1 /* $NetBSD: unvis.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */ 2 3 /* NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp */ 4 5 /*- 6 * Copyright (c) 1989, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 1 35 #include <config.h> 36 #include <krb5/roken.h> 37 #ifndef _DIAGASSERT 38 #define _DIAGASSERT(X) 39 #endif 40 #else 41 #include <sys/cdefs.h> 42 #if defined(LIBC_SCCS) && !defined(lint) 43 #if 0 44 static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93"; 45 #else 46 __RCSID("NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp"); 47 #endif 48 #endif /* LIBC_SCCS and not lint */ 49 50 #define __LIBC12_SOURCE__ 51 52 #include "namespace.h" 53 #endif 54 #include <sys/types.h> 55 56 #include <assert.h> 57 #include <ctype.h> 58 #include <stdio.h> 59 #include <vis.h> 60 61 #if 0 62 #ifdef __weak_alias 63 __weak_alias(strunvis,_strunvis) 64 __weak_alias(unvis,_unvis) 65 #endif 66 67 __warn_references(unvis, 68 "warning: reference to compatibility unvis(); include <vis.h> for correct reference") 69 #endif 70 71 /* 72 * decode driven by state machine 73 */ 74 #define S_GROUND 0 /* haven't seen escape char */ 75 #define S_START 1 /* start decoding special sequence */ 76 #define S_META 2 /* metachar started (M) */ 77 #define S_META1 3 /* metachar more, regular char (-) */ 78 #define S_CTRL 4 /* control char started (^) */ 79 #define S_OCTAL2 5 /* octal digit 2 */ 80 #define S_OCTAL3 6 /* octal digit 3 */ 81 82 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 83 84 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 85 rk_strunvis (char *, const char *); 86 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 87 rk_unvis (char *, int, int *, int); 88 89 /* 90 * unvis - decode characters previously encoded by vis 91 */ 92 93 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 94 rk_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 = (u_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 } 247 248 /* 249 * strunvis - decode src into dst 250 * 251 * Number of chars decoded into dst is returned, -1 on error. 252 * Dst is null terminated. 253 */ 254 255 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 256 rk_strunvis(char *dst, const char *src) 257 { 258 char c; 259 char *start = dst; 260 int state = 0; 261 262 _DIAGASSERT(src != NULL); 263 _DIAGASSERT(dst != NULL); 264 265 while ((c = *src++) != '\0') { 266 again: 267 switch (rk_unvis(dst, (unsigned char)c, &state, 0)) { 268 case UNVIS_VALID: 269 dst++; 270 break; 271 case UNVIS_VALIDPUSH: 272 dst++; 273 goto again; 274 case 0: 275 case UNVIS_NOCHAR: 276 break; 277 default: 278 return (-1); 279 } 280 } 281 if (unvis(dst, (unsigned char)c, &state, UNVIS_END) == UNVIS_VALID) 282 dst++; 283 *dst = '\0'; 284 return (dst - start); 285 } 286
Indexes created Wed Mar 04 05:31:52 UTC 2026