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1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
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3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
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16 | */ |
17 | ||
2ce81398 | 18 | #if defined(LIBC_SCCS) && !defined(lint) |
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19 | static char sccsid[] = "@(#)seekdir.c 5.3 (Berkeley) %G%"; |
20 | #endif /* LIBC_SCCS and not lint */ | |
07063983 | 21 | |
c4a04593 | 22 | #include <sys/param.h> |
455b164d | 23 | #include <sys/dir.h> |
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24 | |
25 | /* | |
67d6a82e | 26 | * seek to an entry in a directory. |
8b57b083 | 27 | * Only values returned by "telldir" should be passed to seekdir. |
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28 | */ |
29 | void | |
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30 | seekdir(dirp, loc) |
31 | register DIR *dirp; | |
32 | long loc; | |
07063983 | 33 | { |
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34 | long curloc, base, offset; |
35 | struct direct *dp; | |
17b5e9d0 | 36 | extern long lseek(); |
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37 | |
38 | curloc = telldir(dirp); | |
39 | if (loc == curloc) | |
40 | return; | |
41 | base = loc & ~(DIRBLKSIZ - 1); | |
42 | offset = loc & (DIRBLKSIZ - 1); | |
17b5e9d0 | 43 | (void) lseek(dirp->dd_fd, base, 0); |
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44 | dirp->dd_loc = 0; |
45 | while (dirp->dd_loc < offset) { | |
46 | dp = readdir(dirp); | |
47 | if (dp == NULL) | |
48 | return; | |
49 | } | |
07063983 | 50 | } |