src/common/portio.c

#ifndef lint
static const char       RCSid[] = "$Id: portio.c,v 2.16 2016/03/03 22:06:18 greg Exp $";
#endif
/*
 * Portable i/o for binary files
 *
 * External symbols declared in rtio.h
 */

#include "copyright.h"

#include "rtio.h"

#include <math.h>


void
putstr(                         /* write null-terminated string to fp */
        char  *s,
        FILE  *fp
)
{
        do
                putc(*s, fp);
        while (*s++);
}


void
putint(                         /* write a siz-byte integer to fp */
        long  i,
        int  siz,
        FILE  *fp
)
{
        while (siz--)
                putc((int)(i>>(siz<<3) & 0xff), fp);
}


void
putflt(                         /* put out floating point number */
        double  f,
        FILE  *fp
)
{
        long  m;
        int  e;

        m = frexp(f, &e) * 0x7fffffff;
        if (e > 127) {                  /* overflow */
                m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff;
                e = 127;
        } else if (e < -128) {          /* underflow */
                m = 0;
                e = 0;
        }
        putint(m, 4, fp);
        putint((long)e, 1, fp);
}


int
putbinary(                      /* fwrite() replacement for small objects */
        char *s,
        int elsiz,
        int nel,
        FILE *fp)
{
        int     nbytes = elsiz*nel;

        if (nbytes > 512)
                return(fwrite(s, elsiz, nel, fp));
        
        while (nbytes-- > 0)
                putc(*s++, fp);

        return(nel);
}


char *
getstr(                         /* get null-terminated string */
        char  *s,
        FILE  *fp
)
{
        char  *cp;
        int  c;

        cp = s;
        while ((c = getc(fp)) != EOF)
                if ((*cp++ = c) == '\0')
                        return(s);
                
        return(NULL);
}


long
getint(                         /* get a siz-byte integer */
        int  siz,
        FILE  *fp
)
{
        int  c;
        long  r;

        if ((c = getc(fp)) == EOF)
                return(EOF);
        r = 0x80&c ? -1<<8|c : c;               /* sign extend */
        while (--siz > 0) {
                if ((c = getc(fp)) == EOF)
                        return(EOF);
                r <<= 8;
                r |= c;
        }
        return(r);
}


double
getflt(                         /* get a floating point number */
        FILE  *fp
)
{
        long    l;
        double  d;

        l = getint(4, fp);
        if (l == EOF && feof(fp))       /* EOF? */
                return((double)EOF);
        if (l == 0) {
                getc(fp);               /* exactly zero -- ignore exponent */
                return(0.0);
        }
        d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
        return(ldexp(d, (int)getint(1, fp)));
}


int
getbinary(                      /* fread() replacement for small objects */
        char *s,
        int elsiz,
        int nel,
        FILE *fp)
{
        int     nbytes = elsiz*nel;
        int     c;

        if (nbytes > 512)
                return(fread(s, elsiz, nel, fp));
        
        while (nbytes-- > 0) {
                if ((c = getc(fp)) == EOF)
                        return((elsiz*nel - nbytes)/elsiz);
                *s++ = c;
        }
        return(nel);
}
Revision:	2.17
Committed:	Thu Mar 3 22:09:59 2016 UTC (8 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.16:	+1 -8 lines
Log Message:	Moved putc and getc overrides to rtio.h
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.17	static const char RCSid[] = "$Id: portio.c,v 2.16 2016/03/03 22:06:18 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Portable i/o for binary files
6	greg	2.6	*
7	greg	2.14	* External symbols declared in rtio.h
8	greg	2.6	*/
9
10	greg	2.7	#include "copyright.h"
11	greg	2.1
12	schorsch	2.8	#include "rtio.h"
13	greg	2.1
14	greg	2.9	#include <math.h>
15	greg	2.10
16	greg	2.3
17	greg	2.6	void
18	greg	2.15	putstr( /* write null-terminated string to fp */
19			char *s,
20			FILE *fp
21			)
22	greg	2.1	{
23			do
24			putc(*s, fp);
25			while (*s++);
26			}
27
28
29	greg	2.6	void
30	greg	2.15	putint( /* write a siz-byte integer to fp */
31			long i,
32			int siz,
33			FILE *fp
34			)
35	greg	2.1	{
36			while (siz--)
37	greg	2.2	putc((int)(i>>(siz<<3) & 0xff), fp);
38	greg	2.1	}
39
40
41	greg	2.6	void
42	greg	2.15	putflt( /* put out floating point number */
43			double f,
44			FILE *fp
45			)
46	greg	2.1	{
47	greg	2.13	long m;
48	greg	2.1	int e;
49
50	greg	2.13	m = frexp(f, &e) * 0x7fffffff;
51			if (e > 127) { /* overflow */
52			m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff;
53			e = 127;
54			} else if (e < -128) { /* underflow */
55			m = 0;
56			e = 0;
57			}
58			putint(m, 4, fp);
59	greg	2.1	putint((long)e, 1, fp);
60			}
61
62
63	greg	2.16	int
64			putbinary( /* fwrite() replacement for small objects */
65			char *s,
66			int elsiz,
67			int nel,
68			FILE *fp)
69			{
70			int nbytes = elsiz*nel;
71
72			if (nbytes > 512)
73			return(fwrite(s, elsiz, nel, fp));
74
75			while (nbytes-- > 0)
76			putc(*s++, fp);
77
78			return(nel);
79			}
80
81
82	greg	2.1	char *
83	greg	2.15	getstr( /* get null-terminated string */
84			char *s,
85			FILE *fp
86			)
87	greg	2.1	{
88	greg	2.15	char *cp;
89			int c;
90	greg	2.1
91			cp = s;
92			while ((c = getc(fp)) != EOF)
93			if ((*cp++ = c) == '\0')
94			return(s);
95
96			return(NULL);
97			}
98
99
100			long
101	greg	2.15	getint( /* get a siz-byte integer */
102			int siz,
103			FILE *fp
104			)
105	greg	2.1	{
106	greg	2.15	int c;
107			long r;
108	greg	2.1
109			if ((c = getc(fp)) == EOF)
110			return(EOF);
111			r = 0x80&c ? -1<<8\|c : c; /* sign extend */
112			while (--siz > 0) {
113			if ((c = getc(fp)) == EOF)
114			return(EOF);
115			r <<= 8;
116			r \|= c;
117			}
118			return(r);
119			}
120
121
122			double
123	greg	2.15	getflt( /* get a floating point number */
124			FILE *fp
125			)
126	greg	2.1	{
127	greg	2.5	long l;
128	greg	2.2	double d;
129	greg	2.1
130	greg	2.5	l = getint(4, fp);
131	greg	2.15	if (l == EOF && feof(fp)) /* EOF? */
132			return((double)EOF);
133	greg	2.12	if (l == 0) {
134			getc(fp); /* exactly zero -- ignore exponent */
135			return(0.0);
136			}
137	greg	2.5	d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
138	greg	2.1	return(ldexp(d, (int)getint(1, fp)));
139			}
140	greg	2.16
141
142			int
143			getbinary( /* fread() replacement for small objects */
144			char *s,
145			int elsiz,
146			int nel,
147			FILE *fp)
148			{
149			int nbytes = elsiz*nel;
150			int c;
151
152			if (nbytes > 512)
153			return(fread(s, elsiz, nel, fp));
154
155			while (nbytes-- > 0) {
156			if ((c = getc(fp)) == EOF)
157			return((elsiz*nel - nbytes)/elsiz);
158			*s++ = c;
159			}
160			return(nel);
161			}