update packages

[CreaPhase.git] / octave_packages / m / miscellaneous / computer.m

diff --git a/octave_packages/m/miscellaneous/computer.m b/octave_packages/m/miscellaneous/computer.m
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+## Copyright (C) 2004-2012 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 (@code{"B"} for big-endian or
+## @code{"L"} for little-endian).
+##
+## If the argument @code{"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 = strsplit (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 ())
+%! && computer () == octave_config_info ("canonical_host_type")));
+%!assert(ischar (computer ("arch")));
+%!error computer (2);