LXR 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
  12struct 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 */
  21int 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
  32static 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
  58void 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
  71const 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}
  79