1 /* $NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $ */
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
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
36 #define _DIAGASSERT(X)
39 #include <sys/cdefs.h>
40 #if defined(LIBC_SCCS) && !defined(lint)
42 static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93";
44 __RCSID("$NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $");
46 #endif /* LIBC_SCCS and not lint */
48 #define __LIBC12_SOURCE__
50 #include "namespace.h"
52 #include <sys/types.h>
61 __weak_alias(strunvis,_strunvis)
62 __weak_alias(unvis,_unvis)
65 __warn_references(unvis,
66 "warning: reference to compatibility unvis(); include <vis.h> for correct reference")
70 * decode driven by state machine
72 #define S_GROUND 0 /* haven't seen escape char */
73 #define S_START 1 /* start decoding special sequence */
74 #define S_META 2 /* metachar started (M) */
75 #define S_META1 3 /* metachar more, regular char (-) */
76 #define S_CTRL 4 /* control char started (^) */
77 #define S_OCTAL2 5 /* octal digit 2 */
78 #define S_OCTAL3 6 /* octal digit 3 */
80 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
82 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
83 rk_strunvis (char *, const char *);
84 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
85 rk_unvis (char *, int, int *, int);
88 * unvis - decode characters previously encoded by vis
91 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
92 rk_unvis(char *cp, int c, int *astate, int flag)
95 _DIAGASSERT(cp != NULL);
96 _DIAGASSERT(astate != NULL);
98 if (flag & UNVIS_END) {
99 if (*astate == S_OCTAL2 || *astate == S_OCTAL3) {
101 return (UNVIS_VALID);
103 return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
115 return (UNVIS_VALID);
122 return (UNVIS_VALID);
123 case '0': case '1': case '2': case '3':
124 case '4': case '5': case '6': case '7':
138 return (UNVIS_VALID);
142 return (UNVIS_VALID);
146 return (UNVIS_VALID);
150 return (UNVIS_VALID);
154 return (UNVIS_VALID);
158 return (UNVIS_VALID);
162 return (UNVIS_VALID);
166 return (UNVIS_VALID);
170 return (UNVIS_VALID);
176 return (UNVIS_NOCHAR);
182 return (UNVIS_NOCHAR);
185 return (UNVIS_SYNBAD);
194 return (UNVIS_SYNBAD);
201 return (UNVIS_VALID);
209 return (UNVIS_VALID);
211 case S_OCTAL2: /* second possible octal digit */
214 * yes - and maybe a third
216 *cp = (*cp << 3) + (c - '0');
221 * no - done with current sequence, push back passed char
224 return (UNVIS_VALIDPUSH);
226 case S_OCTAL3: /* third possible octal digit */
229 *cp = (*cp << 3) + (c - '0');
230 return (UNVIS_VALID);
233 * we were done, push back passed char
235 return (UNVIS_VALIDPUSH);
239 * decoder in unknown state - (probably uninitialized)
242 return (UNVIS_SYNBAD);
247 * strunvis - decode src into dst
249 * Number of chars decoded into dst is returned, -1 on error.
250 * Dst is null terminated.
253 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
254 rk_strunvis(char *dst, const char *src)
260 _DIAGASSERT(src != NULL);
261 _DIAGASSERT(dst != NULL);
263 while ((c = *src++) != '\0') {
265 switch (rk_unvis(dst, (unsigned char)c, &state, 0)) {
269 case UNVIS_VALIDPUSH:
279 if (unvis(dst, (unsigned char)c, &state, UNVIS_END) == UNVIS_VALID)
282 return (dst - start);