1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.12 |
static const char RCSid[] = "$Id: portio.c,v 2.11 2004/09/14 02:53:50 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
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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> |
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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 |
2.9 |
#include <math.h> |
17 |
greg |
2.10 |
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18 |
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#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
19 |
greg |
2.11 |
#undef getc |
20 |
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#undef putc |
21 |
greg |
2.10 |
#define getc getc_unlocked |
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#define putc putc_unlocked |
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#endif |
24 |
greg |
2.1 |
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25 |
greg |
2.3 |
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26 |
greg |
2.6 |
void |
27 |
greg |
2.1 |
putstr(s, fp) /* write null-terminated string to fp */ |
28 |
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register char *s; |
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register FILE *fp; |
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{ |
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do |
32 |
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putc(*s, fp); |
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while (*s++); |
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} |
35 |
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36 |
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37 |
greg |
2.6 |
void |
38 |
greg |
2.1 |
putint(i, siz, fp) /* write a siz-byte integer to fp */ |
39 |
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long i; |
40 |
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register int siz; |
41 |
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register FILE *fp; |
42 |
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{ |
43 |
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while (siz--) |
44 |
greg |
2.2 |
putc((int)(i>>(siz<<3) & 0xff), fp); |
45 |
greg |
2.1 |
} |
46 |
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47 |
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48 |
greg |
2.6 |
void |
49 |
greg |
2.1 |
putflt(f, fp) /* put out floating point number */ |
50 |
greg |
2.2 |
double f; |
51 |
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FILE *fp; |
52 |
greg |
2.1 |
{ |
53 |
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int e; |
54 |
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55 |
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putint((long)(frexp(f,&e)*0x7fffffff), 4, fp); |
56 |
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putint((long)e, 1, fp); |
57 |
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} |
58 |
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59 |
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60 |
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char * |
61 |
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getstr(s, fp) /* get null-terminated string */ |
62 |
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char *s; |
63 |
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register FILE *fp; |
64 |
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{ |
65 |
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register char *cp; |
66 |
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register int c; |
67 |
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68 |
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cp = s; |
69 |
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while ((c = getc(fp)) != EOF) |
70 |
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if ((*cp++ = c) == '\0') |
71 |
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return(s); |
72 |
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73 |
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return(NULL); |
74 |
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} |
75 |
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76 |
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77 |
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long |
78 |
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getint(siz, fp) /* get a siz-byte integer */ |
79 |
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int siz; |
80 |
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register FILE *fp; |
81 |
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{ |
82 |
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register int c; |
83 |
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register long r; |
84 |
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85 |
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if ((c = getc(fp)) == EOF) |
86 |
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return(EOF); |
87 |
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r = 0x80&c ? -1<<8|c : c; /* sign extend */ |
88 |
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while (--siz > 0) { |
89 |
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if ((c = getc(fp)) == EOF) |
90 |
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return(EOF); |
91 |
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r <<= 8; |
92 |
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r |= c; |
93 |
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} |
94 |
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return(r); |
95 |
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} |
96 |
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97 |
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98 |
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double |
99 |
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getflt(fp) /* get a floating point number */ |
100 |
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FILE *fp; |
101 |
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{ |
102 |
greg |
2.5 |
long l; |
103 |
greg |
2.2 |
double d; |
104 |
greg |
2.1 |
|
105 |
greg |
2.5 |
l = getint(4, fp); |
106 |
greg |
2.12 |
if (l == 0) { |
107 |
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getc(fp); /* exactly zero -- ignore exponent */ |
108 |
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return(0.0); |
109 |
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} |
110 |
greg |
2.5 |
d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff); |
111 |
greg |
2.1 |
return(ldexp(d, (int)getint(1, fp))); |
112 |
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} |