81c9b0506c
* contrib/*
* Deleted 'www.' from harbour-project.org website name.
(www.harbour-project.org -> harbour-project.org)
281 lines
8.4 KiB
C
281 lines
8.4 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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* CT3 string functions
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* - CHARSWAP()
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* - WORDSWAP()
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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://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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/* defines */
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#define DO_CHARSWAP_CHARSWAP 0
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#define DO_CHARSWAP_WORDSWAP 1
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#define DO_CHARSWAP_WORDSWAP_CHARSWAP 2
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/* helper function for the charswap and wordswap functions */
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static void do_charswap( int iSwitch )
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{
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int iNoRet;
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/* suppress return value ? */
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iNoRet = ct_getref() && HB_ISBYREF( 1 );
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/* param check */
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if( HB_ISCHAR( 1 ) )
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{
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const char *pcString = hb_parc( 1 );
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HB_SIZE sStrLen = hb_parclen( 1 );
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char *pcRet;
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HB_SIZE sRetIndex = 0;
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int iShift, iMod;
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const char *pcSub;
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if( sStrLen == 0 )
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{
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if( iNoRet )
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hb_ret();
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else
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hb_retc_null();
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return;
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}
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if( iSwitch == DO_CHARSWAP_WORDSWAP )
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{
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iShift = 4;
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if( hb_parl( 2 ) )
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{
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iSwitch = DO_CHARSWAP_WORDSWAP_CHARSWAP;
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}
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}
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else
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{
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iShift = 2;
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}
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pcRet = ( char * ) hb_xgrab( sStrLen );
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for( pcSub = pcString; pcSub < pcString + sStrLen + 1 - iShift; pcSub += iShift )
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{
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switch ( iSwitch )
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{
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case DO_CHARSWAP_WORDSWAP:
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pcRet[sRetIndex++] = pcSub[2];
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pcRet[sRetIndex++] = pcSub[3];
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pcRet[sRetIndex++] = pcSub[0];
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pcRet[sRetIndex++] = pcSub[1];
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break;
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case DO_CHARSWAP_WORDSWAP_CHARSWAP:
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pcRet[sRetIndex++] = pcSub[3];
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pcRet[sRetIndex++] = pcSub[2];
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/* no 'break' here !! */
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case DO_CHARSWAP_CHARSWAP:
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pcRet[sRetIndex++] = pcSub[1];
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pcRet[sRetIndex++] = pcSub[0];
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}
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}
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/* copy rest of string */
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if( ( iSwitch == DO_CHARSWAP_WORDSWAP ) || ( iSwitch == DO_CHARSWAP_WORDSWAP_CHARSWAP ) )
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{
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iMod = sStrLen % 4;
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}
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else
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{
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iMod = sStrLen % 2;
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}
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for( pcSub = pcString + sStrLen - iMod; pcSub < pcString + sStrLen; pcSub++ )
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{
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pcRet[sRetIndex++] = *pcSub;
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}
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/* return string */
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if( HB_ISBYREF( 1 ) )
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{
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hb_storclen( pcRet, sRetIndex, 1 );
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}
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if( iNoRet )
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hb_retl( 0 );
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else
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hb_retclen( pcRet, sRetIndex );
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hb_xfree( pcRet );
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}
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else /* if (ISCHAR (1)) */
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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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if( iSwitch == DO_CHARSWAP_CHARSWAP )
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{
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pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG,
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CT_ERROR_CHARSWAP,
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NULL, HB_ERR_FUNCNAME, 0, EF_CANSUBSTITUTE,
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HB_ERR_ARGS_BASEPARAMS );
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}
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else
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{
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pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG,
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CT_ERROR_WORDSWAP,
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NULL, HB_ERR_FUNCNAME, 0, EF_CANSUBSTITUTE,
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HB_ERR_ARGS_BASEPARAMS );
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}
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}
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if( pSubst != NULL )
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hb_itemReturnRelease( pSubst );
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else if( iNoRet )
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hb_retl( 0 );
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else
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hb_retc_null();
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}
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}
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/* $DOC$
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* $FUNCNAME$
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* CHARSWAP()
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* $CATEGORY$
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* CT3 string functions
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* $ONELINER$
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* Swap neighbouring characters in a string
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* $SYNTAX$
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* CHARSWAP (<[@]cString>) -> cSwappedString
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* $ARGUMENTS$
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* <[@]cString> is the string that should be processed
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* $RETURNS$
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* <cSwappedString> a string where neighbour characters are swapped
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* $DESCRIPTION$
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* The CHARSWAP() function loops through <cString> in steps of two
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* characters and exchanges the characters from the odd and the even
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* positions.
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* By setting the CSETREF() switch to .T., one can omit the return value
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* of this functin, but one must then pass <cString> by reference.
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* $EXAMPLES$
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* ? CHARSWAP("0123456789") // "1032547698"
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* ? CHARSWAP("ABCDEFGHIJK") // "BADCFEHGJIK"
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* $TESTS$
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* CHARSWAP("0123456789") == "1032547698"
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* CHARSWAP("ABCDEFGHIJK") == "BADCFEHGJIK"
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* $STATUS$
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* Ready
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* $COMPLIANCE$
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* CHARSWAP() is compatible with CT3's CHARSWAP().
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* $PLATFORMS$
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* All
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* $FILES$
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* Source is charswap.c, library is libct.
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* $SEEALSO$
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* WORDSWAP(),CSETREF()
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* $END$
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*/
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HB_FUNC( CHARSWAP )
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{
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do_charswap( DO_CHARSWAP_CHARSWAP );
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}
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/* $DOC$
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* $FUNCNAME$
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* WORDSWAP()
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* $CATEGORY$
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* CT3 string functions
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* $ONELINER$
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* Swap neighbouring double characters in a string
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* $SYNTAX$
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* WORDSWAP (<[@]cString> [, <lSwapCharacters>]) -> cSwappedString
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* $ARGUMENTS$
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* <[@]cString> is the string that should be processed
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* [<lSwapCharacters>] specifies whether an additional swap should be
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* done within the double characters
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* Default: .F., no additional swap
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* $RETURNS$
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* <cSwappedString> a string where neighbouring double characters are
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* swapped
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* $DESCRIPTION$
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* The WORDSWAP() function loops through <cString> in steps of four
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* characters and exchanges the double characters from the first and
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* second position with the one from the third and forth position.
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* Additionally the function can perform a swap of the both char of
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* each double character.
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* By setting the CSETREF() switch to .T., one can omit the return value
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* of this functin, but one must then pass <cString> by reference.
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* $EXAMPLES$
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* ? WORDSWAP("1234567890") // "3412785690"
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* ? WORDSWAP("1234567890", .t.) // "4321876590"
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* $TESTS$
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* WORDSWAP("1234567890") == "3412785690"
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* WORDSWAP("1234567890", .t.) == "4321876590"
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* $STATUS$
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* Ready
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* $COMPLIANCE$
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* WORDSWAP() is compatible with CT3's WORDSWAP().
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* $PLATFORMS$
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* All
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* $FILES$
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* Source is charswap.c, library is libct.
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* $SEEALSO$
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* CHARSWAP(),CSETREF()
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* $END$
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*/
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HB_FUNC( WORDSWAP )
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{
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do_charswap( DO_CHARSWAP_WORDSWAP );
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}
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