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/*
Copyright (C) 1996 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 2, 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, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "f77-fcn.h"
#include "lo-error.h"
#include "mach-info.h"
extern "C"
{
double F77_FCN (d1mach, D1MACH) (const int&);
}
oct_mach_info *oct_mach_info::instance = 0;
union equiv
{
double d;
int i[2];
};
struct
float_params
{
oct_mach_info::float_format fp_fmt;
equiv fp_par[4];
};
#define INIT_FLT_PAR(fp, fmt, sm1, sm2, lrg1, lrg2, rt1, rt2, dv1, dv2) \
do \
{ \
fp.fp_fmt = (fmt); \
fp.fp_par[0].i[0] = (sm1); fp.fp_par[0].i[1] = (sm2); \
fp.fp_par[1].i[0] = (lrg1); fp.fp_par[1].i[1] = (lrg2); \
fp.fp_par[2].i[0] = (rt1); fp.fp_par[2].i[1] = (rt2); \
fp.fp_par[3].i[0] = (dv1); fp.fp_par[3].i[1] = (dv2); \
} \
while (0)
static int
equiv_compare (const equiv *std, const equiv *v, int len)
{
int i;
for (i = 0; i < len; i++)
if (v[i].i[0] != std[i].i[0] || v[i].i[1] != std[i].i[1])
return 0;
return 1;
}
void
oct_mach_info::init_float_format (void)
{
float_params fp[5];
INIT_FLT_PAR (fp[0], oct_mach_info::ieee_big_endian,
1048576, 0,
2146435071, -1,
1017118720, 0,
1018167296, 0);
INIT_FLT_PAR (fp[1], oct_mach_info::ieee_little_endian,
0, 1048576,
-1, 2146435071,
0, 1017118720,
0, 1018167296);
INIT_FLT_PAR (fp[2], oct_mach_info::vax_d,
128, 0,
-32769, -1,
9344, 0,
9344, 0);
INIT_FLT_PAR (fp[3], oct_mach_info::vax_g,
16, 0,
-32769, -1,
15552, 0,
15552, 0);
INIT_FLT_PAR (fp[4], oct_mach_info::unknown,
0, 0,
0, 0,
0, 0,
0, 0);
equiv mach_fp_par[4];
mach_fp_par[0].d = F77_FCN (d1mach, D1MACH) (1);
mach_fp_par[1].d = F77_FCN (d1mach, D1MACH) (2);
mach_fp_par[2].d = F77_FCN (d1mach, D1MACH) (3);
mach_fp_par[3].d = F77_FCN (d1mach, D1MACH) (4);
int i = 0;
do
{
if (equiv_compare (fp[i].fp_par, mach_fp_par, 4))
{
native_float_fmt = fp[i].fp_fmt;
break;
}
}
while (fp[++i].fp_fmt != oct_mach_info::unknown);
}
void
oct_mach_info::ten_little_endians (void)
{
// Are we little or big endian? From Harbison & Steele.
union
{
long l;
char c[sizeof (long)];
} u;
u.l = 1;
big_chief = (u.c[sizeof (long) - 1] == 1);
}
oct_mach_info::oct_mach_info (void)
{
init_float_format ();
ten_little_endians ();
}
oct_mach_info::float_format
oct_mach_info::native_float_format (void)
{
if (! instance)
instance = new oct_mach_info ();
return instance->native_float_fmt;
}
bool
oct_mach_info::words_big_endian (void)
{
if (! instance)
instance = new oct_mach_info ();
return instance->big_chief;
}
bool
oct_mach_info::words_little_endian (void)
{
if (! instance)
instance = new oct_mach_info ();
return ! instance->big_chief;
}
oct_mach_info::float_format
oct_mach_info::string_to_float_format (const string& s)
{
oct_mach_info::float_format retval = oct_mach_info::unknown;
if (s == "native" || s == "n")
retval = oct_mach_info::native;
else if (s == "ieee-be" || s == "b")
retval = oct_mach_info::ieee_big_endian;
else if (s == "ieee-le" || s == "l")
retval = oct_mach_info::ieee_little_endian;
else if (s == "vaxd" || s == "d")
retval = oct_mach_info::vax_d;
else if (s == "vaxg" || s == "g")
retval = oct_mach_info::vax_g;
else if (s == "cray" || s == "c")
retval = oct_mach_info::cray;
else if (s == "unknown")
retval = oct_mach_info::unknown;
else
(*current_liboctave_error_handler)
("invalid architecture type specified");
return retval;
}
string
oct_mach_info::float_format_as_string (float_format flt_fmt)
{
string retval = "unknown";
switch (flt_fmt)
{
case native:
retval = "native";
break;
case ieee_big_endian:
retval = "ieee_big_endian";
break;
case ieee_little_endian:
retval = "ieee_little_endian";
break;
case vax_d:
retval = "vax_d_float";
break;
case vax_g:
retval = "vax_g_float";
break;
case cray:
retval = "cray";
break;
default:
break;
}
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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