97 lines
3.2 KiB
C
97 lines
3.2 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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* SOUNDEX() function
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*
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* Copyright 1999 Victor Szakats <info@szelvesz.hu>
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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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#include <ctype.h>
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#include "hbapi.h"
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#include "hbapiitm.h"
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#define SOUNDEX_LEN_MAX 4
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HB_FUNC( SOUNDEX )
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{
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PHB_ITEM pString = hb_param( 1, HB_IT_STRING );
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char szResult[ SOUNDEX_LEN_MAX + 1 ];
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/* NOTE: The result will always be a zero terminated string without any
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embedded zeros and special characters. [vszakats] */
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memset( szResult, '0', SOUNDEX_LEN_MAX );
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szResult[ SOUNDEX_LEN_MAX ] = '\0';
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if( pString )
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{
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char * pszString = hb_itemGetCPtr( pString );
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ULONG ulLen = hb_itemGetCLen( pString );
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ULONG nPos = 0;
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ULONG nResultPos = 0;
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char cCharPrev = '0';
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while( nPos < ulLen && nResultPos < SOUNDEX_LEN_MAX )
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{
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char cChar = pszString[ nPos ];
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/* NOTE: Intentionally not using toupper()/isalpha() to be 100%
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Clipper compatible here, these ANSI C functions may behave
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differently for accented and national characters. It's also
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faster this way. [vszakats] */
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/* Convert to uppercase: toupper() */
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if( cChar >= 'a' && cChar <= 'z' )
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cChar -= ( 'a' - 'A' );
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/* Check if isalpha() */
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if( cChar >= 'A' && cChar <= 'Z' )
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{
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static const char s_szTable[] = "01230120022455012623010202"; /* NOTE: SoundEx result codes for letters from "A" to "Z" */
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/* "ABCDEFGHIJKLMNOPQRSTUVWXYZ" */
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char cCharConverted = ( ( cChar - 'A' ) > ( sizeof( s_szTable ) - 1 ) ) ? '9' : s_szTable[ cChar - 'A' ];
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if( nResultPos == 0 )
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szResult[ nResultPos++ ] = cChar;
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else if( cCharConverted != '0' && cCharConverted != cCharPrev )
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szResult[ nResultPos++ ] = cCharConverted;
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cCharPrev = cCharConverted;
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}
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nPos++;
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}
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}
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hb_retc( szResult );
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}
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