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1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
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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. | |
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16 | */ |
17 | ||
2ce81398 | 18 | #if defined(LIBC_SCCS) && !defined(lint) |
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19 | static char sccsid[] = "@(#)readdir.c 5.4 (Berkeley) %G%"; |
20 | #endif /* LIBC_SCCS and not lint */ | |
f20e5624 | 21 | |
c4a04593 | 22 | #include <sys/param.h> |
455b164d | 23 | #include <sys/dir.h> |
6a2babc1 | 24 | |
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25 | /* |
26 | * get next entry in a directory. | |
27 | */ | |
28 | struct direct * | |
29 | readdir(dirp) | |
30 | register DIR *dirp; | |
31 | { | |
c9f0b4d5 | 32 | register struct direct *dp; |
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33 | |
34 | for (;;) { | |
35 | if (dirp->dd_loc == 0) { | |
7d09c938 | 36 | dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, |
4dad72b6 | 37 | DIRBLKSIZ); |
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38 | if (dirp->dd_size <= 0) |
39 | return NULL; | |
40 | } | |
41 | if (dirp->dd_loc >= dirp->dd_size) { | |
42 | dirp->dd_loc = 0; | |
43 | continue; | |
44 | } | |
c9f0b4d5 | 45 | dp = (struct direct *)(dirp->dd_buf + dirp->dd_loc); |
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46 | if ((int)dp & 03) /* bogus pointer check */ |
47 | return NULL; | |
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48 | if (dp->d_reclen <= 0 || |
49 | dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc) | |
50 | return NULL; | |
51 | dirp->dd_loc += dp->d_reclen; | |
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52 | if (dp->d_ino == 0) |
53 | continue; | |
c9f0b4d5 | 54 | return (dp); |
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55 | } |
56 | } |