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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Read directories
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 16 December 1993
* Last Edited: 30 August 2006
*/
/* Emulator for BSD opendir() call
* Accepts: directory name
* Returns: directory structure pointer
*/
DIR *opendir (char *name)
{
DIR *d = NIL;
struct stat sbuf;
int fd = open (name,O_RDONLY,NIL);
errno = ENOTDIR; /* default error is bogus directory */
if ((fd >= 0) && !(fstat (fd,&sbuf)) && ((sbuf.st_mode&S_IFMT) == S_IFDIR)) {
d = (DIR *) fs_get (sizeof (DIR));
/* initialize structure */
d->dd_loc = 0;
read (fd,d->dd_buf = (char *) fs_get (sbuf.st_size),
d->dd_size = sbuf.st_size);
}
else if (d) fs_give ((void **) &d);
if (fd >= 0) close (fd);
return d;
}
/* Emulator for BSD closedir() call
* Accepts: directory structure pointer
*/
int closedir (DIR *d)
{
/* free storage */
fs_give ((void **) &(d->dd_buf));
fs_give ((void **) &d);
return NIL; /* return */
}
/* Emulator for BSD readdir() call
* Accepts: directory structure pointer
*/
struct direct *readdir (DIR *d)
{
/* loop through directory */
while (d->dd_loc < d->dd_size) {
struct direct *dp = (struct direct *) (d->dd_buf + d->dd_loc);
d->dd_loc += sizeof (struct direct);
if (dp->d_ino) return dp; /* if have a good entry return it */
}
return NIL; /* all done */
}
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