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540d72c3 | 1 | /* OPENBSD ORIGINAL: lib/libc/gen/vis.c */ |
2 | ||
c20db291 | 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. | |
7cac2b65 | 15 | * 3. Neither the name of the University nor the names of its contributors |
c20db291 | 16 | * may be used to endorse or promote products derived from this software |
17 | * without specific prior written permission. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
29 | * SUCH DAMAGE. | |
30 | */ | |
7cac2b65 | 31 | #include "includes.h" |
c20db291 | 32 | #if !defined(HAVE_STRNVIS) |
33 | ||
34 | #if defined(LIBC_SCCS) && !defined(lint) | |
7cac2b65 | 35 | static char rcsid[] = "$OpenBSD: vis.c,v 1.12 2003/06/02 20:18:35 millert Exp $"; |
c20db291 | 36 | #endif /* LIBC_SCCS and not lint */ |
37 | ||
38 | #include <ctype.h> | |
7cac2b65 | 39 | #include <string.h> |
c20db291 | 40 | |
41 | #include "vis.h" | |
42 | ||
43 | #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') | |
44 | #define isvisible(c) (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \ | |
45 | isgraph((u_char)(c))) || \ | |
46 | ((flag & VIS_SP) == 0 && (c) == ' ') || \ | |
47 | ((flag & VIS_TAB) == 0 && (c) == '\t') || \ | |
48 | ((flag & VIS_NL) == 0 && (c) == '\n') || \ | |
7cac2b65 | 49 | ((flag & VIS_SAFE) && ((c) == '\b' || \ |
50 | (c) == '\007' || (c) == '\r' || \ | |
51 | isgraph((u_char)(c))))) | |
c20db291 | 52 | |
53 | /* | |
54 | * vis - visually encode characters | |
55 | */ | |
56 | char * | |
57 | vis(dst, c, flag, nextc) | |
58 | register char *dst; | |
59 | int c, nextc; | |
60 | register int flag; | |
61 | { | |
62 | if (isvisible(c)) { | |
63 | *dst++ = c; | |
64 | if (c == '\\' && (flag & VIS_NOSLASH) == 0) | |
65 | *dst++ = '\\'; | |
66 | *dst = '\0'; | |
67 | return (dst); | |
68 | } | |
69 | ||
70 | if (flag & VIS_CSTYLE) { | |
71 | switch(c) { | |
72 | case '\n': | |
73 | *dst++ = '\\'; | |
74 | *dst++ = 'n'; | |
75 | goto done; | |
76 | case '\r': | |
77 | *dst++ = '\\'; | |
78 | *dst++ = 'r'; | |
79 | goto done; | |
80 | case '\b': | |
81 | *dst++ = '\\'; | |
82 | *dst++ = 'b'; | |
83 | goto done; | |
84 | case '\a': | |
85 | *dst++ = '\\'; | |
86 | *dst++ = 'a'; | |
87 | goto done; | |
88 | case '\v': | |
89 | *dst++ = '\\'; | |
90 | *dst++ = 'v'; | |
91 | goto done; | |
92 | case '\t': | |
93 | *dst++ = '\\'; | |
94 | *dst++ = 't'; | |
95 | goto done; | |
96 | case '\f': | |
97 | *dst++ = '\\'; | |
98 | *dst++ = 'f'; | |
99 | goto done; | |
100 | case ' ': | |
101 | *dst++ = '\\'; | |
102 | *dst++ = 's'; | |
103 | goto done; | |
104 | case '\0': | |
105 | *dst++ = '\\'; | |
106 | *dst++ = '0'; | |
107 | if (isoctal(nextc)) { | |
108 | *dst++ = '0'; | |
109 | *dst++ = '0'; | |
110 | } | |
111 | goto done; | |
112 | } | |
113 | } | |
114 | if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) { | |
115 | *dst++ = '\\'; | |
116 | *dst++ = ((u_char)c >> 6 & 07) + '0'; | |
117 | *dst++ = ((u_char)c >> 3 & 07) + '0'; | |
118 | *dst++ = ((u_char)c & 07) + '0'; | |
119 | goto done; | |
120 | } | |
121 | if ((flag & VIS_NOSLASH) == 0) | |
122 | *dst++ = '\\'; | |
123 | if (c & 0200) { | |
124 | c &= 0177; | |
125 | *dst++ = 'M'; | |
126 | } | |
127 | if (iscntrl(c)) { | |
128 | *dst++ = '^'; | |
129 | if (c == 0177) | |
130 | *dst++ = '?'; | |
131 | else | |
132 | *dst++ = c + '@'; | |
133 | } else { | |
134 | *dst++ = '-'; | |
135 | *dst++ = c; | |
136 | } | |
137 | done: | |
138 | *dst = '\0'; | |
139 | return (dst); | |
140 | } | |
141 | ||
142 | /* | |
143 | * strvis, strnvis, strvisx - visually encode characters from src into dst | |
144 | * | |
145 | * Dst must be 4 times the size of src to account for possible | |
146 | * expansion. The length of dst, not including the trailing NULL, | |
147 | * is returned. | |
148 | * | |
149 | * Strnvis will write no more than siz-1 bytes (and will NULL terminate). | |
150 | * The number of bytes needed to fully encode the string is returned. | |
151 | * | |
152 | * Strvisx encodes exactly len bytes from src into dst. | |
153 | * This is useful for encoding a block of data. | |
154 | */ | |
155 | int | |
156 | strvis(dst, src, flag) | |
157 | register char *dst; | |
158 | register const char *src; | |
159 | int flag; | |
160 | { | |
161 | register char c; | |
162 | char *start; | |
163 | ||
164 | for (start = dst; (c = *src);) | |
165 | dst = vis(dst, c, flag, *++src); | |
166 | *dst = '\0'; | |
167 | return (dst - start); | |
168 | } | |
169 | ||
170 | int | |
171 | strnvis(dst, src, siz, flag) | |
7cac2b65 | 172 | char *dst; |
173 | const char *src; | |
c20db291 | 174 | size_t siz; |
175 | int flag; | |
176 | { | |
7cac2b65 | 177 | char c; |
c20db291 | 178 | char *start, *end; |
7cac2b65 | 179 | char tbuf[5]; |
180 | int i; | |
c20db291 | 181 | |
7cac2b65 | 182 | i = 0; |
c20db291 | 183 | for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) { |
184 | if (isvisible(c)) { | |
7cac2b65 | 185 | i = 1; |
c20db291 | 186 | *dst++ = c; |
187 | if (c == '\\' && (flag & VIS_NOSLASH) == 0) { | |
188 | /* need space for the extra '\\' */ | |
189 | if (dst < end) | |
190 | *dst++ = '\\'; | |
191 | else { | |
192 | dst--; | |
7cac2b65 | 193 | i = 2; |
c20db291 | 194 | break; |
195 | } | |
196 | } | |
197 | src++; | |
198 | } else { | |
7cac2b65 | 199 | i = vis(tbuf, c, flag, *++src) - tbuf; |
200 | if (dst + i <= end) { | |
201 | memcpy(dst, tbuf, i); | |
202 | dst += i; | |
203 | } else { | |
204 | src--; | |
c20db291 | 205 | break; |
7cac2b65 | 206 | } |
c20db291 | 207 | } |
208 | } | |
7cac2b65 | 209 | if (siz > 0) |
210 | *dst = '\0'; | |
211 | if (dst + i > end) { | |
c20db291 | 212 | /* adjust return value for truncation */ |
213 | while ((c = *src)) | |
214 | dst += vis(tbuf, c, flag, *++src) - tbuf; | |
215 | } | |
216 | return (dst - start); | |
217 | } | |
218 | ||
219 | int | |
220 | strvisx(dst, src, len, flag) | |
221 | register char *dst; | |
222 | register const char *src; | |
223 | register size_t len; | |
224 | int flag; | |
225 | { | |
226 | register char c; | |
227 | char *start; | |
228 | ||
229 | for (start = dst; len > 1; len--) { | |
230 | c = *src; | |
231 | dst = vis(dst, c, flag, *++src); | |
232 | } | |
233 | if (len) | |
234 | dst = vis(dst, *src, flag, '\0'); | |
235 | *dst = '\0'; | |
236 | return (dst - start); | |
237 | } | |
238 | ||
239 | #endif |