/usr/share/calc/custhelp/register is in apcalc-common 2.12.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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register - set or print a custom register value
SYNOPSIS
custom("register", regnum[, value])
TYPES
regnum int
value any, &any
return any
DESCRIPTION
This custom function reads or sets a value of a custom register.
A custom register can hold any calc value.
Without a value arg, the register value is return. With a value
arg, the register is set with that value and the previous value
is returned.
The number of custom registers is defined at compile time.
There will be at least 32 registers although there could be more
added in the future. It may be deterimed by:
custom("sysinfo", "REGNUM_MAX")
The custom registers are initialized to 0 by the internal
function libcalc_call_me_first() during calc startup.
This custom interface is intented to make it easier to interface
with special purpose hardware.
EXAMPLE
> custom("register", 3)
0
> custom("register", 3, 45)
0
> custom("register", 3)
45
> custom("register", 7, 2i),
> custom("register", 8, 3i),
> custom("register", 7) * custom("register", 8)
-6
LIMITS
calc must be built with ALLOW_CUSTOM= -DCUSTOM
calc must be executed with a -C arg.
The regnum numbe bee an integer >= 0 and < REGNUM_MAX where
REGNUM_MAX is a compile time constant that is >= 32.
LIBRARY
none
SEE ALSO
custom
## Copyright (C) 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.
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
##
## @(#) $Revision: 29.2 $
## @(#) $Id: register,v 29.2 2007/07/05 19:35:20 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/custom/RCS/register,v $
##
## Under source code control: 2005/02/04 22:39:50
## File existed as early as: 2005
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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