| Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 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 rcsid[] = "$OpenBSD: vis.c,v 1.5 2000/07/19 15:25:13 deraadt Exp $"; |
| 36 | #endif /* LIBC_SCCS and not lint */ |
| 37 | |
| 38 | #ifndef HAVE_VIS |
| 39 | |
| 40 | #include "includes.h" |
| 41 | |
| 42 | #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') |
| 43 | |
| 44 | /* |
| 45 | * vis - visually encode characters |
| 46 | */ |
| 47 | char *vis(char *dst, int c, int flag, int nextc) |
| 48 | { |
| 49 | if (((u_int)c <= UCHAR_MAX && isascii((u_char)c) && |
| 50 | isgraph((u_char)c)) || |
| 51 | ((flag & VIS_SP) == 0 && c == ' ') || |
| 52 | ((flag & VIS_TAB) == 0 && c == '\t') || |
| 53 | ((flag & VIS_NL) == 0 && c == '\n') || |
| 54 | ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) { |
| 55 | *dst++ = c; |
| 56 | if (c == '\\' && (flag & VIS_NOSLASH) == 0) |
| 57 | *dst++ = '\\'; |
| 58 | *dst = '\0'; |
| 59 | return (dst); |
| 60 | } |
| 61 | |
| 62 | if (flag & VIS_CSTYLE) { |
| 63 | switch(c) { |
| 64 | case '\n': |
| 65 | *dst++ = '\\'; |
| 66 | *dst++ = 'n'; |
| 67 | goto done; |
| 68 | case '\r': |
| 69 | *dst++ = '\\'; |
| 70 | *dst++ = 'r'; |
| 71 | goto done; |
| 72 | case '\b': |
| 73 | *dst++ = '\\'; |
| 74 | *dst++ = 'b'; |
| 75 | goto done; |
| 76 | #ifdef __STDC__ |
| 77 | case '\a': |
| 78 | #else |
| 79 | case '\007': |
| 80 | #endif |
| 81 | *dst++ = '\\'; |
| 82 | *dst++ = 'a'; |
| 83 | goto done; |
| 84 | case '\v': |
| 85 | *dst++ = '\\'; |
| 86 | *dst++ = 'v'; |
| 87 | goto done; |
| 88 | case '\t': |
| 89 | *dst++ = '\\'; |
| 90 | *dst++ = 't'; |
| 91 | goto done; |
| 92 | case '\f': |
| 93 | *dst++ = '\\'; |
| 94 | *dst++ = 'f'; |
| 95 | goto done; |
| 96 | case ' ': |
| 97 | *dst++ = '\\'; |
| 98 | *dst++ = 's'; |
| 99 | goto done; |
| 100 | case '\0': |
| 101 | *dst++ = '\\'; |
| 102 | *dst++ = '0'; |
| 103 | if (isoctal(nextc)) { |
| 104 | *dst++ = '0'; |
| 105 | *dst++ = '0'; |
| 106 | } |
| 107 | goto done; |
| 108 | } |
| 109 | } |
| 110 | if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) { |
| 111 | *dst++ = '\\'; |
| 112 | *dst++ = ((u_char)c >> 6 & 07) + '0'; |
| 113 | *dst++ = ((u_char)c >> 3 & 07) + '0'; |
| 114 | *dst++ = ((u_char)c & 07) + '0'; |
| 115 | goto done; |
| 116 | } |
| 117 | if ((flag & VIS_NOSLASH) == 0) |
| 118 | *dst++ = '\\'; |
| 119 | if (c & 0200) { |
| 120 | c &= 0177; |
| 121 | *dst++ = 'M'; |
| 122 | } |
| 123 | if (iscntrl(c)) { |
| 124 | *dst++ = '^'; |
| 125 | if (c == 0177) |
| 126 | *dst++ = '?'; |
| 127 | else |
| 128 | *dst++ = c + '@'; |
| 129 | } else { |
| 130 | *dst++ = '-'; |
| 131 | *dst++ = c; |
| 132 | } |
| 133 | done: |
| 134 | *dst = '\0'; |
| 135 | return (dst); |
| 136 | } |
| 137 | #endif /* HAVE_VIS */ |