1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.6 |
static const char RCSid[] = "$Id$"; |
3 |
greg |
2.1 |
#endif |
4 |
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/* |
5 |
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* Portable i/o for binary files |
6 |
greg |
2.6 |
* |
7 |
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* External symbols declared in standard.h |
8 |
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*/ |
9 |
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10 |
greg |
2.7 |
#include "copyright.h" |
11 |
greg |
2.1 |
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12 |
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#include <stdio.h> |
13 |
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14 |
greg |
2.3 |
#ifndef frexp |
15 |
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extern double frexp(); |
16 |
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#endif |
17 |
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#ifndef ldexp |
18 |
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extern double ldexp(); |
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#endif |
20 |
greg |
2.1 |
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21 |
greg |
2.3 |
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22 |
greg |
2.6 |
void |
23 |
greg |
2.1 |
putstr(s, fp) /* write null-terminated string to fp */ |
24 |
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register char *s; |
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register FILE *fp; |
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{ |
27 |
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do |
28 |
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putc(*s, fp); |
29 |
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while (*s++); |
30 |
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} |
31 |
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32 |
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33 |
greg |
2.6 |
void |
34 |
greg |
2.1 |
putint(i, siz, fp) /* write a siz-byte integer to fp */ |
35 |
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long i; |
36 |
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register int siz; |
37 |
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register FILE *fp; |
38 |
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{ |
39 |
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while (siz--) |
40 |
greg |
2.2 |
putc((int)(i>>(siz<<3) & 0xff), fp); |
41 |
greg |
2.1 |
} |
42 |
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43 |
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44 |
greg |
2.6 |
void |
45 |
greg |
2.1 |
putflt(f, fp) /* put out floating point number */ |
46 |
greg |
2.2 |
double f; |
47 |
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FILE *fp; |
48 |
greg |
2.1 |
{ |
49 |
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int e; |
50 |
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51 |
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putint((long)(frexp(f,&e)*0x7fffffff), 4, fp); |
52 |
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putint((long)e, 1, fp); |
53 |
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} |
54 |
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55 |
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56 |
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char * |
57 |
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getstr(s, fp) /* get null-terminated string */ |
58 |
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char *s; |
59 |
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register FILE *fp; |
60 |
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{ |
61 |
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register char *cp; |
62 |
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register int c; |
63 |
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64 |
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cp = s; |
65 |
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while ((c = getc(fp)) != EOF) |
66 |
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if ((*cp++ = c) == '\0') |
67 |
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return(s); |
68 |
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69 |
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return(NULL); |
70 |
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} |
71 |
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72 |
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73 |
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long |
74 |
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getint(siz, fp) /* get a siz-byte integer */ |
75 |
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int siz; |
76 |
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register FILE *fp; |
77 |
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{ |
78 |
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register int c; |
79 |
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register long r; |
80 |
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81 |
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if ((c = getc(fp)) == EOF) |
82 |
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return(EOF); |
83 |
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r = 0x80&c ? -1<<8|c : c; /* sign extend */ |
84 |
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while (--siz > 0) { |
85 |
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if ((c = getc(fp)) == EOF) |
86 |
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return(EOF); |
87 |
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r <<= 8; |
88 |
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r |= c; |
89 |
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} |
90 |
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return(r); |
91 |
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} |
92 |
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93 |
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94 |
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double |
95 |
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getflt(fp) /* get a floating point number */ |
96 |
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FILE *fp; |
97 |
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{ |
98 |
greg |
2.5 |
long l; |
99 |
greg |
2.2 |
double d; |
100 |
greg |
2.1 |
|
101 |
greg |
2.5 |
l = getint(4, fp); |
102 |
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d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff); |
103 |
greg |
2.1 |
return(ldexp(d, (int)getint(1, fp))); |
104 |
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} |