usr/src/lib/libast/common/dir/readdir.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * readdir
  25  *
  26  * read from directory stream
  27  *
  28  * NOTE: directory entries must fit within DIRBLKSIZ boundaries
  29  */
  30
  31 #include "dirlib.h"
  32
  33 #if _dir_ok
  34
  35 NoN(readdir)
  36
  37 #else
  38
  39 struct dirent*
  40 readdir(register DIR* dirp)
  41 {
  42         register struct dirent* dp;
  43
  44         for (;;)
  45         {
  46                 if (dirp->dd_loc >= dirp->dd_size)
  47                 {
  48                         if (dirp->dd_size < 0) return(0);
  49                         dirp->dd_loc = 0;
  50                         if ((dirp->dd_size = getdents(dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
  51                                 return(0);
  52                 }
  53                 dp = (struct dirent*)((char*)dirp->dd_buf + dirp->dd_loc);
  54                 if (dp->d_reclen <= 0) return(0);
  55                 dirp->dd_loc += dp->d_reclen;
  56                 if (dp->d_fileno) return(dp);
  57         }
  58         /*NOTREACHED*/
  59 }
  60
  61 #endif