glibc/stdlib/fpioconst.h
Roland McGrath 49e522bfb8 Tue Mar 21 00:14:27 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* locale/loadlocale.c (_nl_load_locale): If LOCALE/LC_* is a
 	directory, open LOCALE/LC_*/SYS_LC_* instead.

	* stdio/fpioconst.c, stdio/fpioconst.h, stdio/gmp-impl.h,
	stdio/gmp.h, stdio/longlong.h, stdio/mp_clz_tab.c,
	stdio/gen-mpn-copy: Files moved to stdlib.
	* stdio/Makefile: All mpn stuff moved to stdlib/Makefile.
	* stdio/printf_fp.c: Use ../stdlib to find fpioconst.h and gmp
 	headers.
	* stdlib/strtod.c: Don't use ../stdio to find fpioconst.h and gmp
 	headers.
1995-03-21 07:58:50 +00:00

53 lines
1.9 KiB
C

/* Header file for constants used in floating point <-> decimal conversions.
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifndef _FPIOCONST_H
#define _FPIOCONST_H
#include <float.h>
#include "gmp.h"
/* These values are used by __printf_fp, where they are noncritical (if the
value is not large enough, it will just be slower); and by
strtof/strtod/strtold, where it is critical (it's used for overflow
detection).
XXX These should be defined in <float.h>. For the time being, we have the
IEEE754 values here. */
#define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
#define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */
#define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */
/* Table of powers of ten. This is used by __printf_fp and by
strtof/strtod/strtold. */
struct mp_power
{
const mp_limb *array; /* The array with the number representation. */
mp_size_t arraysize; /* Size of the array. */
int p_expo; /* Exponent of the number 10^(2^i). */
int m_expo; /* Exponent of the number 10^-(2^i-1). */
};
extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1];
#endif /* fpioconst.h */