Commit | Line | Data |
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d030ca6c DW |
1 | /* |
2 | char id_fseek[] = "@(#)fseek_.c 1.1"; | |
3 | * | |
4 | * position a file associated with a fortran logical unit | |
5 | * | |
6 | * calling sequence: | |
7 | * ierror = fseek(lunit, ioff, ifrom) | |
8 | * where: | |
9 | * lunit is an open logical unit | |
10 | * ioff is an offset in bytes relative to the position specified by ifrom | |
11 | * ifrom - 0 means 'beginning of the file' | |
12 | * - 1 means 'the current position' | |
13 | * - 2 means 'the end of the file' | |
14 | * ierror will be 0 if successful, a system error code otherwise. | |
15 | */ | |
16 | ||
17 | #include <stdio.h> | |
18 | #include "../libI77/f_errno.h" | |
19 | #include "../libI77/fiodefs.h" | |
20 | ||
21 | extern unit units[]; | |
22 | ||
23 | long fseek_(lu, off, from) | |
24 | long *lu, *off, *from; | |
25 | { | |
26 | if (*lu < 0 || *lu >= MXUNIT || *from < 0 || *from > 2) | |
27 | return((long)(errno=F_ERARG)); | |
28 | if (!units[*lu].ufd) | |
29 | return((long)(errno=F_ERNOPEN)); | |
30 | if (fseek(units[*lu].ufd, *off, (int)*from) < 0) | |
31 | return((long)errno); | |
32 | return(0L); | |
33 | } |