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Annotation of researchv9/libc/gen/seekdir.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1982 Regents of the University of California */
        !             2: 
        !             3: static char sccsid[] = "@(#)seekdir.c 4.3 2/25/82";
        !             4: 
        !             5: #include <sys/types.h>
        !             6: #include <ndir.h>
        !             7: 
        !             8: /*
        !             9:  * seek to an entry in a directory.
        !            10:  * Only values returned by ``telldir'' should be passed to seekdir.
        !            11:  */
        !            12: void
        !            13: seekdir(dirp, loc)
        !            14:        register DIR *dirp;
        !            15:        long loc;
        !            16: {
        !            17:        long curloc, base, offset;
        !            18:        struct direct *dp;
        !            19: 
        !            20:        curloc = telldir(dirp);
        !            21:        if (loc == curloc)
        !            22:                return;
        !            23:        base = loc & ~(DIRBLKSIZ - 1);
        !            24:        offset = loc & (DIRBLKSIZ - 1);
        !            25:        if (dirp->dd_loc != 0 && (curloc & ~(DIRBLKSIZ - 1)) == base) {
        !            26:                dirp->dd_loc = offset;
        !            27:                return;
        !            28:        }
        !            29:        lseek(dirp->dd_fd, base, 0);
        !            30:        dirp->dd_loc = 0;
        !            31:        while (dirp->dd_loc < offset) {
        !            32:                dp = readdir(dirp);
        !            33:                if (dp == NULL)
        !            34:                        return;
        !            35:        }
        !            36: }

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