374 lines
11 KiB
C
374 lines
11 KiB
C
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* The Date API (C level)
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*
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* Copyright 1999 Antonio Linares <alinares@fivetech.com>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version, with one exception:
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*
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* The exception is that if you link the Harbour Runtime Library (HRL)
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* and/or the Harbour Virtual Machine (HVM) with other files to produce
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* an executable, this does not by itself cause the resulting executable
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* to be covered by the GNU General Public License. Your use of that
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* executable is in no way restricted on account of linking the HRL
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* and/or HVM code into it.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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* their web site at http://www.gnu.org/).
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*
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*/
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/*
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* The following parts are Copyright of the individual authors.
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* www - http://www.harbour-project.org
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*
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* Copyright 1999 Jose Lalin <dezac@corevia.com>
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* hb_dow()
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*
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* Copyright 1999 David G. Holm <dholm@jsd-llc.com>
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* hb_dtoc()
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*
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* Copyright 1999 Victor Szakats <info@szelvesz.hu>
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* hb_dateEncStr()
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* hb_dateDecStr()
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* hb_dateStrPut()
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* hb_dateStrGet()
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*
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* See doc/license.txt for licensing terms.
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*
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*/
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#include <ctype.h>
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#include "hbapi.h"
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#include "hbdate.h"
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long hb_dateEncode( long lDay, long lMonth, long lYear )
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{
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HB_TRACE(HB_TR_DEBUG, ("hb_dateEncode(%ld, %ld, %ld)", lDay, lMonth, lYear));
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/* Perform date validation */
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if( lYear >= 1 && lYear <= 2999 &&
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lMonth >= 1 && lMonth <= 12 &&
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lDay >= 1 )
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{
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/* Month, year, and lower day limits are simple,
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but upper day limit is dependent upon month and leap year */
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USHORT auiDayLimit[ 12 ] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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if( ( ( lYear % 4 == 0 && lYear % 100 != 0 ) || lYear % 400 == 0 ) )
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auiDayLimit[ 1 ] = 29;
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if( lDay <= ( long ) auiDayLimit[ ( int ) lMonth - 1 ] )
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{
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long lFactor = ( lMonth < 3 ) ? -1 : 0;
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return ( 1461 * ( lFactor + 4800 + lYear ) / 4 ) +
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( ( lMonth - 2 - ( lFactor * 12 ) ) * 367 ) / 12 -
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( 3 * ( ( lFactor + 4900 + lYear ) / 100 ) / 4 ) +
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lDay - 32075;
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}
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}
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return 0;
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}
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void hb_dateDecode( long lJulian, long * plDay, long * plMonth, long * plYear )
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{
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HB_TRACE(HB_TR_DEBUG, ("hb_dateDecode(%ld, %p, %p, %p)", lJulian, plDay, plMonth, plYear));
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if( lJulian > 0 )
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{
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long U, V, W, X;
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lJulian += 68569;
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W = ( lJulian * 4 ) / 146097;
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lJulian -= ( ( 146097 * W ) + 3 ) / 4;
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X = 4000 * ( lJulian + 1 ) / 1461001;
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lJulian -= ( ( 1461 * X ) / 4 ) - 31;
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V = 80 * lJulian / 2447;
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U = V / 11;
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*plDay = lJulian - ( 2447 * V / 80 );
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*plMonth = V + 2 - ( U * 12 );
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*plYear = X + U + ( W - 49 ) * 100;
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}
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else
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{
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*plDay =
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*plMonth =
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*plYear = 0;
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}
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}
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void hb_dateStrPut( char * szDate, long lDay, long lMonth, long lYear )
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{
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HB_TRACE(HB_TR_DEBUG, ("hb_dateStrPut(%p, %ld, %ld, %ld)", szDate, lDay, lMonth, lYear));
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if( lDay && lMonth && lYear )
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{
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szDate[ 0 ] = ( lYear / 1000 ) + '0';
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szDate[ 1 ] = ( ( lYear % 1000 ) / 100 ) + '0';
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szDate[ 2 ] = ( ( lYear % 100 ) / 10 ) + '0';
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szDate[ 3 ] = ( lYear % 10 ) + '0';
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szDate[ 4 ] = ( lMonth / 10 ) + '0';
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szDate[ 5 ] = ( lMonth % 10 ) + '0';
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szDate[ 6 ] = ( lDay / 10 ) + '0';
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szDate[ 7 ] = ( lDay % 10 ) + '0';
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}
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else
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memset( szDate, ' ', 8 );
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}
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void hb_dateStrGet( const char * szDate, long * plDay, long * plMonth, long * plYear )
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{
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HB_TRACE(HB_TR_DEBUG, ("hb_dateStrGet(%s, %p, %p, %p)", szDate, plDay, plMonth, plYear));
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if( szDate && szDate[ 8 ] == '\0' )
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{
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/* Date string has correct length, so attempt to convert */
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*plDay = ( ( szDate[ 6 ] - '0' ) * 10 ) + ( szDate[ 7 ] - '0' );
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*plMonth = ( ( szDate[ 4 ] - '0' ) * 10 ) + ( szDate[ 5 ] - '0' );
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*plYear = ( ( szDate[ 0 ] - '0' ) * 1000 ) + ( ( szDate[ 1 ] - '0' ) * 100 ) +
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( ( szDate[ 2 ] - '0' ) * 10 ) + ( szDate[ 3 ] - '0' );
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}
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else
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{
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/* Date string missing or bad length, so force an empty date */
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*plDay =
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*plMonth =
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*plYear = 0;
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}
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}
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/* This function always closes the date with a zero byte, so it needs a
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9 character long buffer. */
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char * hb_dateDecStr( char * szDate, long lJulian )
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{
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long lDay, lMonth, lYear;
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HB_TRACE(HB_TR_DEBUG, ("hb_dateDecStr(%p, %ld)", szDate, lJulian));
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hb_dateDecode( lJulian, &lDay, &lMonth, &lYear );
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hb_dateStrPut( szDate, lDay, lMonth, lYear );
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szDate[ 8 ] = '\0';
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return szDate;
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}
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long hb_dateEncStr( char * szDate )
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{
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long lDay, lMonth, lYear;
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HB_TRACE(HB_TR_DEBUG, ("hb_dateEncStr(%s)", szDate));
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hb_dateStrGet( szDate, &lDay, &lMonth, &lYear );
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return hb_dateEncode( lDay, lMonth, lYear );
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}
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/* NOTE: szFormattedDate must be an at least 11 chars wide buffer */
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char * hb_dtoc( const char * szDate, char * szFormattedDate, const char * szDateFormat )
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{
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/*
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* NOTE: szFormattedDate must point to a buffer of at least 11 bytes.
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* szDateFormat must point to a buffer holding the date format to use.
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*/
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int format_count, digit_count, size;
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HB_TRACE(HB_TR_DEBUG, ("hb_dtoc(%s, %p, %s)", szDate, szFormattedDate, szDateFormat));
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/*
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* Determine the maximum size of the formatted date string
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*/
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size = strlen( szDateFormat );
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if( size > 10 ) size = 10;
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if( szDate && szFormattedDate && strlen( szDate ) == 8 ) /* A valid date is always 8 characters */
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{
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const char * szPtr;
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int digit;
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BOOL used_d, used_m, used_y;
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format_count = 0;
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used_d = used_m = used_y = FALSE;
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szPtr = szDateFormat;
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while( format_count < size )
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{
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digit = toupper( *szPtr );
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szPtr++;
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digit_count = 1;
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while( toupper( *szPtr ) == digit && format_count < size )
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{
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szPtr++;
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if( format_count + digit_count < size ) digit_count++;
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}
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switch( digit )
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{
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case 'D':
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switch( digit_count )
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{
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case 4:
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if( ! used_d && format_count < size )
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{
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szFormattedDate[ format_count++ ] = '0';
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digit_count--;
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}
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case 3:
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if( ! used_d && format_count < size )
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{
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szFormattedDate[ format_count++ ] = '0';
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digit_count--;
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}
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case 2:
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if( ! used_d && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 6 ];
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digit_count--;
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}
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default:
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if( ! used_d && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 7 ];
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digit_count--;
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}
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while( digit_count-- > 0 && format_count < size ) szFormattedDate[ format_count++ ] = digit;
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}
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used_d = TRUE;
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break;
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case 'M':
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switch ( digit_count )
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{
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case 4:
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if( ! used_m && format_count < size )
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{
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szFormattedDate[ format_count++ ] = '0';
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digit_count--;
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}
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case 3:
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if( ! used_m && format_count < size )
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{
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szFormattedDate[ format_count++ ] = '0';
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digit_count--;
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}
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case 2:
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if( ! used_m && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 4 ];
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digit_count--;
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}
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default:
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if( ! used_m && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 5 ];
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digit_count--;
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}
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while( digit_count-- > 0 && format_count < size ) szFormattedDate[ format_count++ ] = digit;
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}
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used_m = TRUE;
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break;
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case 'Y':
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switch( digit_count )
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{
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case 4:
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if( ! used_y && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 0 ];
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digit_count--;
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}
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case 3:
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if( ! used_y && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 1 ];
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digit_count--;
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}
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case 2:
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if( ! used_y && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 2 ];
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digit_count--;
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}
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default:
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if( ! used_y && format_count < size )
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{
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szFormattedDate[ format_count++ ] = szDate[ 3 ];
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digit_count--;
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}
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while( digit_count-- > 0 && format_count < size ) szFormattedDate[ format_count++ ] = digit;
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}
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used_y = TRUE;
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break;
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default:
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while( digit_count-- > 0 && format_count < size ) szFormattedDate[ format_count++ ] = digit;
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}
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}
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}
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else
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{
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/* Not a valid date string, so return a blank date with separators */
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format_count = size; /* size is either 8 or 10 */
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strncpy( szFormattedDate, szDateFormat, size );
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for( digit_count = 0; digit_count < size; digit_count++ )
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{
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switch( szFormattedDate[ digit_count ] )
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{
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case 'D':
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case 'd':
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case 'M':
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case 'm':
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case 'Y':
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case 'y':
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szFormattedDate[ digit_count ] = ' ';
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}
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}
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}
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szFormattedDate[ format_count ] = '\0';
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return szFormattedDate;
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}
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long hb_dow( long lDay, long lMonth, long lYear )
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{
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HB_TRACE(HB_TR_DEBUG, ("hb_dow(%ld, %ld, %ld)", lDay, lMonth, lYear));
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if( lMonth < 3 )
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{
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lMonth += 13;
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lYear--;
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}
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else
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lMonth++;
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return ( lDay + 26 * lMonth / 10 +
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lYear + lYear / 4 - lYear / 100 + lYear / 400 + 6 ) % 7 + 1;
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}
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