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/*

 * 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 */