src/common/preadwrite.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 * Substitute routines for pread(2) and pwrite(2)
 */

extern off_t    lseek();


int
pread(fd, buf, siz, offs)       /* read buffer from an open file */
int     fd;
char    *buf;
unsigned int    siz;
long    pos;
{
        if (lseek(fd, (off_t)offs, 0) != offs)
                return(-1);
        return(read(fd, buf, siz));
                                /* technically, we should reset pointer here */
}


int
pwrite(fd, buf, siz, offs)      /* write buffer to an open file */
int     fd;
char    *buf;
unsigned int    siz;
long    pos;
{
        if (lseek(fd, (off_t)offs, 0) != offs)
                return(-1);
        return(write(fd, buf, siz));
                                /* technically, we should reset pointer here */
}
Revision:	3.1
Committed:	Sat Feb 22 02:07:22 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id$";
3	#endif
4	/*
5	* Substitute routines for pread(2) and pwrite(2)
6	*/
7
8	extern off_t lseek();
9
10
11	int
12	pread(fd, buf, siz, offs) /* read buffer from an open file */
13	int fd;
14	char *buf;
15	unsigned int siz;
16	long pos;
17	{
18	if (lseek(fd, (off_t)offs, 0) != offs)
19	return(-1);
20	return(read(fd, buf, siz));
21	/* technically, we should reset pointer here */
22	}
23
24
25	int
26	pwrite(fd, buf, siz, offs) /* write buffer to an open file */
27	int fd;
28	char *buf;
29	unsigned int siz;
30	long pos;
31	{
32	if (lseek(fd, (off_t)offs, 0) != offs)
33	return(-1);
34	return(write(fd, buf, siz));
35	/* technically, we should reset pointer here */
36	}