90 lines
1.7 KiB
C
90 lines
1.7 KiB
C
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// ldouble.h
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// Copyright (C) 1993, Microsoft Corporation
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// Purpose:
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// define stuff needed for long double in win32
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// Revision History:
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// [] 06-Apr-1993 Dans Created
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#if !defined(_ldouble_h)
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#define _ldouble_h
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#include <cvinfo.h> // for FLOAT10
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#include <stdio.h>
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#include <string.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(TRUE)
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#define TRUE 1
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#endif
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#if !defined(FALSE)
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#define FALSE 0
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#endif
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#pragma pack(push, 2)
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// little endian, 10byte float, same as FLOAT10, but easier to parse!
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typedef struct F10_REP {
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unsigned long ulManLo;
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unsigned long ulManHi;
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unsigned short usExp : 15;
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unsigned short bSign : 1;
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} F10_REP;
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#pragma pack(pop)
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// special bits
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#define bNan 0x40000000
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#define bInd 0xc0000000
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#define bExpSp 0x7fff
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#define bSign 0x8000
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#define bMsbShort 0x8000
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#define bMsbLong 0x80000000
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// get a string rep of long doubles
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// always scientific notation:
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// [+-]x.yyyyyyyyyyyyyyyyyye[+-]zzzz, LDBL_DIG digits of precision
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char * SzFromLd ( char * pchBuf, size_t cb, FLOAT10 f10 );
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// get a float10 rep of a string
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// (basically _strtold from 16-bit runtimes)
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FLOAT10 LdFromSz ( char * szFloat, char ** ppchEnd );
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// compare a 10-byte float to zero
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#define PF10(x) ((F10_REP*)&x)
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__inline int
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FCmpLdZero (
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FLOAT10 f10
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)
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{
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return !(PF10(f10)->ulManLo || PF10(f10)->ulManHi || PF10(f10)->usExp);
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}
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// give the real values for 10-byte reals in place of the CRT in float.h
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// values were retrieved from 16-bit version of float.h.
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#undef LDBL_MAX_10_EXP
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#define LDBL_MAX_10_EXP 4932
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#undef LDBL_MIN_10_EXP
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#define LDBL_MIN_10_EXP -4931
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#undef LDBL_DIG
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#define LDBL_DIG 18
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#ifdef __cplusplus
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} // extern "C" {
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#endif
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#endif
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