src/common/portio.c

#ifndef lint
static const char       RCSid[] = "$Id: portio.c,v 2.23 2021/01/15 18:31:38 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 > sizeof(long)) {
                putc((i<0)*0xff, fp);
                siz--;
        }
        siz <<= 3;
        while ((siz -= 8) > 0)
                putc((int)(i>>siz & 0xff), fp);
        putc((int)(i & 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(e, 1, fp);
}


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

        if (nbytes > 128)
                return(fwrite(p, elsiz, nel, fp));
        
        while (nbytes-- > 0)
                if (putc(*s++, fp) == EOF)
                        return((elsiz*nel - nbytes)/elsiz);

        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 = c;
        if (c & 0x80)           /* sign extend? */
                r |= ~255L;
        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)));
}


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

        if (nbytes > 128)
                return(fread(p, elsiz, nel, fp));
        
        while (nbytes-- > 0) {
                if ((c = getc(fp)) == EOF)
                        return((elsiz*nel - nbytes)/elsiz);
                *s++ = c;
        }
        return(nel);
}
Revision:	2.24
Committed:	Fri Feb 19 02:59:32 2021 UTC (3 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.23:	+8 -2 lines
Log Message:	fix: added handling of writing longer long's that architecture supports
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.24	static const char RCSid[] = "$Id: portio.c,v 2.23 2021/01/15 18:31:38 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	greg	2.24	while (siz > sizeof(long)) {
37			putc((i<0)*0xff, fp);
38			siz--;
39			}
40	greg	2.18	siz <<= 3;
41	greg	2.22	while ((siz -= 8) > 0)
42	greg	2.18	putc((int)(i>>siz & 0xff), fp);
43	greg	2.22	putc((int)(i & 0xff), fp);
44	greg	2.1	}
45
46
47	greg	2.6	void
48	greg	2.15	putflt( /* put out floating point number */
49			double f,
50			FILE *fp
51			)
52	greg	2.1	{
53	greg	2.13	long m;
54	greg	2.1	int e;
55
56	greg	2.13	m = frexp(f, &e) * 0x7fffffff;
57			if (e > 127) { /* overflow */
58			m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff;
59			e = 127;
60			} else if (e < -128) { /* underflow */
61			m = 0;
62			e = 0;
63			}
64			putint(m, 4, fp);
65	greg	2.22	putint(e, 1, fp);
66	greg	2.1	}
67
68
69	greg	2.23	size_t
70	greg	2.16	putbinary( /* fwrite() replacement for small objects */
71	greg	2.19	const void *p,
72	greg	2.23	size_t elsiz,
73			size_t nel,
74	greg	2.16	FILE *fp)
75			{
76	greg	2.19	const char s = (const char )p;
77	greg	2.23	size_t nbytes = elsiz*nel;
78	greg	2.16
79	greg	2.22	if (nbytes > 128)
80	greg	2.19	return(fwrite(p, elsiz, nel, fp));
81	greg	2.16
82			while (nbytes-- > 0)
83	greg	2.21	if (putc(*s++, fp) == EOF)
84			return((elsiz*nel - nbytes)/elsiz);
85	greg	2.16
86			return(nel);
87			}
88
89
90	greg	2.1	char *
91	greg	2.15	getstr( /* get null-terminated string */
92			char *s,
93			FILE *fp
94			)
95	greg	2.1	{
96	greg	2.15	char *cp;
97			int c;
98	greg	2.1
99			cp = s;
100			while ((c = getc(fp)) != EOF)
101			if ((*cp++ = c) == '\0')
102			return(s);
103
104			return(NULL);
105			}
106
107
108			long
109	greg	2.15	getint( /* get a siz-byte integer */
110			int siz,
111			FILE *fp
112			)
113	greg	2.1	{
114	greg	2.15	int c;
115			long r;
116	greg	2.1
117			if ((c = getc(fp)) == EOF)
118			return(EOF);
119	greg	2.24	r = c;
120			if (c & 0x80) /* sign extend? */
121			r \|= ~255L;
122	greg	2.1	while (--siz > 0) {
123			if ((c = getc(fp)) == EOF)
124			return(EOF);
125			r <<= 8;
126			r \|= c;
127			}
128			return(r);
129			}
130
131
132			double
133	greg	2.15	getflt( /* get a floating point number */
134			FILE *fp
135			)
136	greg	2.1	{
137	greg	2.5	long l;
138	greg	2.2	double d;
139	greg	2.1
140	greg	2.5	l = getint(4, fp);
141	greg	2.15	if (l == EOF && feof(fp)) /* EOF? */
142			return((double)EOF);
143	greg	2.12	if (l == 0) {
144			getc(fp); /* exactly zero -- ignore exponent */
145			return(0.0);
146			}
147	greg	2.5	d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
148	greg	2.1	return(ldexp(d, (int)getint(1, fp)));
149			}
150	greg	2.16
151
152	greg	2.23	size_t
153	greg	2.16	getbinary( /* fread() replacement for small objects */
154	greg	2.19	void *p,
155	greg	2.23	size_t elsiz,
156			size_t nel,
157	greg	2.16	FILE *fp)
158			{
159	greg	2.19	char s = (char )p;
160	greg	2.23	size_t nbytes = elsiz*nel;
161	greg	2.16	int c;
162
163	greg	2.22	if (nbytes > 128)
164	greg	2.19	return(fread(p, elsiz, nel, fp));
165	greg	2.16
166			while (nbytes-- > 0) {
167			if ((c = getc(fp)) == EOF)
168			return((elsiz*nel - nbytes)/elsiz);
169			*s++ = c;
170			}
171			return(nel);
172			}