316 lines
7.7 KiB
C
316 lines
7.7 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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* POSDIFF() and POSEQUAL() CT3 string functions
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*
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* Copyright 2001 IntTec GmbH, Neunlindenstr 32, 79106 Freiburg, Germany
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* Author: Martin Vogel <vogel@inttec.de>
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*
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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, or (at your option)
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* any later version.
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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 software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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#include "ct.h"
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/* $DOC$
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* $FUNCNAME$
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* POSDIFF()
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* $CATEGORY$
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* CT3 string functions
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* $ONELINER$
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* The left-most position there two string differ
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* $SYNTAX$
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* POSDIFF (<cString1>, <cString2>, [<nIgnore>]) -> nPosition
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* $ARGUMENTS$
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* $RETURNS$
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* $DESCRIPTION$
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* TODO: add documentation
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* $EXAMPLES$
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* $TESTS$
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* $STATUS$
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* Started
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* $COMPLIANCE$
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* POSDIFF() is compatible with CT3's POSDIFF().
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* $PLATFORMS$
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* All
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* $FILES$
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* Source is posdiff.c, library is libct.
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* $SEEALSO$
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* POSEQUAL()
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* $END$
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*/
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HB_FUNC (POSDIFF)
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{
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if (ISCHAR (1) && ISCHAR (2))
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{
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char *pcString1 = hb_parc (1);
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size_t sStrLen1 = hb_parclen (1);
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char *pcString2 = hb_parc (2);
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size_t sStrLen2 = hb_parclen (2);
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char *pc1, *pc2;
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size_t sIgnore;
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if (ISNUM (3))
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sIgnore = hb_parnl (3);
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else
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sIgnore = 0;
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if ((sIgnore > sStrLen1) || (sIgnore > sStrLen2))
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{
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int iArgErrorMode = ct_getargerrormode();
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if (iArgErrorMode != CT_ARGERR_IGNORE)
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{
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ct_error ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_POSDIFF,
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NULL, "POSDIFF", 0, EF_CANDEFAULT, 3,
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hb_paramError (1), hb_paramError (2),
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hb_paramError (3));
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}
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hb_retnl (0);
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return;
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}
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if (sStrLen1 != sStrLen2)
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{
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hb_retnl ((sStrLen1 < sStrLen2 ? sStrLen1 : sStrLen2)+1);
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return;
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}
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pc1 = pcString1+sIgnore;
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pc2 = pcString2+sIgnore;
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while (pc1 < pcString1+sStrLen1)
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{
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if (*pc1 != *pc2)
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{
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hb_retnl ((pc1-pcString1)+1);
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return;
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}
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pc1++;
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pc2++;
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}
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hb_retnl (0);
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}
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else /* (ISCHAR (1) && ISCHAR (2)) */
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{
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PHB_ITEM pSubst = NULL;
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int iArgErrorMode = ct_getargerrormode();
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if (iArgErrorMode != CT_ARGERR_IGNORE)
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{
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pSubst = ct_error_subst ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_POSDIFF,
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NULL, "POSDIFF", 0, EF_CANSUBSTITUTE, 3,
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hb_paramError (1), hb_paramError (2), hb_paramError (3));
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}
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if (pSubst != NULL)
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{
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hb_itemReturn (pSubst);
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hb_itemRelease (pSubst);
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}
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else
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{
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if (ISCHAR (1) || ISCHAR (2))
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hb_retnl (1);
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else
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hb_retnl (0);
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}
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}
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return;
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}
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/* $DOC$
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* $FUNCNAME$
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* POSEQUAL()
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* $CATEGORY$
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* CT3 string functions
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* $ONELINER$
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* The left-most position there two string begin to be equal
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* $SYNTAX$
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* POSEQUAL (<cString1>, <cString2>, [<nCompare>], [<nIgnore>]) -> nPosition
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* $ARGUMENTS$
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* $RETURNS$
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* $DESCRIPTION$
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* TODO: add documentation
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* $EXAMPLES$
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* $TESTS$
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* $STATUS$
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* Started
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* $COMPLIANCE$
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* POSEQUAL() is compatible with CT3's POSEQUAL().
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* $PLATFORMS$
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* All
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* $FILES$
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* Source is posdiff.c, library is libct.
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* $SEEALSO$
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* POSDIFF()
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* $END$
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*/
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HB_FUNC (POSEQUAL)
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{
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if (ISCHAR (1) && ISCHAR (2))
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{
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char *pcString1 = hb_parc (1);
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size_t sStrLen1 = hb_parclen (1);
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char *pcString2 = hb_parc (2);
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size_t sStrLen2 = hb_parclen (2);
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char *pc1, *pc2;
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size_t sIgnore, sCompare, sCompareCnt, sRet = 0;
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if (ISNUM (4))
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sIgnore = hb_parnl (4);
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else
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sIgnore = 0;
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if (ISNUM (3))
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sCompare = hb_parnl (3);
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else
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sCompare = (sStrLen1 < sStrLen2 ? sStrLen1 : sStrLen2)-sIgnore;
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if ((sCompare == 0) || (sIgnore > sStrLen1) || (sIgnore > sStrLen2))
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{
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int iArgErrorMode = ct_getargerrormode();
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if (iArgErrorMode != CT_ARGERR_IGNORE)
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{
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ct_error ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_POSEQUAL,
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NULL, "POSEQUAL", 0, EF_CANDEFAULT, 4,
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hb_paramError (1), hb_paramError (2),
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hb_paramError (3), hb_paramError (4));
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}
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hb_retnl (0);
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return;
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}
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if ((sStrLen1 < (sCompare+sIgnore)) || (sStrLen2 < (sCompare+sIgnore)))
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{
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int iArgErrorMode = ct_getargerrormode();
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if (iArgErrorMode != CT_ARGERR_IGNORE)
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{
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ct_error ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_POSEQUAL,
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NULL, "POSEQUAL", 0, EF_CANDEFAULT, 4,
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hb_paramError (1), hb_paramError (2),
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hb_paramError (3), hb_paramError (4));
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}
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hb_retnl (0);
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return;
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}
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pc1 = pcString1+sIgnore;
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pc2 = pcString2+sIgnore;
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sCompareCnt = 0;
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while (pc1 < pcString1+sStrLen1)
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{
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if (*pc1 == *pc2)
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{
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/* save possible return value */
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if (sCompareCnt == 0)
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sRet = pc1-pcString1+1;
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sCompareCnt++;
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if (sCompareCnt == sCompare)
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{
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hb_retnl (sRet);
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return;
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}
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}
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else
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{
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/* reset compare counter */
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sCompareCnt = 0;
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}
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pc1++;
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pc2++;
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}
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hb_retnl (0);
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}
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else /* (ISCHAR (1) && ISCHAR (2)) */
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{
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PHB_ITEM pSubst = NULL;
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int iArgErrorMode = ct_getargerrormode();
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if (iArgErrorMode != CT_ARGERR_IGNORE)
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{
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pSubst = ct_error_subst ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_POSEQUAL,
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NULL, "POSEQUAL", 0, EF_CANSUBSTITUTE, 4,
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hb_paramError (1), hb_paramError (2),
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hb_paramError (3), hb_paramError (4));
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}
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if (pSubst != NULL)
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{
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hb_itemReturn (pSubst);
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hb_itemRelease (pSubst);
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}
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else
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{
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hb_retnl (0);
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}
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}
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return;
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}
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