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Diffstat (limited to 'e2fsprogs/e2p/feature.c')
-rw-r--r-- | e2fsprogs/e2p/feature.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/e2fsprogs/e2p/feature.c b/e2fsprogs/e2p/feature.c new file mode 100644 index 000000000..b45754f97 --- /dev/null +++ b/e2fsprogs/e2p/feature.c | |||
@@ -0,0 +1,187 @@ | |||
1 | /* vi: set sw=4 ts=4: */ | ||
2 | /* | ||
3 | * feature.c --- convert between features and strings | ||
4 | * | ||
5 | * Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu> | ||
6 | * | ||
7 | * This file can be redistributed under the terms of the GNU Library General | ||
8 | * Public License | ||
9 | * | ||
10 | */ | ||
11 | |||
12 | #include <stdio.h> | ||
13 | #include <stdlib.h> | ||
14 | #include <string.h> | ||
15 | #include <ctype.h> | ||
16 | #include <errno.h> | ||
17 | |||
18 | #include "e2p.h" | ||
19 | |||
20 | struct feature { | ||
21 | int compat; | ||
22 | unsigned int mask; | ||
23 | const char *string; | ||
24 | }; | ||
25 | |||
26 | static const struct feature feature_list[] = { | ||
27 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC, | ||
28 | "dir_prealloc" }, | ||
29 | { E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL, | ||
30 | "has_journal" }, | ||
31 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES, | ||
32 | "imagic_inodes" }, | ||
33 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR, | ||
34 | "ext_attr" }, | ||
35 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX, | ||
36 | "dir_index" }, | ||
37 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE, | ||
38 | "resize_inode" }, | ||
39 | { E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER, | ||
40 | "sparse_super" }, | ||
41 | { E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE, | ||
42 | "large_file" }, | ||
43 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION, | ||
44 | "compression" }, | ||
45 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE, | ||
46 | "filetype" }, | ||
47 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER, | ||
48 | "needs_recovery" }, | ||
49 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV, | ||
50 | "journal_dev" }, | ||
51 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS, | ||
52 | "extents" }, | ||
53 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG, | ||
54 | "meta_bg" }, | ||
55 | { 0, 0, 0 }, | ||
56 | }; | ||
57 | |||
58 | const char *e2p_feature2string(int compat, unsigned int mask) | ||
59 | { | ||
60 | const struct feature *f; | ||
61 | static char buf[20]; | ||
62 | char fchar; | ||
63 | int fnum; | ||
64 | |||
65 | for (f = feature_list; f->string; f++) { | ||
66 | if ((compat == f->compat) && | ||
67 | (mask == f->mask)) | ||
68 | return f->string; | ||
69 | } | ||
70 | switch (compat) { | ||
71 | case E2P_FEATURE_COMPAT: | ||
72 | fchar = 'C'; | ||
73 | break; | ||
74 | case E2P_FEATURE_INCOMPAT: | ||
75 | fchar = 'I'; | ||
76 | break; | ||
77 | case E2P_FEATURE_RO_INCOMPAT: | ||
78 | fchar = 'R'; | ||
79 | break; | ||
80 | default: | ||
81 | fchar = '?'; | ||
82 | break; | ||
83 | } | ||
84 | for (fnum = 0; mask >>= 1; fnum++); | ||
85 | sprintf(buf, "FEATURE_%c%d", fchar, fnum); | ||
86 | return buf; | ||
87 | } | ||
88 | |||
89 | int e2p_string2feature(char *string, int *compat_type, unsigned int *mask) | ||
90 | { | ||
91 | const struct feature *f; | ||
92 | char *eptr; | ||
93 | int num; | ||
94 | |||
95 | for (f = feature_list; f->string; f++) { | ||
96 | if (!strcasecmp(string, f->string)) { | ||
97 | *compat_type = f->compat; | ||
98 | *mask = f->mask; | ||
99 | return 0; | ||
100 | } | ||
101 | } | ||
102 | if (strncasecmp(string, "FEATURE_", 8)) | ||
103 | return 1; | ||
104 | |||
105 | switch (string[8]) { | ||
106 | case 'c': | ||
107 | case 'C': | ||
108 | *compat_type = E2P_FEATURE_COMPAT; | ||
109 | break; | ||
110 | case 'i': | ||
111 | case 'I': | ||
112 | *compat_type = E2P_FEATURE_INCOMPAT; | ||
113 | break; | ||
114 | case 'r': | ||
115 | case 'R': | ||
116 | *compat_type = E2P_FEATURE_RO_INCOMPAT; | ||
117 | break; | ||
118 | default: | ||
119 | return 1; | ||
120 | } | ||
121 | if (string[9] == 0) | ||
122 | return 1; | ||
123 | num = strtol(string+9, &eptr, 10); | ||
124 | if (num > 32 || num < 0) | ||
125 | return 1; | ||
126 | if (*eptr) | ||
127 | return 1; | ||
128 | *mask = 1 << num; | ||
129 | return 0; | ||
130 | } | ||
131 | |||
132 | static inline char *skip_over_blanks(char *cp) | ||
133 | { | ||
134 | while (*cp && isspace(*cp)) | ||
135 | cp++; | ||
136 | return cp; | ||
137 | } | ||
138 | |||
139 | static inline char *skip_over_word(char *cp) | ||
140 | { | ||
141 | while (*cp && !isspace(*cp) && *cp != ',') | ||
142 | cp++; | ||
143 | return cp; | ||
144 | } | ||
145 | |||
146 | /* | ||
147 | * Edit a feature set array as requested by the user. The ok_array, | ||
148 | * if set, allows the application to limit what features the user is | ||
149 | * allowed to set or clear using this function. | ||
150 | */ | ||
151 | int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array) | ||
152 | { | ||
153 | char *cp, *buf, *next; | ||
154 | int neg; | ||
155 | unsigned int mask; | ||
156 | int compat_type; | ||
157 | |||
158 | buf = xstrdup(str); | ||
159 | cp = buf; | ||
160 | while (cp && *cp) { | ||
161 | neg = 0; | ||
162 | cp = skip_over_blanks(cp); | ||
163 | next = skip_over_word(cp); | ||
164 | if (*next == 0) | ||
165 | next = 0; | ||
166 | else | ||
167 | *next = 0; | ||
168 | switch (*cp) { | ||
169 | case '-': | ||
170 | case '^': | ||
171 | neg++; | ||
172 | case '+': | ||
173 | cp++; | ||
174 | break; | ||
175 | } | ||
176 | if (e2p_string2feature(cp, &compat_type, &mask)) | ||
177 | return 1; | ||
178 | if (ok_array && !(ok_array[compat_type] & mask)) | ||
179 | return 1; | ||
180 | if (neg) | ||
181 | compat_array[compat_type] &= ~mask; | ||
182 | else | ||
183 | compat_array[compat_type] |= mask; | ||
184 | cp = next ? next+1 : 0; | ||
185 | } | ||
186 | return 0; | ||
187 | } | ||