mirror of
https://github.com/reactos/reactos.git
synced 2024-07-07 13:15:07 +00:00
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <malloc.h>
|
|
// #include <msvcrt/locale.h>
|
|
|
|
// replace fjgpp fcvtbuf from project http://www.jbox.dk/sanos/source/lib/fcvt.c.html
|
|
// with small modification's to match ReactOS arch
|
|
|
|
// Floating point to string conversion routines
|
|
//
|
|
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions
|
|
// are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// 2. Redistributions in binary form must reproduce the above copyright
|
|
// notice, this list of conditions and the following disclaimer in the
|
|
// documentation and/or other materials provided with the distribution.
|
|
// 3. Neither the name of the project nor the names of its contributors
|
|
// may be used to endorse or promote products derived from this software
|
|
// without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
|
|
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
// SUCH DAMAGE.
|
|
//
|
|
|
|
|
|
//#include <math.h>
|
|
#define CVTBUFSIZE 2 * DBL_MAX_10_EXP + 10
|
|
static char *cvt(double arg, int ndigits, int *decpt, int *sign, char *buf, int eflag)
|
|
{
|
|
int r2;
|
|
double fi, fj;
|
|
char *p, *p1;
|
|
|
|
if (ndigits >= CVTBUFSIZE - 1) ndigits = CVTBUFSIZE - 2;
|
|
r2 = 0;
|
|
*sign = 0;
|
|
p = &buf[0];
|
|
if (arg < 0)
|
|
{
|
|
*sign = 1;
|
|
arg = -arg;
|
|
}
|
|
arg = modf(arg, &fi);
|
|
p1 = &buf[CVTBUFSIZE];
|
|
|
|
if (fi != 0)
|
|
{
|
|
p1 = &buf[CVTBUFSIZE];
|
|
while (fi != 0)
|
|
{
|
|
fj = modf(fi / 10, &fi);
|
|
*--p1 = (int)((fj + .03) * 10) + '0';
|
|
r2++;
|
|
}
|
|
while (p1 < &buf[CVTBUFSIZE]) *p++ = *p1++;
|
|
}
|
|
else if (arg > 0)
|
|
{
|
|
while ((fj = arg * 10) < 1)
|
|
{
|
|
arg = fj;
|
|
r2--;
|
|
}
|
|
}
|
|
p1 = &buf[ndigits];
|
|
if (eflag == 0) p1 += r2;
|
|
*decpt = r2;
|
|
if (p1 < &buf[0])
|
|
{
|
|
buf[0] = '\0';
|
|
return buf;
|
|
}
|
|
while (p <= p1 && p < &buf[CVTBUFSIZE])
|
|
{
|
|
arg *= 10;
|
|
arg = modf(arg, &fj);
|
|
*p++ = (int) fj + '0';
|
|
}
|
|
if (p1 >= &buf[CVTBUFSIZE])
|
|
{
|
|
buf[CVTBUFSIZE - 1] = '\0';
|
|
return buf;
|
|
}
|
|
p = p1;
|
|
*p1 += 5;
|
|
while (*p1 > '9')
|
|
{
|
|
*p1 = '0';
|
|
if (p1 > buf)
|
|
++*--p1;
|
|
else
|
|
{
|
|
*p1 = '1';
|
|
(*decpt)++;
|
|
if (eflag == 0)
|
|
{
|
|
if (p > buf) *p = '0';
|
|
p++;
|
|
}
|
|
}
|
|
}
|
|
*p = '\0';
|
|
return buf;
|
|
}
|
|
|
|
char *fcvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf)
|
|
{
|
|
return cvt(arg, ndigits, decpt, sign, buf, 0);
|
|
}
|