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https://git.code.sf.net/p/mingw-w64/mingw-w64
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b190082731
As of Jan. 06 2023. Changelog from http://netlib.org/fp/changes (filtered): 20121220 dtoa.c and gdtoa.tgz: to avoid a possible one-time race when Infinity or NaN appear in decimal->binary conversions done in parallel threads, replace hexdig_init() with static initialization. 20131209 dtoa.c, gdtoa.tgz: when strtod computes its starting approximation, allow z to involve one more digit for IEEE arithmetic and two more digits for IBM-mainframe and VAX arithmetics. Thanks to Walter Qian (water.qian@gmail.com) for suggesting this change, which makes some conversions faster. 20151020 dtoa.c: add a test for dtoa() to return "1" under mode 4 when converting some very small powers of 10, such as 1e-322 with ndigits = 4 and 1e-319 with ndigits = 7 (examples provided by jay.foad@gmail.com). 20160219 gdtoa.tgz: Adjust gdtoa(...,mode,...) to assume "round near" when mode is 0 or 1. Make various tweaks to banish (useless) warnings from "gcc -Wall -Wextra". Thanks to Jarkko Hietaniemi <jhi@iki.fi> for advocating the latter exercise (and correcting a typo in README). 20160307 dtoa.c: fix glitches with floating-point values in hexadecimal notation: some values that should overflow to (appropriately signed) Infinity, such as 0x1p1025, were mishandled, and values greater than 0x1p-1075 and less than 0x1.0000000000001p-1075 where treated as zero rather than the smallest denormal number. gdtoa.tgz: fix a bug with hexadecimal input greater than the smallest denormal and less than the smallest denormal times the smallest number greater than one. In round-to-nearest values, such values should round to the smallest denormal rather than to zero. Thanks to Albert Chan <albertmcchan@yahoo.com> for bug reports. 20160325 dtoa.c: fix a bug whereby dtoa(...,mode,...) with, e.g., mode = 2 or 3 could return a string with trailing zeros, contrary to specification. An example provided by Albert Chan: dtoa(81320560005., 2, 10,...). gdtoa.tgz: fix the analogous bug in gdtoa/dtoa.c and gdtoa/gdtoa.c and apply the bug fix of 20151020 to gdtoa/dtoa.c. 20160429 dtoa.c, gdtoa.tgz (file dtoa.c): Fix a bug with dtoa mode 0 when Honor_FLT_ROUNDS is defined: with some inputs and nondefault rounding modes (e.g., 1.23 with round toward zero), the returned string was off by one. When the new 64-bit integer logic is used, the test in question is very unlikely to be used. This is another bug reported by Albert Chan. 20160505 dtoa.c: fix some glitches in strtod() when Honor_FLT_ROUNDS is defined: zero was returned for some decimal values that should have been rounded to +- the smallest denormal, and +-Infinity was returned for some hexadecimal strings with huge values that should have been rounded to +- the largest finite value. 20160506 gdtoa.tgz: analogous bug fixes to those of 20160505. 20180730 strtodg.c in gdtoa.c: fix a glitch, introduced 20160506, with some return values of +-Infinity: the STRTOG_Overflow bit was not set.
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 1998 by Lucent Technologies
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of Lucent or any of its entities
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not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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/* Please send bug reports to David M. Gay (dmg at acm dot org,
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* with " at " changed at "@" and " dot " changed to "."). */
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/* Modified by Danny Smith for inclusion in libmingwex.a
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Aug 2006 */
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#ifndef GDTOA_H_INCLUDED
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#define GDTOA_H_INCLUDED
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#include "gd_arith.h"
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#include <stddef.h> /* for size_t */
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#if defined(__MINGW32__) || defined(__MINGW64__)
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/* keep the 'Long' definition as 'long' for compatibility
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* with older/other software. long in w64 is 32 bits anyway..
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*/
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#define Long long /* Windows long is 32 bit */
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#undef NO_LONG_LONG /* we have long long type */
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#endif /* MinGW */
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#ifndef Long
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#define Long int
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#endif
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#ifndef ULong
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typedef unsigned Long ULong;
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#endif
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#ifndef UShort
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typedef unsigned short UShort;
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#endif
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enum { /* return values from strtodg */
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STRTOG_Zero = 0,
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STRTOG_Normal = 1,
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STRTOG_Denormal = 2,
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STRTOG_Infinite = 3,
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STRTOG_NaN = 4,
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STRTOG_NaNbits = 5,
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STRTOG_NoNumber = 6,
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STRTOG_Retmask = 7,
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/* The following may be or-ed into one of the above values. */
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STRTOG_Neg = 0x08, /* does not affect STRTOG_Inexlo or STRTOG_Inexhi */
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STRTOG_Inexlo = 0x10, /* returned result rounded toward zero */
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STRTOG_Inexhi = 0x20, /* returned result rounded away from zero */
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STRTOG_Inexact = 0x30,
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STRTOG_Underflow= 0x40,
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STRTOG_Overflow = 0x80
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};
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typedef struct
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FPI {
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int nbits;
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int emin;
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int emax;
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int rounding;
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int sudden_underflow;
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int int_max;
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} FPI;
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enum { /* FPI.rounding values: same as FLT_ROUNDS */
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FPI_Round_zero = 0,
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FPI_Round_near = 1,
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FPI_Round_up = 2,
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FPI_Round_down = 3
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern char* __dtoa (double d, int mode, int ndigits, int *decpt,
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int *sign, char **rve);
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extern char* __gdtoa (const FPI *fpi, int be, ULong *bits, int *kindp,
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int mode, int ndigits, int *decpt, char **rve);
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extern void __freedtoa (char *);
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extern float __strtof (const char *, char **);
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extern double __strtod (const char *, char **);
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extern long double __strtold (const char *, char **);
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extern int __strtodg (const char *, char **, FPI *, Long *, ULong *);
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extern char* __g__fmt (char*, char*, char*, int, ULong, size_t);
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extern char* __g_dfmt (char*, double*, int, size_t);
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extern char* __g_ffmt (char*, float*, int, size_t);
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extern char* __g_xfmt (char*, void*, int, size_t);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GDTOA_H_INCLUDED */
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