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Diffstat (limited to 'stdlib/fpioconst.h')
| -rw-r--r-- | stdlib/fpioconst.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/stdlib/fpioconst.h b/stdlib/fpioconst.h new file mode 100644 index 0000000000..8edbdccb17 --- /dev/null +++ b/stdlib/fpioconst.h @@ -0,0 +1,52 @@ +/* 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 */ |