/usr/include/clips/extnfunc.h is in libclips-dev 6.24-3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* "C" Language Integrated Production System */
/* */
/* CLIPS Version 6.24 06/05/06 */
/* */
/* EXTERNAL FUNCTIONS HEADER FILE */
/*******************************************************/
/*************************************************************/
/* Purpose: Routines for adding new user or system defined */
/* functions. */
/* */
/* Principal Programmer(s): */
/* Gary D. Riley */
/* */
/* Contributing Programmer(s): */
/* */
/* Revision History: */
/* */
/* 6.24: Renamed BOOLEAN macro type to intBool. */
/* */
/*************************************************************/
#ifndef _H_extnfunc
#define _H_extnfunc
#ifndef _H_symbol
#include "symbol.h"
#endif
#ifndef _H_expressn
#include "expressn.h"
#endif
#include "userdata.h"
struct FunctionDefinition
{
struct symbolHashNode *callFunctionName;
char *actualFunctionName;
char returnValueType;
int (*functionPointer)(void);
struct expr *(*parser)(void *,struct expr *,char *);
char *restrictions;
short int overloadable;
short int sequenceuseok;
short int environmentAware;
short int bsaveIndex;
struct FunctionDefinition *next;
struct userData *usrData;
};
#define ValueFunctionType(target) (((struct FunctionDefinition *) target)->returnValueType)
#define ExpressionFunctionType(target) (((struct FunctionDefinition *) ((target)->value))->returnValueType)
#define ExpressionFunctionPointer(target) (((struct FunctionDefinition *) ((target)->value))->functionPointer)
#define ExpressionFunctionCallName(target) (((struct FunctionDefinition *) ((target)->value))->callFunctionName)
#define ExpressionFunctionRealName(target) (((struct FunctionDefinition *) ((target)->value))->actualFunctionName)
#define PTIF (int (*)(void))
#define PTIEF (int (*)(void *))
/*==================*/
/* ENVIRONMENT DATA */
/*==================*/
#define EXTERNAL_FUNCTION_DATA 50
struct externalFunctionData
{
struct FunctionDefinition *ListOfFunctions;
struct FunctionHash **FunctionHashtable;
};
#define ExternalFunctionData(theEnv) ((struct externalFunctionData *) GetEnvironmentData(theEnv,EXTERNAL_FUNCTION_DATA))
#ifdef LOCALE
#undef LOCALE
#endif
#ifdef _EXTNFUNC_SOURCE_
#define LOCALE
#else
#define LOCALE extern
#endif
#ifdef LOCALE
struct FunctionHash
{
struct FunctionDefinition *fdPtr;
struct FunctionHash *next;
};
#define SIZE_FUNCTION_HASH 517
#endif
#if ENVIRONMENT_API_ONLY
#define DefineFunction(theEnv,a,b,c,d) EnvDefineFunction(theEnv,a,b,c,d)
#define DefineFunction2(theEnv,a,b,c,d,e) EnvDefineFunction2(theEnv,a,b,c,d,e)
#else
LOCALE int DefineFunction(char *,int,int (*)(void),char *);
LOCALE int DefineFunction2(char *,int,int (*)(void),char *,char *);
#endif
LOCALE void InitializeExternalFunctionData(void *);
LOCALE int EnvDefineFunction(void *,char *,int,
int (*)(void *),char *);
LOCALE int EnvDefineFunction2(void *,char *,int,
int (*)(void *),char *,char *);
LOCALE int DefineFunction3(void *,char *,int,
int (*)(void *),char *,char *,intBool);
LOCALE int AddFunctionParser(void *,char *,
struct expr *(*)( void *,struct expr *,char *));
LOCALE int RemoveFunctionParser(void *,char *);
LOCALE int FuncSeqOvlFlags(void *,char *,int,int);
LOCALE struct FunctionDefinition *GetFunctionList(void *);
LOCALE void InstallFunctionList(void *,struct FunctionDefinition *);
LOCALE struct FunctionDefinition *FindFunction(void *,char *);
LOCALE int GetNthRestriction(struct FunctionDefinition *,int);
LOCALE char *GetArgumentTypeName(int);
LOCALE int UndefineFunction(void *,char *);
LOCALE int GetMinimumArgs(struct FunctionDefinition *);
LOCALE int GetMaximumArgs(struct FunctionDefinition *);
#endif
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