2: /* second possible octal digit */ 214 if (isoctal(c)) { 215 /* 216 * yes - and maybe a third 217 */ 218 *cp = (*cp << 3) + (c - '0'); 219 *astate = S_OCTAL3; 220 return (0); 221 } 222 /* 223 * no - done with current sequence, push back passed char 224 */ 225 *astate = S_GROUND; 226 return (UNVIS_VALIDPUSH); 227 228 case S_OCTAL3: /* third possible octal digit */ 229 *astate = S_GROUND; 230 if (isoctal(c)) { 231 *cp = (*cp << 3) + (c - '0'); 232 return (UNVIS_VALID); 233 } 234 /* 235 * we were done, push back passed char 236 */ 237 return (UNVIS_VALIDPUSH); 238 239 default: 240 /* 241 * decoder in unknown state - (probably uninitialized) 242 */ 243 *astate = S_GROUND; 244 return (UNVIS_SYNBAD); 245 } 246 } 247 #endif 248 249 /* 250 * strunvis - decode src into dst 251 * 252 * Number of chars decoded into dst is returned, -1 on error. 253 * Dst is null terminated. 254 */ 255 256 #ifndef HAVE_STRUNVIS 257 int 258 strunvis(char *dst, const char *src) 259 { 260 char c; 261 char *start = dst; 262 int state = 0; 263 264 _DIAGASSERT(src != NULL); 265 _DIAGASSERT(dst != NULL); 266 267 while ((c = *src++) != '\0') { 268 again: 269 switch (unvis(dst, c, &state, 0)) { 270 case UNVIS_VALID: 271 dst++; 272 break; 273 case UNVIS_VALIDPUSH: 274 dst++; 275 goto again; 276 case 0: 277 case UNVIS_NOCHAR: 278 break; 279 default: 280 return (-1); 281 } 282 } 283 if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID) 284 dst++; 285 *dst = '\0'; 286 return (dst - start); 287 } 288 #endif 289