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/* libdiskfs implementation of fs.defs: file_get_translator
Copyright (C) 1992, 1993, 1994 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include <hurd/paths.h>
#include <string.h>
#include "fs_S.h"
/* Implement file_get_translator as described in <hurd/fs.defs>. */
kern_return_t
diskfs_S_file_get_translator (struct protid *cred,
char **trans,
u_int *translen)
{
struct node *np;
error_t error;
if (!cred)
return EOPNOTSUPP;
np = cred->po->np;
mutex_lock (&np->lock);
/* First look for short-circuited translators. */
if (S_ISLNK (np->dn_stat.st_mode))
{
int len = sizeof _HURD_SYMLINK + np->dn_stat.st_size + 1;
int amt;
assert (diskfs_shortcut_symlink);
if (len > *translen)
vm_allocate (mach_task_self (), (vm_address_t *)trans, len, 1);
bcopy (_HURD_SYMLINK, *trans, sizeof _HURD_SYMLINK);
if (diskfs_read_symlink_hook)
error = (*diskfs_read_symlink_hook) (np,
*trans + sizeof _HURD_SYMLINK);
if (!diskfs_read_symlink_hook || error == EINVAL)
{
error = diskfs_node_rdwr (np, *trans + sizeof _HURD_SYMLINK,
0, np->dn_stat.st_size, 0, cred, &amt);
if (!error)
assert (amt == np->dn_stat.st_size);
}
if (!error)
{
(*trans)[sizeof _HURD_SYMLINK + np->dn_stat.st_size] = '\0';
*translen = len;
}
}
else if (S_ISCHR (np->dn_stat.st_mode) || S_ISBLK (np->dn_stat.st_mode))
{
char *buf;
int buflen;
if (S_ISCHR (np->dn_stat.st_mode))
assert (diskfs_shortcut_chrdev);
else
assert (diskfs_shortcut_blkdev);
buflen = asprintf (&buf, "%s%c%d%c%d",
(S_ISCHR (np->dn_stat.st_mode)
? _HURD_CHRDEV
: _HURD_BLKDEV),
'\0', (np->dn_stat.st_rdev >> 8) & 0377,
'\0', (np->dn_stat.st_rdev) & 0377);
buflen++; /* terminating nul */
if (buflen > *translen)
vm_allocate (mach_task_self (), (vm_address_t *) trans, buflen, 1);
bcopy (buf, *trans, buflen);
*translen = buflen;
error = 0;
}
else if (S_ISFIFO (np->dn_stat.st_mode))
{
int len;
len = sizeof _HURD_FIFO;
if (len > *translen)
vm_allocate (mach_task_self (), (vm_address_t *) trans, len, 1);
bcopy (_HURD_FIFO, *trans, sizeof _HURD_FIFO);
*translen = len;
error = 0;
}
else if (S_ISSOCK (np->dn_stat.st_mode))
{
int len;
len = sizeof _HURD_IFSOCK;
if (len > *translen)
vm_allocate (mach_task_self (), (vm_address_t *) trans, len, 1);
bcopy (_HURD_IFSOCK, *trans, sizeof _HURD_IFSOCK);
*translen = len;
error = 0;
}
else
{
if (!np->istranslated)
error = EINVAL;
else
error = diskfs_get_translator (np, trans, translen);
}
mutex_unlock (&np->lock);
return error;
}
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