1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 24 /* 25 * seekdir 26 * 27 * seek on directory stream 28 * this is not optimal because there aren't portable 29 * semantics for directory seeks 30 */ 31 32 #include "dirlib.h" 33 34 #if _dir_ok 35 36 NoN(seekdir) 37 38 #else 39 40 void 41 seekdir(register DIR* dirp, long loc) 42 { 43 off_t base; /* file location of block */ 44 off_t offset; /* offset within block */ 45 46 if (telldir(dirp) != loc) 47 { 48 lseek(dirp->dd_fd, 0L, SEEK_SET); 49 dirp->dd_loc = dirp->dd_size = 0; 50 while (telldir(dirp) != loc) 51 if (!readdir(dirp)) 52 break; /* "can't happen" */ 53 } 54 } 55 56 #endif 57