/usr/include/calc/custom.h is in apcalc-dev 2.12.5.0-1+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* custom - interface for custom software and hardware interfaces
*
* Copyright (C) 1999-2007 Landon Curt Noll
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc 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 Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* @(#) $Revision: 30.3 $
* @(#) $Id: custom.h,v 30.3 2007/07/10 17:54:03 chongo Exp $
* @(#) $Source: /usr/local/src/bin/calc/RCS/custom.h,v $
*
* Under source code control: 1997/03/03 04:53:08
* File existed as early as: 1997
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
/*
* Be careful what you put in this file, upper .c files include
* this file even when CUSTOM is not defined (ALLOW_CUSTOM is empty).
*
* Don't include anything, let the including .c file bring in:
*
* have_const.h
* value.h
*
* before they include this file.
*
* Keep this file down to a minimum. Don't put custom builtin funcion
* stuff in this file!
*/
#if !defined(CUSTOM_H)
#define CUSTOM_H
/*
* arg count definitons
*/
#define MAX_CUSTOM_ARGS 100 /* maximum number of custom arguments */
/*
* register count
*/
#define CUSTOM_REG_MAX 31 /* maximum custom register number */
/*
* custom function interface
*/
struct custom {
char *name; /* name of the custom builtin */
char *desc; /* very brief description of custom builtin */
short minargs; /* minimum number of arguments */
short maxargs; /* maximum number of arguments */
VALUE (*func)(char *name, int argc, VALUE **argv); /* custom func */
};
/*
* external declarations
*
* These are the required interfaces. The dummy.c stubs these interfaces too.
*/
E_FUNC VALUE custom(char*, int, VALUE**); /* master custom interface */
EXTERN BOOL allow_custom; /* TRUE => custom builtins allowed */
E_FUNC void showcustom(void); /* print custom functions */
E_FUNC void customhelp(char *); /* direct custom help */
EXTERN CONST struct custom cust[]; /* custom interface table */
E_FUNC void init_custreg(void); /* initialize custom registers */
#endif /* !CUSTOM_H */
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