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72cfae7264
LDUP specifications. Once LDUP agrees on the format (let's hope they choose GSER), this will need to be updated.
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* Copyright 1998-2003 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 (loosly) based upon draft-ietf-ldup-model-03.txt,
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* A WORK IN PROGRESS. The format will likely change.
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*
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* The format of a CSN string is: yyyymmddhhmmssz#s#r#c
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* where s is a counter of operations within a timeslice, r is
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* the replica id (normally zero), and c is a counter of
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* modifications within this operation. s, r, and c are
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* represented in hex and zero padded to lengths of 6, 2, and
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* 6, respectively.
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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,
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"%4d%02d%02d%02d%02d%02dZ#%06x#%02x#%06x",
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ltm->tm_year + 1900, ltm->tm_mon + 1, 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[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
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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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