1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)opendir.c 5.11 (Berkeley) 2/23/91"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/param.h> 39 #include <dirent.h> 40 #include <fcntl.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 long _rewinddir; 45 46 /* 47 * open a directory. 48 */ 49 DIR * 50 opendir(name) 51 const char *name; 52 { 53 register DIR *dirp; 54 register int fd; 55 56 if ((fd = open(name, 0)) == -1) 57 return NULL; 58 if (fcntl(fd, F_SETFD, 1) == -1 || 59 (dirp = (DIR *)malloc(sizeof(DIR))) == NULL) { 60 close (fd); 61 return NULL; 62 } 63 /* 64 * If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE 65 * buffer that it cluster boundary aligned. 66 * Hopefully this can be a big win someday by allowing page trades 67 * to user space to be done by getdirentries() 68 */ 69 if ((CLSIZE % DIRBLKSIZ) == 0) { 70 dirp->dd_buf = malloc(CLSIZE); 71 dirp->dd_len = CLSIZE; 72 } else { 73 dirp->dd_buf = malloc(DIRBLKSIZ); 74 dirp->dd_len = DIRBLKSIZ; 75 } 76 if (dirp->dd_buf == NULL) { 77 close (fd); 78 return NULL; 79 } 80 dirp->dd_fd = fd; 81 dirp->dd_loc = 0; 82 dirp->dd_seek = 0; 83 /* 84 * Set up seek point for rewinddir. 85 */ 86 _rewinddir = telldir(dirp); 87 return dirp; 88 } 89