324 lines
9.2 KiB
C
324 lines
9.2 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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* ATADJUST() CT3 string function
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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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* ATADJUST()
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* $CATEGORY$
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* CT3 string functions
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* $ONELINER$
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* Adjusts a sequence within a string to a specified position
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* $SYNTAX$
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* ATADJUST (<cStringToMatch>, <cString>, <nAdjustPosition>,
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* [<nCounter>], [<nIgnore>],
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* [<nFillChar|cFillChar>]) -> cString
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* $ARGUMENTS$
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* <cStringToMatch> is the sequence to be adjusted within <cString>
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* <cString> is the string that contains <cStringToMatch>
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* <nAdjustPosition> specifies the position to that <cStringToMatch>
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* will be adjusted
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* [<nCounter>] specifies which occurence of <cStringToMatch>
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* in <cString> is to be adjusted
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* Default: last occurence
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* [<nIgnore>] specifies how many characters should be omitted
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* in the scan
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* [<nFillChar|cFillChar>] specifies the character that is used for the
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* adjustment
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* $RETURNS$
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* cString the changed string
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* $DESCRIPTION$
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* <TODO: add a description, some examples and tests here>
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* $EXAMPLES$
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* $TESTS$
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* $STATUS$
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* Ready
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* $COMPLIANCE$
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* ATADJUST() works like CT3's ATADJUST()
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* $PLATFORMS$
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* All
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* $FILES$
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* Source is atadjust.c, library is ct3.
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* $SEEALSO$
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* SETATLIKE() CSETATMUPA()
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* $END$
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*/
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HB_FUNC (ATADJUST)
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{
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if ((ISCHAR (1)) && (ISCHAR (2)) &&
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(ISNUM (3)))
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{
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char *pcStringToMatch = hb_parc (1);
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size_t sStrToMatchLen = (size_t)hb_parclen (1);
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char *pcString = hb_parc (2);
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size_t sStrLen = (size_t)hb_parclen (2);
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size_t sAdjustPosition = hb_parnl (3);
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int iMultiPass = ct_getatmupa();
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int iAtLike = ct_getatlike();
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char cAtLike = ct_getatlikechar();
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size_t sIgnore, sMatchStrLen;
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ULONG ulCounter;
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char *pc;
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char cFillChar;
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char *pcRetStr, *pcCheckFill;
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size_t sRetStrLen;
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/* eventually ignore some characters */
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if (ISNUM (5))
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sIgnore = (size_t)hb_parnl (5);
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else
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sIgnore = 0;
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if (sIgnore >= sStrLen)
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{
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hb_retclen (pcString, sStrLen);
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return;
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}
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else
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{
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pcString += sIgnore;
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sStrLen -= sIgnore;
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}
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/* check for wrong adjust position */
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if (sAdjustPosition == 0)
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{
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hb_retclen (pcString, sStrLen);
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return;
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}
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else
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sAdjustPosition--; /* makes live easier since C indices start at zero ! */
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/* nth match or last match ? */
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if (ISNUM (4) && ((ulCounter = hb_parnl (4)) != 0))
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{
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/* find the <ulCounter>th match */
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char *pcSubStr;
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size_t sSubStrLen;
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ULONG ulMatchCounter = 0;
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pcSubStr = pcString;
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sSubStrLen = sStrLen;
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while (ulMatchCounter < ulCounter)
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{
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switch (iAtLike)
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{
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case CT_SETATLIKE_EXACT:
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{
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pc = ct_at_exact_forward (pcSubStr, sSubStrLen,
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pcStringToMatch, sStrToMatchLen,
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&sMatchStrLen);
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}; break;
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case CT_SETATLIKE_WILDCARD:
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{
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pc = ct_at_wildcard_forward (pcSubStr, sSubStrLen,
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pcStringToMatch, sStrToMatchLen,
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cAtLike, &sMatchStrLen);
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}; break;
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default:
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{
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pc = NULL;
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};
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}
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if (pc == NULL)
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{
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/* no match found; if this happens at this point,
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there are no <ulCounter> matches, so return */
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hb_retclen (pcString, sStrLen);
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return;
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}
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ulMatchCounter++;
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if (iMultiPass)
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pcSubStr = pc+1;
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else
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pcSubStr = pc+sMatchStrLen;
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sSubStrLen = sStrLen-(pcSubStr-pcString);
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}
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}
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else /* (ISNUM (4) && ((ulCounter = hb_parnl (4)) != 0) */
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{
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/* we have to find the last match */
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switch (iAtLike)
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{
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case CT_SETATLIKE_EXACT:
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{
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pc = ct_at_exact_backward (pcString, sStrLen,
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pcStringToMatch, sStrToMatchLen,
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&sMatchStrLen);
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}; break;
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case CT_SETATLIKE_WILDCARD:
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{
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pc = ct_at_wildcard_backward (pcString, sStrLen,
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pcStringToMatch, sStrToMatchLen,
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cAtLike, &sMatchStrLen);
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}; break;
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default:
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{
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pc = NULL;
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};
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}
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if (pc == NULL)
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{
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/* no matches found */
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hb_retclen (pcString, sStrLen);
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return;
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}
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}
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/* adjust string */
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if (ISCHAR (6))
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if (hb_parclen (6) > 0)
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cFillChar = *(hb_parc (6));
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else
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cFillChar = 0x20;
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else
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if (ISNUM (6))
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cFillChar = hb_parnl (6)%256;
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else
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cFillChar = 0x20;
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/* position of pc == adjust position ? */
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if (pc == pcString+sAdjustPosition)
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{
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/* do nothing */
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hb_retclen (pcString, sStrLen);
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}
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else
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{
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if (pc > pcString+sAdjustPosition)
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{
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/* adjust to left */
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/* check if we only delete cFillChar characters */
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for (pcCheckFill = pcString+sAdjustPosition; pcCheckFill < pc; pcCheckFill++)
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if (*pcCheckFill != cFillChar)
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{
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/* no -> return string unchanged */
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hb_retclen (pcString, sStrLen);
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return;
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}
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/* ok -> calculate new string size */
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sRetStrLen = sStrLen-(pc-(pcString+sAdjustPosition));
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pcRetStr = hb_xgrab (sRetStrLen);
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/* copy first portion of string */
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if (sAdjustPosition > 0)
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hb_xmemcpy (pcRetStr, pcString, sAdjustPosition);
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/* copy second portion of string */
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if (sRetStrLen > sAdjustPosition)
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hb_xmemcpy (pcRetStr+sAdjustPosition, pc, sRetStrLen-sAdjustPosition);
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hb_retclen (pcRetStr, sRetStrLen);
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hb_xfree (pcRetStr);
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}
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else
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{
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/* adjust to right */
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sRetStrLen = sStrLen+(pcString+sAdjustPosition)-pc;
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pcRetStr = hb_xgrab (sRetStrLen);
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/* copy first portion of string */
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if (pc > pcString)
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hb_xmemcpy (pcRetStr, pcString, pc-pcString);
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/* fill characters */
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hb_xmemset (pcRetStr+(pc-pcString), cFillChar, sAdjustPosition-(pc-pcString));
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/* copy second portion of string */
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if (sRetStrLen > sAdjustPosition)
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hb_xmemcpy (pcRetStr+sAdjustPosition, pc, sRetStrLen-sAdjustPosition);
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hb_retclen (pcRetStr, sRetStrLen);
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hb_xfree (pcRetStr);
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}
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}
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}
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else /* ((ISCHAR (1)) && (ISCHAR (2)) && (ISNUM (3))) */
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{
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if (ISCHAR (2))
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hb_retclen (hb_parc (2), hb_parclen (2));
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else
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hb_retc ("");
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}
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return;
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}
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