1 /*-
2 * Copyright (c) 1980 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * %sccs.include.proprietary.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)fseek_.c 5.2 (Berkeley) 04/12/91";
10 #endif /* not lint */
11
12 /*
13 * position a file associated with a fortran logical unit
14 *
15 * calling sequence:
16 * ierror = fseek(lunit, ioff, ifrom)
17 * where:
18 * lunit is an open logical unit
19 * ioff is an offset in bytes relative to the position specified by ifrom
20 * ifrom - 0 means 'beginning of the file'
21 * - 1 means 'the current position'
22 * - 2 means 'the end of the file'
23 * ierror will be 0 if successful, a system error code otherwise.
24 */
25
26 #include <stdio.h>
27 #include "../libI77/f_errno.h"
28 #include "../libI77/fiodefs.h"
29
30 extern unit units[];
31
fseek_(lu,off,from)32 long fseek_(lu, off, from)
33 long *lu, *off, *from;
34 {
35 if (*lu < 0 || *lu >= MXUNIT)
36 return((long)(errno=F_ERUNIT));
37 if (*from < 0 || *from > 2)
38 return((long)(errno=F_ERARG));
39 if (!units[*lu].ufd)
40 return((long)(errno=F_ERNOPEN));
41 if (fseek(units[*lu].ufd, *off, (int)*from) < 0)
42 return((long)errno);
43 return(0L);
44 }
45