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MyMath.c
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C/C++ Source or Header
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2003-09-15
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9KB
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353 lines
#include <windows.h>
#include "Mathcrt.h"
#include "MyMath.h"
#include "Math.h"
// Converts String to Int (Dec, Hex) or Float value
void StringToItem(char *&s, ExpressionItem *item, int options)
{
item->type = IT_CONST | ITC_INT;
__int64 &v=*((__int64*)&(item->param1));
v = 0;
// Check for right input
if (!s) return;
// String-value
if ((((options & (STI_FLOAT | STI_INT)) == 0) || *s == '\'' || *s == '\"' || *s == '`' ||
((*s != '+') && (*s != '-') && ((*s < '0') || (*s > '9'))))
&& (options & STI_STRING))
{
// end of string char
char eol = 0;
if (*s == '\'' || *s == '\"' || *s == '`') eol = *s;
else s--;
item->type = IT_CONST | ITC_STRING;
// allocate memory buffer for string
char *sp;
sp = *((char**)&(item->param1)) = AllocString();
while (*(++s) && (*s != eol))
{
*(sp++) = *s;
}
if (*s == eol) s++;
*sp = 0;
} else
{
// strip leading spaces and tabs
while ((*s == ' ') || (*s == '\t')) s++;
// Hex-value
if ((options & STI_INT) && *s == '0' && (s[1] == 'x' || s[1] == 'X'))
{
s++;
while (*(s+1) == '0') *s++;
for (;;)
{
int c=*(++s);
if (c >= '0' && c <= '9') c-='0';
else if (c >= 'a' && c <= 'f') c-='a'-10;
else if (c >= 'A' && c <= 'F') c-='A'-10;
else break;
v<<=4;
v+=c;
}
}
// Dec-value, possible floating-point
else
{
int sign=0, numsignif = 0;
if (*s == '-') sign++; else s--;
while (*(s+1) == '0') *s++;
for (;;)
{
int c=*(++s) - '0'; numsignif++;
if ((options & STI_FLOAT) &&
((c == ('e'-'0')) || (c==('E'-'0')) || (c==('.'-'0'))
|| (numsignif > 18)))
{
// Switch to floating point conversion rountine
item->type = IT_CONST | ITC_FLOAT;
double& d = *((double*)&(item->param1));
d = (double) v;
while ((c >= 0) && (c <= 9))
{
d = d*10.0 + (double) c;
c=*(++s) - '0';
}
// sub-decimal part
if (c == ('.'-'0'))
{
double pwr = 1.0, dec = 0.0;
for (;;)
{
c=*(++s) - '0';
if ((c < 0) || (c > 9)) break;
dec = dec*10.0 + (double) c;
pwr *= 10.0;
}
d += dec/pwr;
}
// exponental part
if ((c == ('E'-'0')) || (c == ('e'-'0')))
{
int expc = 0, esign = 0;
s++;
// detect exponential sign
if ((*s == '+') || (*s == '-'))
esign = (*s == '-');
else s--;
// detect exp value
for (;;)
{
c=*(++s) - '0';
if ((c < 0) || (c > 9)) break;
expc = expc*10 + c;
}
if (expc >= DBL_MAX_EXP)
{
d = HUGE_VAL;
expc = 0;
}
double pwr = 1;
while (expc > 99) { pwr *= 1.0e100; expc -= 100; }
while (expc > 9) { pwr *= 1.0e10; expc -= 10; }
while (expc) { pwr *= 10.0; expc--; }
if (esign) d /= pwr;
else d *= pwr;
}
if (sign) d = -d;
return;
}
if (c < 0 || c > 9) break;
v*=10;
v+=c;
}
if (sign) v = -v;
if ((options & STI_FLOAT) && ((options & STI_INT) == 0))
{
double& d = *((double*)&(item->param1));
d = (double) v;
item->type = IT_CONST | ITC_FLOAT;
}
}
}
}
void ItemToString(char *sbuf, ExpressionItem *item)
{
if ((item == NULL) || ((item->type & ITEMTYPE) != IT_CONST))
{
*sbuf = 0;
return;
}
switch (item->type & ITEMSUBTYPE)
{
case ITC_STRING:
{
char *ptr = *((char**)&(item->param1));
while (*(sbuf++) = *(ptr++));
}
break;
case ITC_ARRAY:
{
ArrayDesc *ad = (ArrayDesc *) item->param1;
for (int index = 0; index < ad->count; index++)
if ((ad->array[index]) &&
((ad->array[index]->type & (ITEMTYPE|ITEMSUBTYPE)) == (IT_CONST | ITC_INT)))
if ((*(sbuf++) = (char) *((__int64*)&(ad->array[index]->param1))) == 0)
break;
}
break;
case ITC_FLOAT:
FloatFormat(sbuf, *((double*)&(item->param1)), 6);
break;
case ITC_INT:
itoa64(*((__int64*)&(item->param1)), sbuf);
break;
}
}
void itoa64(__int64 i, char *buffer)
{
char buf[128], *b = buf;
if (i < 0)
{
*(buffer++) = '-';
i = -i;
}
if (i == 0) *(buffer++) = '0';
else
{
while (i > 0)
{
*(b++) = '0' + ((char) (i%10));
i /= 10;
}
while (b > buf) *(buffer++) = *(--b);
}
*buffer = 0;
}
#define _FLOAT_ROUND_ADJUST (double)5e-15
extern "C"
int _floatp10(double *fnum, int *fsign, int prec);
extern "C"
int _ftol(double num);
#define POS_INFINITY "#INF"
#define NEG_INFINITY "-#INF"
void FloatFormatF(char *s, double value, int prec)
{
int fpower, fsign, fdigit, fprec = 0, fzfill = 0;
fpower = _floatp10(&value, &fsign, prec);
if(fsign < 0) *s++ = '-';
if(fpower < 0)
{
*s++ = '0';
fpower++;
fzfill++;
} else {
while(fpower >= 0)
{
if(fprec < 16)
{
fdigit = (int)value;
*s++ = (char)((char)fdigit + (char)48);
value -= (double)fdigit;
value *= (double)10;
value += _FLOAT_ROUND_ADJUST;
fprec++;
} else {
*s++ = '0';
}
fpower--;
}
fpower = 0;
}
if(prec)
{
*s++ = '.';
while(prec)
{
if(fzfill && fpower < 0)
{
*s++ = '0';
fpower++;
} else {
if(fprec < 16)
{
fdigit = (int)value;
*s++ = (unsigned char)((unsigned char)fdigit +
(unsigned char)48);
value -= (double)fdigit;
value *= (double)10;
value += _FLOAT_ROUND_ADJUST;
fprec++;
} else {
*s++ = '0';
}
}
prec--;
}
}
*s = '\0';
}
void FloatFormatE(char *s, double fnum, int options)
{
int fpower, fsign, fdigit, fprec = 0, prec, fzfill = 0;
double sfnum;
prec = options & 0xF;
sfnum = fnum;
fpower = _floatp10(&sfnum, &fsign, -999);
fpower = _floatp10(&fnum, &fsign, prec - fpower);
if(fsign < 0) *s++ = '-';
fdigit = (int)fnum;
*s++ = (char)((char)fdigit + (char)48);
fnum -= (double)fdigit;
fnum *= (double)10;
fnum += _FLOAT_ROUND_ADJUST;
if(prec)
{
*s++ = '.';
while(prec)
{
if(fprec < 16)
{
fdigit = (int)fnum;
*s++ = (unsigned char)((unsigned char)fdigit +
(unsigned char)48);
fnum -= (double)fdigit;
fnum *= (double)10;
fnum += _FLOAT_ROUND_ADJUST;
fprec++;
} else *s++ = '0';
prec--;
}
}
*s++ = ((options & FF_LEXP)?('E'):('e'));
if(fpower >= 0)
{
*s++ = '+';
} else {
*s++ = '-';
fpower = -fpower;
}
if(fpower < 10) *s++ = '0';
itoa64(fpower, s);
}
void FloatFormat(char *s, double value, int options)
{
int prec = options & 0xF;
if(value == HUGE_VAL)
{
lstrcpy(s, POS_INFINITY);
return;
} else if(value == -HUGE_VAL) {
lstrcpy(s, NEG_INFINITY);
return;
}
if (options & FF_NOEXP) FloatFormatF(s, value, prec);
else
if (options & FF_EXP) FloatFormatE(s, value, options);
else
{
double sfnum = value;
int fsign, fpower;
fpower = _floatp10(&sfnum, &fsign, -999);
sfnum = value;
fpower = _floatp10(&sfnum, &fsign, prec - fpower);
if((value != 0.0) && ((fpower < -4) || (fpower >= prec)))
FloatFormatE(s, value, options);
else
{
prec -= (fpower + 1);
if(prec <= 0) prec = 1;
FloatFormatF(s, value, prec);
}
}
}
int lstrcmpn(char *s1, const char *s2, int chars)
{
while ((chars > 0) && (*s1) && (*s2) && (*(s1) == *(s2))) chars--, s1++, s2++;
if ((chars == 0) || (*s1 == *s2)) return 0;
return (*s1 - *s2);
}