121358Sdist /* 221358Sdist * Copyright (c) 1983 Regents of the University of California. 334790Sbostic * All rights reserved. 434790Sbostic * 534790Sbostic * Redistribution and use in source and binary forms are permitted 634790Sbostic * provided that the above copyright notice and this paragraph are 734790Sbostic * duplicated in all such forms and that any documentation, 834790Sbostic * advertising materials, and other materials related to such 934790Sbostic * distribution and use acknowledge that the software was developed 1034790Sbostic * by the University of California, Berkeley. The name of the 1134790Sbostic * University may not be used to endorse or promote products derived 1234790Sbostic * from this software without specific prior written permission. 1334790Sbostic * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 1434790Sbostic * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 1534790Sbostic * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 1621358Sdist */ 1721358Sdist 1826583Sdonn #if defined(LIBC_SCCS) && !defined(lint) 19*36545Smckusick static char sccsid[] = "@(#)seekdir.c 5.4 (Berkeley) 01/11/89"; 2034790Sbostic #endif /* LIBC_SCCS and not lint */ 215752Smckusick 226370Smckusic #include <sys/param.h> 23*36545Smckusick #include <dirent.h> 245752Smckusick 255752Smckusick /* 265928Smckusic * seek to an entry in a directory. 2711636Smckusick * Only values returned by "telldir" should be passed to seekdir. 285752Smckusick */ 295752Smckusick void 305928Smckusic seekdir(dirp, loc) 315928Smckusic register DIR *dirp; 325928Smckusic long loc; 335752Smckusick { 345947Smckusic long curloc, base, offset; 35*36545Smckusick struct dirent *dp; 3611718Smckusick extern long lseek(); 375947Smckusic 385947Smckusic curloc = telldir(dirp); 395947Smckusic if (loc == curloc) 405947Smckusic return; 415947Smckusic base = loc & ~(DIRBLKSIZ - 1); 425947Smckusic offset = loc & (DIRBLKSIZ - 1); 4311718Smckusick (void) lseek(dirp->dd_fd, base, 0); 445947Smckusic dirp->dd_loc = 0; 455947Smckusic while (dirp->dd_loc < offset) { 465947Smckusic dp = readdir(dirp); 475947Smckusic if (dp == NULL) 485947Smckusic return; 495947Smckusic } 505752Smckusick } 51