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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., 675 Mass Ave, Cambridge, MA 02139, 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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