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opendir.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * opendir, closedir
 *
 * open|close directory stream
 *
 * POSIX compatible directory stream access routines:
 *
 *    #include <sys/types.h>
 *    #include <dirent.h>
 *
 * NOTE: readdir() returns a pointer to struct dirent
 */

#include "dirlib.h"

#if _dir_ok

NoN(opendir)

#else

static const char id_dir[] = "\n@(#)$Id: directory (AT&T Research) 1993-04-01 $\0\n";

static DIR* freedirp;         /* always keep one dirp */

DIR*
opendir(register const char* path)
{
      register DIR*     dirp = 0;
      register int      fd;
      struct stat st;

      if ((fd = open(path, O_RDONLY)) < 0) return(0);
      if (fstat(fd, &st) < 0 ||
         !S_ISDIR(st.st_mode) && (errno = ENOTDIR) ||
         fcntl(fd, F_SETFD, FD_CLOEXEC) ||
         !(dirp = freedirp ? freedirp :
#if defined(_DIR_PRIVATE_) || _ptr_dd_buf
         newof(0, DIR, 1, DIRBLKSIZ)
#else
         newof(0, DIR, 1, 0)
#endif
            ))
      {
            close(fd);
            if (dirp)
            {
                  if (!freedirp) freedirp = dirp;
                  else free(dirp);
            }
            return(0);
      }
      freedirp = 0;
      dirp->dd_fd = fd;
      dirp->dd_loc = dirp->dd_size = 0;   /* refill needed */
#if defined(_DIR_PRIVATE_) || _ptr_dd_buf
      dirp->dd_buf = (void*)((char*)dirp + sizeof(DIR));
#endif
      return(dirp);
}

void
closedir(register DIR* dirp)
{
      if (dirp)
      {
            close(dirp->dd_fd);
            if (!freedirp) freedirp = dirp;
            else free(dirp);
      }
}

#endif

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