85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* xxstod.h -- _[W]Sto[d f ld] common functionality */
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#pragma warning(disable: 4210)
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/* macros */
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#define ACSIZE 3 /* size of extended-precision accumulators */
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#define D16TO7 FLIT(268435456.0) /* 16^7 */
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#define D10TO9 FLIT(1e9) /* 10^9 */
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#define NLONG ((FBITS + 27) / 28) /* 7 * NLONG == max hexadecimal digits */
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/*
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FTYPE _Stodx(const CTYPE *s, CTYPE **endptr, long pten, int *perr)
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*/
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{ /* convert string to FTYPE, with checking */
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FTYPE x;
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long lo[NLONG + 1];
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const CTYPE *s0 = s;
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int code = CNAME(Stopfx)(&s, endptr);
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const int neg = code & FL_NEG;
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extern _CRTIMP2_PURE FTYPE __CLRCALL_PURE_OR_CDECL FNAME(Dtento)(FTYPE *, long, int *);
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if (perr != 0)
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*perr = 0;
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if ((code &= ~FL_NEG) == FL_DEC)
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{ /* parse decimal format */
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const int nlo = CNAME(Stoflt)(s0, s, endptr, lo, NLONG);
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FTYPE xpx[ACSIZE], xpf[ACSIZE];
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int i;
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FNAME(Xp_setw)(xpf, ACSIZE, D10TO9);
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if (nlo == 0)
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FNAME(Xp_setw)(xpx, ACSIZE, 0.0);
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else
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for (i = 1, FNAME(Xp_setn)(xpx, ACSIZE, lo[1]); i < nlo; )
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{ /* x = x * D10TO9 + (FTYPE)lo[++i] */
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FTYPE xpa[ACSIZE];
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FTYPE xpt[ACSIZE * 2];
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FNAME(Xp_mulx)(xpx, ACSIZE, xpf, ACSIZE, xpt);
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FNAME(Xp_setn)(xpa, ACSIZE, lo[++i]);
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FNAME(Xp_addx)(xpx, ACSIZE, xpa, ACSIZE);
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}
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x = FNAME(Dtento)(xpx, pten + lo[0], perr);
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}
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else if (code == FL_HEX)
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{ /* parse hexadecimal format */
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const int nlo = CNAME(Stoxflt)(s0, s, endptr, lo, NLONG);
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FTYPE xpx[ACSIZE], xpf[ACSIZE];
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int i;
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FNAME(Xp_setw)(xpf, ACSIZE, D16TO7);
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if (nlo == 0)
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FNAME(Xp_setw)(xpx, ACSIZE, 0.0);
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else
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for (i = 1, FNAME(Xp_setn)(xpx, ACSIZE, lo[1]); i < nlo; )
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{ /* x = x * D10TO9 + (FTYPE)lo[++i] */
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FTYPE xpa[ACSIZE];
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FTYPE xpt[ACSIZE * 2];
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FNAME(Xp_mulx)(xpx, ACSIZE, xpf, ACSIZE, xpt);
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FNAME(Xp_setn)(xpa, ACSIZE, lo[++i]);
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FNAME(Xp_addx)(xpx, ACSIZE, xpa, ACSIZE);
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}
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x = FNAME(Dtento)(xpx, pten, perr);
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FNAME(Dscale)(&x, lo[0]);
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}
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else if (code == FL_INF)
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x = FCONST(Inf);
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else if (code == FL_NAN)
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x = FCONST(Nan);
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else
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x = FLIT(0.0); /* code == FL_ERR */
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if (neg)
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FNEGATE(x);
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return (x);
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}
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/*
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* Copyright (c) 1992-2012 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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V6.00:0009 */
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