crypto/external/bsd/heimdal/dist/lib/roken/unvis.c

   1 /*      $NetBSD: unvis.c,v 1.1.1.2 2014/04/24 12:45:52 pettai 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 }