aboutsummaryrefslogtreecommitdiff
path: root/toys/other/blkid.c
diff options
context:
space:
mode:
Diffstat (limited to 'toys/other/blkid.c')
-rw-r--r--toys/other/blkid.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/toys/other/blkid.c b/toys/other/blkid.c
new file mode 100644
index 00000000..99d6999a
--- /dev/null
+++ b/toys/other/blkid.c
@@ -0,0 +1,132 @@
+/* blkid.c - Prints type, label and UUID of filesystem(s).
+ *
+ * Copyright 2013 Brad Conroy <bconroy@uis.edu>
+ *
+ * See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
+
+USE_BLKID(NEWTOY(blkid, "<1", TOYFLAG_BIN))
+USE_BLKID(OLDTOY(fstype, blkid, "<1", TOYFLAG_BIN))
+
+config BLKID
+ bool "blkid"
+ default y
+ help
+ usage: blkid [block device...]
+ Prints type, label and UUID of filesystem.
+*/
+
+#define FOR_blkid
+#include "toys.h"
+
+struct fstype {
+ char *name;
+ uint64_t magic;
+ int magic_len, magic_offset, uuid_off, label_len, label_off;
+};
+
+static const struct fstype fstypes[] = {
+ // ext3 = buf[1116]&4 ext4 = buf[1120]&64
+ {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144},
+ // label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
+ // codepage, something called a uuid that's only 8 bytes long...
+ {"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0},
+
+ {"adfs", 0xadf5, 2, 0xc00, 0,0,0},
+ {"bfs", 0x1badface, 4, 0, 0,0,0},
+ {"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819},
+ {"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48},
+ {"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110},
+ {"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904},
+ {"nilfs", 0x3434, 2, 1030, 1176, 80, 1192},
+ {"murderfs", 0x724573496552, 6, 8244, 8276, 16, 8292},
+ {"murderfs", 0x724573496552, 6, 65588, 65620, 16, 65536},
+ {"romfs", 0x2d6d6f72, 4, 0, 0,0,0},
+ {"squashfs", 0x73717368, 4, 0, 0,0,0},
+ {"xiafs", 0x012fd16d, 4, 572, 0,0,0},
+ {"xfs", 0x42534658, 4, 0, 32, 12, 108},
+ {"vfat", 0x3233544146, 5, 82, 67+(4<<24), 11, 71}, // fat32
+ {"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
+};
+
+/* TODO if no args use proc/partitions */
+void do_blkid(int fd, char *name)
+{
+ int off, i, j;
+ char *type;
+
+ off = i = 0;
+
+ for (;;) {
+ int pass = 0, len;
+
+ // Read next block of data
+ len = readall(fd, toybuf, sizeof(toybuf));
+ if (len != sizeof(toybuf)) return;
+
+ // Iterate through types in range
+ for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) {
+ uint64_t test;
+
+ // Skip tests not in this 4k block
+ if (fstypes[i].magic_offset > off+sizeof(toybuf)) {
+ pass++;
+ continue;
+ }
+ if (fstypes[i].magic_offset < off) continue;
+
+ // Populate 64 bit little endian magic value
+ test = 0;
+ for (j = 0; j < fstypes[i].magic_len; j++)
+ test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j);
+ if (test == fstypes[i].magic) break;
+ }
+
+ if (i == sizeof(fstypes)/sizeof(struct fstype)) {
+ off += len;
+ if (pass) continue;
+ return;
+ }
+ break;
+ }
+
+ // distinguish ext2/3/4
+ type = fstypes[i].name;
+ if (!i) {
+ if (toybuf[1116]&4) type = "ext3";
+ if (toybuf[1120]&64) type = "ext4";
+ }
+
+ // Could special case NTFS here...
+
+ // Output for fstype
+ if (*toys.which->name == 'f') {
+ puts(type);
+ return;
+ }
+
+ // output for blkid
+ printf("%s:",name);
+
+ if (fstypes[i].label_len)
+ printf(" LABEL=\"%.*s\"", fstypes[i].label_len,
+ toybuf+fstypes[i].label_off-off);
+
+ if (fstypes[i].uuid_off) {
+ int bits = 0x550, size = fstypes[i].uuid_off >> 24,
+ uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
+
+ if (size) bits = 4*(size == 4);
+ else size = 16;
+
+ printf(" UUID=\"");
+ for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
+ printf("\"");
+ }
+
+ printf(" TYPE=\"%s\"\n", fstypes[i].name);
+}
+
+void blkid_main(void)
+{
+ loopfiles(toys.optargs, do_blkid);
+}