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greg |
2.1 |
#ifndef lint |
2 |
greg |
2.14 |
static const char RCSid[] = "$Id: portio.c,v 2.13 2005/05/03 05:10:13 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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greg |
2.14 |
* External symbols declared in rtio.h |
8 |
greg |
2.6 |
*/ |
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greg |
2.7 |
#include "copyright.h" |
11 |
greg |
2.1 |
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schorsch |
2.8 |
#include "rtio.h" |
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greg |
2.1 |
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14 |
greg |
2.9 |
#include <math.h> |
15 |
greg |
2.10 |
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16 |
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#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
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greg |
2.11 |
#undef getc |
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#undef putc |
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greg |
2.10 |
#define getc getc_unlocked |
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#define putc putc_unlocked |
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#endif |
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greg |
2.1 |
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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; |
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register FILE *fp; |
40 |
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{ |
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while (siz--) |
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greg |
2.2 |
putc((int)(i>>(siz<<3) & 0xff), fp); |
43 |
greg |
2.1 |
} |
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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 |
greg |
2.13 |
long m; |
52 |
greg |
2.1 |
int e; |
53 |
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greg |
2.13 |
m = frexp(f, &e) * 0x7fffffff; |
55 |
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if (e > 127) { /* overflow */ |
56 |
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m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff; |
57 |
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e = 127; |
58 |
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} else if (e < -128) { /* underflow */ |
59 |
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m = 0; |
60 |
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e = 0; |
61 |
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} |
62 |
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putint(m, 4, fp); |
63 |
greg |
2.1 |
putint((long)e, 1, fp); |
64 |
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} |
65 |
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66 |
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67 |
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char * |
68 |
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getstr(s, fp) /* get null-terminated string */ |
69 |
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char *s; |
70 |
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register FILE *fp; |
71 |
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{ |
72 |
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register char *cp; |
73 |
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register int c; |
74 |
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75 |
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cp = s; |
76 |
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while ((c = getc(fp)) != EOF) |
77 |
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if ((*cp++ = c) == '\0') |
78 |
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return(s); |
79 |
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80 |
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return(NULL); |
81 |
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} |
82 |
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83 |
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84 |
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long |
85 |
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getint(siz, fp) /* get a siz-byte integer */ |
86 |
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int siz; |
87 |
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register FILE *fp; |
88 |
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{ |
89 |
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register int c; |
90 |
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register long r; |
91 |
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92 |
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if ((c = getc(fp)) == EOF) |
93 |
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return(EOF); |
94 |
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r = 0x80&c ? -1<<8|c : c; /* sign extend */ |
95 |
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while (--siz > 0) { |
96 |
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if ((c = getc(fp)) == EOF) |
97 |
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return(EOF); |
98 |
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r <<= 8; |
99 |
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r |= c; |
100 |
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} |
101 |
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return(r); |
102 |
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} |
103 |
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104 |
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105 |
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double |
106 |
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getflt(fp) /* get a floating point number */ |
107 |
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FILE *fp; |
108 |
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{ |
109 |
greg |
2.5 |
long l; |
110 |
greg |
2.2 |
double d; |
111 |
greg |
2.1 |
|
112 |
greg |
2.5 |
l = getint(4, fp); |
113 |
greg |
2.12 |
if (l == 0) { |
114 |
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getc(fp); /* exactly zero -- ignore exponent */ |
115 |
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return(0.0); |
116 |
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} |
117 |
greg |
2.5 |
d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff); |
118 |
greg |
2.1 |
return(ldexp(d, (int)getint(1, fp))); |
119 |
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} |