Return to seekdir.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / lib / libc / gen

Annotation of 43BSDTahoe/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)seekdir.c  5.3 (Berkeley) 6/18/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <sys/param.h>
        !            23: #include <sys/dir.h>
        !            24: 
        !            25: /*
        !            26:  * seek to an entry in a directory.
        !            27:  * Only values returned by "telldir" should be passed to seekdir.
        !            28:  */
        !            29: void
        !            30: seekdir(dirp, loc)
        !            31:        register DIR *dirp;
        !            32:        long loc;
        !            33: {
        !            34:        long curloc, base, offset;
        !            35:        struct direct *dp;
        !            36:        extern long lseek();
        !            37: 
        !            38:        curloc = telldir(dirp);
        !            39:        if (loc == curloc)
        !            40:                return;
        !            41:        base = loc & ~(DIRBLKSIZ - 1);
        !            42:        offset = loc & (DIRBLKSIZ - 1);
        !            43:        (void) lseek(dirp->dd_fd, base, 0);
        !            44:        dirp->dd_loc = 0;
        !            45:        while (dirp->dd_loc < offset) {
        !            46:                dp = readdir(dirp);
        !            47:                if (dp == NULL)
        !            48:                        return;
        !            49:        }
        !            50: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.