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