1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/* vi: set sw=4 ts=4: */
/*
* mountopts.c --- convert between default mount options and strings
*
* Copyright (C) 2002 Theodore Ts'o <tytso@mit.edu>
*
* This file can be redistributed under the terms of the GNU Library General
* Public License
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "e2p.h"
struct mntopt {
unsigned int mask;
const char *string;
};
static const struct mntopt mntopt_list[] = {
{ EXT2_DEFM_DEBUG, "debug" },
{ EXT2_DEFM_BSDGROUPS, "bsdgroups" },
{ EXT2_DEFM_XATTR_USER, "user_xattr" },
{ EXT2_DEFM_ACL, "acl" },
{ EXT2_DEFM_UID16, "uid16" },
{ EXT3_DEFM_JMODE_DATA, "journal_data" },
{ EXT3_DEFM_JMODE_ORDERED, "journal_data_ordered" },
{ EXT3_DEFM_JMODE_WBACK, "journal_data_writeback" },
{ 0, 0 },
};
const char *e2p_mntopt2string(unsigned int mask)
{
const struct mntopt *f;
static char buf[20];
int fnum;
for (f = mntopt_list; f->string; f++) {
if (mask == f->mask)
return f->string;
}
for (fnum = 0; mask >>= 1; fnum++);
sprintf(buf, "MNTOPT_%d", fnum);
return buf;
}
int e2p_string2mntopt(char *string, unsigned int *mask)
{
const struct mntopt *f;
char *eptr;
int num;
for (f = mntopt_list; f->string; f++) {
if (!strcasecmp(string, f->string)) {
*mask = f->mask;
return 0;
}
}
if (strncasecmp(string, "MNTOPT_", 8))
return 1;
if (string[8] == 0)
return 1;
num = strtol(string+8, &eptr, 10);
if (num > 32 || num < 0)
return 1;
if (*eptr)
return 1;
*mask = 1 << num;
return 0;
}
static char *skip_over_blanks(char *cp)
{
while (*cp && isspace(*cp))
cp++;
return cp;
}
static char *skip_over_word(char *cp)
{
while (*cp && !isspace(*cp) && *cp != ',')
cp++;
return cp;
}
/*
* Edit a mntopt set array as requested by the user. The ok
* parameter, if non-zero, allows the application to limit what
* mntopts the user is allowed to set or clear using this function.
*/
int e2p_edit_mntopts(const char *str, __u32 *mntopts, __u32 ok)
{
char *cp, *buf, *next;
int neg;
unsigned int mask;
buf = bb_xstrdup(str);
cp = buf;
while (cp && *cp) {
neg = 0;
cp = skip_over_blanks(cp);
next = skip_over_word(cp);
if (*next == 0)
next = 0;
else
*next = 0;
switch (*cp) {
case '-':
case '^':
neg++;
case '+':
cp++;
break;
}
if (e2p_string2mntopt(cp, &mask))
return 1;
if (ok && !(ok & mask))
return 1;
if (mask & EXT3_DEFM_JMODE)
*mntopts &= ~EXT3_DEFM_JMODE;
if (neg)
*mntopts &= ~mask;
else
*mntopts |= mask;
cp = next ? next+1 : 0;
}
return 0;
}
|
