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Annotation of 43BSD/contrib/mh/miscellany/libndir/seekdir.c, revision 1.1.1.1

1.1       root        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: }

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