release/src/router/busybox/e2fsprogs/old_e2fsprogs/e2p/uuid.c

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