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
#	User	Rev	Content
1	greg	3.1	#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			}