1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: portio.c,v 2.8 2003/07/17 09:21:29 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Portable i/o for binary files |
6 |
* |
7 |
* External symbols declared in standard.h |
8 |
*/ |
9 |
|
10 |
#include "copyright.h" |
11 |
|
12 |
#include <stdio.h> |
13 |
|
14 |
#include "rtio.h" |
15 |
|
16 |
#include <math.h> |
17 |
|
18 |
|
19 |
void |
20 |
putstr(s, fp) /* write null-terminated string to fp */ |
21 |
register char *s; |
22 |
register FILE *fp; |
23 |
{ |
24 |
do |
25 |
putc(*s, fp); |
26 |
while (*s++); |
27 |
} |
28 |
|
29 |
|
30 |
void |
31 |
putint(i, siz, fp) /* write a siz-byte integer to fp */ |
32 |
long i; |
33 |
register int siz; |
34 |
register FILE *fp; |
35 |
{ |
36 |
while (siz--) |
37 |
putc((int)(i>>(siz<<3) & 0xff), fp); |
38 |
} |
39 |
|
40 |
|
41 |
void |
42 |
putflt(f, fp) /* put out floating point number */ |
43 |
double f; |
44 |
FILE *fp; |
45 |
{ |
46 |
int e; |
47 |
|
48 |
putint((long)(frexp(f,&e)*0x7fffffff), 4, fp); |
49 |
putint((long)e, 1, fp); |
50 |
} |
51 |
|
52 |
|
53 |
char * |
54 |
getstr(s, fp) /* get null-terminated string */ |
55 |
char *s; |
56 |
register FILE *fp; |
57 |
{ |
58 |
register char *cp; |
59 |
register int c; |
60 |
|
61 |
cp = s; |
62 |
while ((c = getc(fp)) != EOF) |
63 |
if ((*cp++ = c) == '\0') |
64 |
return(s); |
65 |
|
66 |
return(NULL); |
67 |
} |
68 |
|
69 |
|
70 |
long |
71 |
getint(siz, fp) /* get a siz-byte integer */ |
72 |
int siz; |
73 |
register FILE *fp; |
74 |
{ |
75 |
register int c; |
76 |
register long r; |
77 |
|
78 |
if ((c = getc(fp)) == EOF) |
79 |
return(EOF); |
80 |
r = 0x80&c ? -1<<8|c : c; /* sign extend */ |
81 |
while (--siz > 0) { |
82 |
if ((c = getc(fp)) == EOF) |
83 |
return(EOF); |
84 |
r <<= 8; |
85 |
r |= c; |
86 |
} |
87 |
return(r); |
88 |
} |
89 |
|
90 |
|
91 |
double |
92 |
getflt(fp) /* get a floating point number */ |
93 |
FILE *fp; |
94 |
{ |
95 |
long l; |
96 |
double d; |
97 |
|
98 |
l = getint(4, fp); |
99 |
d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff); |
100 |
return(ldexp(d, (int)getint(1, fp))); |
101 |
} |