[821] | 1 | /*
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| 2 | * feature.c --- convert between features and strings
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| 3 | *
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| 4 | * Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu>
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| 5 | *
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| 6 | * This file can be redistributed under the terms of the GNU Library General
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| 7 | * Public License
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | #include <stdio.h>
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| 12 | #include <stdlib.h>
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| 13 | #include <string.h>
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| 14 | #include <ctype.h>
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| 15 | #include <errno.h>
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| 16 |
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| 17 | #include "e2p.h"
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| 18 |
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| 19 | struct feature {
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| 20 | int compat;
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| 21 | unsigned int mask;
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| 22 | const char *string;
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| 23 | };
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| 24 |
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| 25 | static const struct feature feature_list[] = {
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| 26 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,
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| 27 | "dir_prealloc" },
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| 28 | { E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
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| 29 | "has_journal" },
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| 30 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
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| 31 | "imagic_inodes" },
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| 32 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,
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| 33 | "ext_attr" },
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| 34 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,
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| 35 | "dir_index" },
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| 36 | { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
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| 37 | "resize_inode" },
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| 38 | { E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
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| 39 | "sparse_super" },
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| 40 | { E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
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| 41 | "large_file" },
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| 42 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
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| 43 | "compression" },
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| 44 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
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| 45 | "filetype" },
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| 46 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
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| 47 | "needs_recovery" },
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| 48 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
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| 49 | "journal_dev" },
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| 50 | { E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
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| 51 | "extents" },
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| 52 | { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
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| 53 | "meta_bg" },
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| 54 | { 0, 0, 0 },
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| 55 | };
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| 56 |
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| 57 | const char *e2p_feature2string(int compat, unsigned int mask)
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| 58 | {
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| 59 | const struct feature *f;
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| 60 | static char buf[20];
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| 61 | char fchar;
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| 62 | int fnum;
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| 63 |
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| 64 | for (f = feature_list; f->string; f++) {
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| 65 | if ((compat == f->compat) &&
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| 66 | (mask == f->mask))
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| 67 | return f->string;
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| 68 | }
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| 69 | switch (compat) {
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| 70 | case E2P_FEATURE_COMPAT:
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| 71 | fchar = 'C';
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| 72 | break;
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| 73 | case E2P_FEATURE_INCOMPAT:
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| 74 | fchar = 'I';
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| 75 | break;
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| 76 | case E2P_FEATURE_RO_INCOMPAT:
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| 77 | fchar = 'R';
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| 78 | break;
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| 79 | default:
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| 80 | fchar = '?';
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| 81 | break;
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| 82 | }
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| 83 | for (fnum = 0; mask >>= 1; fnum++);
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| 84 | sprintf(buf, "FEATURE_%c%d", fchar, fnum);
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| 85 | return buf;
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| 86 | }
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| 87 |
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| 88 | int e2p_string2feature(char *string, int *compat_type, unsigned int *mask)
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| 89 | {
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| 90 | const struct feature *f;
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| 91 | char *eptr;
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| 92 | int num;
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| 93 |
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| 94 | for (f = feature_list; f->string; f++) {
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| 95 | if (!strcasecmp(string, f->string)) {
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| 96 | *compat_type = f->compat;
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| 97 | *mask = f->mask;
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| 98 | return 0;
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| 99 | }
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| 100 | }
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| 101 | if (strncasecmp(string, "FEATURE_", 8))
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| 102 | return 1;
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| 103 |
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| 104 | switch (string[8]) {
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| 105 | case 'c':
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| 106 | case 'C':
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| 107 | *compat_type = E2P_FEATURE_COMPAT;
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| 108 | break;
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| 109 | case 'i':
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| 110 | case 'I':
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| 111 | *compat_type = E2P_FEATURE_INCOMPAT;
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| 112 | break;
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| 113 | case 'r':
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| 114 | case 'R':
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| 115 | *compat_type = E2P_FEATURE_RO_INCOMPAT;
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| 116 | break;
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| 117 | default:
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| 118 | return 1;
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| 119 | }
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| 120 | if (string[9] == 0)
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| 121 | return 1;
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| 122 | num = strtol(string+9, &eptr, 10);
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| 123 | if (num > 32 || num < 0)
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| 124 | return 1;
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| 125 | if (*eptr)
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| 126 | return 1;
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| 127 | *mask = 1 << num;
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| 128 | return 0;
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| 129 | }
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| 130 |
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| 131 | static inline char *skip_over_blanks(char *cp)
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| 132 | {
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| 133 | while (*cp && isspace(*cp))
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| 134 | cp++;
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| 135 | return cp;
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| 136 | }
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| 137 |
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| 138 | static inline char *skip_over_word(char *cp)
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| 139 | {
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| 140 | while (*cp && !isspace(*cp) && *cp != ',')
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| 141 | cp++;
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| 142 | return cp;
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| 143 | }
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| 144 |
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| 145 | /*
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| 146 | * Edit a feature set array as requested by the user. The ok_array,
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| 147 | * if set, allows the application to limit what features the user is
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| 148 | * allowed to set or clear using this function.
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| 149 | */
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| 150 | int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
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| 151 | {
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| 152 | char *cp, *buf, *next;
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| 153 | int neg;
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| 154 | unsigned int mask;
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| 155 | int compat_type;
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| 156 |
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| 157 | buf = bb_xstrdup(str);
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| 158 | cp = buf;
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| 159 | while (cp && *cp) {
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| 160 | neg = 0;
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| 161 | cp = skip_over_blanks(cp);
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| 162 | next = skip_over_word(cp);
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| 163 | if (*next == 0)
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| 164 | next = 0;
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| 165 | else
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| 166 | *next = 0;
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| 167 | switch (*cp) {
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| 168 | case '-':
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| 169 | case '^':
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| 170 | neg++;
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| 171 | case '+':
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| 172 | cp++;
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| 173 | break;
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| 174 | }
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| 175 | if (e2p_string2feature(cp, &compat_type, &mask))
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| 176 | return 1;
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| 177 | if (ok_array && !(ok_array[compat_type] & mask))
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| 178 | return 1;
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| 179 | if (neg)
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| 180 | compat_array[compat_type] &= ~mask;
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| 181 | else
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| 182 | compat_array[compat_type] |= mask;
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| 183 | cp = next ? next+1 : 0;
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| 184 | }
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| 185 | return 0;
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| 186 | }
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