/* * Copyright (C) 2003-2006 Manuel Novoa III * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ /* 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 */ #if defined _LIBC && defined IS_IN_libc extern __fpmax_t __strtofpmax(const char *str, char **endptr, int exp_adjust) attribute_hidden; #ifdef __UCLIBC_HAS_XLOCALE__ extern __fpmax_t __strtofpmax_l(const char *str, char **endptr, int exp_adjust, __locale_t locale_arg) attribute_hidden; #endif #ifdef __UCLIBC_HAS_WCHAR__ extern __fpmax_t __wcstofpmax(const wchar_t *wcs, wchar_t **endptr, int exp_adjust) attribute_hidden; #ifdef __UCLIBC_HAS_XLOCALE__ extern __fpmax_t __wcstofpmax_l(const wchar_t *wcs, wchar_t **endptr, int exp_adjust, __locale_t locale_arg) attribute_hidden; #endif #endif /* __UCLIBC_HAS_WCHAR__ */ #endif /* _LIBC */ /* 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 */