utility.c

VC嵌入式CLips专家系统,实现战场环境的目标识别

        {
         theString = ExpandStringWithChar(theEnv,'\\',theString,&pos,&max,max+80);
         theString = ExpandStringWithChar(theEnv,str[i],theString,&pos,&max,max+80);
        }
      else
        { theString = ExpandStringWithChar(theEnv,str[i],theString,&pos,&max,max+80); }
      i++;
     }

   theString = ExpandStringWithChar(theEnv,'"',theString,&pos,&max,max+80);

   thePtr = EnvAddSymbol(theEnv,theString);
   rm(theEnv,theString,max);
   return(ValueToString(thePtr));
  }

/***********************************************************/
/* AppendStrings: Appends two strings together. The string */
/*   created is added to the SymbolTable, so it is not     */
/*   necessary to deallocate the string returned.          */
/***********************************************************/
globle char *AppendStrings(
  void *theEnv,
  char *str1,
  char *str2)
  {
   int pos = 0;
   unsigned max = 0;
   char *theString = NULL;
   void *thePtr;

   theString = AppendToString(theEnv,str1,theString,&pos,&max);
   theString = AppendToString(theEnv,str2,theString,&pos,&max);

   thePtr = EnvAddSymbol(theEnv,theString);
   rm(theEnv,theString,max);
   return(ValueToString(thePtr));
  }

/******************************************************/
/* AppendToString: Appends a string to another string */
/*   (expanding the other string if necessary).       */
/******************************************************/
globle char *AppendToString(
  void *theEnv,
  char *appendStr,
  char *oldStr,
  int *oldPos,
  unsigned *oldMax)
  {
   size_t length;

   /*=========================================*/
   /* Expand the old string so it can contain */
   /* the new string (if necessary).          */
   /*=========================================*/

   length = strlen(appendStr);
   if (length + *oldPos + 1 > *oldMax)
     {
      oldStr = (char *) genrealloc(theEnv,oldStr,(unsigned) *oldMax,(unsigned) length + *oldPos + 1);
      *oldMax = length + *oldPos + 1;
     }

   /*==============================================================*/
   /* Return NULL if the old string was not successfully expanded. */
   /*==============================================================*/

   if (oldStr == NULL) { return(NULL); }

   /*===============================================*/
   /* Append the new string to the expanded string. */
   /*===============================================*/

   strcpy(&oldStr[*oldPos],appendStr);
   *oldPos += (int) length;

   /*============================================================*/
   /* Return the expanded string containing the appended string. */
   /*============================================================*/

   return(oldStr);
  }

/*******************************************************/
/* AppendNToString: Appends a string to another string */
/*   (expanding the other string if necessary). Only a */
/*   specified number of characters are appended from  */
/*   the string.                                       */
/*******************************************************/
globle char *AppendNToString(
  void *theEnv,
  char *appendStr,
  char *oldStr,
  unsigned length,
  int *oldPos,
  unsigned *oldMax)
  {
   unsigned lengthWithEOS;

   /*====================================*/
   /* Determine the number of characters */
   /* to be appended from the string.    */
   /*====================================*/

   if (appendStr[length-1] != '\0') lengthWithEOS = length + 1;
   else lengthWithEOS = length;

   /*=========================================*/
   /* Expand the old string so it can contain */
   /* the new string (if necessary).          */
   /*=========================================*/

   if (lengthWithEOS + *oldPos > *oldMax)
     {
      oldStr = (char *) genrealloc(theEnv,oldStr,(unsigned) *oldMax,(unsigned) *oldPos + lengthWithEOS);
      *oldMax = (unsigned) *oldPos + lengthWithEOS;
     }

   /*==============================================================*/
   /* Return NULL if the old string was not successfully expanded. */
   /*==============================================================*/

   if (oldStr == NULL) { return(NULL); }

   /*==================================*/
   /* Append N characters from the new */
   /* string to the expanded string.   */
   /*==================================*/

   strncpy(&oldStr[*oldPos],appendStr,(STD_SIZE) length);
   *oldPos += (int) (lengthWithEOS - 1);
   oldStr[*oldPos] = '\0';

   /*============================================================*/
   /* Return the expanded string containing the appended string. */
   /*============================================================*/

   return(oldStr);
  }

/*******************************************************/
/* ExpandStringWithChar: Adds a character to a string, */
/*   reallocating space for the string if it needs to  */
/*   be enlarged. The backspace character causes the   */
/*   size of the string to reduced if it is "added" to */
/*   the string.                                       */
/*******************************************************/
globle char *ExpandStringWithChar(
  void *theEnv,
  int inchar,
  char *str,
  int *pos,
  unsigned *max,
  unsigned newSize)
  {
   if ((*pos + 1) >= (int) *max)
     {
      str = (char *) genrealloc(theEnv,str,*max,newSize);
      *max = newSize;
     }

  if (inchar != '\b')
    {
     str[*pos] = (char) inchar;
     (*pos)++;
     str[*pos] = '\0';
    }
  else
    {
     if (*pos > 0) (*pos)--;
     str[*pos] = '\0';
    }

   return(str);
  }

/*****************************************************************/
/* AddFunctionToCallList: Adds a function to a list of functions */
/*   which are called to perform certain operations (e.g. clear, */
/*   reset, and bload functions).                                */
/*****************************************************************/
globle struct callFunctionItem *AddFunctionToCallList(
  void *theEnv,
  char *name,
  int priority,
  void (*func)(void *),
  struct callFunctionItem *head,
  intBool environmentAware)
  {
   struct callFunctionItem *newPtr, *currentPtr, *lastPtr = NULL;

   newPtr = get_struct(theEnv,callFunctionItem);

   newPtr->name = name;
   newPtr->func = func;
   newPtr->priority = priority;
   newPtr->environmentAware = (short) environmentAware;

   if (head == NULL)
     {
      newPtr->next = NULL;
      return(newPtr);
     }

   currentPtr = head;
   while ((currentPtr != NULL) ? (priority < currentPtr->priority) : FALSE)
     {
      lastPtr = currentPtr;
      currentPtr = currentPtr->next;
     }

   if (lastPtr == NULL)
     {
      newPtr->next = head;
      head = newPtr;
     }
   else
     {
      newPtr->next = currentPtr;
      lastPtr->next = newPtr;
     }

   return(head);
  }

/*****************************************************************/
/* RemoveFunctionFromCallList: Removes a function from a list of */
/*   functions which are called to perform certain operations    */
/*   (e.g. clear, reset, and bload functions).                   */
/*****************************************************************/
globle struct callFunctionItem *RemoveFunctionFromCallList(
  void *theEnv,
  char *name,
  struct callFunctionItem *head,
  int *found)
  {
   struct callFunctionItem *currentPtr, *lastPtr;

   *found = FALSE;
   lastPtr = NULL;
   currentPtr = head;

   while (currentPtr != NULL)
     {
      if (strcmp(name,currentPtr->name) == 0)
        {
         *found = TRUE;
         if (lastPtr == NULL)
           { head = currentPtr->next; }
         else
           { lastPtr->next = currentPtr->next; }

         rtn_struct(theEnv,callFunctionItem,currentPtr);
         return(head);
        }

      lastPtr = currentPtr;
      currentPtr = currentPtr->next;
     }

   return(head);
  }

/**************************************************************/
/* DeallocateCallList: Removes all functions from a list of   */
/*   functions which are called to perform certain operations */
/*   (e.g. clear, reset, and bload functions).                */
/**************************************************************/
globle void DeallocateCallList(
  void *theEnv,
  struct callFunctionItem *theList)
  {
   struct callFunctionItem *tmpPtr, *nextPtr;
   
   tmpPtr = theList;
   while (tmpPtr != NULL)
     {
      nextPtr = tmpPtr->next;
      rtn_struct(theEnv,callFunctionItem,tmpPtr);
      tmpPtr = nextPtr;
     }
  }

/*****************************************/
/* ItemHashValue: Returns the hash value */
/*   for the specified value.            */
/*****************************************/
globle unsigned ItemHashValue(
  void *theEnv,
  unsigned short theType,
  void *theValue,
  unsigned theRange)
  {
   switch(theType)
     {
      case FLOAT:
        return(HashFloat(ValueToDouble(theValue),theRange));

      case INTEGER:
        return(HashInteger(ValueToLong(theValue),theRange));

      case SYMBOL:
      case STRING:
#if OBJECT_SYSTEM
      case INSTANCE_NAME:
#endif
        return(HashSymbol(ValueToString(theValue),theRange));

      case MULTIFIELD:
        return(HashMultifield((struct multifield *) theValue,theRange));

#if DEFTEMPLATE_CONSTRUCT
      case FACT_ADDRESS:
        return(HashFact((struct fact *) theValue) % theRange);
#endif

      case EXTERNAL_ADDRESS:
#if OBJECT_SYSTEM
      case INSTANCE_ADDRESS:
#endif
        return(((unsigned) theValue) % theRange);
     }

   SystemError(theEnv,"UTILITY",1);
   return(0);
  }

/********************************************/
/* YieldTime: Yields time to a user-defined */
/*   function. Intended to allow foreground */
/*   application responsiveness when CLIPS  */
/*   is running in the background.          */
/********************************************/
void YieldTime(
  void *theEnv)
  {
   if ((UtilityData(theEnv)->YieldTimeFunction != NULL) && UtilityData(theEnv)->YieldFunctionEnabled)
     { (*UtilityData(theEnv)->YieldTimeFunction)(); }
  }
  
/********************************************/
/* SetGarbageCollectionHeuristics:         */
/********************************************/
short SetGarbageCollectionHeuristics(
  void *theEnv,
  short newValue)
  {
   short oldValue;

   oldValue = UtilityData(theEnv)->GarbageCollectionHeuristicsEnabled;
   
   UtilityData(theEnv)->GarbageCollectionHeuristicsEnabled = newValue;
   
   return(oldValue);
  }
 
/**********************************************/
/* EnvIncrementGCLocks: Increments the number */
/*   of garbage collection locks.             */
/**********************************************/
globle void EnvIncrementGCLocks(
  void *theEnv)
  {
   UtilityData(theEnv)->GarbageCollectionLocks++;
  }

/**********************************************/
/* EnvDecrementGCLocks: Decrements the number */
/*   of garbage collection locks.             */
/**********************************************/
globle void EnvDecrementGCLocks(
  void *theEnv)
  {
   if (UtilityData(theEnv)->GarbageCollectionLocks > 0)
     { UtilityData(theEnv)->GarbageCollectionLocks--; }
  }
 
/********************************************/
/* EnablePeriodicFunctions:         */
/********************************************/
short EnablePeriodicFunctions(
  void *theEnv,
  short value)
  {
   short oldValue;
   
   oldValue = UtilityData(theEnv)->PeriodicFunctionsEnabled;
   
   UtilityData(theEnv)->PeriodicFunctionsEnabled = value;
   
   return(oldValue);
  }
  
/********************************************/
/* EnableYieldFunction:         */
/********************************************/
short EnableYieldFunction(
  void *theEnv,
  short value)
  {
   short oldValue;
   
   oldValue = UtilityData(theEnv)->YieldFunctionEnabled;
   
   UtilityData(theEnv)->YieldFunctionEnabled = value;
   
   return(oldValue);
  }