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comparison miscellany/libndir/seekdir.c @ 0:bce86c4163a3

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Initial revision
author kono
date Mon, 18 Apr 2005 23:46:02 +0900
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-1:000000000000 0:bce86c4163a3
1 static char sccsid[] = "@(#)seekdir.c 4.9 3/25/83";
2
3 #include <sys/param.h>
4 #include <dir.h>
5
6 /*
7 * seek to an entry in a directory.
8 * Only values returned by "telldir" should be passed to seekdir.
9 */
10 void
11 seekdir(dirp, loc)
12 register DIR *dirp;
13 long loc;
14 {
15 long curloc, base, offset;
16 struct direct *dp;
17 extern long lseek();
18
19 curloc = telldir(dirp);
20 if (loc == curloc)
21 return;
22 base = loc & ~(DIRBLKSIZ - 1);
23 offset = loc & (DIRBLKSIZ - 1);
24 (void) lseek(dirp->dd_fd, base, 0);
25 dirp->dd_loc = 0;
26 while (dirp->dd_loc < offset) {
27 dp = readdir(dirp);
28 if (dp == NULL)
29 return;
30 }
31 }