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224c7076 A |
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 sccsid[] = "@(#)vis.c 8.1 (Berkeley) 7/19/93"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | #include <sys/cdefs.h> | |
38 | __FBSDID("$FreeBSD: src/lib/libc/gen/vis.c,v 1.13 2003/10/30 12:41:50 phk Exp $"); | |
39 | ||
40 | #include "xlocale_private.h" | |
41 | ||
42 | #include <sys/types.h> | |
43 | #include <limits.h> | |
44 | #include <ctype.h> | |
45 | #include <stdio.h> | |
46 | #include <vis.h> | |
47 | ||
48 | #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') | |
49 | ||
50 | /* | |
51 | * vis - visually encode characters | |
52 | */ | |
53 | char * | |
54 | vis(dst, c, flag, nextc) | |
55 | char *dst; | |
56 | int c, nextc; | |
57 | int flag; | |
58 | { | |
59 | locale_t loc = __current_locale(); | |
60 | ||
61 | c = (unsigned char)c; | |
62 | ||
63 | if (flag & VIS_HTTPSTYLE) { | |
64 | /* Described in RFC 1808 */ | |
65 | if (!(isalnum_l(c, loc) /* alpha-numeric */ | |
66 | /* safe */ | |
67 | || c == '$' || c == '-' || c == '_' || c == '.' || c == '+' | |
68 | /* extra */ | |
69 | || c == '!' || c == '*' || c == '\'' || c == '(' | |
70 | || c == ')' || c == ',')) { | |
71 | *dst++ = '%'; | |
72 | snprintf_l(dst, 4, loc, (c < 16 ? "0%X" : "%X"), c); | |
73 | dst += 2; | |
74 | goto done; | |
75 | } | |
76 | } | |
77 | ||
78 | if ((flag & VIS_GLOB) && | |
79 | (c == '*' || c == '?' || c == '[' || c == '#')) | |
80 | ; | |
81 | else if (isgraph_l(c, loc) || | |
82 | ((flag & VIS_SP) == 0 && c == ' ') || | |
83 | ((flag & VIS_TAB) == 0 && c == '\t') || | |
84 | ((flag & VIS_NL) == 0 && c == '\n') || | |
85 | ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) { | |
86 | *dst++ = c; | |
87 | if (c == '\\' && (flag & VIS_NOSLASH) == 0) | |
88 | *dst++ = '\\'; | |
89 | *dst = '\0'; | |
90 | return (dst); | |
91 | } | |
92 | ||
93 | if (flag & VIS_CSTYLE) { | |
94 | switch(c) { | |
95 | case '\n': | |
96 | *dst++ = '\\'; | |
97 | *dst++ = 'n'; | |
98 | goto done; | |
99 | case '\r': | |
100 | *dst++ = '\\'; | |
101 | *dst++ = 'r'; | |
102 | goto done; | |
103 | case '\b': | |
104 | *dst++ = '\\'; | |
105 | *dst++ = 'b'; | |
106 | goto done; | |
107 | case '\a': | |
108 | *dst++ = '\\'; | |
109 | *dst++ = 'a'; | |
110 | goto done; | |
111 | case '\v': | |
112 | *dst++ = '\\'; | |
113 | *dst++ = 'v'; | |
114 | goto done; | |
115 | case '\t': | |
116 | *dst++ = '\\'; | |
117 | *dst++ = 't'; | |
118 | goto done; | |
119 | case '\f': | |
120 | *dst++ = '\\'; | |
121 | *dst++ = 'f'; | |
122 | goto done; | |
123 | case ' ': | |
124 | *dst++ = '\\'; | |
125 | *dst++ = 's'; | |
126 | goto done; | |
127 | case '\0': | |
128 | *dst++ = '\\'; | |
129 | *dst++ = '0'; | |
130 | if (isoctal(nextc)) { | |
131 | *dst++ = '0'; | |
132 | *dst++ = '0'; | |
133 | } | |
134 | goto done; | |
135 | } | |
136 | } | |
137 | if (((c & 0177) == ' ') || isgraph_l(c, loc) || (flag & VIS_OCTAL)) { | |
138 | *dst++ = '\\'; | |
139 | *dst++ = ((u_char)c >> 6 & 07) + '0'; | |
140 | *dst++ = ((u_char)c >> 3 & 07) + '0'; | |
141 | *dst++ = ((u_char)c & 07) + '0'; | |
142 | goto done; | |
143 | } | |
144 | if ((flag & VIS_NOSLASH) == 0) | |
145 | *dst++ = '\\'; | |
146 | if (c & 0200) { | |
147 | c &= 0177; | |
148 | *dst++ = 'M'; | |
149 | } | |
150 | if (iscntrl_l(c, loc)) { | |
151 | *dst++ = '^'; | |
152 | if (c == 0177) | |
153 | *dst++ = '?'; | |
154 | else | |
155 | *dst++ = c + '@'; | |
156 | } else { | |
157 | *dst++ = '-'; | |
158 | *dst++ = c; | |
159 | } | |
160 | done: | |
161 | *dst = '\0'; | |
162 | return (dst); | |
163 | } | |
164 | ||
165 | /* | |
166 | * strvis, strvisx - visually encode characters from src into dst | |
167 | * | |
168 | * Dst must be 4 times the size of src to account for possible | |
169 | * expansion. The length of dst, not including the trailing NUL, | |
170 | * is returned. | |
171 | * | |
172 | * Strvisx encodes exactly len bytes from src into dst. | |
173 | * This is useful for encoding a block of data. | |
174 | */ | |
175 | int | |
176 | strvis(dst, src, flag) | |
177 | char *dst; | |
178 | const char *src; | |
179 | int flag; | |
180 | { | |
181 | char c; | |
182 | char *start; | |
183 | ||
184 | for (start = dst; (c = *src); ) | |
185 | dst = vis(dst, c, flag, *++src); | |
186 | *dst = '\0'; | |
187 | return (dst - start); | |
188 | } | |
189 | ||
190 | int | |
191 | strvisx(dst, src, len, flag) | |
192 | char *dst; | |
193 | const char *src; | |
194 | size_t len; | |
195 | int flag; | |
196 | { | |
197 | int c; | |
198 | char *start; | |
199 | ||
200 | for (start = dst; len > 1; len--) { | |
201 | c = *src; | |
202 | dst = vis(dst, c, flag, *++src); | |
203 | } | |
204 | if (len) | |
205 | dst = vis(dst, *src, flag, '\0'); | |
206 | *dst = '\0'; | |
207 | ||
208 | return (dst - start); | |
209 | } |