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Annotation of 43BSDReno/lib/libc/gen/opendir.c, revision 1.1.1.1

1.1       root        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: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)opendir.c  5.10 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/param.h>
                     25: #include <dirent.h>
                     26: #include <fcntl.h>
                     27: 
                     28: char *malloc();
                     29: long _rewinddir;
                     30: 
                     31: /*
                     32:  * open a directory.
                     33:  */
                     34: DIR *
                     35: opendir(name)
                     36:        char *name;
                     37: {
                     38:        register DIR *dirp;
                     39:        register int fd;
                     40: 
                     41:        if ((fd = open(name, 0)) == -1)
                     42:                return NULL;
                     43:        if (fcntl(fd, F_SETFD, 1) == -1 ||
                     44:            (dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
                     45:                close (fd);
                     46:                return NULL;
                     47:        }
                     48:        /*
                     49:         * If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE
                     50:         * buffer that it cluster boundary aligned.
                     51:         * Hopefully this can be a big win someday by allowing page trades
                     52:         * to user space to be done by getdirentries()
                     53:         */
                     54:        if ((CLSIZE % DIRBLKSIZ) == 0) {
                     55:                dirp->dd_buf = malloc(CLSIZE);
                     56:                dirp->dd_len = CLSIZE;
                     57:        } else {
                     58:                dirp->dd_buf = malloc(DIRBLKSIZ);
                     59:                dirp->dd_len = DIRBLKSIZ;
                     60:        }
                     61:        if (dirp->dd_buf == NULL) {
                     62:                close (fd);
                     63:                return NULL;
                     64:        }
                     65:        dirp->dd_fd = fd;
                     66:        dirp->dd_loc = 0;
                     67:        dirp->dd_seek = 0;
                     68:        /*
                     69:         * Set up seek point for rewinddir.
                     70:         */
                     71:        _rewinddir = telldir(dirp);
                     72:        return dirp;
                     73: }

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