Commit | Line | Data |
---|---|---|
d030ca6c | 1 | /* |
161423a6 RE |
2 | * Copyright (c) 1980 Regents of the University of California. |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
d030ca6c | 5 | * |
161423a6 RE |
6 | * @(#)fseek_.c 5.1 %G% |
7 | */ | |
8 | ||
9 | /* | |
d030ca6c DW |
10 | * position a file associated with a fortran logical unit |
11 | * | |
12 | * calling sequence: | |
13 | * ierror = fseek(lunit, ioff, ifrom) | |
14 | * where: | |
15 | * lunit is an open logical unit | |
16 | * ioff is an offset in bytes relative to the position specified by ifrom | |
17 | * ifrom - 0 means 'beginning of the file' | |
18 | * - 1 means 'the current position' | |
19 | * - 2 means 'the end of the file' | |
20 | * ierror will be 0 if successful, a system error code otherwise. | |
21 | */ | |
22 | ||
23 | #include <stdio.h> | |
24 | #include "../libI77/f_errno.h" | |
25 | #include "../libI77/fiodefs.h" | |
26 | ||
27 | extern unit units[]; | |
28 | ||
29 | long fseek_(lu, off, from) | |
30 | long *lu, *off, *from; | |
31 | { | |
abb67f25 DW |
32 | if (*lu < 0 || *lu >= MXUNIT) |
33 | return((long)(errno=F_ERUNIT)); | |
34 | if (*from < 0 || *from > 2) | |
d030ca6c DW |
35 | return((long)(errno=F_ERARG)); |
36 | if (!units[*lu].ufd) | |
37 | return((long)(errno=F_ERNOPEN)); | |
38 | if (fseek(units[*lu].ufd, *off, (int)*from) < 0) | |
39 | return((long)errno); | |
40 | return(0L); | |
41 | } |