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/***********************************************************************
* *
* 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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