1 | /*
|
---|
2 | * feature.c --- convert between features and strings
|
---|
3 | *
|
---|
4 | * Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu>
|
---|
5 | *
|
---|
6 | * This file can be redistributed under the terms of the GNU Library General
|
---|
7 | * Public License
|
---|
8 | *
|
---|
9 | */
|
---|
10 |
|
---|
11 | #include <stdio.h>
|
---|
12 | #include <stdlib.h>
|
---|
13 | #include <string.h>
|
---|
14 | #include <ctype.h>
|
---|
15 | #include <errno.h>
|
---|
16 |
|
---|
17 | #include "e2p.h"
|
---|
18 |
|
---|
19 | struct feature {
|
---|
20 | int compat;
|
---|
21 | unsigned int mask;
|
---|
22 | const char *string;
|
---|
23 | };
|
---|
24 |
|
---|
25 | static const struct feature feature_list[] = {
|
---|
26 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,
|
---|
27 | "dir_prealloc" },
|
---|
28 | { E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
|
---|
29 | "has_journal" },
|
---|
30 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
|
---|
31 | "imagic_inodes" },
|
---|
32 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,
|
---|
33 | "ext_attr" },
|
---|
34 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,
|
---|
35 | "dir_index" },
|
---|
36 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
|
---|
37 | "resize_inode" },
|
---|
38 | { E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
|
---|
39 | "sparse_super" },
|
---|
40 | { E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
|
---|
41 | "large_file" },
|
---|
42 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
|
---|
43 | "compression" },
|
---|
44 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
|
---|
45 | "filetype" },
|
---|
46 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
|
---|
47 | "needs_recovery" },
|
---|
48 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
|
---|
49 | "journal_dev" },
|
---|
50 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
|
---|
51 | "extents" },
|
---|
52 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
|
---|
53 | "meta_bg" },
|
---|
54 | { 0, 0, 0 },
|
---|
55 | };
|
---|
56 |
|
---|
57 | const char *e2p_feature2string(int compat, unsigned int mask)
|
---|
58 | {
|
---|
59 | const struct feature *f;
|
---|
60 | static char buf[20];
|
---|
61 | char fchar;
|
---|
62 | int fnum;
|
---|
63 |
|
---|
64 | for (f = feature_list; f->string; f++) {
|
---|
65 | if ((compat == f->compat) &&
|
---|
66 | (mask == f->mask))
|
---|
67 | return f->string;
|
---|
68 | }
|
---|
69 | switch (compat) {
|
---|
70 | case E2P_FEATURE_COMPAT:
|
---|
71 | fchar = 'C';
|
---|
72 | break;
|
---|
73 | case E2P_FEATURE_INCOMPAT:
|
---|
74 | fchar = 'I';
|
---|
75 | break;
|
---|
76 | case E2P_FEATURE_RO_INCOMPAT:
|
---|
77 | fchar = 'R';
|
---|
78 | break;
|
---|
79 | default:
|
---|
80 | fchar = '?';
|
---|
81 | break;
|
---|
82 | }
|
---|
83 | for (fnum = 0; mask >>= 1; fnum++);
|
---|
84 | sprintf(buf, "FEATURE_%c%d", fchar, fnum);
|
---|
85 | return buf;
|
---|
86 | }
|
---|
87 |
|
---|
88 | int e2p_string2feature(char *string, int *compat_type, unsigned int *mask)
|
---|
89 | {
|
---|
90 | const struct feature *f;
|
---|
91 | char *eptr;
|
---|
92 | int num;
|
---|
93 |
|
---|
94 | for (f = feature_list; f->string; f++) {
|
---|
95 | if (!strcasecmp(string, f->string)) {
|
---|
96 | *compat_type = f->compat;
|
---|
97 | *mask = f->mask;
|
---|
98 | return 0;
|
---|
99 | }
|
---|
100 | }
|
---|
101 | if (strncasecmp(string, "FEATURE_", 8))
|
---|
102 | return 1;
|
---|
103 |
|
---|
104 | switch (string[8]) {
|
---|
105 | case 'c':
|
---|
106 | case 'C':
|
---|
107 | *compat_type = E2P_FEATURE_COMPAT;
|
---|
108 | break;
|
---|
109 | case 'i':
|
---|
110 | case 'I':
|
---|
111 | *compat_type = E2P_FEATURE_INCOMPAT;
|
---|
112 | break;
|
---|
113 | case 'r':
|
---|
114 | case 'R':
|
---|
115 | *compat_type = E2P_FEATURE_RO_INCOMPAT;
|
---|
116 | break;
|
---|
117 | default:
|
---|
118 | return 1;
|
---|
119 | }
|
---|
120 | if (string[9] == 0)
|
---|
121 | return 1;
|
---|
122 | num = strtol(string+9, &eptr, 10);
|
---|
123 | if (num > 32 || num < 0)
|
---|
124 | return 1;
|
---|
125 | if (*eptr)
|
---|
126 | return 1;
|
---|
127 | *mask = 1 << num;
|
---|
128 | return 0;
|
---|
129 | }
|
---|
130 |
|
---|
131 | static inline char *skip_over_blanks(char *cp)
|
---|
132 | {
|
---|
133 | while (*cp && isspace(*cp))
|
---|
134 | cp++;
|
---|
135 | return cp;
|
---|
136 | }
|
---|
137 |
|
---|
138 | static inline char *skip_over_word(char *cp)
|
---|
139 | {
|
---|
140 | while (*cp && !isspace(*cp) && *cp != ',')
|
---|
141 | cp++;
|
---|
142 | return cp;
|
---|
143 | }
|
---|
144 |
|
---|
145 | /*
|
---|
146 | * Edit a feature set array as requested by the user. The ok_array,
|
---|
147 | * if set, allows the application to limit what features the user is
|
---|
148 | * allowed to set or clear using this function.
|
---|
149 | */
|
---|
150 | int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
|
---|
151 | {
|
---|
152 | char *cp, *buf, *next;
|
---|
153 | int neg;
|
---|
154 | unsigned int mask;
|
---|
155 | int compat_type;
|
---|
156 |
|
---|
157 | buf = bb_xstrdup(str);
|
---|
158 | cp = buf;
|
---|
159 | while (cp && *cp) {
|
---|
160 | neg = 0;
|
---|
161 | cp = skip_over_blanks(cp);
|
---|
162 | next = skip_over_word(cp);
|
---|
163 | if (*next == 0)
|
---|
164 | next = 0;
|
---|
165 | else
|
---|
166 | *next = 0;
|
---|
167 | switch (*cp) {
|
---|
168 | case '-':
|
---|
169 | case '^':
|
---|
170 | neg++;
|
---|
171 | case '+':
|
---|
172 | cp++;
|
---|
173 | break;
|
---|
174 | }
|
---|
175 | if (e2p_string2feature(cp, &compat_type, &mask))
|
---|
176 | return 1;
|
---|
177 | if (ok_array && !(ok_array[compat_type] & mask))
|
---|
178 | return 1;
|
---|
179 | if (neg)
|
---|
180 | compat_array[compat_type] &= ~mask;
|
---|
181 | else
|
---|
182 | compat_array[compat_type] |= mask;
|
---|
183 | cp = next ? next+1 : 0;
|
---|
184 | }
|
---|
185 | return 0;
|
---|
186 | }
|
---|