121355Sdist /* 221355Sdist * Copyright (c) 1983 Regents of the University of California. 334790Sbostic * All rights reserved. 434790Sbostic * 534790Sbostic * Redistribution and use in source and binary forms are permitted 634790Sbostic * provided that the above copyright notice and this paragraph are 734790Sbostic * duplicated in all such forms and that any documentation, 834790Sbostic * advertising materials, and other materials related to such 934790Sbostic * distribution and use acknowledge that the software was developed 1034790Sbostic * by the University of California, Berkeley. The name of the 1134790Sbostic * University may not be used to endorse or promote products derived 1234790Sbostic * from this software without specific prior written permission. 1334790Sbostic * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 1434790Sbostic * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 1534790Sbostic * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 1621355Sdist */ 1721355Sdist 1826579Sdonn #if defined(LIBC_SCCS) && !defined(lint) 19*36545Smckusick static char sccsid[] = "@(#)readdir.c 5.5 (Berkeley) 01/11/89"; 2034790Sbostic #endif /* LIBC_SCCS and not lint */ 215751Smckusick 226370Smckusic #include <sys/param.h> 23*36545Smckusick #include <dirent.h> 245751Smckusick 255751Smckusick /* 265751Smckusick * get next entry in a directory. 275751Smckusick */ 28*36545Smckusick struct dirent * 295751Smckusick readdir(dirp) 305751Smckusick register DIR *dirp; 315751Smckusick { 32*36545Smckusick register struct dirent *dp; 335751Smckusick 345751Smckusick for (;;) { 355751Smckusick if (dirp->dd_loc == 0) { 365756Smckusic dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, 375872Smckusic DIRBLKSIZ); 385751Smckusick if (dirp->dd_size <= 0) 395751Smckusick return NULL; 405751Smckusick } 415751Smckusick if (dirp->dd_loc >= dirp->dd_size) { 425751Smckusick dirp->dd_loc = 0; 435751Smckusick continue; 445751Smckusick } 45*36545Smckusick dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 4634756Sbostic if ((int)dp & 03) /* bogus pointer check */ 4734756Sbostic return NULL; 486712Smckusick if (dp->d_reclen <= 0 || 496712Smckusick dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc) 506712Smckusick return NULL; 516712Smckusick dirp->dd_loc += dp->d_reclen; 525766Smckusic if (dp->d_ino == 0) 535766Smckusic continue; 546712Smckusick return (dp); 555751Smckusick } 565751Smckusick } 57