diff options
Diffstat (limited to 'generic/tclStrToD.c')
| -rwxr-xr-x | generic/tclStrToD.c | 51 |
1 files changed, 23 insertions, 28 deletions
diff --git a/generic/tclStrToD.c b/generic/tclStrToD.c index 5c932f6..89e97f3 100755 --- a/generic/tclStrToD.c +++ b/generic/tclStrToD.c @@ -1,21 +1,20 @@ /* *---------------------------------------------------------------------- * - * tclStrToD.c -- + * tclDouble.c -- * - * This file contains a TclStrToD procedure that handles conversion of - * string to double, with correct rounding even where extended precision - * is needed to achieve that. It also contains a TclDoubleDigits - * procedure that handles conversion of double to string (at least the - * significand), and several utility functions for interconverting - * 'double' and the integer types. + * This file contains a collection of procedures for managing + * conversions to/from floating-point in Tcl. They include + * TclParseNumber, which parses numbers from strings; TclDoubleDigits, + * which formats numbers into strings of digits, and procedures for + * interconversion among 'double' and 'mp_int' types. * * Copyright (c) 2005 by Kevin B. Kenny. All rights reserved. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclStrToD.c,v 1.1.2.32 2005/08/24 18:51:36 dgp Exp $ + * RCS: @(#) $Id: tclStrToD.c,v 1.1.2.33 2005/08/24 18:56:32 kennykb Exp $ * *---------------------------------------------------------------------- */ @@ -29,37 +28,33 @@ #include <ctype.h> #include <tommath.h> +/* + * Define TIP_114_FORMATS to accept 0b and 0o for binary and octal strings. + * Define KILL_OCTAL as well as TIP_114_FORMATS to suppress interpretation + * of numbers with leading zero as octal. (Ceterum censeo: numeros octonarios + * delendos esse.) + */ + #define TIP_114_FORMATS #undef KILL_OCTAL -#if 0 -/* Hack is out of date. tclInt.h unconditionally #include's errno.h - * (via tclPort.h). - */ /* - * The stuff below is a bit of a hack so that this file can be used in - * environments that include no UNIX, i.e. no errno: just arrange to use the - * errno from tclExecute.c here. + * This code supports (at least hypothetically), IBM, Cray, VAX and + * IEEE-754 floating point; of these, only IEEE-754 can represent NaN. + * IEEE-754 can be uniquely determined by radix and by the widths of + * significand and exponent. */ -#ifdef TCL_GENERIC_ONLY -# define NO_ERRNO_H -#endif - -#ifdef NO_ERRNO_H -extern int errno; /* Use errno from tclExecute.c. */ -# define ERANGE 34 -#endif -#endif - #if (FLT_RADIX == 2) && (DBL_MANT_DIG == 53) && (DBL_MAX_EXP == 1024) # define IEEE_FLOATING_POINT #endif /* - * gcc on x86 needs access to rounding controls. It is tempting to include - * fpu_control.h, but that file exists only on Linux; it is missing on Cygwin - * and MinGW. Most gcc-isms and ix86-isms are factored out here. + * gcc on x86 needs access to rounding controls, because of a questionable + * feature where it retains intermediate results as IEEE 'long double' values + * somewhat unpredictably. It is tempting to include fpu_control.h, but + * that file exists only on Linux; it is missing on Cygwin and MinGW. Most + * gcc-isms and ix86-isms are factored out here. */ #if defined(__GNUC__) && defined(__i386) |