projects / thirdparty / e2fsprogs.git / blame
| Commit | Line | Data |
|---|---|---|
| 1e3472c5 TT |
1 | /* |
| 2 | * uuid.c -- utility routines for manipulating UUID's. | |
| 3 | */ | |
| 4 | ||
| 5 | #include <stdio.h> | |
| 21c84b71 | 6 | #include <string.h> |
| 1e3472c5 TT |
7 | #include <linux/types.h> |
| 8 | ||
| 21c84b71 TT |
9 | #include "e2p.h" |
| 10 | ||
| 1e3472c5 TT |
11 | struct uuid { |
| 12 | __u32 time_low; | |
| 13 | __u16 time_mid; | |
| 14 | __u16 time_hi_and_version; | |
| 15 | __u16 clock_seq; | |
| 16 | __u8 node[6]; | |
| 17 | }; | |
| 18 | ||
| 19 | /* Returns 1 if the uuid is the NULL uuid */ | |
| 20 | int e2p_is_null_uuid(void *uu) | |
| 21 | { | |
| 22 | __u8 *cp; | |
| 23 | int i; | |
| 24 | ||
| 25 | for (i=0, cp = uu; i < 16; i++) | |
| 26 | if (*cp) | |
| 27 | return 0; | |
| 28 | return 1; | |
| 29 | } | |
| 30 | ||
| 31 | static void e2p_unpack_uuid(void *in, struct uuid *uu) | |
| 32 | { | |
| 33 | __u8 *ptr = in; | |
| 34 | __u32 tmp; | |
| 35 | ||
| 36 | tmp = *ptr++; | |
| 37 | tmp = (tmp << 8) | *ptr++; | |
| 38 | tmp = (tmp << 8) | *ptr++; | |
| 39 | tmp = (tmp << 8) | *ptr++; | |
| 40 | uu->time_low = tmp; | |
| 41 | ||
| 42 | tmp = *ptr++; | |
| 43 | tmp = (tmp << 8) | *ptr++; | |
| 44 | uu->time_mid = tmp; | |
| 45 | ||
| 46 | tmp = *ptr++; | |
| 47 | tmp = (tmp << 8) | *ptr++; | |
| 48 | uu->time_hi_and_version = tmp; | |
| 49 | ||
| 50 | tmp = *ptr++; | |
| 51 | tmp = (tmp << 8) | *ptr++; | |
| 52 | uu->clock_seq = tmp; | |
| 53 | ||
| 54 | memcpy(uu->node, ptr, 6); | |
| 55 | } | |
| 56 | ||
| 57 | void e2p_uuid_to_str(void *uu, char *out) | |
| 58 | { | |
| 59 | struct uuid uuid; | |
| 60 | ||
| 61 | e2p_unpack_uuid(uu, &uuid); | |
| 62 | sprintf(out, | |
| 63 | "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
| 64 | uuid.time_low, uuid.time_mid, uuid.time_hi_and_version, | |
| 65 | uuid.clock_seq >> 8, uuid.clock_seq & 0xFF, | |
| 66 | uuid.node[0], uuid.node[1], uuid.node[2], | |
| 67 | uuid.node[3], uuid.node[4], uuid.node[5]); | |
| 68 | } |