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83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/* csn.c - Change Sequence Number routines */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 2000-2008 The OpenLDAP Foundation.
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* Portions Copyright 2000-2003 Kurt D. Zeilenga.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Portions 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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/* This work was developed by John E. Schimmel and adapted for
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* inclusion in OpenLDAP Software by Kurt D. Zeilenga.
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*/
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/* This file contains routines to generate a change sequence number.
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* Every add, delete, and modification is given a unique identifier
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* for use in 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, 3, and
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* 6, respectively. (In previous implementations r was only 2 digits.)
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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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/* Must be mutex-protected, because lutil_gettime needs mutex protection */
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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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struct lutil_tm tm;
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int n;
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lutil_gettime( &tm );
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n = snprintf( buf, len,
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"%4d%02d%02d%02d%02d%02d.%06dZ#%06x#%03x#%06x",
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tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
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tm.tm_min, tm.tm_sec, tm.tm_usec, tm.tm_usub, 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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