toolchain/gcc/newlib/libc/sys/sparc64/opendir.c

   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 <dirent.h>
  39 #include <fcntl.h>
  40 #include <stdlib.h>
  41 #include <unistd.h>
  42
  43 /*
  44  * open a directory.
  45  */
  46 DIR *
  47 opendir(name)
  48         const char *name;
  49 {
  50         register DIR *dirp;
  51         register int fd;
  52
  53         if ((fd = open(name, 0)) == -1)
  54                 return NULL;
  55         if (fcntl(fd, F_SETFD, 1) == -1 ||
  56             (dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
  57                 close (fd);
  58                 return NULL;
  59         }
  60         /*
  61          * If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE
  62          * buffer that it cluster boundary aligned.
  63          * Hopefully this can be a big win someday by allowing page trades
  64          * to user space to be done by getdirentries()
  65          */
  66         dirp->dd_buf = malloc (512);
  67         dirp->dd_len = 512;
  68
  69         if (dirp->dd_buf == NULL) {
  70                 close (fd);
  71                 return NULL;
  72         }
  73         dirp->dd_fd = fd;
  74         dirp->dd_loc = 0;
  75         dirp->dd_seek = 0;
  76         /*
  77          * Set up seek point for rewinddir.
  78          */
  79         return dirp;
  80 }