1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)readdir.c 5.7 (Berkeley) 06/01/90"; 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 == 0) { 26 dirp->dd_size = getdirentries(dirp->dd_fd, 27 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 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 } 35 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 36 if ((int)dp & 03) /* bogus pointer check */ 37 return NULL; 38 if (dp->d_reclen <= 0 || 39 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 40 return NULL; 41 dirp->dd_loc += dp->d_reclen; 42 if (dp->d_ino == 0) 43 continue; 44 return (dp); 45 } 46 } 47