toolchain/gcc/newlib/libc/sys/sparc64/readdir.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[] = "@(#)readdir.c   5.7 (Berkeley) 6/1/90";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <dirent.h>
  39
  40 /*
  41  * get next entry in a directory.
  42  */
  43 struct dirent *
  44 readdir(dirp)
  45 register DIR *dirp; {
  46   register struct dirent *dp;
  47
  48   for (;;) {
  49     if (dirp->dd_loc == 0) {
  50       dirp->dd_size = getdents (dirp->dd_fd,
  51                                 dirp->dd_buf,
  52                                 dirp->dd_len);
  53
  54       if (dirp->dd_size <= 0)
  55         return NULL;
  56     }
  57     if (dirp->dd_loc >= dirp->dd_size) {
  58       dirp->dd_loc = 0;
  59       continue;
  60     }
  61     dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
  62     if ((int)dp & 03)   /* bogus pointer check */
  63       return NULL;
  64     if (dp->d_reclen <= 0 ||
  65         dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
  66       return NULL;
  67     dirp->dd_loc += dp->d_reclen;
  68     if (dp->d_ino == 0)
  69       continue;
  70     return (dp);
  71   }
  72 }