| /* 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 ; |
| } |