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1994-11-02
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/******************************************************************************
Copyright (c) 1992 Xerox Corporation. All rights reserved.
Portions of this code were written by Stephen White, aka ghond.
Use and copying of this software and preparation of derivative works based
upon this software are permitted. Any distribution of this software or
derivative works must comply with all applicable United States export
control laws. This software is made available AS IS, and Xerox Corporation
makes no warranty about the software, its performance or its conformity to
any specification. Any person obtaining a copy of this software is requested
to send their name and post office or electronic mail address to:
Pavel Curtis
Xerox PARC
3333 Coyote Hill Rd.
Palo Alto, CA 94304
Pavel@Xerox.Com
*****************************************************************************/
#ifndef Functions_h
#define Functions_h 1
#include "my-stdio.h"
#include "bf_register.h" /* as a check only -- register_bf_*() functions */
#include "bytecodes.h"
#include "config.h"
#include "structures.h"
typedef struct {
enum {BI_RAISE, BI_RETURN, BI_CALL} why;
union {
Var ret;
enum error err;
} u;
Byte func_pc;
void *func_data;
} package;
void register_bi_functions();
package make_error_pack(enum error err);
package make_var_pack(Var v);
package no_var_pack(void);
package make_call_pack(Byte func_pc, void *func_data);
typedef package (*bf_type)(Var, Byte, void *, Objid);
typedef void (*bf_write_type)(void *vdata);
typedef void *(*bf_read_type)(FILE *f);
struct bft_entry {
const char *name;
int minargs;
int maxargs;
var_type *prototype;
bf_type func;
bf_read_type read;
bf_write_type write;
};
#define MAX_FUNC 256
#define FUNC_NOT_FOUND MAX_FUNC
/* valid function numbers are 0 - 255, or a total of 256 of them.
function number 256 is reserved for func_not_found signal.
hence valid function numbers will fit in one byte but the
func_not_found signal will not */
extern const char *name_func_by_num(unsigned);
extern unsigned number_func_by_name(const char *);
extern unsigned register_function(const char *, int, int, bf_type, ...);
extern unsigned register_function_with_read_write(const char *, int, int,
bf_type, bf_read_type,
bf_write_type, ...);
extern void free_bf_table(void);
extern package call_bi_func(unsigned, Var, Byte, Objid, void *);
/* will free or use Var arglist */
extern void write_bi_func_data(void *vdata, Byte f_id);
extern int read_bi_func_data(FILE *f, Byte f_id, void **bi_func_state);
#endif
/* $Log: functions.h,v $
* Revision 1.8 1992/10/23 23:03:47 pavel
* Added copyright notice.
*
* Revision 1.7 1992/10/21 03:02:35 pavel
* Converted to use new automatic configuration system.
*
* Revision 1.6 1992/10/17 20:31:21 pavel
* Changed return-type of read_bi_func_data() from char to int, for systems
* that use unsigned chars.
*
* Revision 1.5 1992/08/14 00:00:56 pavel
* Converted to a typedef of `var_type' = `enum var_type'.
*
* Revision 1.4 1992/08/13 21:25:52 pjames
* Added register_bi_functions() which registers all bi_functions.
*
* Revision 1.3 1992/08/12 01:49:19 pjames
* Var_types in bft_entry is now a pointer instead of a preallocated array.
*
* Revision 1.2 1992/08/10 17:38:21 pjames
* Added func_pc and func_data to package struct. Built in functions now
* receive an Objid (progr) instead of a Parse_Info. Changed
* registration method to use var_args.
*
* Revision 1.1 1992/07/20 23:23:12 pavel
* Initial RCS-controlled version.
*/