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