crypto/heimdal-0.6.3/lib/roken/vis.c

   1 /*      $NetBSD: vis.c,v 1.19 2000/01/22 22:42:45 mycroft Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
   5  * Copyright (c) 1989, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37
  38 #if 1
  39 #ifdef HAVE_CONFIG_H
  40 #include <config.h>
  41 RCSID("$Id: vis.c,v 1.5 2001/09/03 05:37:23 assar Exp $");
  42 #endif
  43 #include <roken.h>
  44 #ifndef _DIAGASSERT
  45 #define _DIAGASSERT(X)
  46 #endif
  47 #else
  48 #include <sys/cdefs.h>
  49 #if !defined(lint)
  50 __RCSID("$NetBSD: vis.c,v 1.19 2000/01/22 22:42:45 mycroft Exp $");
  51 #endif /* not lint */
  52 #endif
  53
  54 #if 0
  55 #include "namespace.h"
  56 #endif
  57 #include <sys/types.h>
  58
  59 #include <assert.h>
  60 #include <ctype.h>
  61 #include <limits.h>
  62 #include <stdio.h>
  63 #include <string.h>
  64 #include <vis.h>
  65
  66 #if 0
  67 #ifdef __weak_alias
  68 __weak_alias(strsvis,_strsvis)
  69 __weak_alias(strsvisx,_strsvisx)
  70 __weak_alias(strvis,_strvis)
  71 __weak_alias(strvisx,_strvisx)
  72 __weak_alias(svis,_svis)
  73 __weak_alias(vis,_vis)
  74 #endif
  75 #endif
  76
  77 #undef BELL
  78 #if defined(__STDC__)
  79 #define BELL '\a'
  80 #else
  81 #define BELL '\007'
  82 #endif
  83
  84 #define isoctal(c)      (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
  85 #define iswhite(c)      (c == ' ' || c == '\t' || c == '\n')
  86 #define issafe(c)       (c == '\b' || c == BELL || c == '\r')
  87
  88 #define MAXEXTRAS       5
  89
  90
  91 #define MAKEEXTRALIST(flag, extra)                                            \
  92 do {                                                                          \
  93         char *pextra = extra;                                                 \
  94         if (flag & VIS_SP) *pextra++ = ' ';                                   \
  95         if (flag & VIS_TAB) *pextra++ = '\t';                                 \
  96         if (flag & VIS_NL) *pextra++ = '\n';                                  \
  97         if ((flag & VIS_NOSLASH) == 0) *pextra++ = '\\';                      \
  98         *pextra = '\0';                                                       \
  99 } while (/*CONSTCOND*/0)
 100
 101 /*
 102  * This is SVIS, the central macro of vis.
 103  * dst:       Pointer to the destination buffer
 104  * c:         Character to encode
 105  * flag:      Flag word
 106  * nextc:     The character following 'c'
 107  * extra:     Pointer to the list of extra characters to be
 108  *            backslash-protected.
 109  */
 110 #define SVIS(dst, c, flag, nextc, extra)                                   \
 111 do {                                                                       \
 112         int isextra, isc;                                                  \
 113         isextra = strchr(extra, c) != NULL;                                \
 114         if (!isextra &&                                                    \
 115             isascii((unsigned char)c) &&                                   \
 116             (isgraph((unsigned char)c) || iswhite(c) ||                    \
 117             ((flag & VIS_SAFE) && issafe(c)))) {                           \
 118                 *dst++ = c;                                                \
 119                 break;                                                     \
 120         }                                                                  \
 121         isc = 0;                                                           \
 122         if (flag & VIS_CSTYLE) {                                           \
 123                 switch (c) {                                               \
 124                 case '\n':                                                 \
 125                         isc = 1; *dst++ = '\\'; *dst++ = 'n';              \
 126                         break;                                             \
 127                 case '\r':                                                 \
 128                         isc = 1; *dst++ = '\\'; *dst++ = 'r';              \
 129                         break;                                             \
 130                 case '\b':                                                 \
 131                         isc = 1; *dst++ = '\\'; *dst++ = 'b';              \
 132                         break;                                             \
 133                 case BELL:                                                 \
 134                         isc = 1; *dst++ = '\\'; *dst++ = 'a';              \
 135                         break;                                             \
 136                 case '\v':                                                 \
 137                         isc = 1; *dst++ = '\\'; *dst++ = 'v';              \
 138                         break;                                             \
 139                 case '\t':                                                 \
 140                         isc = 1; *dst++ = '\\'; *dst++ = 't';              \
 141                         break;                                             \
 142                 case '\f':                                                 \
 143                         isc = 1; *dst++ = '\\'; *dst++ = 'f';              \
 144                         break;                                             \
 145                 case ' ':                                                  \
 146                         isc = 1; *dst++ = '\\'; *dst++ = 's';              \
 147                         break;                                             \
 148                 case '\0':                                                 \
 149                         isc = 1; *dst++ = '\\'; *dst++ = '0';              \
 150                         if (isoctal(nextc)) {                              \
 151                                 *dst++ = '0';                              \
 152                                 *dst++ = '0';                              \
 153                         }                                                  \
 154                 }                                                          \
 155         }                                                                  \
 156         if (isc) break;                                                    \
 157         if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) {        \
 158                 *dst++ = '\\';                                             \
 159                 *dst++ = (u_char)(((unsigned)(u_char)c >> 6) & 03) + '0';  \
 160                 *dst++ = (u_char)(((unsigned)(u_char)c >> 3) & 07) + '0';  \
 161                 *dst++ =                             (c       & 07) + '0'; \
 162         } else {                                                           \
 163                 if ((flag & VIS_NOSLASH) == 0) *dst++ = '\\';              \
 164                 if (c & 0200) {                                            \
 165                         c &= 0177; *dst++ = 'M';                           \
 166                 }                                                          \
 167                 if (iscntrl((unsigned char)c)) {                           \
 168                         *dst++ = '^';                                      \
 169                         if (c == 0177)                                     \
 170                                 *dst++ = '?';                              \
 171                         else                                               \
 172                                 *dst++ = c + '@';                          \
 173                 } else {                                                   \
 174                         *dst++ = '-'; *dst++ = c;                          \
 175                 }                                                          \
 176         }                                                                  \
 177 } while (/*CONSTCOND*/0)
 178
 179
 180 /*
 181  * svis - visually encode characters, also encoding the characters
 182  *        pointed to by `extra'
 183  */
 184 #ifndef HAVE_SVIS
 185 char *
 186 svis(char *dst, int c, int flag, int nextc, const char *extra)
 187 {
 188         _DIAGASSERT(dst != NULL);
 189         _DIAGASSERT(extra != NULL);
 190
 191         SVIS(dst, c, flag, nextc, extra);
 192         *dst = '\0';
 193         return(dst);
 194 }
 195 #endif
 196
 197
 198 /*
 199  * strsvis, strsvisx - visually encode characters from src into dst
 200  *
 201  *      Extra is a pointer to a \0-terminated list of characters to
 202  *      be encoded, too. These functions are useful e. g. to
 203  *      encode strings in such a way so that they are not interpreted
 204  *      by a shell.
 205  *
 206  *      Dst must be 4 times the size of src to account for possible
 207  *      expansion.  The length of dst, not including the trailing NULL,
 208  *      is returned.
 209  *
 210  *      Strsvisx encodes exactly len bytes from src into dst.
 211  *      This is useful for encoding a block of data.
 212  */
 213 #ifndef HAVE_STRSVIS
 214 int
 215 strsvis(char *dst, const char *src, int flag, const char *extra)
 216 {
 217         char c;
 218         char *start;
 219
 220         _DIAGASSERT(dst != NULL);
 221         _DIAGASSERT(src != NULL);
 222         _DIAGASSERT(extra != NULL);
 223
 224         for (start = dst; (c = *src++) != '\0'; /* empty */)
 225             SVIS(dst, c, flag, *src, extra);
 226         *dst = '\0';
 227         return (dst - start);
 228 }
 229 #endif
 230
 231
 232 #ifndef HAVE_STRVISX
 233 int
 234 strsvisx(char *dst, const char *src, size_t len, int flag, const char *extra)
 235 {
 236         char c;
 237         char *start;
 238
 239         _DIAGASSERT(dst != NULL);
 240         _DIAGASSERT(src != NULL);
 241         _DIAGASSERT(extra != NULL);
 242
 243         for (start = dst; len > 0; len--) {
 244                 c = *src++;
 245                 SVIS(dst, c, flag, len ? *src : '\0', extra);
 246         }
 247         *dst = '\0';
 248         return (dst - start);
 249 }
 250 #endif
 251
 252
 253 /*
 254  * vis - visually encode characters
 255  */
 256 #ifndef HAVE_VIS
 257 char *
 258 vis(char *dst, int c, int flag, int nextc)
 259 {
 260         char extra[MAXEXTRAS];
 261
 262         _DIAGASSERT(dst != NULL);
 263
 264         MAKEEXTRALIST(flag, extra);
 265         SVIS(dst, c, flag, nextc, extra);
 266         *dst = '\0';
 267         return (dst);
 268 }
 269 #endif
 270
 271
 272 /*
 273  * strvis, strvisx - visually encode characters from src into dst
 274  *
 275  *      Dst must be 4 times the size of src to account for possible
 276  *      expansion.  The length of dst, not including the trailing NULL,
 277  *      is returned.
 278  *
 279  *      Strvisx encodes exactly len bytes from src into dst.
 280  *      This is useful for encoding a block of data.
 281  */
 282 #ifndef HAVE_STRVIS
 283 int
 284 strvis(char *dst, const char *src, int flag)
 285 {
 286         char extra[MAXEXTRAS];
 287
 288         MAKEEXTRALIST(flag, extra);
 289         return (strsvis(dst, src, flag, extra));
 290 }
 291 #endif
 292
 293
 294 #ifndef HAVE_STRVISX
 295 int
 296 strvisx(char *dst, const char *src, size_t len, int flag)
 297 {
 298         char extra[MAXEXTRAS];
 299
 300         MAKEEXTRALIST(flag, extra);
 301         return (strsvisx(dst, src, len, flag, extra));
 302 }
 303 #endif