1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Eclipse Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.eclipse.org/org/documents/epl-v10.html * 11* (with md5 checksum b35adb5213ca9657e911e9befb180842) * 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 36NoN(seekdir) 37 38#else 39 40void 41seekdir(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