1 /*- 2 * Copyright (c) 1989 The Regents of the University of California. 3 * 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[] = "from: @(#)vis.c 5.6 (Berkeley) 2/5/92";*/ 36 static char rcsid[] = "$Id: vis.c,v 1.3 1993/07/30 07:57:54 mycroft Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/types.h> 40 #include <limits.h> 41 #include <ctype.h> 42 #include <vis.h> 43 44 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 45 46 /* 47 * vis - visually encode characters 48 */ 49 char * 50 vis(dst, c, flag, nextc) 51 register char *dst; 52 int c, nextc; 53 register int flag; 54 { 55 if ((u_int)c <= UCHAR_MAX && isgraph(c) || 56 ((flag & VIS_SP) == 0 && c == ' ') || 57 ((flag & VIS_TAB) == 0 && c == '\t') || 58 ((flag & VIS_NL) == 0 && c == '\n') || 59 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) { 60 *dst++ = c; 61 if (c == '\\' && (flag & VIS_NOSLASH) == 0) 62 *dst++ = '\\'; 63 *dst = '\0'; 64 return (dst); 65 } 66 67 if (flag & VIS_CSTYLE) { 68 switch(c) { 69 case '\n': 70 *dst++ = '\\'; 71 *dst++ = 'n'; 72 goto done; 73 case '\r': 74 *dst++ = '\\'; 75 *dst++ = 'r'; 76 goto done; 77 case '\b': 78 *dst++ = '\\'; 79 *dst++ = 'b'; 80 goto done; 81 #if __STDC__ 82 case '\a': 83 #else 84 case '\007': 85 #endif 86 *dst++ = '\\'; 87 *dst++ = 'a'; 88 goto done; 89 case '\v': 90 *dst++ = '\\'; 91 *dst++ = 'v'; 92 goto done; 93 case '\t': 94 *dst++ = '\\'; 95 *dst++ = 't'; 96 goto done; 97 case '\f': 98 *dst++ = '\\'; 99 *dst++ = 'f'; 100 goto done; 101 case ' ': 102 *dst++ = '\\'; 103 *dst++ = 's'; 104 goto done; 105 case '\0': 106 *dst++ = '\\'; 107 *dst++ = '0'; 108 if (isoctal(nextc)) { 109 *dst++ = '0'; 110 *dst++ = '0'; 111 } 112 goto done; 113 } 114 } 115 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) { 116 *dst++ = '\\'; 117 *dst++ = ((u_char)c >> 6 & 07) + '0'; 118 *dst++ = ((u_char)c >> 3 & 07) + '0'; 119 *dst++ = ((u_char)c & 07) + '0'; 120 goto done; 121 } 122 if ((flag & VIS_NOSLASH) == 0) 123 *dst++ = '\\'; 124 if (c & 0200) { 125 c &= 0177; 126 *dst++ = 'M'; 127 } 128 if (iscntrl(c)) { 129 *dst++ = '^'; 130 if (c == 0177) 131 *dst++ = '?'; 132 else 133 *dst++ = c + '@'; 134 } else { 135 *dst++ = '-'; 136 *dst++ = c; 137 } 138 done: 139 *dst = '\0'; 140 return (dst); 141 } 142 143 /* 144 * strvis, strvisx - visually encode characters from src into dst 145 * 146 * Dst must be 4 times the size of src to account for possible 147 * expansion. The length of dst, not including the trailing NULL, 148 * is returned. 149 * 150 * Strvisx encodes exactly len bytes from src into dst. 151 * This is useful for encoding a block of data. 152 */ 153 int 154 strvis(dst, src, flag) 155 register char *dst; 156 register const char *src; 157 int flag; 158 { 159 register char c; 160 char *start; 161 162 for (start = dst; c = *src;) 163 dst = vis(dst, c, flag, *++src); 164 *dst = '\0'; 165 return (dst - start); 166 } 167 168 int 169 strvisx(dst, src, len, flag) 170 register char *dst; 171 register const char *src; 172 register size_t len; 173 int flag; 174 { 175 char *start = dst; 176 177 while (len > 1) { 178 dst = vis(dst, *src, flag, *(src+1)); 179 len--; 180 } 181 if (len) 182 dst = vis(dst, *src, flag, '\0'); 183 184 return (dst - start); 185 } 186