xref: /titanic_50/usr/src/lib/libast/common/dir/readdir.c (revision 275c9da86e89f8abf71135cf63d9fc23671b2e60)
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  * readdir
25  *
26  * read from directory stream
27  *
28  * NOTE: directory entries must fit within DIRBLKSIZ boundaries
29  */
30 
31 #include "dirlib.h"
32 
33 #if _dir_ok
34 
35 NoN(readdir)
36 
37 #else
38 
39 struct dirent*
40 readdir(register DIR* dirp)
41 {
42 	register struct dirent*	dp;
43 
44 	for (;;)
45 	{
46 		if (dirp->dd_loc >= dirp->dd_size)
47 		{
48 			if (dirp->dd_size < 0) return(0);
49 			dirp->dd_loc = 0;
50 			if ((dirp->dd_size = getdents(dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
51 				return(0);
52 		}
53 		dp = (struct dirent*)((char*)dirp->dd_buf + dirp->dd_loc);
54 		if (dp->d_reclen <= 0) return(0);
55 		dirp->dd_loc += dp->d_reclen;
56 		if (dp->d_fileno) return(dp);
57 	}
58 	/*NOTREACHED*/
59 }
60 
61 #endif
62