/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * STRFORMAT() function
 *
 * Copyright 1999 Victor Szel <info@szelvesz.hu>
 * www - http://www.harbour-project.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version, with one exception:
 *
 * The exception is that if you link the Harbour Runtime Library (HRL)
 * and/or the Harbour Virtual Machine (HVM) with other files to produce
 * an executable, this does not by itself cause the resulting executable
 * to be covered by the GNU General Public License. Your use of that
 * executable is in no way restricted on account of linking the HRL
 * and/or HVM code into it.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
 * their web site at http://www.gnu.org/).
 *
 */

#include "extend.h"

/*  $DOC$
 *  $FUNCNAME$
 *     StrFormat()
 *  $CATEGORY$
 *     String
 *  $ONELINER$
 *     ...
 *  $SYNTAX$
 *     StrFormat(<cMask>[, <cPar1>[, <cParn>[, ...]])
 *  $ARGUMENTS$
 *     <cMask> Holds the mask for the resulting string
 *     <cParn> Holds the strings to be inserted in the mask
 *             maximum 9 of them can be specified.
 *  $RETURNS$
 *     Return the mask with all the parameters inserted.
 *  $DESCRIPTION$
 *     String replacment, can be useful when writing international
 *     apps. You can separate the constant strings from the variable ones.
 *     Each %1 - %9 marks will be replaced with the appropriate parameter
 *     from the parameter list.
 *     Marks can be in any order, and can be duplicated.
 *     You can print "%" character with "%%".
 *  $EXAMPLES$
 *     StrFormat("Please insert disk %1 to drive %2", LTrim(Str(2)), "A:")
 *     StrFormat("This is %1 from %2", "Victor", "Hungary")
 *     StrFormat("%2 %1 %2", "Param1", "Param2")
 *  $TESTS$
 *     ? StrFormat("Please insert disk %1 to drive %2", LTrim(Str(2)), "A:")
 *     ? StrFormat("This is %1 from %2", "Victor", "Hungary")
 *     ? StrFormat("%2 %1 %2", "Param1", "Param2")
 *     ? StrFormat("Hello")
 *     ? StrFormat("%1 - %2", "one")
 *     ? StrFormat("%1 - %2", "one", "two")
 *     ? StrFormat("%2 - %1", "one", "two")
 *     ? StrFormat("%2 - %", "one", "two")
 *     ? StrFormat("%% - %", "one", "two")
 *     ? StrFormat("%9 - %", "one", "two")
 *  $STATUS$
 *     Done
 *  $COMPLIANCE$
 *     All platforms
 *  $SEEALSO$
 *
 *  $END$
 */

#define HB_STRFORMAT_PARNUM_MAX_ 9

HARBOUR HB_STRFORMAT (void) /* StrFormat() */
{
   char* pszMask = hb_parc(1);
   ULONG nMaskLen = hb_parclen(1);
   ULONG nMaskPos;
   ULONG nParNum = PCOUNT;
   ULONG nLenTable [HB_STRFORMAT_PARNUM_MAX_];
   char* pszVarTable [HB_STRFORMAT_PARNUM_MAX_];

   ULONG nRetValLen;
   char* pszRetVal;
   char* pszRetValSave;

   ULONG tmp;

   if (nParNum < 1)
   {
      hb_retc("");
      return;
   }

   nParNum--;

   if (nParNum > HB_STRFORMAT_PARNUM_MAX_) nParNum = HB_STRFORMAT_PARNUM_MAX_;

   for (tmp = 0; tmp < nParNum; tmp++)
   {
      nLenTable[tmp] = hb_parclen(tmp + 2);
      pszVarTable[tmp] = hb_parc(tmp + 2);
   }

   nMaskPos = 0;

   nRetValLen = 0;
   while (nMaskPos < nMaskLen)
   {
      if (pszMask[nMaskPos] == '%')
      {
         nMaskPos++;

         if (pszMask[nMaskPos] == '\0')
         {
            break;
         }
         else if (pszMask[nMaskPos] == '%')
         {
            nRetValLen++;
         }
         else if (pszMask[nMaskPos] >= '1' && pszMask[nMaskPos] <= (int)(nParNum + '0'))
         {
            nRetValLen += nLenTable[pszMask[nMaskPos] - '1'];
         }
         else
         {
            /* ; do nothing */
         }
      }
      else
      {
         nRetValLen++;
      }

      nMaskPos++;
   }

   nMaskPos = 0;

   pszRetVal = pszRetValSave = (char *) hb_xgrab(nRetValLen + 1);
   while (nMaskPos < nMaskLen)
   {
      if (pszMask[nMaskPos] == '%')
      {
         nMaskPos++;

         if (pszMask[nMaskPos] == '\0')
         {
            break;
         }
         else if (pszMask[nMaskPos] == '%')
         {
            *pszRetVal++ = pszMask[nMaskPos];
         }
         else if (pszMask[nMaskPos] >= '1' && pszMask[nMaskPos] <= (int)(nParNum + '0'))
         {
            ULONG nPos = pszMask[nMaskPos] - '1';

            memcpy(pszRetVal, pszVarTable[nPos], nLenTable[nPos]);
            pszRetVal += nLenTable[nPos];
         }
         else
         {
            /* ; do nothing */
         }
      }
      else
      {
         *pszRetVal++ = pszMask[nMaskPos];
      }

      nMaskPos++;
   }

   hb_retclen(pszRetValSave, nRetValLen);

   hb_xfree(pszRetValSave);
}