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Annotation of 43BSD/lib/libc/gen/seekdir.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #if defined(LIBC_SCCS) && !defined(lint)
        !             8: static char sccsid[] = "@(#)seekdir.c  5.2 (Berkeley) 3/9/86";
        !             9: #endif LIBC_SCCS and not lint
        !            10: 
        !            11: #include <sys/param.h>
        !            12: #include <sys/dir.h>
        !            13: 
        !            14: /*
        !            15:  * seek to an entry in a directory.
        !            16:  * Only values returned by "telldir" should be passed to seekdir.
        !            17:  */
        !            18: void
        !            19: seekdir(dirp, loc)
        !            20:        register DIR *dirp;
        !            21:        long loc;
        !            22: {
        !            23:        long curloc, base, offset;
        !            24:        struct direct *dp;
        !            25:        extern long lseek();
        !            26: 
        !            27:        curloc = telldir(dirp);
        !            28:        if (loc == curloc)
        !            29:                return;
        !            30:        base = loc & ~(DIRBLKSIZ - 1);
        !            31:        offset = loc & (DIRBLKSIZ - 1);
        !            32:        (void) lseek(dirp->dd_fd, base, 0);
        !            33:        dirp->dd_loc = 0;
        !            34:        while (dirp->dd_loc < offset) {
        !            35:                dp = readdir(dirp);
        !            36:                if (dp == NULL)
        !            37:                        return;
        !            38:        }
        !            39: }

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