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Diffstat (limited to 'gsl-1.9/ieee-utils/read.c')
| -rw-r--r-- | gsl-1.9/ieee-utils/read.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/gsl-1.9/ieee-utils/read.c b/gsl-1.9/ieee-utils/read.c new file mode 100644 index 0000000..37227d5 --- /dev/null +++ b/gsl-1.9/ieee-utils/read.c @@ -0,0 +1,194 @@ +/* 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 ; +} |