1 /* Header file for constants used in floating point <-> decimal conversions. 2 Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _FPIOCONST_H 21 #define _FPIOCONST_H 22 23 #include <float.h> 24 #include <math.h> 25 #include "gmp.h" 26 27 28 /* These values are used by __printf_fp, where they are noncritical (if the 29 value is not large enough, it will just be slower); and by 30 strtof/strtod/strtold, where it is critical (it's used for overflow 31 detection). 32 33 XXX These should be defined in <float.h>. For the time being, we have the 34 IEEE754 values here. */ 35 36 #ifndef __NO_LONG_DOUBLE_MATH 37 # define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */ 38 #else 39 # define LDBL_MAX_10_EXP_LOG 8 /* = floor(log_2(LDBL_MAX_10_EXP)) */ 40 #endif 41 #define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */ 42 #define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */ 43 44 45 /* The array with the number representation. */ 46 extern const mp_limb_t __tens[]; 47 48 /* Table of powers of ten. This is used by __printf_fp and by 49 strtof/strtod/strtold. */ 50 struct mp_power 51 { 52 size_t arrayoff; /* Offset in `__tens'. */ 53 mp_size_t arraysize; /* Size of the array. */ 54 int p_expo; /* Exponent of the number 10^(2^i). */ 55 int m_expo; /* Exponent of the number 10^-(2^i-1). */ 56 }; 57 extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1]; 58 59 /* The constants in the array `_fpioconst_pow10' have an offset. */ 60 #if BITS_PER_MP_LIMB == 32 61 # define _FPIO_CONST_OFFSET 2 62 #else 63 # define _FPIO_CONST_OFFSET 1 64 #endif 65 66 67 #endif /* fpioconst.h */ 68