【C Prime Plus】学习笔记,Chapter 4, limits.h 和 float.h

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//---

/***
*limits.h - implementation dependent values
*
*       Copyright (c) 1985-1997, Microsoft Corporation.  All rights reserved.
*
*Purpose:
*       Contains defines for a number of implementation dependent values
*       which are commonly used in C programs.
*       [ANSI]
*
*       [Public]
*
****/

#if     _MSC_VER > 1000
#pragma once
#endif

#ifndef _INC_LIMITS
#define _INC_LIMITS

#if     !defined(_WIN32) && !defined(_MAC)
#error ERROR: Only Mac or Win32 targets supported!
#endif


#define CHAR_BIT      8         /* number of bits in a char */
#define SCHAR_MIN   (-128)      /* minimum signed char value */
#define SCHAR_MAX     127       /* maximum signed char value */
#define UCHAR_MAX     0xff      /* maximum unsigned char value */

#ifndef _CHAR_UNSIGNED
#define CHAR_MIN    SCHAR_MIN   /* mimimum char value */
#define CHAR_MAX    SCHAR_MAX   /* maximum char value */
#else
#define CHAR_MIN      0
#define CHAR_MAX    UCHAR_MAX
#endif  /* _CHAR_UNSIGNED */

#define MB_LEN_MAX    2             /* max. # bytes in multibyte char */
#define SHRT_MIN    (-32768)        /* minimum (signed) short value */
#define SHRT_MAX      32767         /* maximum (signed) short value */
#define USHRT_MAX     0xffff        /* maximum unsigned short value */
#define INT_MIN     (-2147483647 - 1) /* minimum (signed) int value */
#define INT_MAX       2147483647    /* maximum (signed) int value */
#define UINT_MAX      0xffffffff    /* maximum unsigned int value */
#define LONG_MIN    (-2147483647L - 1) /* minimum (signed) long value */
#define LONG_MAX      2147483647L   /* maximum (signed) long value */
#define ULONG_MAX     0xffffffffUL  /* maximum unsigned long value */

#if     _INTEGRAL_MAX_BITS >= 8
#define _I8_MIN     (-127i8 - 1)    /* minimum signed 8 bit value */
#define _I8_MAX       127i8         /* maximum signed 8 bit value */
#define _UI8_MAX      0xffui8       /* maximum unsigned 8 bit value */
#endif

#if     _INTEGRAL_MAX_BITS >= 16
#define _I16_MIN    (-32767i16 - 1) /* minimum signed 16 bit value */
#define _I16_MAX      32767i16      /* maximum signed 16 bit value */
#define _UI16_MAX     0xffffui16    /* maximum unsigned 16 bit value */
#endif

#if     _INTEGRAL_MAX_BITS >= 32
#define _I32_MIN    (-2147483647i32 - 1) /* minimum signed 32 bit value */
#define _I32_MAX      2147483647i32 /* maximum signed 32 bit value */
#define _UI32_MAX     0xffffffffui32 /* maximum unsigned 32 bit value */
#endif

#if     _INTEGRAL_MAX_BITS >= 64
/* minimum signed 64 bit value */
#define _I64_MIN    (-9223372036854775807i64 - 1)
/* maximum signed 64 bit value */
#define _I64_MAX      9223372036854775807i64
/* maximum unsigned 64 bit value */
#define _UI64_MAX     0xffffffffffffffffui64
#endif

#if     _INTEGRAL_MAX_BITS >= 128
/* minimum signed 128 bit value */
#define _I128_MIN   (-170141183460469231731687303715884105727i128 - 1)
/* maximum signed 128 bit value */
#define _I128_MAX     170141183460469231731687303715884105727i128
/* maximum unsigned 128 bit value */
#define _UI128_MAX    0xffffffffffffffffffffffffffffffffui128
#endif

#ifdef  _POSIX_

#define _POSIX_ARG_MAX      4096
#define _POSIX_CHILD_MAX    6
#define _POSIX_LINK_MAX     8
#define _POSIX_MAX_CANON    255
#define _POSIX_MAX_INPUT    255
#define _POSIX_NAME_MAX     14
#define _POSIX_NGROUPS_MAX  0
#define _POSIX_OPEN_MAX     16
#define _POSIX_PATH_MAX     255
#define _POSIX_PIPE_BUF     512
#define _POSIX_SSIZE_MAX    32767
#define _POSIX_STREAM_MAX   8
#define _POSIX_TZNAME_MAX   3

#define ARG_MAX             14500       /* 16k heap, minus overhead */
#define LINK_MAX            1024
#define MAX_CANON           _POSIX_MAX_CANON
#define MAX_INPUT           _POSIX_MAX_INPUT
#define NAME_MAX            255
#define NGROUPS_MAX         16
#define OPEN_MAX            32
#define PATH_MAX            512
#define PIPE_BUF            _POSIX_PIPE_BUF
#define SSIZE_MAX           _POSIX_SSIZE_MAX
#define STREAM_MAX          20
#define TZNAME_MAX          10

#endif  /* POSIX */

#endif  /* _INC_LIMITS */

//---

/***
*float.h - constants for floating point values
*
*       Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       This file contains defines for a number of implementation dependent
*       values which are commonly used by sophisticated numerical (floating
*       point) programs.
*       [ANSI]
*
*       [Public]
*
****/

#if     _MSC_VER > 1000
#pragma once
#endif

#ifndef _INC_FLOAT
#define _INC_FLOAT

#if     !defined(_WIN32) && !defined(_MAC)
#error ERROR: Only Mac or Win32 targets supported!
#endif


#ifdef  __cplusplus
extern "C" {
#endif



/* Define _CRTIMP */

#ifndef _CRTIMP
#ifdef  _DLL
#define _CRTIMP __declspec(dllimport)
#else   /* ndef _DLL */
#define _CRTIMP
#endif  /* _DLL */
#endif  /* _CRTIMP */


/* Define __cdecl for non-Microsoft compilers */

#if     ( !defined(_MSC_VER) && !defined(__cdecl) )
#define __cdecl
#endif

/* Define _CRTAPI1 (for compatibility with the NT SDK) */

#ifndef _CRTAPI1
#if	_MSC_VER >= 800 && _M_IX86 >= 300
#define _CRTAPI1 __cdecl
#else
#define _CRTAPI1
#endif
#endif

#define DBL_DIG         15                      /* # of decimal digits of precision */
#define DBL_EPSILON     2.2204460492503131e-016 /* smallest such that 1.0+DBL_EPSILON != 1.0 */
#define DBL_MANT_DIG    53                      /* # of bits in mantissa */
#define DBL_MAX         1.7976931348623158e+308 /* max value */
#define DBL_MAX_10_EXP  308                     /* max decimal exponent */
#define DBL_MAX_EXP     1024                    /* max binary exponent */
#define DBL_MIN         2.2250738585072014e-308 /* min positive value */
#define DBL_MIN_10_EXP  (-307)                  /* min decimal exponent */
#define DBL_MIN_EXP     (-1021)                 /* min binary exponent */
#define _DBL_RADIX      2                       /* exponent radix */
#define _DBL_ROUNDS     1                       /* addition rounding: near */

#define FLT_DIG         6                       /* # of decimal digits of precision */
#define FLT_EPSILON     1.192092896e-07F        /* smallest such that 1.0+FLT_EPSILON != 1.0 */
#define FLT_GUARD       0
#define FLT_MANT_DIG    24                      /* # of bits in mantissa */
#define FLT_MAX         3.402823466e+38F        /* max value */
#define FLT_MAX_10_EXP  38                      /* max decimal exponent */
#define FLT_MAX_EXP     128                     /* max binary exponent */
#define FLT_MIN         1.175494351e-38F        /* min positive value */
#define FLT_MIN_10_EXP  (-37)                   /* min decimal exponent */
#define FLT_MIN_EXP     (-125)                  /* min binary exponent */
#define FLT_NORMALIZE   0
#define FLT_RADIX       2                       /* exponent radix */
#define FLT_ROUNDS      1                       /* addition rounding: near */

#ifndef _M_M68K
#define LDBL_DIG        DBL_DIG                 /* # of decimal digits of precision */
#define LDBL_EPSILON    DBL_EPSILON             /* smallest such that 1.0+LDBL_EPSILON != 1.0 */
#define LDBL_MANT_DIG   DBL_MANT_DIG            /* # of bits in mantissa */
#define LDBL_MAX        DBL_MAX                 /* max value */
#define LDBL_MAX_10_EXP DBL_MAX_10_EXP          /* max decimal exponent */
#define LDBL_MAX_EXP    DBL_MAX_EXP             /* max binary exponent */
#define LDBL_MIN        DBL_MIN                 /* min positive value */
#define LDBL_MIN_10_EXP DBL_MIN_10_EXP          /* min decimal exponent */
#define LDBL_MIN_EXP    DBL_MIN_EXP             /* min binary exponent */
#define _LDBL_RADIX     DBL_RADIX               /* exponent radix */
#define _LDBL_ROUNDS    DBL_ROUNDS              /* addition rounding: near */
#else
#define LDBL_DIG        18                                      /* # of decimal digits of precision */
#define LDBL_EPSILON    1.08420217248550443412e-019L            /* smallest such that 1.0+LDBL_EPSILON != 1.0 */
#define LDBL_MANT_DIG   64                                      /* # of bits in mantissa */
#define LDBL_MAX        1.189731495357231765e+4932L             /* max value */
#define LDBL_MAX_10_EXP 4932                                    /* max decimal exponent */
#define LDBL_MAX_EXP    16384                                   /* max binary exponent */
#define LDBL_MIN        3.3621031431120935063e-4932L            /* min positive value */
#define LDBL_MIN_10_EXP (-4931)                                 /* min decimal exponent */
#define LDBL_MIN_EXP    (-16381)                                /* min binary exponent */
#define _LDBL_RADIX     2                                       /* exponent radix */
#define _LDBL_ROUNDS    1                                       /* addition rounding: near */
#endif

/* Function prototypes */

_CRTIMP unsigned int __cdecl _clearfp(void);
_CRTIMP unsigned int __cdecl _controlfp(unsigned int,unsigned int);
_CRTIMP unsigned int __cdecl _statusfp(void);
_CRTIMP void __cdecl _fpreset(void);

#ifndef _MAC
#define _clear87        _clearfp
#define _status87       _statusfp
#endif /* _MAC */

/*
 * Abstract User Control Word Mask and bit definitions
 */
#ifndef _MAC
#define _MCW_EM         0x0008001f              /* interrupt Exception Masks */
#else
#define _MCW_EM         0x0000001f              /* interrupt Exception Masks */
#endif
#define _EM_INEXACT     0x00000001              /*   inexact (precision) */
#define _EM_UNDERFLOW   0x00000002              /*   underflow */
#define _EM_OVERFLOW    0x00000004              /*   overflow */
#define _EM_ZERODIVIDE  0x00000008              /*   zero divide */
#define _EM_INVALID     0x00000010              /*   invalid */

#define _MCW_RC         0x00000300              /* Rounding Control */
#define _RC_NEAR        0x00000000              /*   near */
#define _RC_DOWN        0x00000100              /*   down */
#define _RC_UP          0x00000200              /*   up */
#define _RC_CHOP        0x00000300              /*   chop */

/*
 * Abstract User Status Word bit definitions
 */

#define _SW_INEXACT     0x00000001              /* inexact (precision) */
#define _SW_UNDERFLOW   0x00000002              /* underflow */
#define _SW_OVERFLOW    0x00000004              /* overflow */
#define _SW_ZERODIVIDE  0x00000008              /* zero divide */
#define _SW_INVALID     0x00000010              /* invalid */


/*
 * i386 specific definitions
 */
#define _MCW_PC         0x00030000              /* Precision Control */
#ifdef  _M_MPPC
/*
 * PowerMac specific definitions(no precision control)
 */
#define _PC_64          0x00000000              /*    64 bits */
#define _PC_53          0x00000000              /*    53 bits */
#define _PC_24          0x00000000              /*    24 bits */
#else
#define _PC_64          0x00000000              /*    64 bits */
#define _PC_53          0x00010000              /*    53 bits */
#define _PC_24          0x00020000              /*    24 bits */
#endif

#define _MCW_IC         0x00040000              /* Infinity Control */
#define _IC_AFFINE      0x00040000              /*   affine */
#define _IC_PROJECTIVE  0x00000000              /*   projective */

#define _EM_DENORMAL    0x00080000              /* denormal exception mask (_control87 only) */

#define _SW_DENORMAL    0x00080000              /* denormal status bit */


_CRTIMP unsigned int __cdecl _control87(unsigned int,unsigned int);


/*
 * RISC specific definitions
 */

#define _MCW_DN         0x03000000              /* Denormal Control */
#define _DN_SAVE        0x00000000              /*   save denormal results and operands */
#define _DN_FLUSH       0x01000000              /*   flush denormal results and operands to zero */
#define _DN_FLUSH_OPERANDS_SAVE_RESULTS 0x02000000  /*   flush operands to zero and save results */
#define _DN_SAVE_OPERANDS_FLUSH_RESULTS 0x03000000  /*   save operands and flush results to zero */


/* initial Control Word value */

#if     defined(_M_IX86)

#define _CW_DEFAULT ( _RC_NEAR + _PC_53 + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT + _EM_DENORMAL)

#elif   defined(_MAC)

#define _CW_DEFAULT ( _RC_NEAR + _PC_64 + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT )

#elif   defined(_M_MRX000) || defined (_M_ALPHA) || defined(_M_PPC)

#define _CW_DEFAULT ( _RC_NEAR + _DN_FLUSH + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT )

#endif

/* Global variable holding floating point error code */

#if     defined(_MT) || defined(_DLL)
_CRTIMP extern int * __cdecl __fpecode(void);
#define _fpecode        (*__fpecode())
#else   /* ndef _MT && ndef _DLL */
extern int _fpecode;
#endif  /* _MT || _DLL */

/* invalid subconditions (_SW_INVALID also set) */

#define _SW_UNEMULATED          0x0040  /* unemulated instruction */
#define _SW_SQRTNEG             0x0080  /* square root of a neg number */
#define _SW_STACKOVERFLOW       0x0200  /* FP stack overflow */
#define _SW_STACKUNDERFLOW      0x0400  /* FP stack underflow */

/*  Floating point error signals and return codes */

#define _FPE_INVALID            0x81
#define _FPE_DENORMAL           0x82
#define _FPE_ZERODIVIDE         0x83
#define _FPE_OVERFLOW           0x84
#define _FPE_UNDERFLOW          0x85
#define _FPE_INEXACT            0x86

#define _FPE_UNEMULATED         0x87
#define _FPE_SQRTNEG            0x88
#define _FPE_STACKOVERFLOW      0x8a
#define _FPE_STACKUNDERFLOW     0x8b

#define _FPE_EXPLICITGEN        0x8c    /* raise( SIGFPE ); */


/* IEEE recommended functions */

_CRTIMP double __cdecl _copysign (double, double);
_CRTIMP double __cdecl _chgsign (double);
_CRTIMP double __cdecl _scalb(double, long);
_CRTIMP double __cdecl _logb(double);
_CRTIMP double __cdecl _nextafter(double, double);
_CRTIMP int    __cdecl _finite(double);
_CRTIMP int    __cdecl _isnan(double);
_CRTIMP int    __cdecl _fpclass(double);

#define _FPCLASS_SNAN   0x0001  /* signaling NaN */
#define _FPCLASS_QNAN   0x0002  /* quiet NaN */
#define _FPCLASS_NINF   0x0004  /* negative infinity */
#define _FPCLASS_NN     0x0008  /* negative normal */
#define _FPCLASS_ND     0x0010  /* negative denormal */
#define _FPCLASS_NZ     0x0020  /* -0 */
#define _FPCLASS_PZ     0x0040  /* +0 */
#define _FPCLASS_PD     0x0080  /* positive denormal */
#define _FPCLASS_PN     0x0100  /* positive normal */
#define _FPCLASS_PINF   0x0200  /* positive infinity */


#if     !__STDC__

/* Non-ANSI names for compatibility */

#ifndef _MAC
#define clear87         _clear87
#define status87        _status87
#define control87       _control87
#endif /* _MAC */

_CRTIMP void __cdecl fpreset(void);

#define DBL_RADIX               _DBL_RADIX
#define DBL_ROUNDS              _DBL_ROUNDS

#define LDBL_RADIX              _LDBL_RADIX
#define LDBL_ROUNDS             _LDBL_ROUNDS

#define MCW_EM                  _MCW_EM
#define EM_INVALID              _EM_INVALID
#define EM_DENORMAL             _EM_DENORMAL
#define EM_ZERODIVIDE           _EM_ZERODIVIDE
#define EM_OVERFLOW             _EM_OVERFLOW
#define EM_UNDERFLOW            _EM_UNDERFLOW
#define EM_INEXACT              _EM_INEXACT

#define MCW_IC                  _MCW_IC
#define IC_AFFINE               _IC_AFFINE
#define IC_PROJECTIVE           _IC_PROJECTIVE

#define MCW_RC                  _MCW_RC
#define RC_CHOP                 _RC_CHOP
#define RC_UP                   _RC_UP
#define RC_DOWN                 _RC_DOWN
#define RC_NEAR                 _RC_NEAR

#define MCW_PC                  _MCW_PC
#define PC_24                   _PC_24
#define PC_53                   _PC_53
#define PC_64                   _PC_64

#define CW_DEFAULT              _CW_DEFAULT

#define SW_INVALID              _SW_INVALID
#define SW_DENORMAL             _SW_DENORMAL
#define SW_ZERODIVIDE           _SW_ZERODIVIDE
#define SW_OVERFLOW             _SW_OVERFLOW
#define SW_UNDERFLOW            _SW_UNDERFLOW
#define SW_INEXACT              _SW_INEXACT

#define SW_UNEMULATED           _SW_UNEMULATED
#define SW_SQRTNEG              _SW_SQRTNEG
#define SW_STACKOVERFLOW        _SW_STACKOVERFLOW
#define SW_STACKUNDERFLOW       _SW_STACKUNDERFLOW

#define FPE_INVALID             _FPE_INVALID
#define FPE_DENORMAL            _FPE_DENORMAL
#define FPE_ZERODIVIDE          _FPE_ZERODIVIDE
#define FPE_OVERFLOW            _FPE_OVERFLOW
#define FPE_UNDERFLOW           _FPE_UNDERFLOW
#define FPE_INEXACT             _FPE_INEXACT

#define FPE_UNEMULATED          _FPE_UNEMULATED
#define FPE_SQRTNEG             _FPE_SQRTNEG
#define FPE_STACKOVERFLOW       _FPE_STACKOVERFLOW
#define FPE_STACKUNDERFLOW      _FPE_STACKUNDERFLOW

#define FPE_EXPLICITGEN         _FPE_EXPLICITGEN

#endif  /* __STDC__ */

#ifdef  __cplusplus
}
#endif

#endif  /* _INC_FLOAT */

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