strtofflags.c revision 94831 
1/*-
2 * Copyright (c) 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)
35static char sccsid[] = "@(#)stat_flags.c	8.1 (Berkeley) 5/31/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/gen/strtofflags.c 94831 2002-04-16 11:03:22Z joe $");
39
40#include <sys/types.h>
41#include <sys/stat.h>
42
43#include <stddef.h>
44#include <stdlib.h>
45#include <string.h>
46
47static struct {
48	char *name;
49	u_long flag;
50	int invert;
51} mapping[] = {
52	/* shorter names per flag first, all prefixed by "no" */
53	{ "nosappnd",		SF_APPEND,	0 },
54	{ "nosappend",		SF_APPEND,	0 },
55	{ "noarch",		SF_ARCHIVED,	0 },
56	{ "noarchived",		SF_ARCHIVED,	0 },
57	{ "noschg",		SF_IMMUTABLE,	0 },
58	{ "noschange",		SF_IMMUTABLE,	0 },
59	{ "nosimmutable",	SF_IMMUTABLE,	0 },
60	{ "nosunlnk",		SF_NOUNLINK,	0 },
61	{ "nosunlink",		SF_NOUNLINK,	0 },
62#ifdef SF_SNAPSHOT
63	{ "nosnapshot",		SF_SNAPSHOT,	0 },
64#endif
65	{ "nouappnd",		UF_APPEND,	0 },
66	{ "nouappend",		UF_APPEND,	0 },
67	{ "nouchg",		UF_IMMUTABLE,	0 },
68	{ "nouchange",		UF_IMMUTABLE,	0 },
69	{ "nouimmutable",	UF_IMMUTABLE,	0 },
70	{ "nodump",		UF_NODUMP,	1 },
71	{ "noopaque",		UF_OPAQUE,	0 },
72	{ "nouunlnk",		UF_NOUNLINK,	0 },
73	{ "nouunlink",		UF_NOUNLINK,	0 }
74};
75#define longestflaglen	12
76#define nmappings	(sizeof(mapping) / sizeof(mapping[0]))
77
78/*
79 * fflagstostr --
80 *	Convert file flags to a comma-separated string.  If no flags
81 *	are set, return the empty string.
82 */
83char *
84fflagstostr(flags)
85	u_long flags;
86{
87	char *string;
88	char *sp, *dp;
89	u_long setflags;
90	int i;
91
92	if ((string = (char *)malloc(nmappings * (longestflaglen + 1))) == NULL)
93		return (NULL);
94
95	setflags = flags;
96	dp = string;
97	for (i = 0; i < nmappings; i++) {
98		if (setflags & mapping[i].flag) {
99			if (dp > string)
100				*dp++ = ',';
101			for (sp = mapping[i].invert ? mapping[i].name :
102			    mapping[i].name + 2; *sp; *dp++ = *sp++) ;
103			setflags &= ~mapping[i].flag;
104		}
105	}
106	*dp = '\0';
107	return (string);
108}
109
110/*
111 * strtofflags --
112 *	Take string of arguments and return file flags.  Return 0 on
113 *	success, 1 on failure.  On failure, stringp is set to point
114 *	to the offending token.
115 */
116int
117strtofflags(stringp, setp, clrp)
118	char **stringp;
119	u_long *setp, *clrp;
120{
121	char *string, *p;
122	int i;
123
124	if (setp)
125		*setp = 0;
126	if (clrp)
127		*clrp = 0;
128	string = *stringp;
129	while ((p = strsep(&string, "\t ,")) != NULL) {
130		*stringp = p;
131		if (*p == '\0')
132			continue;
133		for (i = 0; i < nmappings; i++) {
134			if (strcmp(p, mapping[i].name + 2) == 0) {
135				if (mapping[i].invert) {
136					if (clrp)
137						*clrp |= mapping[i].flag;
138				} else {
139					if (setp)
140						*setp |= mapping[i].flag;
141				}
142				break;
143			} else if (strcmp(p, mapping[i].name) == 0) {
144				if (mapping[i].invert) {
145					if (setp)
146						*setp |= mapping[i].flag;
147				} else {
148					if (clrp)
149						*clrp |= mapping[i].flag;
150				}
151				break;
152			}
153		}
154		if (i == nmappings)
155			return 1;
156	}
157	return 0;
158}
159