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79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* uuid.c -- utility routines for manipulating UUID's.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "../ext2fs/ext2_types.h"
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#include "e2p.h"
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struct uuid {
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__u32 time_low;
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__u16 time_mid;
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__u16 time_hi_and_version;
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__u16 clock_seq;
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__u8 node[6];
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};
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/* Returns 1 if the uuid is the NULL uuid */
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int e2p_is_null_uuid(void *uu)
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{
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__u8 *cp;
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int i;
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for (i=0, cp = uu; i < 16; i++)
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if (*cp)
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return 0;
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return 1;
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}
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static void e2p_unpack_uuid(void *in, struct uuid *uu)
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{
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__u8 *ptr = in;
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__u32 tmp;
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tmp = *ptr++;
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tmp = (tmp << 8) | *ptr++;
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tmp = (tmp << 8) | *ptr++;
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tmp = (tmp << 8) | *ptr++;
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uu->time_low = tmp;
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tmp = *ptr++;
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tmp = (tmp << 8) | *ptr++;
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uu->time_mid = tmp;
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tmp = *ptr++;
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tmp = (tmp << 8) | *ptr++;
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uu->time_hi_and_version = tmp;
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tmp = *ptr++;
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tmp = (tmp << 8) | *ptr++;
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uu->clock_seq = tmp;
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memcpy(uu->node, ptr, 6);
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}
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void e2p_uuid_to_str(void *uu, char *out)
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{
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struct uuid uuid;
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e2p_unpack_uuid(uu, &uuid);
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sprintf(out,
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"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
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uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
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uuid.node[0], uuid.node[1], uuid.node[2],
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uuid.node[3], uuid.node[4], uuid.node[5]);
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}
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const char *e2p_uuid2str(void *uu)
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{
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static char buf[80];
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if (e2p_is_null_uuid(uu))
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return "<none>";
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e2p_uuid_to_str(uu, buf);
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return buf;
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}
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