You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
815 B
51 lines
815 B
4 years ago
|
|
||
|
|
/* Just in case you haven't got an atof() around...
|
||
|
|
This one doesn't check for bad syntax or overflow,
|
||
|
|
and is slow and inaccurate.
|
||
|
|
But it's good enough for the occasional string literal... */
|
||
|
|
|
||
|
|
#include "pyconfig.h"
|
||
|
|
|
||
|
|
#include <ctype.h>
|
||
|
|
|
||
|
|
double atof(char *s)
|
||
|
|
{
|
||
|
|
double a = 0.0;
|
||
|
|
int e = 0;
|
||
|
|
int c;
|
||
|
|
while ((c = *s++) != '\0' && isdigit(c)) {
|
||
|
|
a = a*10.0 + (c - '0');
|
||
|
|
}
|
||
|
|
if (c == '.') {
|
||
|
|
while ((c = *s++) != '\0' && isdigit(c)) {
|
||
|
|
a = a*10.0 + (c - '0');
|
||
|
|
e = e-1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (c == 'e' || c == 'E') {
|
||
|
|
int sign = 1;
|
||
|
|
int i = 0;
|
||
|
|
c = *s++;
|
||
|
|
if (c == '+')
|
||
|
|
c = *s++;
|
||
|
|
else if (c == '-') {
|
||
|
|
c = *s++;
|
||
|
|
sign = -1;
|
||
|
|
}
|
||
|
|
while (isdigit(c)) {
|
||
|
|
i = i*10 + (c - '0');
|
||
|
|
c = *s++;
|
||
|
|
}
|
||
|
|
e += i*sign;
|
||
|
|
}
|
||
|
|
while (e > 0) {
|
||
|
|
a *= 10.0;
|
||
|
|
e--;
|
||
|
|
}
|
||
|
|
while (e < 0) {
|
||
|
|
a *= 0.1;
|
||
|
|
e++;
|
||
|
|
}
|
||
|
|
return a;
|
||
|
|
}
|