1 /* 2 * uuid.c -- utility routines for manipulating UUID's. 3 */ 4 5 #include <stdio.h> 6 #include <string.h> 7 #include <ext2fs/ext2_types.h> 8 9 #include "e2p.h" 10 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 } 69 70 const char *e2p_uuid2str(void *uu) 71 { 72 static char buf[80]; 73 74 if (e2p_is_null_uuid(uu)) 75 return "<none>"; 76 e2p_uuid_to_str(uu, buf); 77 return buf; 78 } 79 80
