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73 lines
1.7 KiB
73 lines
1.7 KiB
/***
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*cfin.c - Encode interface for C
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*
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* Copyright (c) 19xx-1993, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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*
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*Revision History:
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* 07-20-91 GDP Ported to C from assembly
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* 04-30-92 GDP use __strgtold12 and _ld12tod
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* 06-22-92 GDP use new __strgtold12 interface
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* 04-06-93 SKS Replace _CALLTYPE* with __cdecl
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* 09-06-94 CFW Replace MTHREAD with _MT.
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*
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*******************************************************************************/
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#include <string.h>
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#include <cv.h>
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#ifndef _MT
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static struct _flt ret;
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static FLT flt = &ret;
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#endif
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/* The only three conditions that this routine detects */
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#define CFIN_NODIGITS 512
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#define CFIN_OVERFLOW 128
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#define CFIN_UNDERFLOW 256
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/* This version ignores the last two arguments (radix and scale)
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* Input string should be null terminated
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* len is also ignored
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*/
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#ifdef _MT
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FLT __cdecl _fltin2(FLT flt, const char *str, int len_ignore, int scale_ignore, int radix_ignore)
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#else
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FLT __cdecl _fltin(const char *str, int len_ignore, int scale_ignore, int radix_ignore)
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#endif
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{
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_LDBL12 ld12;
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DOUBLE x;
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const char *EndPtr;
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unsigned flags;
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int retflags = 0;
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flags = __strgtold12(&ld12, &EndPtr, str, 0, 0, 0, 0);
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if (flags & SLD_NODIGITS) {
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retflags |= CFIN_NODIGITS;
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*(u_long *)&x = 0;
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*((u_long *)&x+1) = 0;
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}
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else {
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INTRNCVT_STATUS intrncvt;
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intrncvt = _ld12tod(&ld12, &x);
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if (flags & SLD_OVERFLOW ||
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intrncvt == INTRNCVT_OVERFLOW) {
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retflags |= CFIN_OVERFLOW;
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}
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if (flags & SLD_UNDERFLOW ||
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intrncvt == INTRNCVT_UNDERFLOW) {
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retflags |= CFIN_UNDERFLOW;
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}
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}
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flt->flags = retflags;
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flt->nbytes = EndPtr - str;
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flt->dval = *(double *)&x;
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return flt;
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}
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