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opendir.c
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C/C++ Source or Header
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1994-04-15
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3KB
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90 lines
/*
* 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: 14 April 1994
*
* Copyright 1994 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made available
* "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* Emulator for BSD opendir() call
* Accepts: directory name
* Returns: directory structure pointer
*/
DIR *opendir (name)
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 (d)
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 (d)
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 */
}