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## Copyright (C) 2004-2013 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave 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
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{c}, @var{maxsize}, @var{endian}] =} computer ()
## @deftypefnx {Function File} {@var{arch} =} computer ("arch")
## Print or return a string of the form @var{cpu}-@var{vendor}-@var{os}
## that identifies the kind of computer Octave is running on. If invoked
## with an output argument, the value is returned instead of printed. For
## example:
##
## @example
## @group
## computer ()
## @print{} i586-pc-linux-gnu
##
## x = computer ()
## @result{} x = "i586-pc-linux-gnu"
## @end group
## @end example
##
## If two output arguments are requested, also return the maximum number
## of elements for an array.
##
## If three output arguments are requested, also return the byte order
## of the current system as a character (@qcode{"B"} for big-endian or
## @qcode{"L"} for little-endian).
##
## If the argument @qcode{"arch"} is specified, return a string
## indicating the architecture of the computer on which Octave is
## running.
## @end deftypefn
function [c, maxsize, endian] = computer (a)
if (nargin == 1 && ischar (a) && strcmpi (a, "arch"))
tmp = ostrsplit (octave_config_info ("canonical_host_type"), "-");
if (numel (tmp) == 4)
c = sprintf ("%s-%s-%s", tmp{4}, tmp{3}, tmp{1});
else
c = sprintf ("%s-%s", tmp{3}, tmp{1});
endif
elseif (nargin == 0)
msg = octave_config_info ("canonical_host_type");
if (strcmp (msg, "unknown"))
msg = "Hi Dave, I'm a HAL-9000";
endif
if (nargout == 0)
printf ("%s\n", msg);
else
c = msg;
if (strcmp (octave_config_info ("USE_64_BIT_IDX_T"), "true"))
maxsize = 2^63-1;
else
maxsize = 2^31-1;
endif
if (octave_config_info ("words_big_endian"))
endian = "B";
elseif (octave_config_info ("words_little_endian"))
endian = "L";
else
endian = "?";
endif
endif
else
print_usage ();
endif
endfunction
%!assert (ischar (computer ()))
%!assert (computer (), octave_config_info ("canonical_host_type"))
%!assert (ischar (computer ("arch")))
%!error computer (2)
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