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/* ieee-utils/env.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough
*
* This program 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 of the License, or (at
* your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <stdlib.h>
#include <gsl/gsl_ieee_utils.h>
#include <gsl/gsl_errno.h>
void
gsl_ieee_env_setup (void)
{
const char * p = getenv("GSL_IEEE_MODE") ;
int precision = 0, rounding = 0, exception_mask = 0 ;
int comma = 0 ;
if (p == 0) /* GSL_IEEE_MODE environment variable is not set */
return ;
if (*p == '\0') /* GSL_IEEE_MODE environment variable is empty */
return ;
gsl_ieee_read_mode_string (p, &precision, &rounding, &exception_mask) ;
gsl_ieee_set_mode (precision, rounding, exception_mask) ;
fprintf(stderr, "GSL_IEEE_MODE=\"") ;
/* Print string with a preceeding comma if the list has already begun */
#define PRINTC(x) do {if(comma) fprintf(stderr,","); fprintf(stderr,x); comma++ ;} while(0)
switch (precision)
{
case GSL_IEEE_SINGLE_PRECISION:
PRINTC("single-precision") ;
break ;
case GSL_IEEE_DOUBLE_PRECISION:
PRINTC("double-precision") ;
break ;
case GSL_IEEE_EXTENDED_PRECISION:
PRINTC("extended-precision") ;
break ;
}
switch (rounding)
{
case GSL_IEEE_ROUND_TO_NEAREST:
PRINTC("round-to-nearest") ;
break ;
case GSL_IEEE_ROUND_DOWN:
PRINTC("round-down") ;
break ;
case GSL_IEEE_ROUND_UP:
PRINTC("round-up") ;
break ;
case GSL_IEEE_ROUND_TO_ZERO:
PRINTC("round-to-zero") ;
break ;
}
if ((exception_mask & GSL_IEEE_MASK_ALL) == GSL_IEEE_MASK_ALL)
{
PRINTC("mask-all") ;
}
else if ((exception_mask & GSL_IEEE_MASK_ALL) == 0)
{
PRINTC("trap-common") ;
}
else
{
if (exception_mask & GSL_IEEE_MASK_INVALID)
PRINTC("mask-invalid") ;
if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
PRINTC("mask-denormalized") ;
if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
PRINTC("mask-division-by-zero") ;
if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
PRINTC("mask-overflow") ;
if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
PRINTC("mask-underflow") ;
}
if (exception_mask & GSL_IEEE_TRAP_INEXACT)
PRINTC("trap-inexact") ;
fprintf(stderr,"\"\n") ;
}
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