| /* 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") ; |
| } |
| |
| |
| |
| |
| |