/*
 *  Copyright 2003,2016 Ronald S. Burkey <info@sandroid.org>
 *
 *  This file is part of yaAGC.
 *
 *  yaAGC 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.
 *
 *  yaAGC 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 yaAGC; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Filename:	ParseCADR.c
 *  Purpose:	Assembles the CADR and FCADR pseudo-ops.
 *  Mods:	04/27/03 RSB.	Began.
 *              2012-09-25 JL   Handle arguments like "DUMMYJOB + 2",
 *                		i.e. Mod1=+, Mod2=2.
 *              2016-08-21 RSB  Adjusted for --block1.
 *              2016-08-22 RSB	Removed the block 1 pre-operation '-'
 *                		adjustment and put it in Pass.c
 *                		instead.
 *              2016-10-20 RSB  When the operand for CADR was a simple number, it was
 *                              incorrectly treating it as an offset to the current location
 *                              rather than a full pseudo-address.
 */

#include "yaYUL.h"
#include <stdlib.h>
#include <math.h>
#include <string.h>

int
ParseFCADR(ParseInput_t *InRecord, ParseOutput_t *OutRecord)
{
  return (ParseCADR(InRecord, OutRecord));
}

//-------------------------------------------------------------------------
// Returns non-zero on unrecoverable error.
int
ParseCADR(ParseInput_t *InRecord, ParseOutput_t *OutRecord)
{
  Address_t Address;
  int Value, i;

  IncPc(&InRecord->ProgramCounter, 1, &OutRecord->ProgramCounter);
  if (!OutRecord->ProgramCounter.Invalid && OutRecord->ProgramCounter.Overflow)
    {
      strcpy(OutRecord->ErrorMessage, "Next code may overflow storage.");
      OutRecord->Warning = 1;
    }

  OutRecord->EBank = InRecord->EBank;
  OutRecord->SBank = InRecord->SBank;
  OutRecord->NumWords = 1;
  OutRecord->Words[0] = 0;

  if (InRecord->Extend && !InRecord->IndexValid)
    {
      strcpy(OutRecord->ErrorMessage, "Illegally preceded by EXTEND.");
      OutRecord->Fatal = 1;
      OutRecord->Extend = 0;
    }

  if (InRecord->IndexValid)
    {
      strcpy(OutRecord->ErrorMessage, "Illegally preceded by INDEX.");
      OutRecord->Fatal = 1;
      OutRecord->IndexValid = 0;
    }

  i = GetOctOrDec(InRecord->Operand, &Value);
  if ((Block1 || blk2) && (InRecord->Operand == NULL || *InRecord->Operand == 0))
    {
      Address = InRecord->ProgramCounter;
      goto DoIt;
    }

  if (!i && *InRecord->Mod1 == 0)
    {
      //IncPc(&InRecord->ProgramCounter, Value, &Address);
      PseudoToStruct(Value, &Address);
      DoIt:;
      if (Address.Invalid)
        {
          strcpy(OutRecord->ErrorMessage, "Destination address not resolved.");
          OutRecord->Fatal = 1;
          return (0);
        }

      if (!Address.Address)
        {
          strcpy(OutRecord->ErrorMessage,
              "Destination is not a memory address.");
          OutRecord->Fatal = 1;
          return (0);
        }

      if (Block1)
        {
          int address, isLiteralNumber = 0;
          char *s;
          unsigned offset;
          if (1 == sscanf(InRecord->Mod1, "+%o", &offset))
            OpcodeOffset = offset;
          isLiteralNumber = 1;
          for (s = InRecord->Operand; *s; s++)
            if (*s > '9' || *s < '0')
              {
                isLiteralNumber = 0;
                break;
              }
          if (isLiteralNumber)
            sscanf(InRecord->Operand, "%o", &address);
          else if (Address.Fixed)
            {
              if (Address.FB)
                address = (Address.SReg & 01777) | (Address.FB << 10);
              else
                address = Address.SReg;
            }
          else
            address = Address.Value;
          OutRecord->Words[0] = 077777 & address;
        }
      else
        {
          if (!Address.Fixed || !Address.Banked)
            {
              strcpy(OutRecord->ErrorMessage, "Destination not in an F-bank.");
              OutRecord->Fatal = 1;
              return (0);
            }

          // If this is a superbank, we massage a little more to get into the 15-bit
          // address range.
          if (Address.Super && Address.FB >= 030)
            Address.Value -= 010 * 02000;

          if (Address.Value < 010000 || Address.Value > 0107777)
            {
              strcpy(OutRecord->ErrorMessage,
                  "Destination address out of range.");
              OutRecord->Fatal = 1;
              return (0);
            }

          OutRecord->Words[0] = Address.Value - 010000;
        }
    }
  else
    {
      char args[32];

      args[0] = '\0';

      if (*InRecord->Mod1)
        strcpy(args, InRecord->Mod1);

      // Handle arguments like "DUMMYJOB + 2", i.e. Mod1=+, Mod2=2.
      if (*InRecord->Mod2)
        strcat(args, InRecord->Mod2);

      // The operand is NOT a number.  Presumably, it's a symbol.
      i = FetchSymbolPlusOffset(&InRecord->ProgramCounter, InRecord->Operand,
          args, &Address);
      if (!i)
        goto DoIt;
      sprintf(OutRecord->ErrorMessage, "Symbol \"%s\" undefined or offset bad",
          InRecord->Operand);
      OutRecord->Fatal = 1;
    }

  return (0);
}