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 * $FreeBSD: src/lib/libc/gen/vis.c,v 1.5.8.2 2001/03/05 09:44:34 obrien Exp $ 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 7/19/93"; 38 #endif /* LIBC_SCCS and not lint */ 39 40 #include <sys/types.h> 41 #include <limits.h> 42 #include <ctype.h> 43 #include <stdio.h> 44 #include <vis.h> 45 46 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 47 48 /* 49 * vis - visually encode characters 50 */ 51 char * 52 vis(dst, c, flag, nextc) 53 register char *dst; 54 int c, nextc; 55 register int flag; 56 { 57 c = (unsigned char)c; 58 59 if (flag & VIS_HTTPSTYLE) { 60 /* Described in RFC 1808 */ 61 if (!(isalnum(c) /* alpha-numeric */ 62 /* safe */ 63 || c == '$' || c == '-' || c == '_' || c == '.' || c == '+' 64 /* extra */ 65 || c == '!' || c == '*' || c == '\'' || c == '(' 66 || c == ')' || c == ',')) { 67 *dst++ = '%'; 68 snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c); 69 dst += 2; 70 goto done; 71 } 72 } 73 74 if (isgraph(c) || 75 ((flag & VIS_SP) == 0 && c == ' ') || 76 ((flag & VIS_TAB) == 0 && c == '\t') || 77 ((flag & VIS_NL) == 0 && c == '\n') || 78 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) { 79 *dst++ = c; 80 if (c == '\\' && (flag & VIS_NOSLASH) == 0) 81 *dst++ = '\\'; 82 *dst = '\0'; 83 return (dst); 84 } 85 86 if (flag & VIS_CSTYLE) { 87 switch(c) { 88 case '\n': 89 *dst++ = '\\'; 90 *dst++ = 'n'; 91 goto done; 92 case '\r': 93 *dst++ = '\\'; 94 *dst++ = 'r'; 95 goto done; 96 case '\b': 97 *dst++ = '\\'; 98 *dst++ = 'b'; 99 goto done; 100 #if __STDC__ 101 case '\a': 102 #else 103 case '\007': 104 #endif 105 *dst++ = '\\'; 106 *dst++ = 'a'; 107 goto done; 108 case '\v': 109 *dst++ = '\\'; 110 *dst++ = 'v'; 111 goto done; 112 case '\t': 113 *dst++ = '\\'; 114 *dst++ = 't'; 115 goto done; 116 case '\f': 117 *dst++ = '\\'; 118 *dst++ = 'f'; 119 goto done; 120 case ' ': 121 *dst++ = '\\'; 122 *dst++ = 's'; 123 goto done; 124 case '\0': 125 *dst++ = '\\'; 126 *dst++ = '0'; 127 if (isoctal(nextc)) { 128 *dst++ = '0'; 129 *dst++ = '0'; 130 } 131 goto done; 132 } 133 } 134 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) { 135 *dst++ = '\\'; 136 *dst++ = ((u_char)c >> 6 & 07) + '0'; 137 *dst++ = ((u_char)c >> 3 & 07) + '0'; 138 *dst++ = ((u_char)c & 07) + '0'; 139 goto done; 140 } 141 if ((flag & VIS_NOSLASH) == 0) 142 *dst++ = '\\'; 143 if (c & 0200) { 144 c &= 0177; 145 *dst++ = 'M'; 146 } 147 if (iscntrl(c)) { 148 *dst++ = '^'; 149 if (c == 0177) 150 *dst++ = '?'; 151 else 152 *dst++ = c + '@'; 153 } else { 154 *dst++ = '-'; 155 *dst++ = c; 156 } 157 done: 158 *dst = '\0'; 159 return (dst); 160 } 161 162 /* 163 * strvis, strvisx - visually encode characters from src into dst 164 * 165 * Dst must be 4 times the size of src to account for possible 166 * expansion. The length of dst, not including the trailing NULL, 167 * is returned. 168 * 169 * Strvisx encodes exactly len bytes from src into dst. 170 * This is useful for encoding a block of data. 171 */ 172 int 173 strvis(dst, src, flag) 174 register char *dst; 175 register const char *src; 176 int flag; 177 { 178 register char c; 179 char *start; 180 181 for (start = dst; (c = *src); ) 182 dst = vis(dst, c, flag, *++src); 183 *dst = '\0'; 184 return (dst - start); 185 } 186 187 int 188 strvisx(dst, src, len, flag) 189 register char *dst; 190 register const char *src; 191 register size_t len; 192 int flag; 193 { 194 int c; 195 char *start; 196 197 for (start = dst; len > 1; len--) { 198 c = *src; 199 dst = vis(dst, c, flag, *++src); 200 } 201 if (len) 202 dst = vis(dst, *src, flag, '\0'); 203 *dst = '\0'; 204 205 return (dst - start); 206 } 207