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 are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)opendir.c 5.5 (Berkeley) 07/10/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <sys/param.h> 23 #include <dirent.h> 24 25 char *malloc(); 26 27 /* 28 * open a directory. 29 */ 30 DIR * 31 opendir(name) 32 char *name; 33 { 34 register DIR *dirp; 35 register int fd; 36 register int i; 37 38 if ((fd = open(name, 0)) == -1) 39 return NULL; 40 if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) { 41 close (fd); 42 return NULL; 43 } 44 /* 45 * If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE 46 * buffer that it cluster boundary aligned. 47 * Hopefully this can be a big win someday by allowing page trades 48 * to user space to be done by getdirentries() 49 */ 50 if ((CLSIZE % DIRBLKSIZ) == 0) { 51 dirp->dd_buf = malloc(CLSIZE); 52 dirp->dd_len = CLSIZE; 53 } else { 54 dirp->dd_buf = malloc(DIRBLKSIZ); 55 dirp->dd_len = DIRBLKSIZ; 56 } 57 if (dirp->dd_buf == NULL) { 58 close (fd); 59 return NULL; 60 } 61 dirp->dd_fd = fd; 62 dirp->dd_loc = 0; 63 dirp->dd_seek = 0; 64 dirp->dd_loccnt = 1; 65 for (i = 0; i < NDIRHASH; i++) 66 dirp->dd_hash[i] = NULL; 67 return dirp; 68 } 69