[821] | 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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