| 1 | /* Copyright (C) 2003 Manuel Novoa III |
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| 2 | * |
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| 3 | * This library is free software; you can redistribute it and/or |
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| 4 | * modify it under the terms of the GNU Library General Public |
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| 5 | * License as published by the Free Software Foundation; either |
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| 6 | * version 2 of the License, or (at your option) any later version. |
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| 7 | * |
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| 8 | * This library is distributed in the hope that it will be useful, |
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| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 11 | * Library General Public License for more details. |
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| 12 | * |
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| 13 | * You should have received a copy of the GNU Library General Public |
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| 14 | * License along with this library; if not, write to the Free |
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| 15 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 16 | */ |
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| 17 | |
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| 18 | /* Define a maximal floating point type, and the associated constants |
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| 19 | * that are defined for the floating point types in float.h. |
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| 20 | * |
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| 21 | * This is to support archs that are missing long double, or even double. |
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| 22 | */ |
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| 23 | |
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| 24 | #ifndef _UCLIBC_FPMAX_H |
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| 25 | #define _UCLIBC_FPMAX_H |
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| 26 | |
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| 27 | #ifndef _ISOC99_SOURCE |
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| 28 | #define _ISOC99_SOURCE 1 |
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| 29 | #endif |
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| 30 | |
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| 31 | #include <features.h> |
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| 32 | #include <float.h> |
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| 33 | |
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| 34 | #ifdef __UCLIBC_HAS_FLOATS__ |
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| 35 | |
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| 36 | #if defined(LDBL_MANT_DIG) |
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| 37 | |
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| 38 | typedef long double __fpmax_t; |
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| 39 | #define FPMAX_TYPE 3 |
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| 40 | |
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| 41 | #define FPMAX_MANT_DIG LDBL_MANT_DIG |
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| 42 | #define FPMAX_DIG LDBL_DIG |
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| 43 | #define FPMAX_EPSILON LDBL_EPSILON |
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| 44 | #define FPMAX_MIN_EXP LDBL_MIN_EXP |
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| 45 | #define FPMAX_MIN LDBL_MIN |
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| 46 | #define FPMAX_MIN_10_EXP LDBL_MIN_10_EXP |
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| 47 | #define FPMAX_MAX_EXP LDBL_MAX_EXP |
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| 48 | #define FPMAX_MAX LDBL_MAX |
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| 49 | #define FPMAX_MAX_10_EXP LDBL_MAX_10_EXP |
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| 50 | |
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| 51 | #elif defined(DBL_MANT_DIG) |
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| 52 | |
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| 53 | typedef double __fpmax_t; |
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| 54 | #define FPMAX_TYPE 2 |
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| 55 | |
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| 56 | #define FPMAX_MANT_DIG DBL_MANT_DIG |
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| 57 | #define FPMAX_DIG DBL_DIG |
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| 58 | #define FPMAX_EPSILON DBL_EPSILON |
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| 59 | #define FPMAX_MIN_EXP DBL_MIN_EXP |
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| 60 | #define FPMAX_MIN DBL_MIN |
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| 61 | #define FPMAX_MIN_10_EXP DBL_MIN_10_EXP |
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| 62 | #define FPMAX_MAX_EXP DBL_MAX_EXP |
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| 63 | #define FPMAX_MAX DBL_MAX |
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| 64 | #define FPMAX_MAX_10_EXP DBL_MAX_10_EXP |
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| 65 | |
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| 66 | #elif defined(FLT_MANT_DIG) |
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| 67 | |
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| 68 | typedef float __fpmax_t; |
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| 69 | #define FPMAX_TYPE 1 |
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| 70 | |
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| 71 | #define FPMAX_MANT_DIG FLT_MANT_DIG |
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| 72 | #define FPMAX_DIG FLT_DIG |
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| 73 | #define FPMAX_EPSILON FLT_EPSILON |
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| 74 | #define FPMAX_MIN_EXP FLT_MIN_EXP |
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| 75 | #define FPMAX_MIN FLT_MIN |
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| 76 | #define FPMAX_MIN_10_EXP FLT_MIN_10_EXP |
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| 77 | #define FPMAX_MAX_EXP FLT_MAX_EXP |
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| 78 | #define FPMAX_MAX FLT_MAX |
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| 79 | #define FPMAX_MAX_10_EXP FLT_MAX_10_EXP |
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| 80 | |
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| 81 | #else |
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| 82 | #error unable to determine appropriate type for __fpmax_t! |
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| 83 | #endif |
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| 84 | |
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| 85 | #ifndef DECIMAL_DIG |
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| 86 | |
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| 87 | #ifdef L___strtofpmax |
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| 88 | /* Emit warning only once. */ |
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| 89 | #warning DECIMAL_DIG is not defined! If you are using gcc, it may not be defining __STDC_VERSION__ as it should. |
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| 90 | #endif |
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| 91 | #if !defined(FLT_RADIX) || (FLT_RADIX != 2) |
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| 92 | #error unable to compensate for missing DECIMAL_DIG! |
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| 93 | #endif |
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| 94 | |
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| 95 | /* ceil (1 + #mantissa * log10 (FLT_RADIX)) */ |
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| 96 | #define DECIMAL_DIG (1 + (((FPMAX_MANT_DIG * 100) + 331) / 332)) |
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| 97 | |
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| 98 | #endif /* DECIMAL_DIG */ |
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| 99 | |
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| 100 | extern __fpmax_t __strtofpmax(const char *str, char **endptr, int exp_adjust); |
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| 101 | |
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| 102 | #ifdef __UCLIBC_HAS_XLOCALE__ |
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| 103 | extern __fpmax_t __strtofpmax_l(const char *str, char **endptr, int exp_adjust, |
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| 104 | __locale_t locale_arg); |
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| 105 | #endif |
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| 106 | |
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| 107 | #ifdef __UCLIBC_HAS_WCHAR__ |
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| 108 | extern __fpmax_t __wcstofpmax(const wchar_t *wcs, wchar_t **endptr, |
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| 109 | int exp_adjust); |
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| 110 | |
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| 111 | #ifdef __UCLIBC_HAS_XLOCALE__ |
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| 112 | extern __fpmax_t __wcstofpmax_l(const wchar_t *wcs, wchar_t **endptr, |
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| 113 | int exp_adjust, __locale_t locale_arg); |
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| 114 | #endif |
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| 115 | #endif /* __UCLIBC_HAS_WCHAR__ */ |
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| 116 | |
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| 117 | /* The following checks in an __fpmax_t is either 0 or +/- infinity. |
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| 118 | * |
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| 119 | * WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! |
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| 120 | * |
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| 121 | * This only works if __fpmax_t is the actual maximal floating point type used |
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| 122 | * in intermediate calculations. Otherwise, excess precision in the |
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| 123 | * intermediate values can cause the test to fail. |
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| 124 | * |
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| 125 | * WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! |
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| 126 | */ |
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| 127 | |
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| 128 | #define __FPMAX_ZERO_OR_INF_CHECK(x) ((x) == ((x)/4) ) |
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| 129 | |
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| 130 | #endif /* __UCLIBC_HAS_FLOATS__ */ |
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| 131 | |
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| 132 | #endif /* _UCLIBC_FPMAX_H */ |
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