gen/vis-fbsd.c

   1 /*-
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. 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 defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)vis.c       8.1 (Berkeley) 7/19/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/gen/vis.c,v 1.13 2003/10/30 12:41:50 phk Exp $");
  39
  40 #include "xlocale_private.h"
  41
  42 #include <sys/types.h>
  43 #include <limits.h>
  44 #include <ctype.h>
  45 #include <stdio.h>
  46 #include <vis.h>
  47
  48 #define isoctal(c)      (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
  49
  50 /*
  51  * vis - visually encode characters
  52  */
  53 char *
  54 vis(dst, c, flag, nextc)
  55         char *dst;
  56         int c, nextc;
  57         int flag;
  58 {
  59         locale_t loc = __current_locale();
  60
  61         c = (unsigned char)c;
  62
  63         if (flag & VIS_HTTPSTYLE) {
  64                 /* Described in RFC 1808 */
  65                 if (!(isalnum_l(c, loc) /* alpha-numeric */
  66                     /* safe */
  67                     || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
  68                     /* extra */
  69                     || c == '!' || c == '*' || c == '\'' || c == '('
  70                     || c == ')' || c == ',')) {
  71                         *dst++ = '%';
  72                         snprintf_l(dst, 4, loc, (c < 16 ? "0%X" : "%X"), c);
  73                         dst += 2;
  74                         goto done;
  75                 }
  76         }
  77
  78         if ((flag & VIS_GLOB) &&
  79             (c == '*' || c == '?' || c == '[' || c == '#'))
  80                 ;
  81         else if (isgraph_l(c, loc) ||
  82            ((flag & VIS_SP) == 0 && c == ' ') ||
  83            ((flag & VIS_TAB) == 0 && c == '\t') ||
  84            ((flag & VIS_NL) == 0 && c == '\n') ||
  85            ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
  86                 *dst++ = c;
  87                 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
  88                         *dst++ = '\\';
  89                 *dst = '\0';
  90                 return (dst);
  91         }
  92
  93         if (flag & VIS_CSTYLE) {
  94                 switch(c) {
  95                 case '\n':
  96                         *dst++ = '\\';
  97                         *dst++ = 'n';
  98                         goto done;
  99                 case '\r':
 100                         *dst++ = '\\';
 101                         *dst++ = 'r';
 102                         goto done;
 103                 case '\b':
 104                         *dst++ = '\\';
 105                         *dst++ = 'b';
 106                         goto done;
 107                 case '\a':
 108                         *dst++ = '\\';
 109                         *dst++ = 'a';
 110                         goto done;
 111                 case '\v':
 112                         *dst++ = '\\';
 113                         *dst++ = 'v';
 114                         goto done;
 115                 case '\t':
 116                         *dst++ = '\\';
 117                         *dst++ = 't';
 118                         goto done;
 119                 case '\f':
 120                         *dst++ = '\\';
 121                         *dst++ = 'f';
 122                         goto done;
 123                 case ' ':
 124                         *dst++ = '\\';
 125                         *dst++ = 's';
 126                         goto done;
 127                 case '\0':
 128                         *dst++ = '\\';
 129                         *dst++ = '0';
 130                         if (isoctal(nextc)) {
 131                                 *dst++ = '0';
 132                                 *dst++ = '0';
 133                         }
 134                         goto done;
 135                 }
 136         }
 137         if (((c & 0177) == ' ') || isgraph_l(c, loc) || (flag & VIS_OCTAL)) {
 138                 *dst++ = '\\';
 139                 *dst++ = ((u_char)c >> 6 & 07) + '0';
 140                 *dst++ = ((u_char)c >> 3 & 07) + '0';
 141                 *dst++ = ((u_char)c & 07) + '0';
 142                 goto done;
 143         }
 144         if ((flag & VIS_NOSLASH) == 0)
 145                 *dst++ = '\\';
 146         if (c & 0200) {
 147                 c &= 0177;
 148                 *dst++ = 'M';
 149         }
 150         if (iscntrl_l(c, loc)) {
 151                 *dst++ = '^';
 152                 if (c == 0177)
 153                         *dst++ = '?';
 154                 else
 155                         *dst++ = c + '@';
 156         } else {
 157                 *dst++ = '-';
 158                 *dst++ = c;
 159         }
 160 done:
 161         *dst = '\0';
 162         return (dst);
 163 }
 164
 165 /*
 166  * strvis, strvisx - visually encode characters from src into dst
 167  *
 168  *      Dst must be 4 times the size of src to account for possible
 169  *      expansion.  The length of dst, not including the trailing NUL,
 170  *      is returned.
 171  *
 172  *      Strvisx encodes exactly len bytes from src into dst.
 173  *      This is useful for encoding a block of data.
 174  */
 175 int
 176 strvis(dst, src, flag)
 177         char *dst;
 178         const char *src;
 179         int flag;
 180 {
 181         char c;
 182         char *start;
 183
 184         for (start = dst; (c = *src); )
 185                 dst = vis(dst, c, flag, *++src);
 186         *dst = '\0';
 187         return (dst - start);
 188 }
 189
 190 int
 191 strvisx(dst, src, len, flag)
 192         char *dst;
 193         const char *src;
 194         size_t len;
 195         int flag;
 196 {
 197         int c;
 198         char *start;
 199
 200         for (start = dst; len > 1; len--) {
 201                 c = *src;
 202                 dst = vis(dst, c, flag, *++src);
 203         }
 204         if (len)
 205                 dst = vis(dst, *src, flag, '\0');
 206         *dst = '\0';
 207
 208         return (dst - start);
 209 }