/*
 * Written by Scott Auge scott_auge@yahoo.com sauge@amduus.com
 * Copyright (c) 2001 Amduus Information Works, Inc.  www.amduus.com
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Amduus Information Works
 *      Inc. and its contributors.
 * 4. Neither the name of Amduus Information Works, Inc. nor the names of 
 *    its contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY AMDUUS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AMDUUS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

DEF VAR RCSVersion AS CHARACTER INIT "$Header: /home/sauge/code/progress/misc/RCS/FilterChar.p,v 1.1 2001/11/30 16:43:29 sauge Exp sauge $" NO-UNDO.

/* Given input MessyString, allow only characters specified in AllowedChars */
/* to be returned in CleanString.                                           */

DEF INPUT PARAMETER MessyString   AS CHARACTER NO-UNDO.
DEF INPUT PARAMETER AllowedChars  AS CHARACTER NO-UNDO.
DEF OUTPUT PARAMETER CleanString  AS CHARACTER NO-UNDO.

DEF VAR i AS INTEGER NO-UNDO.
DEF VAR l AS INTEGER NO-UNDO.
DEF VAR c AS CHARACTER NO-UNDO.

ASSIGN l = LENGTH(MessyString)
       CleanString = "".

DO i = 1 TO l:

  ASSIGN c = SUBSTRING(MessyString, i, 1).
  IF INDEX(AllowedChars, c) > 0 THEN ASSIGN CleanString = CleanString + c.
  
END. /* DO i = 1 TO l */