mirror of
https://github.com/reactos/reactos.git
synced 2024-11-20 06:15:26 +00:00
103 lines
1.4 KiB
C
103 lines
1.4 KiB
C
/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
|
|
/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
|
|
|
|
#include <precomp.h>
|
|
|
|
/*
|
|
* @implemented
|
|
*/
|
|
double
|
|
strtod(const char *s, char **sret)
|
|
{
|
|
long double r; /* result */
|
|
int e; /* exponent */
|
|
long double d; /* scale */
|
|
int sign; /* +- 1.0 */
|
|
int esign;
|
|
int i;
|
|
int flags=0;
|
|
|
|
r = 0.0;
|
|
sign = 1;
|
|
e = 0;
|
|
esign = 1;
|
|
|
|
if (s == NULL)
|
|
return r;
|
|
|
|
|
|
while ((*s == ' ') || (*s == '\t'))
|
|
s++;
|
|
|
|
if (*s == '+')
|
|
s++;
|
|
else if (*s == '-')
|
|
{
|
|
sign = -1;
|
|
s++;
|
|
}
|
|
|
|
while ((*s >= '0') && (*s <= '9'))
|
|
{
|
|
flags |= 1;
|
|
r *= 10.0;
|
|
r += *s - '0';
|
|
s++;
|
|
}
|
|
|
|
if (*s == '.')
|
|
{
|
|
d = 0.1L;
|
|
s++;
|
|
while ((*s >= '0') && (*s <= '9'))
|
|
{
|
|
flags |= 2;
|
|
r += d * (*s - '0');
|
|
s++;
|
|
d *= 0.1L;
|
|
}
|
|
}
|
|
|
|
if (flags == 0)
|
|
{
|
|
if (sret)
|
|
*sret = (char *)s;
|
|
return 0;
|
|
}
|
|
|
|
if ((*s == 'e') || (*s == 'E'))
|
|
{
|
|
s++;
|
|
if (*s == '+')
|
|
s++;
|
|
else if (*s == '-')
|
|
{
|
|
s++;
|
|
esign = -1;
|
|
}
|
|
if ((*s < '0') || (*s > '9'))
|
|
{
|
|
if (sret)
|
|
*sret = (char *)s;
|
|
return r;
|
|
}
|
|
|
|
while ((*s >= '0') && (*s <= '9'))
|
|
{
|
|
e *= 10;
|
|
e += *s - '0';
|
|
s++;
|
|
}
|
|
}
|
|
|
|
if (esign < 0)
|
|
for (i = 1; i <= e; i++)
|
|
r *= 0.1L;
|
|
else
|
|
for (i = 1; i <= e; i++)
|
|
r *= 10.0;
|
|
|
|
if (sret)
|
|
*sret = (char *)s;
|
|
return r * sign;
|
|
}
|