79 lines
1.3 KiB
C
79 lines
1.3 KiB
C
/* $Header$ */
|
|
/*
|
|
* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
*
|
|
* This product is part of the Amsterdam Compiler Kit.
|
|
*
|
|
* Permission to use, sell, duplicate or disclose this software must be
|
|
* obtained in writing. Requests for such permissions may be sent to
|
|
*
|
|
* Dr. Andrew S. Tanenbaum
|
|
* Wiskundig Seminarium
|
|
* Vrije Universiteit
|
|
* Postbox 7161
|
|
* 1007 MC Amsterdam
|
|
* The Netherlands
|
|
*
|
|
*/
|
|
|
|
/* Author: J.W. Stevenson */
|
|
|
|
#include <pc_file.h>
|
|
|
|
#define BIG 1e17
|
|
|
|
extern _rf();
|
|
extern _incpt();
|
|
extern _skipsp();
|
|
extern int _getsig();
|
|
extern int _getint();
|
|
extern int _fstdig();
|
|
extern int _nxtdig();
|
|
|
|
static double r;
|
|
static int pow10;
|
|
|
|
static dig(ch) int ch; {
|
|
|
|
if (r>BIG)
|
|
pow10++;
|
|
else
|
|
r = r*10.0 + ch;
|
|
}
|
|
|
|
double _rdr(f) struct file *f; {
|
|
int i; double e; int is_signed,ch;
|
|
|
|
r = 0;
|
|
pow10 = 0;
|
|
_rf(f);
|
|
_skipsp(f);
|
|
is_signed = _getsig(f);
|
|
ch = _fstdig(f);
|
|
do
|
|
dig(ch);
|
|
while ((ch = _nxtdig(f)) >= 0);
|
|
if (*f->ptr == '.') {
|
|
_incpt(f);
|
|
ch = _fstdig(f);
|
|
do {
|
|
dig(ch);
|
|
pow10--;
|
|
} while ((ch = _nxtdig(f)) >= 0);
|
|
}
|
|
if ((*f->ptr == 'e') || (*f->ptr == 'E')) {
|
|
_incpt(f);
|
|
pow10 += _getint(f);
|
|
}
|
|
if ((i = pow10) < 0)
|
|
i = -i;
|
|
e = 1.0;
|
|
while (--i >= 0)
|
|
e *= 10.0;
|
|
if (pow10<0)
|
|
r /= e;
|
|
else
|
|
r *= e;
|
|
return(is_signed? -r : r);
|
|
}
|