Mercurial > hg > toybox

annotate toys/other/blkid.c @ 1122:663242f2962c draft 0.4.7

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Add test suite for blkid and clean up an editorial comment that shouldn't have been checked in.
author Rob Landley <rob@landley.net>
date Mon, 18 Nov 2013 07:42:48 -0600
parents 162bb45b0387
children 5c51c9639a6f
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1086
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1 /* blkid.c - Prints type, label and UUID of filesystem(s).
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2 *
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3 * Copyright 2013 Brad Conroy <bconroy@uis.edu>
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4 *
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5 * See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
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6
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7 USE_BLKID(NEWTOY(blkid, "<1", TOYFLAG_BIN))
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8 USE_BLKID(OLDTOY(fstype, blkid, "<1", TOYFLAG_BIN))
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9
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10 config BLKID
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11 bool "blkid"
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12 default y
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13 help
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14 usage: blkid [block device...]
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15 Prints type, label and UUID of filesystem.
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16 */
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17
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18 #define FOR_blkid
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19 #include "toys.h"
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20
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21 struct fstype {
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22 char *name;
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23 uint64_t magic;
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24 int magic_len, magic_offset, uuid_off, label_len, label_off;
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25 };
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26
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27 static const struct fstype fstypes[] = {
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28 // ext3 = buf[1116]&4 ext4 = buf[1120]&64
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29 {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144},
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30 // label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
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31 // codepage, something called a uuid that's only 8 bytes long...
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32 {"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0},
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33
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34 {"adfs", 0xadf5, 2, 0xc00, 0,0,0},
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35 {"bfs", 0x1badface, 4, 0, 0,0,0},
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36 {"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819},
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37 {"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48},
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38 {"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110},
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39 {"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904},
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40 {"nilfs", 0x3434, 2, 1030, 1176, 80, 1192},
1122
663242f2962c Add test suite for blkid and clean up an editorial comment that shouldn't have been checked in.
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41 {"reiserfs", 0x724573496552, 6, 8244, 8276, 16, 8292},
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42 {"reiserfs", 0x724573496552, 6, 65588, 65620, 16, 65536},
1086
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43 {"romfs", 0x2d6d6f72, 4, 0, 0,0,0},
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44 {"squashfs", 0x73717368, 4, 0, 0,0,0},
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45 {"xiafs", 0x012fd16d, 4, 572, 0,0,0},
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46 {"xfs", 0x42534658, 4, 0, 32, 12, 108},
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47 {"vfat", 0x3233544146, 5, 82, 67+(4<<24), 11, 71}, // fat32
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48 {"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
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49 };
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50
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51 /* TODO if no args use proc/partitions */
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52 void do_blkid(int fd, char *name)
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53 {
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54 int off, i, j;
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55 char *type;
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56
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57 off = i = 0;
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58
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59 for (;;) {
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60 int pass = 0, len;
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61
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62 // Read next block of data
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63 len = readall(fd, toybuf, sizeof(toybuf));
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64 if (len != sizeof(toybuf)) return;
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65
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66 // Iterate through types in range
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67 for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) {
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68 uint64_t test;
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69
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70 // Skip tests not in this 4k block
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71 if (fstypes[i].magic_offset > off+sizeof(toybuf)) {
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72 pass++;
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73 continue;
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74 }
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75 if (fstypes[i].magic_offset < off) continue;
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76
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77 // Populate 64 bit little endian magic value
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78 test = 0;
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79 for (j = 0; j < fstypes[i].magic_len; j++)
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80 test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j);
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81 if (test == fstypes[i].magic) break;
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82 }
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83
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84 if (i == sizeof(fstypes)/sizeof(struct fstype)) {
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85 off += len;
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86 if (pass) continue;
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87 return;
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88 }
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89 break;
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90 }
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91
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92 // distinguish ext2/3/4
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93 type = fstypes[i].name;
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94 if (!i) {
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95 if (toybuf[1116]&4) type = "ext3";
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96 if (toybuf[1120]&64) type = "ext4";
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97 }
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98
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99 // Could special case NTFS here...
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100
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101 // Output for fstype
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102 if (*toys.which->name == 'f') {
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103 puts(type);
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104 return;
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105 }
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106
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107 // output for blkid
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108 printf("%s:",name);
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109
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110 if (fstypes[i].label_len)
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111 printf(" LABEL=\"%.*s\"", fstypes[i].label_len,
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112 toybuf+fstypes[i].label_off-off);
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113
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114 if (fstypes[i].uuid_off) {
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115 int bits = 0x550, size = fstypes[i].uuid_off >> 24,
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116 uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
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117
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118 if (size) bits = 4*(size == 4);
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119 else size = 16;
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120
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121 printf(" UUID=\"");
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122 for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
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123 printf("\"");
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124 }
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125
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126 printf(" TYPE=\"%s\"\n", fstypes[i].name);
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127 }
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128
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129 void blkid_main(void)
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130 {
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131 loopfiles(toys.optargs, do_blkid);
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132 }