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1.1 misho 1: /* $OpenBSD: vis.c,v 1.24 2015/07/20 01:52:28 millert Exp $ */
2: /*-
3: * Copyright (c) 1989, 1993
4: * The Regents of the University of California. All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. Neither the name of the University nor the names of its contributors
15: * may be used to endorse or promote products derived from this software
16: * without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28: * SUCH DAMAGE.
29: */
30:
31: #include <sys/types.h>
32: #include <errno.h>
33: #include <ctype.h>
34: #include <limits.h>
35: #include <string.h>
36: #include <stdlib.h>
37:
38: #include "compat.h"
39:
40: #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
41: #define isvisible(c,flag) \
42: (((c) == '\\' || (flag & VIS_ALL) == 0) && \
43: (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
44: (((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') || \
45: (flag & VIS_GLOB) == 0) && isgraph((u_char)(c))) || \
46: ((flag & VIS_SP) == 0 && (c) == ' ') || \
47: ((flag & VIS_TAB) == 0 && (c) == '\t') || \
48: ((flag & VIS_NL) == 0 && (c) == '\n') || \
49: ((flag & VIS_SAFE) && ((c) == '\b' || \
50: (c) == '\007' || (c) == '\r' || \
51: isgraph((u_char)(c))))))
52:
53: /*
54: * vis - visually encode characters
55: */
56: char *
57: vis(char *dst, int c, int flag, int nextc)
58: {
59: if (isvisible(c, flag)) {
60: if ((c == '"' && (flag & VIS_DQ) != 0) ||
61: (c == '\\' && (flag & VIS_NOSLASH) == 0))
62: *dst++ = '\\';
63: *dst++ = c;
64: *dst = '\0';
65: return (dst);
66: }
67:
68: if (flag & VIS_CSTYLE) {
69: switch(c) {
70: case '\n':
71: *dst++ = '\\';
72: *dst++ = 'n';
73: goto done;
74: case '\r':
75: *dst++ = '\\';
76: *dst++ = 'r';
77: goto done;
78: case '\b':
79: *dst++ = '\\';
80: *dst++ = 'b';
81: goto done;
82: case '\a':
83: *dst++ = '\\';
84: *dst++ = 'a';
85: goto done;
86: case '\v':
87: *dst++ = '\\';
88: *dst++ = 'v';
89: goto done;
90: case '\t':
91: *dst++ = '\\';
92: *dst++ = 't';
93: goto done;
94: case '\f':
95: *dst++ = '\\';
96: *dst++ = 'f';
97: goto done;
98: case ' ':
99: *dst++ = '\\';
100: *dst++ = 's';
101: goto done;
102: case '\0':
103: *dst++ = '\\';
104: *dst++ = '0';
105: if (isoctal(nextc)) {
106: *dst++ = '0';
107: *dst++ = '0';
108: }
109: goto done;
110: }
111: }
112: if (((c & 0177) == ' ') || (flag & VIS_OCTAL) ||
113: ((flag & VIS_GLOB) && (c == '*' || c == '?' || c == '[' || c == '#'))) {
114: *dst++ = '\\';
115: *dst++ = ((u_char)c >> 6 & 07) + '0';
116: *dst++ = ((u_char)c >> 3 & 07) + '0';
117: *dst++ = ((u_char)c & 07) + '0';
118: goto done;
119: }
120: if ((flag & VIS_NOSLASH) == 0)
121: *dst++ = '\\';
122: if (c & 0200) {
123: c &= 0177;
124: *dst++ = 'M';
125: }
126: if (iscntrl((u_char)c)) {
127: *dst++ = '^';
128: if (c == 0177)
129: *dst++ = '?';
130: else
131: *dst++ = c + '@';
132: } else {
133: *dst++ = '-';
134: *dst++ = c;
135: }
136: done:
137: *dst = '\0';
138: return (dst);
139: }
140:
141: /*
142: * strvis, strnvis, strvisx - visually encode characters from src into dst
143: *
144: * Dst must be 4 times the size of src to account for possible
145: * expansion. The length of dst, not including the trailing NULL,
146: * is returned.
147: *
148: * Strnvis will write no more than siz-1 bytes (and will NULL terminate).
149: * The number of bytes needed to fully encode the string is returned.
150: *
151: * Strvisx encodes exactly len bytes from src into dst.
152: * This is useful for encoding a block of data.
153: */
154: int
155: strvis(char *dst, const char *src, int flag)
156: {
157: char c;
158: char *start;
159:
160: for (start = dst; (c = *src);)
161: dst = vis(dst, c, flag, *++src);
162: *dst = '\0';
163: return (dst - start);
164: }
165:
166: int
167: strnvis(char *dst, const char *src, size_t siz, int flag)
168: {
169: char *start, *end;
170: char tbuf[5];
171: int c, i;
172:
173: i = 0;
174: for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
175: if (isvisible(c, flag)) {
176: if ((c == '"' && (flag & VIS_DQ) != 0) ||
177: (c == '\\' && (flag & VIS_NOSLASH) == 0)) {
178: /* need space for the extra '\\' */
179: if (dst + 1 >= end) {
180: i = 2;
181: break;
182: }
183: *dst++ = '\\';
184: }
185: i = 1;
186: *dst++ = c;
187: src++;
188: } else {
189: i = vis(tbuf, c, flag, *++src) - tbuf;
190: if (dst + i <= end) {
191: memcpy(dst, tbuf, i);
192: dst += i;
193: } else {
194: src--;
195: break;
196: }
197: }
198: }
199: if (siz > 0)
200: *dst = '\0';
201: if (dst + i > end) {
202: /* adjust return value for truncation */
203: while ((c = *src))
204: dst += vis(tbuf, c, flag, *++src) - tbuf;
205: }
206: return (dst - start);
207: }
208:
209: int
210: stravis(char **outp, const char *src, int flag)
211: {
212: char *buf;
213: int len, serrno;
214:
215: buf = calloc(4, strlen(src) + 1);
216: if (buf == NULL)
217: return -1;
218: len = strvis(buf, src, flag);
219: serrno = errno;
220: *outp = realloc(buf, len + 1);
221: if (*outp == NULL) {
222: *outp = buf;
223: errno = serrno;
224: }
225: return (len);
226: }
227:
228: int
229: strvisx(char *dst, const char *src, size_t len, int flag)
230: {
231: char c;
232: char *start;
233:
234: for (start = dst; len > 1; len--) {
235: c = *src;
236: dst = vis(dst, c, flag, *++src);
237: }
238: if (len)
239: dst = vis(dst, *src, flag, '\0');
240: *dst = '\0';
241: return (dst - start);
242: }