| rsc | daefa1a | 2005-01-18 18:11:39 +0000 | [diff] [blame] | 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <fcall.h> |
| 4 | #include <9pclient.h> |
| 5 | #include "fsimpl.h" |
| 6 | |
| 7 | vlong |
| 8 | fsseek(CFid *fid, vlong n, int whence) |
| 9 | { |
| 10 | Dir *d; |
| 11 | |
| 12 | switch(whence){ |
| 13 | case 0: |
| 14 | qlock(&fid->lk); |
| 15 | fid->offset = n; |
| 16 | qunlock(&fid->lk); |
| 17 | break; |
| 18 | case 1: |
| 19 | qlock(&fid->lk); |
| 20 | n += fid->offset; |
| 21 | if(n < 0){ |
| 22 | qunlock(&fid->lk); |
| 23 | werrstr("negative offset"); |
| 24 | return -1; |
| 25 | } |
| 26 | fid->offset = n; |
| 27 | qunlock(&fid->lk); |
| 28 | break; |
| 29 | case 2: |
| 30 | if((d = fsdirfstat(fid)) == nil) |
| 31 | return -1; |
| 32 | n += d->length; |
| 33 | if(n < 0){ |
| 34 | werrstr("negative offset"); |
| 35 | return -1; |
| 36 | } |
| 37 | qlock(&fid->lk); |
| 38 | fid->offset = n; |
| 39 | qunlock(&fid->lk); |
| 40 | break; |
| 41 | default: |
| 42 | werrstr("bad whence in fsseek"); |
| 43 | return -1; |
| 44 | } |
| 45 | return n; |
| 46 | } |
