65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
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/***
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*fltinf.c - Encode interface for FORTRAN
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*
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* Copyright (c) 1992-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* FORTRAN interface for decimal to binary (input) conversion
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*
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*Revision History:
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* 06-22-92 GDP Modified version of cfin.c for FORTRAN support
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* 04-06-93 SKS Replace _CALLTYPE* with __cdecl
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* 10-06-99 PML Copy a DOUBLE, not double, to avoid exceptions
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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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static struct _flt ret;
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static FLT flt = &ret;
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/* Error codes set by this routine */
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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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#define CFIN_INVALID 64
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FLT __cdecl _fltinf(const char *str, int len, int scale, int decpt)
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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, scale, decpt, 1);
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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->nbytes = (int)(EndPtr - str);
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if (len != flt->nbytes)
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retflags |= CFIN_INVALID;
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*(DOUBLE *)&flt->dval = *(DOUBLE *)&x;
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flt->flags = retflags;
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return flt;
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}
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