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78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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/* Portions
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* Copyright 2000, John E. Schimmel, All rights reserved.
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* This software is not subject to any license of Mirapoint, Inc.
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*
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* This is free software; you can redistribute and use it
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* under the same terms as OpenLDAP itself.
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*/
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/* Adapted for incorporatation into OpenLDAP by Kurt Zeilenga */
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/*
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* This file contains routines to generate a change sequence number. Every
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* add delete, and modification is given a unique identifier for use in
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* resolving conflicts during replication operations.
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*
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* These routines are based upon draft-ietf-ldup-model-03.txt, and will
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* need to be revisited once standardized.
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*
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* The format of a CSN string is: yyyymmddhh:mm:ssz#0xSSSS#d#0xssss
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* where SSSS is a counter of operations within a timeslice, d is an
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* offset into a list of replica records, and ssss is a counter of
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* modifications within this operation.
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*
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* Calls to this routine MUST be serialized with other calls
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* to gmtime().
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/time.h>
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#include <lutil.h>
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size_t
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lutil_csnstr(char *buf, size_t len, unsigned int replica, unsigned int mod)
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{
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static time_t csntime;
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static unsigned int csnop;
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time_t t;
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unsigned int op;
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struct tm *ltm;
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int n;
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time( &t );
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if ( t > csntime ) {
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csntime = t;
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csnop = 0;
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}
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op = ++csnop;
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ltm = gmtime( &t );
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n = snprintf( buf, len, "%4d%02d%02d%02d:%02d:%02dZ#0x%04x#%d#%04x",
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ltm->tm_year + 1900, ltm->tm_mon, ltm->tm_mday, ltm->tm_hour,
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ltm->tm_min, ltm->tm_sec, op, replica, mod );
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if( n < 0 ) return 0;
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return ( (size_t) n < len ) ? n : 0;
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}
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#ifdef TEST
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int
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main(int argc, char **argv)
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{
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char buf[256];
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if ( ! lutil_csnstr( buf, (size_t) 10, 0, 0 ) ) {
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fprintf(stderr, "failed lutil_csnstr\n");
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}
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if ( ! lutil_csnstr( buf, sizeof(buf), 0, 0 ) ) {
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fprintf(stderr, "failed lutil_csnstr\n");
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}
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}
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#endif
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