1 |
greg |
2.1 |
#ifndef lint |
2 |
schorsch |
2.8 |
static const char RCSid[] = "$Id: portio.c,v 2.7 2003/02/25 02:47:21 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
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/* |
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* Portable i/o for binary files |
6 |
greg |
2.6 |
* |
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* External symbols declared in standard.h |
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*/ |
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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 |
schorsch |
2.8 |
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14 |
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#include "rtio.h" |
15 |
greg |
2.1 |
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16 |
greg |
2.3 |
#ifndef frexp |
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extern double frexp(); |
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#endif |
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#ifndef ldexp |
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extern double ldexp(); |
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#endif |
22 |
greg |
2.1 |
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23 |
greg |
2.3 |
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24 |
greg |
2.6 |
void |
25 |
greg |
2.1 |
putstr(s, fp) /* write null-terminated string to fp */ |
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register char *s; |
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register FILE *fp; |
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{ |
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do |
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putc(*s, fp); |
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while (*s++); |
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} |
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35 |
greg |
2.6 |
void |
36 |
greg |
2.1 |
putint(i, siz, fp) /* write a siz-byte integer to fp */ |
37 |
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long i; |
38 |
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register int siz; |
39 |
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register FILE *fp; |
40 |
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{ |
41 |
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while (siz--) |
42 |
greg |
2.2 |
putc((int)(i>>(siz<<3) & 0xff), fp); |
43 |
greg |
2.1 |
} |
44 |
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45 |
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46 |
greg |
2.6 |
void |
47 |
greg |
2.1 |
putflt(f, fp) /* put out floating point number */ |
48 |
greg |
2.2 |
double f; |
49 |
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FILE *fp; |
50 |
greg |
2.1 |
{ |
51 |
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int e; |
52 |
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53 |
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putint((long)(frexp(f,&e)*0x7fffffff), 4, fp); |
54 |
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putint((long)e, 1, fp); |
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} |
56 |
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57 |
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58 |
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char * |
59 |
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getstr(s, fp) /* get null-terminated string */ |
60 |
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char *s; |
61 |
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register FILE *fp; |
62 |
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{ |
63 |
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register char *cp; |
64 |
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register int c; |
65 |
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66 |
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cp = s; |
67 |
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while ((c = getc(fp)) != EOF) |
68 |
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if ((*cp++ = c) == '\0') |
69 |
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return(s); |
70 |
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71 |
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return(NULL); |
72 |
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} |
73 |
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74 |
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75 |
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long |
76 |
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getint(siz, fp) /* get a siz-byte integer */ |
77 |
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int siz; |
78 |
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register FILE *fp; |
79 |
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{ |
80 |
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register int c; |
81 |
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register long r; |
82 |
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83 |
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if ((c = getc(fp)) == EOF) |
84 |
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return(EOF); |
85 |
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r = 0x80&c ? -1<<8|c : c; /* sign extend */ |
86 |
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while (--siz > 0) { |
87 |
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if ((c = getc(fp)) == EOF) |
88 |
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return(EOF); |
89 |
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r <<= 8; |
90 |
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r |= c; |
91 |
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} |
92 |
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return(r); |
93 |
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} |
94 |
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95 |
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96 |
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double |
97 |
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getflt(fp) /* get a floating point number */ |
98 |
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FILE *fp; |
99 |
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{ |
100 |
greg |
2.5 |
long l; |
101 |
greg |
2.2 |
double d; |
102 |
greg |
2.1 |
|
103 |
greg |
2.5 |
l = getint(4, fp); |
104 |
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d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff); |
105 |
greg |
2.1 |
return(ldexp(d, (int)getint(1, fp))); |
106 |
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} |