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