strtofflags.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 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.
15 * 4. 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.
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 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)stat_flags.c	8.1 (Berkeley) 5/31/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/lib/libc/gen/strtofflags.c 330897 2018-03-14 03:19:51Z eadler $");
37
38#include <sys/types.h>
39#include <sys/stat.h>
40
41#include <stddef.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45
46#define longestflaglen	12
47static struct {
48	char name[longestflaglen + 1];
49	char invert;
50	u_long flag;
51} const mapping[] = {
52	/* shorter names per flag first, all prefixed by "no" */
53	{ "nosappnd",		0, SF_APPEND	},
54	{ "nosappend",		0, SF_APPEND	},
55	{ "noarch",		0, SF_ARCHIVED	},
56	{ "noarchived",		0, SF_ARCHIVED	},
57	{ "noschg",		0, SF_IMMUTABLE	},
58	{ "noschange",		0, SF_IMMUTABLE	},
59	{ "nosimmutable",	0, SF_IMMUTABLE	},
60	{ "nosunlnk",		0, SF_NOUNLINK	},
61	{ "nosunlink",		0, SF_NOUNLINK	},
62#ifdef SF_SNAPSHOT
63	{ "nosnapshot",		0, SF_SNAPSHOT	},
64#endif
65	{ "nouappnd",		0, UF_APPEND	},
66	{ "nouappend",		0, UF_APPEND	},
67	{ "nouarch", 		0, UF_ARCHIVE	},
68	{ "nouarchive",		0, UF_ARCHIVE	},
69	{ "nohidden",		0, UF_HIDDEN	},
70	{ "nouhidden",		0, UF_HIDDEN	},
71	{ "nouchg",		0, UF_IMMUTABLE	},
72	{ "nouchange",		0, UF_IMMUTABLE	},
73	{ "nouimmutable",	0, UF_IMMUTABLE	},
74	{ "nodump",		1, UF_NODUMP	},
75	{ "nouunlnk",		0, UF_NOUNLINK	},
76	{ "nouunlink",		0, UF_NOUNLINK	},
77	{ "nooffline",		0, UF_OFFLINE	},
78	{ "nouoffline",		0, UF_OFFLINE	},
79	{ "noopaque",		0, UF_OPAQUE	},
80	{ "nordonly",		0, UF_READONLY	},
81	{ "nourdonly",		0, UF_READONLY	},
82	{ "noreadonly",		0, UF_READONLY	},
83	{ "noureadonly",	0, UF_READONLY	},
84	{ "noreparse",		0, UF_REPARSE	},
85	{ "noureparse",		0, UF_REPARSE	},
86	{ "nosparse",		0, UF_SPARSE	},
87	{ "nousparse",		0, UF_SPARSE	},
88	{ "nosystem",		0, UF_SYSTEM	},
89	{ "nousystem",		0, UF_SYSTEM	}
90};
91#define nmappings	(sizeof(mapping) / sizeof(mapping[0]))
92
93/*
94 * fflagstostr --
95 *	Convert file flags to a comma-separated string.  If no flags
96 *	are set, return the empty string.
97 */
98char *
99fflagstostr(u_long flags)
100{
101	char *string;
102	const char *sp;
103	char *dp;
104	u_long setflags;
105	u_int i;
106
107	if ((string = (char *)malloc(nmappings * (longestflaglen + 1))) == NULL)
108		return (NULL);
109
110	setflags = flags;
111	dp = string;
112	for (i = 0; i < nmappings; i++) {
113		if (setflags & mapping[i].flag) {
114			if (dp > string)
115				*dp++ = ',';
116			for (sp = mapping[i].invert ? mapping[i].name :
117			    mapping[i].name + 2; *sp; *dp++ = *sp++) ;
118			setflags &= ~mapping[i].flag;
119		}
120	}
121	*dp = '\0';
122	return (string);
123}
124
125/*
126 * strtofflags --
127 *	Take string of arguments and return file flags.  Return 0 on
128 *	success, 1 on failure.  On failure, stringp is set to point
129 *	to the offending token.
130 */
131int
132strtofflags(char **stringp, u_long *setp, u_long *clrp)
133{
134	char *string, *p;
135	int i;
136
137	if (setp)
138		*setp = 0;
139	if (clrp)
140		*clrp = 0;
141	string = *stringp;
142	while ((p = strsep(&string, "\t ,")) != NULL) {
143		*stringp = p;
144		if (*p == '\0')
145			continue;
146		for (i = 0; i < nmappings; i++) {
147			if (strcmp(p, mapping[i].name + 2) == 0) {
148				if (mapping[i].invert) {
149					if (clrp)
150						*clrp |= mapping[i].flag;
151				} else {
152					if (setp)
153						*setp |= mapping[i].flag;
154				}
155				break;
156			} else if (strcmp(p, mapping[i].name) == 0) {
157				if (mapping[i].invert) {
158					if (setp)
159						*setp |= mapping[i].flag;
160				} else {
161					if (clrp)
162						*clrp |= mapping[i].flag;
163				}
164				break;
165			}
166		}
167		if (i == nmappings)
168			return 1;
169	}
170	return 0;
171}
172