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

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.