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bb0cfa24 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
d99e6414 KB |
3 | * All rights reserved. |
4 | * | |
269a7923 | 5 | * %sccs.include.redist.c% |
bb0cfa24 DF |
6 | */ |
7 | ||
2ce81398 | 8 | #if defined(LIBC_SCCS) && !defined(lint) |
269a7923 | 9 | static char sccsid[] = "@(#)readdir.c 5.7 (Berkeley) %G%"; |
d99e6414 | 10 | #endif /* LIBC_SCCS and not lint */ |
f20e5624 | 11 | |
c4a04593 | 12 | #include <sys/param.h> |
8c6e64bc | 13 | #include <dirent.h> |
6a2babc1 | 14 | |
f20e5624 KM |
15 | /* |
16 | * get next entry in a directory. | |
17 | */ | |
8c6e64bc | 18 | struct dirent * |
f20e5624 KM |
19 | readdir(dirp) |
20 | register DIR *dirp; | |
21 | { | |
8c6e64bc | 22 | register struct dirent *dp; |
f20e5624 KM |
23 | |
24 | for (;;) { | |
25 | if (dirp->dd_loc == 0) { | |
d46abbe3 KM |
26 | dirp->dd_size = getdirentries(dirp->dd_fd, |
27 | dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); | |
f20e5624 KM |
28 | if (dirp->dd_size <= 0) |
29 | return NULL; | |
30 | } | |
31 | if (dirp->dd_loc >= dirp->dd_size) { | |
32 | dirp->dd_loc = 0; | |
33 | continue; | |
34 | } | |
8c6e64bc | 35 | dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); |
13cfd6f7 KB |
36 | if ((int)dp & 03) /* bogus pointer check */ |
37 | return NULL; | |
c9f0b4d5 | 38 | if (dp->d_reclen <= 0 || |
d46abbe3 | 39 | dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) |
c9f0b4d5 KM |
40 | return NULL; |
41 | dirp->dd_loc += dp->d_reclen; | |
d3d77310 KM |
42 | if (dp->d_ino == 0) |
43 | continue; | |
c9f0b4d5 | 44 | return (dp); |
f20e5624 KM |
45 | } |
46 | } |