diff options
Diffstat (limited to 'libc/sysdeps/linux/common/bits/uClibc_fpmax.h')
| -rw-r--r-- | libc/sysdeps/linux/common/bits/uClibc_fpmax.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/bits/uClibc_fpmax.h b/libc/sysdeps/linux/common/bits/uClibc_fpmax.h new file mode 100644 index 000000000..08d47129c --- /dev/null +++ b/libc/sysdeps/linux/common/bits/uClibc_fpmax.h @@ -0,0 +1,132 @@ +/* Copyright (C) 2003 Manuel Novoa III + * + * This 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. + * + * This 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 this library; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* Define a maximal floating point type, and the associated constants + * that are defined for the floating point types in float.h. + * + * This is to support archs that are missing long double, or even double. + */ + +#ifndef _UCLIBC_FPMAX_H +#define _UCLIBC_FPMAX_H + +#ifndef _ISOC99_SOURCE +#define _ISOC99_SOURCE 1 +#endif + +#include <features.h> +#include <float.h> + +#ifdef __UCLIBC_HAS_FLOATS__ + +#if defined(LDBL_MANT_DIG) + +typedef long double __fpmax_t; +#define FPMAX_TYPE 3 + +#define FPMAX_MANT_DIG LDBL_MANT_DIG +#define FPMAX_DIG LDBL_DIG +#define FPMAX_EPSILON LDBL_EPSILON +#define FPMAX_MIN_EXP LDBL_MIN_EXP +#define FPMAX_MIN LDBL_MIN +#define FPMAX_MIN_10_EXP LDBL_MIN_10_EXP +#define FPMAX_MAX_EXP LDBL_MAX_EXP +#define FPMAX_MAX LDBL_MAX +#define FPMAX_MAX_10_EXP LDBL_MAX_10_EXP + +#elif defined(DBL_MANT_DIG) + +typedef double __fpmax_t; +#define FPMAX_TYPE 2 + +#define FPMAX_MANT_DIG DBL_MANT_DIG +#define FPMAX_DIG DBL_DIG +#define FPMAX_EPSILON DBL_EPSILON +#define FPMAX_MIN_EXP DBL_MIN_EXP +#define FPMAX_MIN DBL_MIN +#define FPMAX_MIN_10_EXP DBL_MIN_10_EXP +#define FPMAX_MAX_EXP DBL_MAX_EXP +#define FPMAX_MAX DBL_MAX +#define FPMAX_MAX_10_EXP DBL_MAX_10_EXP + +#elif defined(FLT_MANT_DIG) + +typedef float __fpmax_t; +#define FPMAX_TYPE 1 + +#define FPMAX_MANT_DIG FLT_MANT_DIG +#define FPMAX_DIG FLT_DIG +#define FPMAX_EPSILON FLT_EPSILON +#define FPMAX_MIN_EXP FLT_MIN_EXP +#define FPMAX_MIN FLT_MIN +#define FPMAX_MIN_10_EXP FLT_MIN_10_EXP +#define FPMAX_MAX_EXP FLT_MAX_EXP +#define FPMAX_MAX FLT_MAX +#define FPMAX_MAX_10_EXP FLT_MAX_10_EXP + +#else +#error unable to determine appropriate type for __fpmax_t! +#endif + +#ifndef DECIMAL_DIG + +#ifdef L___strtofpmax +/* Emit warning only once. */ +#warning DECIMAL_DIG is not defined! If you are using gcc, it may not be defining __STDC_VERSION__ as it should. +#endif +#if !defined(FLT_RADIX) || (FLT_RADIX != 2) +#error unable to compensate for missing DECIMAL_DIG! +#endif + +/* ceil (1 + #mantissa * log10 (FLT_RADIX)) */ +#define DECIMAL_DIG (1 + (((FPMAX_MANT_DIG * 100) + 331) / 332)) + +#endif /* DECIMAL_DIG */ + +extern __fpmax_t __strtofpmax(const char *str, char **endptr, int exp_adjust); + +#ifdef __UCLIBC_HAS_XLOCALE__ +extern __fpmax_t __strtofpmax_l(const char *str, char **endptr, int exp_adjust, + __locale_t locale_arg); +#endif + +#ifdef __UCLIBC_HAS_WCHAR__ +extern __fpmax_t __wcstofpmax(const wchar_t *wcs, wchar_t **endptr, + int exp_adjust); + +#ifdef __UCLIBC_HAS_XLOCALE__ +extern __fpmax_t __wcstofpmax_l(const wchar_t *wcs, wchar_t **endptr, + int exp_adjust, __locale_t locale_arg); +#endif +#endif /* __UCLIBC_HAS_WCHAR__ */ + +/* The following checks in an __fpmax_t is either 0 or +/- infinity. + * + * WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! + * + * This only works if __fpmax_t is the actual maximal floating point type used + * in intermediate calculations. Otherwise, excess precision in the + * intermediate values can cause the test to fail. + * + * WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! WARNING!!! + */ + +#define __FPMAX_ZERO_OR_INF_CHECK(x) ((x) == ((x)/4) ) + +#endif /* __UCLIBC_HAS_FLOATS__ */ + +#endif /* _UCLIBC_FPMAX_H */ |