1 /* 2 * uuid.c -- utility routines for manipulating UUID's. 3 * 4 * %Begin-Header% 5 * This file may be redistributed under the terms of the GNU Library 6 * General Public License, version 2. 7 * %End-Header% 8 */ 9 10 #include <stdio.h> 11 #include <string.h> 12 #include <ext2fs/ext2_types.h> 13 14 #include "e2p.h" 15 16 struct uuid { 17 __u32 time_low; 18 __u16 time_mid; 19 __u16 time_hi_and_version; 20 __u16 clock_seq; 21 __u8 node[6]; 22 }; 23 24 /* Returns 1 if the uuid is the NULL uuid */ 25 int e2p_is_null_uuid(void *uu) 26 { 27 __u8 *cp; 28 int i; 29 30 for (i=0, cp = uu; i < 16; i++) 31 if (*cp++) 32 return 0; 33 return 1; 34 } 35 36 static void e2p_unpack_uuid(void *in, struct uuid *uu) 37 { 38 __u8 *ptr = in; 39 __u32 tmp; 40 41 tmp = *ptr++; 42 tmp = (tmp << 8) | *ptr++; 43 tmp = (tmp << 8) | *ptr++; 44 tmp = (tmp << 8) | *ptr++; 45 uu->time_low = tmp; 46 47 tmp = *ptr++; 48 tmp = (tmp << 8) | *ptr++; 49 uu->time_mid = tmp; 50 51 tmp = *ptr++; 52 tmp = (tmp << 8) | *ptr++; 53 uu->time_hi_and_version = tmp; 54 55 tmp = *ptr++; 56 tmp = (tmp << 8) | *ptr++; 57 uu->clock_seq = tmp; 58 59 memcpy(uu->node, ptr, 6); 60 } 61 62 void e2p_uuid_to_str(void *uu, char *out) 63 { 64 struct uuid uuid; 65 66 e2p_unpack_uuid(uu, &uuid); 67 sprintf(out, 68 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 69 uuid.time_low, uuid.time_mid, uuid.time_hi_and_version, 70 uuid.clock_seq >> 8, uuid.clock_seq & 0xFF, 71 uuid.node[0], uuid.node[1], uuid.node[2], 72 uuid.node[3], uuid.node[4], uuid.node[5]); 73 } 74 75 const char *e2p_uuid2str(void *uu) 76 { 77 static char buf[80]; 78 79 if (e2p_is_null_uuid(uu)) 80 return "<none>"; 81 e2p_uuid_to_str(uu, buf); 82 return buf; 83 } 84 85
