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/* ieee-utils/read.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 <string.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_ieee_utils.h>
static int
lookup_string (const char * p, int * precision, int * rounding,
int * exception_mask) ;
int
gsl_ieee_read_mode_string (const char * description,
int * precision,
int * rounding,
int * exception_mask)
{
char * start ;
char * end;
char * p;
int precision_count = 0 ;
int rounding_count = 0 ;
int exception_count = 0 ;
start = (char *) malloc(strlen(description) + 1) ;
if (start == 0)
{
GSL_ERROR ("no memory to parse mode string", GSL_ENOMEM) ;
}
strcpy (start, description) ;
p = start ;
*precision = 0 ;
*rounding = 0 ;
*exception_mask = 0 ;
do {
int status ;
int new_precision, new_rounding, new_exception ;
end = strchr (p,',') ;
if (end)
{
*end = '\0' ;
do
{
end++ ; /* skip over trailing whitespace */
}
while (*end == ' ' || *end == ',') ;
}
new_precision = 0 ;
new_rounding = 0 ;
new_exception = 0 ;
status = lookup_string (p, &new_precision, &new_rounding, &new_exception) ;
if (status)
GSL_ERROR ("unrecognized GSL_IEEE_MODE string.\nValid settings are:\n\n"
" single-precision double-precision extended-precision\n"
" round-to-nearest round-down round-up round-to-zero\n"
" mask-invalid mask-denormalized mask-division-by-zero\n"
" mask-overflow mask-underflow mask-all\n"
" trap-common trap-inexact\n"
"\n"
"separated by commas. "
"(e.g. GSL_IEEE_MODE=\"round-down,mask-underflow\")",
GSL_EINVAL) ;
if (new_precision)
{
*precision = new_precision ;
precision_count ++ ;
if (precision_count > 1)
GSL_ERROR ("attempted to set IEEE precision twice", GSL_EINVAL) ;
}
if (new_rounding)
{
*rounding = new_rounding ;
rounding_count ++ ;
if (rounding_count > 1)
GSL_ERROR ("attempted to set IEEE rounding mode twice", GSL_EINVAL) ;
}
if (new_exception)
{
*exception_mask |= new_exception ;
exception_count ++ ;
}
p = end ;
} while (end && *p != '\0') ;
free(start) ;
return GSL_SUCCESS ;
}
static int
lookup_string (const char * p, int * precision, int * rounding,
int * exception_mask)
{
if (strcmp(p,"single-precision") == 0)
{
*precision = GSL_IEEE_SINGLE_PRECISION ;
}
else if (strcmp(p,"double-precision") == 0)
{
*precision = GSL_IEEE_DOUBLE_PRECISION ;
}
else if (strcmp(p,"extended-precision") == 0)
{
*precision = GSL_IEEE_EXTENDED_PRECISION ;
}
else if (strcmp(p,"round-to-nearest") == 0)
{
*rounding = GSL_IEEE_ROUND_TO_NEAREST ;
}
else if (strcmp(p,"round-down") == 0)
{
*rounding = GSL_IEEE_ROUND_DOWN ;
}
else if (strcmp(p,"round-up") == 0)
{
*rounding = GSL_IEEE_ROUND_UP ;
}
else if (strcmp(p,"round-to-zero") == 0)
{
*rounding = GSL_IEEE_ROUND_TO_ZERO ;
}
else if (strcmp(p,"mask-all") == 0)
{
*exception_mask = GSL_IEEE_MASK_ALL ;
}
else if (strcmp(p,"mask-invalid") == 0)
{
*exception_mask = GSL_IEEE_MASK_INVALID ;
}
else if (strcmp(p,"mask-denormalized") == 0)
{
*exception_mask = GSL_IEEE_MASK_DENORMALIZED ;
}
else if (strcmp(p,"mask-division-by-zero") == 0)
{
*exception_mask = GSL_IEEE_MASK_DIVISION_BY_ZERO ;
}
else if (strcmp(p,"mask-overflow") == 0)
{
*exception_mask = GSL_IEEE_MASK_OVERFLOW ;
}
else if (strcmp(p,"mask-underflow") == 0)
{
*exception_mask = GSL_IEEE_MASK_UNDERFLOW ;
}
else if (strcmp(p,"trap-inexact") == 0)
{
*exception_mask = GSL_IEEE_TRAP_INEXACT ;
}
else if (strcmp(p,"trap-common") == 0)
{
return 0 ;
}
else
{
return 1 ;
}
return 0 ;
}
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