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greg |
2.1 |
#ifndef lint |
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greg |
2.15 |
static const char RCSid[] = "$Id: portio.c,v 2.14 2006/12/23 17:27:45 greg Exp $"; |
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greg |
2.1 |
#endif |
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/* |
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* Portable i/o for binary files |
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greg |
2.6 |
* |
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greg |
2.14 |
* External symbols declared in rtio.h |
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greg |
2.6 |
*/ |
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greg |
2.7 |
#include "copyright.h" |
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greg |
2.1 |
|
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schorsch |
2.8 |
#include "rtio.h" |
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greg |
2.1 |
|
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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23 |
greg |
2.3 |
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greg |
2.6 |
void |
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greg |
2.15 |
putstr( /* write null-terminated string to fp */ |
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char *s, |
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FILE *fp |
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) |
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greg |
2.1 |
{ |
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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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greg |
2.6 |
void |
37 |
greg |
2.15 |
putint( /* write a siz-byte integer to fp */ |
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long i, |
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int siz, |
40 |
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FILE *fp |
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) |
42 |
greg |
2.1 |
{ |
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while (siz--) |
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greg |
2.2 |
putc((int)(i>>(siz<<3) & 0xff), fp); |
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greg |
2.1 |
} |
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greg |
2.6 |
void |
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greg |
2.15 |
putflt( /* put out floating point number */ |
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double f, |
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FILE *fp |
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) |
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greg |
2.1 |
{ |
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greg |
2.13 |
long m; |
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greg |
2.1 |
int e; |
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greg |
2.13 |
m = frexp(f, &e) * 0x7fffffff; |
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if (e > 127) { /* overflow */ |
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m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff; |
60 |
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e = 127; |
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} else if (e < -128) { /* underflow */ |
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m = 0; |
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e = 0; |
64 |
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} |
65 |
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putint(m, 4, fp); |
66 |
greg |
2.1 |
putint((long)e, 1, fp); |
67 |
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} |
68 |
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69 |
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char * |
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greg |
2.15 |
getstr( /* get null-terminated string */ |
72 |
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char *s, |
73 |
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FILE *fp |
74 |
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) |
75 |
greg |
2.1 |
{ |
76 |
greg |
2.15 |
char *cp; |
77 |
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int c; |
78 |
greg |
2.1 |
|
79 |
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cp = s; |
80 |
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while ((c = getc(fp)) != EOF) |
81 |
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if ((*cp++ = c) == '\0') |
82 |
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return(s); |
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84 |
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return(NULL); |
85 |
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} |
86 |
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87 |
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88 |
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long |
89 |
greg |
2.15 |
getint( /* get a siz-byte integer */ |
90 |
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int siz, |
91 |
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FILE *fp |
92 |
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) |
93 |
greg |
2.1 |
{ |
94 |
greg |
2.15 |
int c; |
95 |
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long r; |
96 |
greg |
2.1 |
|
97 |
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if ((c = getc(fp)) == EOF) |
98 |
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return(EOF); |
99 |
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r = 0x80&c ? -1<<8|c : c; /* sign extend */ |
100 |
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while (--siz > 0) { |
101 |
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if ((c = getc(fp)) == EOF) |
102 |
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return(EOF); |
103 |
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r <<= 8; |
104 |
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r |= c; |
105 |
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} |
106 |
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return(r); |
107 |
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} |
108 |
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109 |
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110 |
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double |
111 |
greg |
2.15 |
getflt( /* get a floating point number */ |
112 |
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FILE *fp |
113 |
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) |
114 |
greg |
2.1 |
{ |
115 |
greg |
2.5 |
long l; |
116 |
greg |
2.2 |
double d; |
117 |
greg |
2.1 |
|
118 |
greg |
2.5 |
l = getint(4, fp); |
119 |
greg |
2.15 |
if (l == EOF && feof(fp)) /* EOF? */ |
120 |
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return((double)EOF); |
121 |
greg |
2.12 |
if (l == 0) { |
122 |
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getc(fp); /* exactly zero -- ignore exponent */ |
123 |
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return(0.0); |
124 |
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} |
125 |
greg |
2.5 |
d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff); |
126 |
greg |
2.1 |
return(ldexp(d, (int)getint(1, fp))); |
127 |
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} |