changes for whiteouts and union filesystem

[unix-history] / usr / src / lib / libc / gen / readdir.c

/*
* Copyright (c) 1983, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)readdir.c   8.2 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <dirent.h>

/*
* get next entry in a directory.
*/
struct dirent *
readdir(dirp)
       register DIR *dirp;
{
       register struct dirent *dp;

       for (;;) {
               if (dirp->dd_loc >= dirp->dd_size) {
                       if (dirp->dd_flags & __DTF_READALL)
                               return (NULL);
                       dirp->dd_loc = 0;
               }
               if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
                       dirp->dd_size = getdirentries(dirp->dd_fd,
                           dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
                       if (dirp->dd_size <= 0)
                               return (NULL);
               }
               dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
               if ((int)dp & 03)       /* bogus pointer check */
                       return (NULL);
               if (dp->d_reclen <= 0 ||
                   dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
                       return (NULL);
               dirp->dd_loc += dp->d_reclen;
               if (dp->d_ino == 0)
                       continue;
               return (dp);
       }
}