| 4 |
|
/* |
| 5 |
|
* Portable i/o for binary files |
| 6 |
|
* |
| 7 |
< |
* External symbols declared in standard.h |
| 7 |
> |
* External symbols declared in rtio.h |
| 8 |
|
*/ |
| 9 |
|
|
| 10 |
|
#include "copyright.h" |
| 11 |
|
|
| 12 |
< |
#include <stdio.h> |
| 12 |
> |
#include "rtio.h" |
| 13 |
|
|
| 14 |
< |
#ifndef frexp |
| 15 |
< |
extern double frexp(); |
| 14 |
> |
#include <math.h> |
| 15 |
> |
|
| 16 |
> |
#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
| 17 |
> |
#undef getc |
| 18 |
> |
#undef putc |
| 19 |
> |
#define getc getc_unlocked |
| 20 |
> |
#define putc putc_unlocked |
| 21 |
|
#endif |
| 17 |
– |
#ifndef ldexp |
| 18 |
– |
extern double ldexp(); |
| 19 |
– |
#endif |
| 22 |
|
|
| 23 |
|
|
| 24 |
|
void |
| 48 |
|
double f; |
| 49 |
|
FILE *fp; |
| 50 |
|
{ |
| 51 |
+ |
long m; |
| 52 |
|
int e; |
| 53 |
|
|
| 54 |
< |
putint((long)(frexp(f,&e)*0x7fffffff), 4, fp); |
| 54 |
> |
m = frexp(f, &e) * 0x7fffffff; |
| 55 |
> |
if (e > 127) { /* overflow */ |
| 56 |
> |
m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff; |
| 57 |
> |
e = 127; |
| 58 |
> |
} else if (e < -128) { /* underflow */ |
| 59 |
> |
m = 0; |
| 60 |
> |
e = 0; |
| 61 |
> |
} |
| 62 |
> |
putint(m, 4, fp); |
| 63 |
|
putint((long)e, 1, fp); |
| 64 |
|
} |
| 65 |
|
|
| 110 |
|
double d; |
| 111 |
|
|
| 112 |
|
l = getint(4, fp); |
| 113 |
+ |
if (l == 0) { |
| 114 |
+ |
getc(fp); /* exactly zero -- ignore exponent */ |
| 115 |
+ |
return(0.0); |
| 116 |
+ |
} |
| 117 |
|
d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff); |
| 118 |
|
return(ldexp(d, (int)getint(1, fp))); |
| 119 |
|
} |
