147 lines
4.3 KiB
C
147 lines
4.3 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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* CHARMIX() CT3 function
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*
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* Initial code: Copyright 1999-2001 Viktor Szakats <viktor.szakats@syenar.hu>
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*
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* CT3 conformity: 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 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 "ct.h"
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/* $DOC$
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* $FUNCNAME$
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* CHARMIX()
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* $CATEGORY$
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* CT3 string functions
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* $ONELINER$
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* Mix two strings
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* $SYNTAX$
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* CHARMIX (<cString1>[, <cString2>]) --> cMixedString
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* $ARGUMENTS$
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* <cString1> String that will be mixed with the characters from <cString2>
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* [<cString2>] String whose characters will be mixed with the one from
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* <cString1>.
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* Default: " " (string with one space char)
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* $RETURNS$
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* <cMixedString> Mixed string
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* $DESCRIPTION$
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* The CHARMIX() function mixes the strings <cString1> and <cString2>. To
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* do this it takes one character after the other alternatively from
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* <cString1> and <cString2> and puts them in the output string.
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* This procedure is stopped when the end of <cString1> is reached. If
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* <cString2> is shorter than <cString1>, the function will start at
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* the begin of <cString2> again. If on the other hand <cString2> is
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* longer than <cString1>, the surplus characters will be omitted.
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* $EXAMPLES$
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* ? CHARMIX("ABC", "123") // "A1B2C3"
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* ? CHARMIX("ABCDE", "12") // "A1B2C1D2E1"
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* ? CHARMIX("AB", "12345") // "A1B2"
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* ? CHARMIX("HELLO", " ") // "H E L L O "
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* ? CHARMIX("HELLO", "") // "HELLO"
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* $TESTS$
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* CHARMIX("ABC", "123") == "A1B2C3"
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* CHARMIX("ABCDE", "12") == "A1B2C1D2E1"
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* CHARMIX("AB", "12345") == "A1B2"
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* CHARMIX("HELLO", " ") == "H E L L O "
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* CHARMIX("HELLO", "") == "HELLO"
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* $STATUS$
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* Ready
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* $COMPLIANCE$
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* CHARMIX() is compatible with CT3's CHARMIX().
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* NOTE: CA-Tools version of CHARMIX() will hang
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* if the second parameter is an empty string, this version will not.
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* $PLATFORMS$
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* All
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* $FILES$
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* Source is charmix.c, library is ct3.
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* $SEEALSO$
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* CHAREVEN() CHARODD()
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* $END$
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*/
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HB_FUNC (CHARMIX)
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{
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if (ISCHAR (1))
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{
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char *pcString1 = hb_parc (1);
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char *pcString2, *pcResult;
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size_t sLen1 = hb_parclen (1);
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size_t sLen2, sPos1, sPos2, sResultPos;
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if (sLen1 == 0)
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{
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hb_retc ("");
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return;
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}
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if (ISCHAR (2))
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{
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pcString2 = hb_parc (2);
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sLen2 = hb_parclen (2);
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if (sLen2 == 0)
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{
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hb_retclen (pcString1, sLen1);
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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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pcString2 = " "; /* NOTE: The original CT3 uses " " as 2nd string
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if the 2nd param is not a string ! */
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sLen2 = 1;
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}
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pcResult = hb_xgrab (sLen1 * 2);
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sPos2 = sResultPos = 0;
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for (sPos1 = 0; sPos1 < sLen1;)
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{
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pcResult[sResultPos++] = pcString1[sPos1++];
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pcResult[sResultPos++] = pcString2[sPos2++];
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sPos2 %= sLen2;
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}
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hb_retclen (pcResult, sLen1 * 2);
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hb_xfree (pcResult);
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}
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else
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{
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hb_retc ("");
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}
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}
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