unvis.c revision 1.20
1 /* $NetBSD: unvis.c,v 1.20 2002/01/29 02:04:30 tv 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 HAVE_CONFIG_H 37 #include "config.h" 38 #else 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 __RCSID("$NetBSD: unvis.c,v 1.20 2002/01/29 02:04:30 tv Exp $"); 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 #define __LIBC12_SOURCE__ 49 50 #include "namespace.h" 51 #include <sys/types.h> 52 53 #include <assert.h> 54 #include <ctype.h> 55 #include <stdio.h> 56 #include <vis.h> 57 58 #ifdef __weak_alias 59 __weak_alias(strunvis,_strunvis) 60 __weak_alias(unvis,_unvis) 61 #endif 62 63 __warn_references(unvis, 64 "warning: reference to compatibility unvis(); include <vis.h> for correct reference") 65 #endif /* !HAVE_CONFIG_H */ 66 67 #if !HAVE_VIS_H 68 /* 69 * decode driven by state machine 70 */ 71 #define S_GROUND 0 /* haven't seen escape char */ 72 #define S_START 1 /* start decoding special sequence */ 73 #define S_META 2 /* metachar started (M) */ 74 #define S_META1 3 /* metachar more, regular char (-) */ 75 #define S_CTRL 4 /* control char started (^) */ 76 #define S_OCTAL2 5 /* octal digit 2 */ 77 #define S_OCTAL3 6 /* octal digit 3 */ 78 79 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 80 81 int 82 unvis(cp, c, astate, flag) 83 char *cp; 84 int c; 85 int *astate, flag; 86 { 87 return __unvis13(cp, (int)c, astate, flag); 88 } 89 90 /* 91 * unvis - decode characters previously encoded by vis 92 */ 93 int 94 __unvis13(cp, c, astate, flag) 95 char *cp; 96 int c; 97 int *astate, flag; 98 { 99 100 _DIAGASSERT(cp != NULL); 101 _DIAGASSERT(astate != NULL); 102 103 if (flag & UNVIS_END) { 104 if (*astate == S_OCTAL2 || *astate == S_OCTAL3) { 105 *astate = S_GROUND; 106 return (UNVIS_VALID); 107 } 108 return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD); 109 } 110 111 switch (*astate) { 112 113 case S_GROUND: 114 *cp = 0; 115 if (c == '\\') { 116 *astate = S_START; 117 return (0); 118 } 119 *cp = c; 120 return (UNVIS_VALID); 121 122 case S_START: 123 switch(c) { 124 case '\\': 125 *cp = c; 126 *astate = S_GROUND; 127 return (UNVIS_VALID); 128 case '0': case '1': case '2': case '3': 129 case '4': case '5': case '6': case '7': 130 *cp = (c - '0'); 131 *astate = S_OCTAL2; 132 return (0); 133 case 'M': 134 *cp = (char)0200; 135 *astate = S_META; 136 return (0); 137 case '^': 138 *astate = S_CTRL; 139 return (0); 140 case 'n': 141 *cp = '\n'; 142 *astate = S_GROUND; 143 return (UNVIS_VALID); 144 case 'r': 145 *cp = '\r'; 146 *astate = S_GROUND; 147 return (UNVIS_VALID); 148 case 'b': 149 *cp = '\b'; 150 *astate = S_GROUND; 151 return (UNVIS_VALID); 152 case 'a': 153 *cp = '\007'; 154 *astate = S_GROUND; 155 return (UNVIS_VALID); 156 case 'v': 157 *cp = '\v'; 158 *astate = S_GROUND; 159 return (UNVIS_VALID); 160 case 't': 161 *cp = '\t'; 162 *astate = S_GROUND; 163 return (UNVIS_VALID); 164 case 'f': 165 *cp = '\f'; 166 *astate = S_GROUND; 167 return (UNVIS_VALID); 168 case 's': 169 *cp = ' '; 170 *astate = S_GROUND; 171 return (UNVIS_VALID); 172 case 'E': 173 *cp = '\033'; 174 *astate = S_GROUND; 175 return (UNVIS_VALID); 176 case '\n': 177 /* 178 * hidden newline 179 */ 180 *astate = S_GROUND; 181 return (UNVIS_NOCHAR); 182 case '$': 183 /* 184 * hidden marker 185 */ 186 *astate = S_GROUND; 187 return (UNVIS_NOCHAR); 188 } 189 *astate = S_GROUND; 190 return (UNVIS_SYNBAD); 191 192 case S_META: 193 if (c == '-') 194 *astate = S_META1; 195 else if (c == '^') 196 *astate = S_CTRL; 197 else { 198 *astate = S_GROUND; 199 return (UNVIS_SYNBAD); 200 } 201 return (0); 202 203 case S_META1: 204 *astate = S_GROUND; 205 *cp |= c; 206 return (UNVIS_VALID); 207 208 case S_CTRL: 209 if (c == '?') 210 *cp |= 0177; 211 else 212 *cp |= c & 037; 213 *astate = S_GROUND; 214 return (UNVIS_VALID); 215 216 case S_OCTAL2: /* second possible octal digit */ 217 if (isoctal(c)) { 218 /* 219 * yes - and maybe a third 220 */ 221 *cp = (*cp << 3) + (c - '0'); 222 *astate = S_OCTAL3; 223 return (0); 224 } 225 /* 226 * no - done with current sequence, push back passed char 227 */ 228 *astate = S_GROUND; 229 return (UNVIS_VALIDPUSH); 230 231 case S_OCTAL3: /* third possible octal digit */ 232 *astate = S_GROUND; 233 if (isoctal(c)) { 234 *cp = (*cp << 3) + (c - '0'); 235 return (UNVIS_VALID); 236 } 237 /* 238 * we were done, push back passed char 239 */ 240 return (UNVIS_VALIDPUSH); 241 242 default: 243 /* 244 * decoder in unknown state - (probably uninitialized) 245 */ 246 *astate = S_GROUND; 247 return (UNVIS_SYNBAD); 248 } 249 } 250 251 /* 252 * strunvis - decode src into dst 253 * 254 * Number of chars decoded into dst is returned, -1 on error. 255 * Dst is null terminated. 256 */ 257 258 int 259 strunvis(dst, src) 260 char *dst; 261 const char *src; 262 { 263 char c; 264 char *start = dst; 265 int state = 0; 266 267 _DIAGASSERT(src != NULL); 268 _DIAGASSERT(dst != NULL); 269 270 while ((c = *src++) != '\0') { 271 again: 272 switch (__unvis13(dst, c, &state, 0)) { 273 case UNVIS_VALID: 274 dst++; 275 break; 276 case UNVIS_VALIDPUSH: 277 dst++; 278 goto again; 279 case 0: 280 case UNVIS_NOCHAR: 281 break; 282 default: 283 return (-1); 284 } 285 } 286 if (__unvis13(dst, c, &state, UNVIS_END) == UNVIS_VALID) 287 dst++; 288 *dst = '\0'; 289 return (dst - start); 290 } 291 #endif 292
Indexes created Sun Sep 21 20:09:37 GMT 2025