1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 09/29/94"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/param.h> 13 #include <dirent.h> 14 15 /* 16 * get next entry in a directory. 17 */ 18 struct dirent * 19 readdir(dirp) 20 register DIR *dirp; 21 { 22 register struct dirent *dp; 23 24 for (;;) { 25 if (dirp->dd_loc >= dirp->dd_size) { 26 if (dirp->dd_flags & __DTF_READALL) 27 return (NULL); 28 dirp->dd_loc = 0; 29 } 30 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) { 31 dirp->dd_size = getdirentries(dirp->dd_fd, 32 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 33 if (dirp->dd_size <= 0) 34 return (NULL); 35 } 36 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 37 if ((int)dp & 03) /* bogus pointer check */ 38 return (NULL); 39 if (dp->d_reclen <= 0 || 40 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 41 return (NULL); 42 dirp->dd_loc += dp->d_reclen; 43 if (dp->d_ino == 0) 44 continue; 45 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW)) 46 continue; 47 return (dp); 48 } 49 } 50