multifld.c

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     }

   else
     {
      /*========================================*/
      /* Get a new segment with length equal to */
      /* the total length of all the arguments. */
      /*========================================*/

      val_arr = (DATA_OBJECT *) gm3(theEnv,(long) sizeof(DATA_OBJECT) * argCount);
      seg_size = 0;
      for(i = 1 ; i <= argCount ; i++ , expptr = expptr->nextArg)
        {
         EvaluateExpression(theEnv,expptr,&val_ptr);
         if (EvaluationData(theEnv)->EvaluationError)
           {
            SetpType(returnValue,MULTIFIELD);
            SetpDOBegin(returnValue,1);
            SetpDOEnd(returnValue,0);
            if (garbageSegment)
              { theMultifield = (struct multifield *) EnvCreateMultifield(theEnv,0L); }
            else theMultifield = (struct multifield *) CreateMultifield2(theEnv,0L);
            SetpValue(returnValue,(void *) theMultifield);
            rm3(theEnv,val_arr,(long) sizeof(DATA_OBJECT) * argCount);
            return;
           }
         SetpType(val_arr+i-1,GetType(val_ptr));
         if (GetType(val_ptr) == MULTIFIELD)
           {
            SetpValue(val_arr+i-1,GetpValue(&val_ptr));
            start = GetDOBegin(val_ptr);
            end = GetDOEnd(val_ptr);
           }
         else if (GetType(val_ptr) == RVOID)
           {
            SetpValue(val_arr+i-1,GetValue(val_ptr));
            start = 1;
            end = 0;
           }
         else
           {
            SetpValue(val_arr+i-1,GetValue(val_ptr));
            start = end = -1;
           }

         seg_size += (unsigned long) (end - start + 1);
         SetpDOBegin(val_arr+i-1,start);
         SetpDOEnd(val_arr+i-1,end);
        }

      if (garbageSegment)
        { theMultifield = (struct multifield *) EnvCreateMultifield(theEnv,seg_size); }
      else theMultifield = (struct multifield *) CreateMultifield2(theEnv,seg_size);

      /*========================================*/
      /* Copy each argument into new segment.  */
      /*========================================*/

      for(k=0,j=1; k < argCount;k++)
        {
         if (GetpType(val_arr+k) == MULTIFIELD)
           {
            start = GetpDOBegin(val_arr+k);
            end = GetpDOEnd(val_arr+k);
            orig_ptr = (struct multifield *) GetpValue(val_arr+k);
            for(i=start; i< end + 1; i++,j++)
              {
               SetMFType(theMultifield,j,(GetMFType(orig_ptr,i)));
               SetMFValue(theMultifield,j,(GetMFValue(orig_ptr,i)));
              }
           }
         else if (GetpType(val_arr+k) != MULTIFIELD)
           {
            SetMFType(theMultifield,j,(short) (GetpType(val_arr+k)));
            SetMFValue(theMultifield,j,(GetpValue(val_arr+k)));
            j++;
           }
        }

      /*=========================*/
      /* Return the new segment. */
      /*=========================*/

      SetpType(returnValue,MULTIFIELD);
      SetpDOBegin(returnValue,1);
      SetpDOEnd(returnValue,(long) seg_size);
      SetpValue(returnValue,(void *) theMultifield);
      rm3(theEnv,val_arr,(long) sizeof(DATA_OBJECT) * argCount);
      return;
     }
  }

/*************************************************************/
/* MultifieldDOsEqual: determines if two segments are equal. */
/*************************************************************/
globle intBool MultifieldDOsEqual(
  DATA_OBJECT_PTR dobj1,
  DATA_OBJECT_PTR dobj2)
  {
   long extent1,extent2; /* 6.04 Bug Fix */
   FIELD_PTR e1,e2;

   extent1 = GetpDOLength(dobj1);
   extent2 = GetpDOLength(dobj2);
   if (extent1 != extent2)
     { return(FALSE); }

   e1 = (FIELD_PTR) GetMFPtr(GetpValue(dobj1),GetpDOBegin(dobj1));
   e2 = (FIELD_PTR) GetMFPtr(GetpValue(dobj2),GetpDOBegin(dobj2));
   while (extent1 != 0)
     {
      if (e1->type != e2->type)
        { return(FALSE); }

      if (e1->value != e2->value)
        { return(FALSE); }

      extent1--;

      if (extent1 > 0)
        {
         e1++;
         e2++;
        }
     }
   return(TRUE);
  }

/******************************************************************/
/* MultifieldsEqual: Determines if two multifields are identical. */
/******************************************************************/
globle int MultifieldsEqual(
  struct multifield *segment1,
  struct multifield *segment2)
  {
   struct field *elem1;
   struct field *elem2;
   unsigned long length, i = 0;

   length = segment1->multifieldLength;
   if (length != segment2->multifieldLength)
     { return(FALSE); }

   elem1 = segment1->theFields;
   elem2 = segment2->theFields;

   /*==================================================*/
   /* Compare each field of both facts until the facts */
   /* match completely or the facts mismatch.          */
   /*==================================================*/

   while (i < length)
     {
      if (elem1[i].type != elem2[i].type)
        { return(FALSE); }

      if (elem1[i].type == MULTIFIELD)
        {
         if (MultifieldsEqual((struct multifield *) elem1[i].value,
                              (struct multifield *) elem2[i].value) == FALSE)
          { return(FALSE); }
        }
      else if (elem1[i].value != elem2[i].value)
        { return(FALSE); }

      i++;
     }
   return(TRUE);
  }

/************************************************************/
/* HashMultifield: Returns the hash value for a multifield. */
/************************************************************/
unsigned HashMultifield(
  struct multifield *theSegment,
  unsigned theRange)
  {
   unsigned long length, i;
   unsigned int tvalue;
   unsigned int count;
   struct field *fieldPtr;
   union
     {
      double fv;
      unsigned int liv;
     } fis;

   /*================================================*/
   /* Initialize variables for computing hash value. */
   /*================================================*/

   count = 0;
   length = theSegment->multifieldLength;
   fieldPtr = theSegment->theFields;

   /*====================================================*/
   /* Loop through each value in the multifield, compute */
   /* its hash value, and add it to the running total.   */
   /*====================================================*/

   for (i = 0;
        i < length;
        i++)
     {
      switch(fieldPtr[i].type)
         {
          case MULTIFIELD:
            count += HashMultifield((struct multifield *) fieldPtr[i].value,theRange);
            break;

          case FLOAT:
            fis.fv = ValueToDouble(fieldPtr[i].value);
            count += (fis.liv * (i + 29))  +
                     (int) ValueToDouble(fieldPtr[i].value);
            break;

          case INTEGER:
            count += (((int) ValueToLong(fieldPtr[i].value)) * (i + 29)) +
                             ValueToLong(fieldPtr[i].value);
            break;

          case FACT_ADDRESS:
          case EXTERNAL_ADDRESS:
#if OBJECT_SYSTEM
          case INSTANCE_ADDRESS:
#endif
            count += (unsigned int) (((int) fieldPtr[i].value) * (i + 29));
            break;

          case SYMBOL:
          case STRING:
#if OBJECT_SYSTEM
          case INSTANCE_NAME:
#endif
            tvalue = (unsigned) HashSymbol(ValueToString(fieldPtr[i].value),theRange);
            count += (unsigned) (tvalue * (i + 29));
            break;
         }
     }

   /*========================*/
   /* Return the hash value. */
   /*========================*/

   return(count);
  }

/**********************/
/* GetMultifieldList: */
/**********************/
globle struct multifield *GetMultifieldList(
  void *theEnv)
  {
   return(MultifieldData(theEnv)->ListOfMultifields);
  }

/***************************************/
/* ImplodeMultifield: C access routine */
/*   for the implode$ function.        */
/***************************************/
globle void *ImplodeMultifield(
  void *theEnv,
  DATA_OBJECT *value)
  {
   unsigned strsize = 0;
   long i, j;
   char *tmp_str;
   char *ret_str;
   void *rv;
   struct multifield *theMultifield;

   /*===================================================*/
   /* Determine the size of the string to be allocated. */
   /*===================================================*/

   theMultifield = (struct multifield *) GetpValue(value);
   for (i = GetpDOBegin(value) ; i <= GetpDOEnd(value) ; i++)
     {
      if (GetMFType(theMultifield,i) == FLOAT)
        {
         tmp_str = FloatToString(theEnv,ValueToDouble(GetMFValue(theMultifield,i)));
         strsize += strlen(tmp_str) + 1;
        }
      else if (GetMFType(theMultifield,i) == INTEGER)
        {
         tmp_str = LongIntegerToString(theEnv,ValueToLong(GetMFValue(theMultifield,i)));
         strsize += strlen(tmp_str) + 1;
        }
      else if (GetMFType(theMultifield,i) == STRING)
        {
         strsize += strlen(ValueToString(GetMFValue(theMultifield,i))) + 3;
         tmp_str = ValueToString(GetMFValue(theMultifield,i));
         while(*tmp_str)
           {
            if (*tmp_str == '"')
              { strsize++; }
            else if (*tmp_str == '\\') /* GDR 111599 #835 */
              { strsize++; }           /* GDR 111599 #835 */
            tmp_str++;
           }
        }
#if OBJECT_SYSTEM
      else if (GetMFType(theMultifield,i) == INSTANCE_NAME)
        { strsize += strlen(ValueToString(GetMFValue(theMultifield,i))) + 3; }
      else if (GetMFType(theMultifield,i) == INSTANCE_ADDRESS)
        { strsize += strlen(ValueToString(((INSTANCE_TYPE *)
                            GetMFValue(theMultifield,i))->name)) + 3; }
#endif

      else
        { strsize += strlen(ValueToString(GetMFValue(theMultifield,i))) + 1; }
     }

   /*=============================================*/
   /* Allocate the string and copy all components */
   /* of the MULTIFIELD variable to it.           */
   /*=============================================*/

   if (strsize == 0) return(EnvAddSymbol(theEnv,""));
   ret_str = (char *) gm2(theEnv,strsize);
   for(j=0, i=GetpDOBegin(value); i <= GetpDOEnd(value) ; i++)
     {
      /*============================*/
      /* Convert numbers to strings */
      /*============================*/

      if (GetMFType(theMultifield,i) == FLOAT)
        {
         tmp_str = FloatToString(theEnv,ValueToDouble(GetMFValue(theMultifield,i)));
         while(*tmp_str)
           {
            *(ret_str+j) = *tmp_str;
            j++, tmp_str++;
           }
        }
      else if (GetMFType(theMultifield,i) == INTEGER)
        {
         tmp_str = LongIntegerToString(theEnv,ValueToLong(GetMFValue(theMultifield,i)));
         while(*tmp_str)
           {
            *(ret_str+j) = *tmp_str;
            j++, tmp_str++;
           }
        }

      /*=======================================*/
      /* Enclose strings in quotes and preceed */
      /* imbedded quotes with a backslash      */
      /*=======================================*/

      else if (GetMFType(theMultifield,i) == STRING)
        {
         tmp_str = ValueToString(GetMFValue(theMultifield,i));
         *(ret_str+j) = '"';
         j++;
         while(*tmp_str)
           {
            if (*tmp_str == '"')
              {
               *(ret_str+j) = '\\';
               j++;
              }
            else if (*tmp_str == '\\') /* GDR 111599 #835 */
              {                        /* GDR 111599 #835 */
               *(ret_str+j) = '\\';    /* GDR 111599 #835 */
               j++;                    /* GDR 111599 #835 */
              }                        /* GDR 111599 #835 */
              
            *(ret_str+j) = *tmp_str;
            j++, tmp_str++;
           }
         *(ret_str+j) = '"';
         j++;
        }
#if OBJECT_SYSTEM
      else if (GetMFType(theMultifield,i) == INSTANCE_NAME)
        {
         tmp_str = ValueToString(GetMFValue(theMultifield,i));
         *(ret_str + j++) = '[';
         while(*tmp_str)
           {
            *(ret_str+j) = *tmp_str;
            j++, tmp_str++;
           }
         *(ret_str + j++) = ']';
        }
      else if (GetMFType(theMultifield,i) == INSTANCE_ADDRESS)
        {
         tmp_str = ValueToString(((INSTANCE_TYPE *) GetMFValue(theMultifield,i))->name);
         *(ret_str + j++) = '[';
         while(*tmp_str)
           {
            *(ret_str+j) = *tmp_str;
            j++, tmp_str++;
           }
         *(ret_str + j++) = ']';
        }
#endif
      else
        {
         tmp_str = ValueToString(GetMFValue(theMultifield,i));
         while(*tmp_str)
           {
            *(ret_str+j) = *tmp_str;
            j++, tmp_str++;
           }
         }
      *(ret_str+j) = ' ';
      j++;
     }
   *(ret_str+j-1) = '\0';

   /*====================*/
   /* Return the string. */
   /*====================*/

   rv = EnvAddSymbol(theEnv,ret_str);
   rm(theEnv,ret_str,strsize);
   return(rv);
  }