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