vis.c revision 1.12
1 /* $NetBSD: vis.c,v 1.12 1999/09/16 11:45:07 lukem 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 7/19/93"; 40 #else 41 __RCSID("$NetBSD: vis.c,v 1.12 1999/09/16 11:45:07 lukem Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 48 #include <assert.h> 49 #include <ctype.h> 50 #include <limits.h> 51 #include <stdio.h> 52 #include <vis.h> 53 54 #ifdef __weak_alias 55 __weak_alias(strvis,_strvis); 56 __weak_alias(strvisx,_strvisx); 57 __weak_alias(vis,_vis); 58 #endif 59 60 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 61 62 /* 63 * vis - visually encode characters 64 */ 65 char * 66 vis(dst, c, flag, nextc) 67 char *dst; 68 int c, nextc; 69 int flag; 70 { 71 72 _DIAGASSERT(dst != NULL); 73 #ifdef _DIAGNOSTIC 74 if (dst == NULL) 75 return (NULL); 76 #endif 77 78 if (((u_int)c <= UCHAR_MAX && isascii(c) && isgraph(c)) || 79 ((flag & VIS_SP) == 0 && c == ' ') || 80 ((flag & VIS_TAB) == 0 && c == '\t') || 81 ((flag & VIS_NL) == 0 && c == '\n') || 82 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) { 83 *dst++ = c; 84 if (c == '\\' && (flag & VIS_NOSLASH) == 0) 85 *dst++ = '\\'; 86 *dst = '\0'; 87 return (dst); 88 } 89 90 if (flag & VIS_CSTYLE) { 91 switch(c) { 92 case '\n': 93 *dst++ = '\\'; 94 *dst++ = 'n'; 95 goto done; 96 case '\r': 97 *dst++ = '\\'; 98 *dst++ = 'r'; 99 goto done; 100 case '\b': 101 *dst++ = '\\'; 102 *dst++ = 'b'; 103 goto done; 104 #if __STDC__ 105 case '\a': 106 #else 107 case '\007': 108 #endif 109 *dst++ = '\\'; 110 *dst++ = 'a'; 111 goto done; 112 case '\v': 113 *dst++ = '\\'; 114 *dst++ = 'v'; 115 goto done; 116 case '\t': 117 *dst++ = '\\'; 118 *dst++ = 't'; 119 goto done; 120 case '\f': 121 *dst++ = '\\'; 122 *dst++ = 'f'; 123 goto done; 124 case ' ': 125 *dst++ = '\\'; 126 *dst++ = 's'; 127 goto done; 128 case '\0': 129 *dst++ = '\\'; 130 *dst++ = '0'; 131 if (isoctal(nextc)) { 132 *dst++ = '0'; 133 *dst++ = '0'; 134 } 135 goto done; 136 } 137 } 138 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) { 139 *dst++ = '\\'; 140 *dst++ = ((((u_int32_t)c) >> 6) & 07) + '0'; 141 *dst++ = ((((u_int32_t)c) >> 3) & 07) + '0'; 142 *dst++ = (((u_char)c) & 07) + '0'; 143 goto done; 144 } 145 if ((flag & VIS_NOSLASH) == 0) 146 *dst++ = '\\'; 147 if (c & 0200) { 148 c &= 0177; 149 *dst++ = 'M'; 150 } 151 if (iscntrl(c)) { 152 *dst++ = '^'; 153 if (c == 0177) 154 *dst++ = '?'; 155 else 156 *dst++ = c + '@'; 157 } else { 158 *dst++ = '-'; 159 *dst++ = c; 160 } 161 done: 162 *dst = '\0'; 163 return (dst); 164 } 165 166 /* 167 * strvis, strvisx - visually encode characters from src into dst 168 * 169 * Dst must be 4 times the size of src to account for possible 170 * expansion. The length of dst, not including the trailing NULL, 171 * is returned. 172 * 173 * Strvisx encodes exactly len bytes from src into dst. 174 * This is useful for encoding a block of data. 175 */ 176 int 177 strvis(dst, src, flag) 178 char *dst; 179 const char *src; 180 int flag; 181 { 182 char c; 183 char *start; 184 185 _DIAGASSERT(dst != NULL); 186 _DIAGASSERT(src != NULL); 187 #ifdef _DIAGNOSTIC 188 if (dst == NULL || src == NULL) 189 return (0); 190 #endif 191 192 for (start = dst; (c = *src) != '\0';) 193 dst = vis(dst, c, flag, *++src); 194 *dst = '\0'; 195 return (dst - start); 196 } 197 198 int 199 strvisx(dst, src, len, flag) 200 char *dst; 201 const char *src; 202 size_t len; 203 int flag; 204 { 205 char c; 206 char *start; 207 208 _DIAGASSERT(dst != NULL); 209 _DIAGASSERT(src != NULL); 210 #ifdef _DIAGNOSTIC 211 if (dst == NULL || src == NULL) 212 return (0); 213 #endif 214 215 for (start = dst; len > 1; len--) { 216 c = *src; 217 dst = vis(dst, c, flag, *++src); 218 } 219 if (len) 220 dst = vis(dst, *src, flag, '\0'); 221 *dst = '\0'; 222 223 return (dst - start); 224 } 225
Indexes created Tue Sep 23 07:09:52 GMT 2025