1 /* $NetBSD: vis.c,v 1.6 1995/02/25 15:40:09 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 7/19/93"; 39 #else 40 static char rcsid[] = "$NetBSD: vis.c,v 1.6 1995/02/25 15:40:09 cgd Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/types.h> 45 #include <limits.h> 46 #include <ctype.h> 47 #include <vis.h> 48 49 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 50 51 /* 52 * vis - visually encode characters 53 */ 54 char * 55 vis(dst, c, flag, nextc) 56 register char *dst; 57 int c, nextc; 58 register int flag; 59 { 60 if ((u_int)c <= UCHAR_MAX && isascii(c) && isgraph(c) || 61 ((flag & VIS_SP) == 0 && c == ' ') || 62 ((flag & VIS_TAB) == 0 && c == '\t') || 63 ((flag & VIS_NL) == 0 && c == '\n') || 64 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) { 65 *dst++ = c; 66 if (c == '\\' && (flag & VIS_NOSLASH) == 0) 67 *dst++ = '\\'; 68 *dst = '\0'; 69 return (dst); 70 } 71 72 if (flag & VIS_CSTYLE) { 73 switch(c) { 74 case '\n': 75 *dst++ = '\\'; 76 *dst++ = 'n'; 77 goto done; 78 case '\r': 79 *dst++ = '\\'; 80 *dst++ = 'r'; 81 goto done; 82 case '\b': 83 *dst++ = '\\'; 84 *dst++ = 'b'; 85 goto done; 86 #if __STDC__ 87 case '\a': 88 #else 89 case '\007': 90 #endif 91 *dst++ = '\\'; 92 *dst++ = 'a'; 93 goto done; 94 case '\v': 95 *dst++ = '\\'; 96 *dst++ = 'v'; 97 goto done; 98 case '\t': 99 *dst++ = '\\'; 100 *dst++ = 't'; 101 goto done; 102 case '\f': 103 *dst++ = '\\'; 104 *dst++ = 'f'; 105 goto done; 106 case ' ': 107 *dst++ = '\\'; 108 *dst++ = 's'; 109 goto done; 110 case '\0': 111 *dst++ = '\\'; 112 *dst++ = '0'; 113 if (isoctal(nextc)) { 114 *dst++ = '0'; 115 *dst++ = '0'; 116 } 117 goto done; 118 } 119 } 120 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) { 121 *dst++ = '\\'; 122 *dst++ = ((u_char)c >> 6 & 07) + '0'; 123 *dst++ = ((u_char)c >> 3 & 07) + '0'; 124 *dst++ = ((u_char)c & 07) + '0'; 125 goto done; 126 } 127 if ((flag & VIS_NOSLASH) == 0) 128 *dst++ = '\\'; 129 if (c & 0200) { 130 c &= 0177; 131 *dst++ = 'M'; 132 } 133 if (iscntrl(c)) { 134 *dst++ = '^'; 135 if (c == 0177) 136 *dst++ = '?'; 137 else 138 *dst++ = c + '@'; 139 } else { 140 *dst++ = '-'; 141 *dst++ = c; 142 } 143 done: 144 *dst = '\0'; 145 return (dst); 146 } 147 148 /* 149 * strvis, strvisx - visually encode characters from src into dst 150 * 151 * Dst must be 4 times the size of src to account for possible 152 * expansion. The length of dst, not including the trailing NULL, 153 * is returned. 154 * 155 * Strvisx encodes exactly len bytes from src into dst. 156 * This is useful for encoding a block of data. 157 */ 158 int 159 strvis(dst, src, flag) 160 register char *dst; 161 register const char *src; 162 int flag; 163 { 164 register char c; 165 char *start; 166 167 for (start = dst; c = *src;) 168 dst = vis(dst, c, flag, *++src); 169 *dst = '\0'; 170 return (dst - start); 171 } 172 173 int 174 strvisx(dst, src, len, flag) 175 register char *dst; 176 register const char *src; 177 register size_t len; 178 int flag; 179 { 180 register char c; 181 char *start; 182 183 for (start = dst; len > 1; len--) { 184 c = *src; 185 dst = vis(dst, c, flag, *++src); 186 } 187 if (len) 188 dst = vis(dst, *src, flag, '\0'); 189 *dst = '\0'; 190 191 return (dst - start); 192 } 193