277 lines
7.3 KiB
C
277 lines
7.3 KiB
C
#include "global.h"
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#define BUFF_LEN 0x20
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s16 _Ldunscale(s16*, _Pft*);
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void _Genld(_Pft*, u8, u8*, s16, s16);
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const f64 D_800122E0[] = { 10e0L, 10e1L, 10e3L, 10e7L, 10e15L, 10e31L, 10e63L, 10e127L, 10e255L };
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/* float properties */
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#define _D0 0
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#define _DBIAS 0x3FF
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#define _DLONG 1
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#define _DOFF 4
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#define _FBIAS 0x7E
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#define _FOFF 7
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#define _FRND 1
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#define _LBIAS 0x3FFE
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#define _LOFF 15
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/* integer properties */
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#define _C2 1
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#define _CSIGN 1
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#define _ILONG 0
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#define _MBMAX 8
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#define NAN 2
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#define INF 1
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#define FINITE -1
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#define _DFRAC ((1 << _DOFF) - 1)
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#define _DMASK (0x7FFF & ~_DFRAC)
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#define _DMAX ((1 << (15 - _DOFF)) - 1)
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#define _DNAN (0x8000 | _DMAX << _DOFF | 1 << (_DOFF - 1))
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#define _DSIGN 0x8000
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#if _D0 == 3
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#define _D1 2 /* little-endian order */
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#define _D2 1
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#define _D3 0
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#else
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#define _D1 1 /* big-endian order */
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#define _D2 2
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#define _D3 3
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#endif
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void _Ldtob(_Pft* args, u8 type) {
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u8 buff[BUFF_LEN];
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u8* ptr = buff;
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u32 sp70;
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f64 val = args->v.ld;
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/* maybe struct? */
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s16 err;
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s16 nsig;
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s16 exp;
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s32 i;
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s32 n;
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f64 factor;
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s32 gen;
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s32 j;
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s32 lo;
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ldiv_t qr;
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u8 drop;
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s32 n2;
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if (args->prec < 0) {
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args->prec = 6;
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} else if (args->prec == 0 && (type == 'g' || type == 'G')) {
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args->prec = 1;
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}
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err = _Ldunscale(&exp, (_Pft*)args);
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if (err > 0) {
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memcpy(args->s, err == 2 ? "NaN" : "Inf", args->n1 = 3);
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return;
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}
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if (err == 0) {
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nsig = 0;
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exp = 0;
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} else {
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if (val < 0) {
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val = -val;
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}
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exp = exp * 30103 / 0x000186A0 - 4;
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if (exp < 0) {
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n = (3 - exp) & ~3;
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exp = -n;
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for (i = 0; n > 0; n >>= 1, i++) {
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if ((n & 1) != 0) {
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val *= D_800122E0[i];
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}
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}
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} else if (exp > 0) {
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factor = 1;
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exp &= ~3;
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for (n = exp, i = 0; n > 0; n >>= 1, i++) {
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if ((n & 1) != 0) {
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factor *= D_800122E0[i];
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}
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}
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val /= factor;
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}
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gen = ((type == 'f') ? exp + 10 : 6) + args->prec;
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if (gen > 0x13) {
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gen = 0x13;
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}
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*ptr++ = '0';
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while (gen > 0 && 0 < val) {
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lo = val;
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if ((gen -= 8) > 0) {
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val = (val - lo) * 1.0e8;
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}
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ptr = ptr + 8;
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for (j = 8; lo > 0 && --j >= 0;) {
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qr = ldiv(lo, 10);
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*--ptr = qr.rem + '0';
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lo = qr.quot;
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}
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while (--j >= 0) {
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ptr--;
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*ptr = '0';
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}
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ptr += 8;
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}
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gen = ptr - &buff[1];
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for (ptr = &buff[1], exp += 7; *ptr == '0'; ptr++) {
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--gen, --exp;
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}
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nsig = ((type == 'f') ? exp + 1 : ((type == 'e' || type == 'E') ? 1 : 0)) + args->prec;
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if (gen < nsig) {
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nsig = gen;
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}
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if (nsig > 0) {
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if (nsig < gen && ptr[nsig] > '4') {
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drop = '9';
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} else {
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drop = '0';
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}
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for (n2 = nsig; ptr[--n2] == drop;) {
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nsig--;
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}
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if (drop == '9') {
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ptr[n2]++;
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}
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if (n2 < 0) {
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--ptr, ++nsig, ++exp;
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}
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}
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}
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_Genld((_Pft*)args, type, ptr, nsig, exp);
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}
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s16 _Ldunscale(s16* pex, _Pft* px) {
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u16* ps = (u16*)px;
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s16 xchar = (ps[_D0] & _DMASK) >> _DOFF;
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if (xchar == _DMAX) { /* NaN or INF */
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*pex = 0;
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return (s16)(ps[_D0] & _DFRAC || ps[_D1] || ps[_D2] || ps[_D3] ? NAN : INF);
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} else if (0 < xchar) {
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ps[_D0] = (ps[_D0] & ~_DMASK) | (_DBIAS << _DOFF);
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*pex = xchar - (_DBIAS - 1);
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return FINITE;
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}
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if (0 > xchar) {
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return NAN;
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} else {
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*pex = 0;
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return 0;
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}
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}
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void _Genld(_Pft* px, u8 code, u8* p, s16 nsig, s16 xexp) {
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u8 point = '.';
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if (nsig <= 0) {
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nsig = 1,
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p = (u8*)"0";
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}
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if (code == 'f' || ((code == 'g' || code == 'G') && (-4 <= xexp) && (xexp < px->prec))) { /* 'f' format */
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++xexp; /* change to leading digit count */
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if (code != 'f') { /* fixup for 'g' */
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if (!(px->flags & FLAGS_HASH) && nsig < px->prec) {
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px->prec = nsig;
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}
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if ((px->prec -= xexp) < 0) {
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px->prec = 0;
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}
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}
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if (xexp <= 0) { /* digits only to right of point */
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px->s[px->n1++] = '0';
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if (0 < px->prec || px->flags & FLAGS_HASH) {
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px->s[px->n1++] = point;
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}
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if (px->prec < -xexp) {
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xexp = -px->prec;
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}
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px->nz1 = -xexp;
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px->prec += xexp;
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if (px->prec < nsig) {
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nsig = px->prec;
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}
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memcpy(&px->s[px->n1], p, px->n2 = nsig);
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px->nz2 = px->prec - nsig;
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} else if (nsig < xexp) { /* zeros before point */
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memcpy(&px->s[px->n1], p, nsig);
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px->n1 += nsig;
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px->nz1 = xexp - nsig;
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if (0 < px->prec || px->flags & FLAGS_HASH) {
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px->s[px->n1] = point, ++px->n2;
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}
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px->nz2 = px->prec;
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} else { /* enough digits before point */
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memcpy(&px->s[px->n1], p, xexp);
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px->n1 += xexp;
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nsig -= xexp;
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if (0 < px->prec || px->flags & FLAGS_HASH) {
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px->s[px->n1++] = point;
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}
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if (px->prec < nsig) {
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nsig = px->prec;
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}
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memcpy(&px->s[px->n1], p + xexp, nsig);
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px->n1 += nsig;
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px->nz1 = px->prec - nsig;
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}
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} else { /* 'e' format */
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if (code == 'g' || code == 'G') { /* fixup for 'g' */
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if (nsig < px->prec) {
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px->prec = nsig;
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}
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if (--px->prec < 0) {
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px->prec = 0;
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}
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code = code == 'g' ? 'e' : 'E';
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}
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px->s[px->n1++] = *p++;
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if (0 < px->prec || px->flags & FLAGS_HASH) {
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px->s[px->n1++] = point;
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}
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if (0 < px->prec) { /* put fraction digits */
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if (px->prec < --nsig) {
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nsig = px->prec;
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}
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memcpy(&px->s[px->n1], p, nsig);
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px->n1 += nsig;
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px->nz1 = px->prec - nsig;
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}
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p = (u8*)&px->s[px->n1]; /* put exponent */
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*p++ = code;
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if (0 <= xexp) {
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*p++ = '+';
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} else { /* negative exponent */
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*p++ = '-';
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xexp = -xexp;
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}
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if (100 <= xexp) { /* put oversize exponent */
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if (1000 <= xexp) {
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*p++ = xexp / 1000 + '0', xexp %= 1000;
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}
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*p++ = xexp / 100 + '0', xexp %= 100;
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}
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*p++ = xexp / 10 + '0', xexp %= 10;
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*p++ = xexp + '0';
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px->n2 = p - (u8*)&px->s[px->n1];
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}
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if ((px->flags & (FLAGS_ZERO | FLAGS_MINUS)) == FLAGS_ZERO) { /* pad with leading zeros */
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s32 n = px->n0 + px->n1 + px->nz1 + px->n2 + px->nz2;
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if (n < px->width) {
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px->nz0 = px->width - n;
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}
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}
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}
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