src/common/portio.c

#ifndef lint
static const char       RCSid[] = "$Id: portio.c,v 2.8 2003/07/17 09:21:29 schorsch Exp $";
#endif
/*
 * Portable i/o for binary files
 *
 * External symbols declared in standard.h
 */

#include "copyright.h"

#include <stdio.h>

#include "rtio.h"

#include <math.h>


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


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


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

        putint((long)(frexp(f,&e)*0x7fffffff), 4, fp);
        putint((long)e, 1, fp);
}


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

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


long
getint(siz, fp)                 /* get a siz-byte integer */
int  siz;
register FILE  *fp;
{
        register int  c;
        register 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(fp)                      /* get a floating point number */
FILE  *fp;
{
        long    l;
        double  d;

        l = getint(4, fp);
        d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
        return(ldexp(d, (int)getint(1, fp)));
}
Revision:	2.9
Committed:	Thu Nov 13 16:42:17 2003 UTC (20 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.8:	+2 -7 lines
Log Message:	Added <math.h> include to get frexp() and ldexp() declarations
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.9	static const char RCSid[] = "$Id: portio.c,v 2.8 2003/07/17 09:21:29 schorsch Exp $";
3	greg	2.1	#endif
4			/*
5			* Portable i/o for binary files
6	greg	2.6	*
7			* External symbols declared in standard.h
8			*/
9
10	greg	2.7	#include "copyright.h"
11	greg	2.1
12			#include <stdio.h>
13	schorsch	2.8
14			#include "rtio.h"
15	greg	2.1
16	greg	2.9	#include <math.h>
17	greg	2.1
18	greg	2.3
19	greg	2.6	void
20	greg	2.1	putstr(s, fp) /* write null-terminated string to fp */
21			register char *s;
22			register FILE *fp;
23			{
24			do
25			putc(*s, fp);
26			while (*s++);
27			}
28
29
30	greg	2.6	void
31	greg	2.1	putint(i, siz, fp) /* write a siz-byte integer to fp */
32			long i;
33			register int siz;
34			register FILE *fp;
35			{
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	2.1	putflt(f, fp) /* put out floating point number */
43	greg	2.2	double f;
44			FILE *fp;
45	greg	2.1	{
46			int e;
47
48			putint((long)(frexp(f,&e)*0x7fffffff), 4, fp);
49			putint((long)e, 1, fp);
50			}
51
52
53			char *
54			getstr(s, fp) /* get null-terminated string */
55			char *s;
56			register FILE *fp;
57			{
58			register char *cp;
59			register int c;
60
61			cp = s;
62			while ((c = getc(fp)) != EOF)
63			if ((*cp++ = c) == '\0')
64			return(s);
65
66			return(NULL);
67			}
68
69
70			long
71			getint(siz, fp) /* get a siz-byte integer */
72			int siz;
73			register FILE *fp;
74			{
75			register int c;
76			register long r;
77
78			if ((c = getc(fp)) == EOF)
79			return(EOF);
80			r = 0x80&c ? -1<<8\|c : c; /* sign extend */
81			while (--siz > 0) {
82			if ((c = getc(fp)) == EOF)
83			return(EOF);
84			r <<= 8;
85			r \|= c;
86			}
87			return(r);
88			}
89
90
91			double
92			getflt(fp) /* get a floating point number */
93			FILE *fp;
94			{
95	greg	2.5	long l;
96	greg	2.2	double d;
97	greg	2.1
98	greg	2.5	l = getint(4, fp);
99			d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
100	greg	2.1	return(ldexp(d, (int)getint(1, fp)));
101			}