291 lines
7.9 KiB
C
291 lines
7.9 KiB
C
/* Copyright (C) 1992,93,94,95,96,97,99,2001 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
|
||
The GNU C Library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Lesser General Public
|
||
License as published by the Free Software Foundation; either
|
||
version 2.1 of the License, or (at your option) any later version.
|
||
|
||
The GNU C Library 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
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with the GNU C Library; if not, write to the Free
|
||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
02111-1307 USA. */
|
||
|
||
#include <hurd.h>
|
||
#include <hurd/lookup.h>
|
||
#include <string.h>
|
||
#include <fcntl.h>
|
||
|
||
|
||
/* Translate the error from dir_lookup into the error the user sees. */
|
||
static inline error_t
|
||
lookup_error (error_t error)
|
||
{
|
||
switch (error)
|
||
{
|
||
case EOPNOTSUPP:
|
||
case MIG_BAD_ID:
|
||
/* These indicate that the server does not understand dir_lookup
|
||
at all. If it were a directory, it would, by definition. */
|
||
return ENOTDIR;
|
||
default:
|
||
return error;
|
||
}
|
||
}
|
||
|
||
error_t
|
||
__hurd_file_name_lookup (error_t (*use_init_port)
|
||
(int which, error_t (*operate) (file_t)),
|
||
file_t (*get_dtable_port) (int fd),
|
||
error_t (*lookup)
|
||
(file_t dir, char *name, int flags, mode_t mode,
|
||
retry_type *do_retry, string_t retry_name,
|
||
mach_port_t *result),
|
||
const char *file_name, int flags, mode_t mode,
|
||
file_t *result)
|
||
{
|
||
error_t err;
|
||
enum retry_type doretry;
|
||
char retryname[1024]; /* XXX string_t LOSES! */
|
||
int startport;
|
||
|
||
error_t lookup_op (mach_port_t startdir)
|
||
{
|
||
return lookup_error ((*lookup) (startdir, file_name, flags, mode,
|
||
&doretry, retryname, result));
|
||
}
|
||
|
||
if (! lookup)
|
||
lookup = __dir_lookup;
|
||
|
||
if (file_name[0] == '\0')
|
||
return ENOENT;
|
||
|
||
startport = (file_name[0] == '/') ? INIT_PORT_CRDIR : INIT_PORT_CWDIR;
|
||
while (file_name[0] == '/')
|
||
file_name++;
|
||
|
||
if (flags & O_NOFOLLOW) /* See lookup-retry.c about O_NOFOLLOW. */
|
||
flags |= O_NOTRANS;
|
||
|
||
if (flags & O_DIRECTORY)
|
||
{
|
||
/* The caller wants to require that the file we look up is a directory.
|
||
We can do this without an extra RPC by appending a trailing slash
|
||
to the file name we look up. */
|
||
size_t len = strlen (file_name);
|
||
if (len == 0)
|
||
file_name = "/";
|
||
else if (file_name[len - 1] != '/')
|
||
{
|
||
char *n = alloca (len + 2);
|
||
memcpy (n, file_name, len);
|
||
n[len] = '/';
|
||
n[len + 1] = '\0';
|
||
file_name = n;
|
||
}
|
||
}
|
||
|
||
err = (*use_init_port) (startport, &lookup_op);
|
||
if (! err)
|
||
err = __hurd_file_name_lookup_retry (use_init_port, get_dtable_port,
|
||
lookup, doretry, retryname,
|
||
flags, mode, result);
|
||
|
||
return err;
|
||
}
|
||
weak_alias (__hurd_file_name_lookup, hurd_file_name_lookup)
|
||
|
||
error_t
|
||
__hurd_file_name_split (error_t (*use_init_port)
|
||
(int which, error_t (*operate) (file_t)),
|
||
file_t (*get_dtable_port) (int fd),
|
||
error_t (*lookup)
|
||
(file_t dir, char *name, int flags, mode_t mode,
|
||
retry_type *do_retry, string_t retry_name,
|
||
mach_port_t *result),
|
||
const char *file_name,
|
||
file_t *dir, char **name)
|
||
{
|
||
error_t addref (file_t crdir)
|
||
{
|
||
*dir = crdir;
|
||
return __mach_port_mod_refs (__mach_task_self (),
|
||
crdir, MACH_PORT_RIGHT_SEND, +1);
|
||
}
|
||
|
||
const char *lastslash = strrchr (file_name, '/');
|
||
|
||
if (lastslash != NULL)
|
||
{
|
||
if (lastslash == file_name)
|
||
{
|
||
/* "/foobar" => crdir + "foobar". */
|
||
*name = (char *) file_name + 1;
|
||
return (*use_init_port) (INIT_PORT_CRDIR, &addref);
|
||
}
|
||
else
|
||
{
|
||
/* "/dir1/dir2/.../file". */
|
||
char dirname[lastslash - file_name + 1];
|
||
memcpy (dirname, file_name, lastslash - file_name);
|
||
dirname[lastslash - file_name] = '\0';
|
||
*name = (char *) lastslash + 1;
|
||
return
|
||
__hurd_file_name_lookup (use_init_port, get_dtable_port, lookup,
|
||
dirname, 0, 0, dir);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* "foobar" => cwdir + "foobar". */
|
||
*name = (char *) file_name;
|
||
return (*use_init_port) (INIT_PORT_CWDIR, &addref);
|
||
}
|
||
}
|
||
weak_alias (__hurd_file_name_split, hurd_file_name_split)
|
||
|
||
/* This is the same as hurd_file_name_split, except that it ignores
|
||
trailing slashes (so *NAME is never ""). */
|
||
error_t
|
||
__hurd_directory_name_split (error_t (*use_init_port)
|
||
(int which, error_t (*operate) (file_t)),
|
||
file_t (*get_dtable_port) (int fd),
|
||
error_t (*lookup)
|
||
(file_t dir, char *name, int flags, mode_t mode,
|
||
retry_type *do_retry, string_t retry_name,
|
||
mach_port_t *result),
|
||
const char *file_name,
|
||
file_t *dir, char **name)
|
||
{
|
||
error_t addref (file_t crdir)
|
||
{
|
||
*dir = crdir;
|
||
return __mach_port_mod_refs (__mach_task_self (),
|
||
crdir, MACH_PORT_RIGHT_SEND, +1);
|
||
}
|
||
|
||
const char *lastslash = strrchr (file_name, '/');
|
||
|
||
if (lastslash != NULL && lastslash[1] == '\0')
|
||
{
|
||
/* Trailing slash doesn't count. Look back further. */
|
||
|
||
/* Back up over all trailing slashes. */
|
||
while (lastslash > file_name && *lastslash == '/')
|
||
--lastslash;
|
||
|
||
/* Find the last one earlier in the string, before the trailing ones. */
|
||
#if __GLIBC__ > 2 || __GLIBC_MINOR__ >= 2
|
||
lastslash = __memrchr (file_name, '/', lastslash - file_name);
|
||
#else
|
||
/* Keep backing up, looking for a slash. */
|
||
do
|
||
if (lastslash == file_name)
|
||
{
|
||
/* Hit the start with no slash. */
|
||
lastslash = NULL;
|
||
break;
|
||
}
|
||
while (*lastslash-- != '/');
|
||
#endif
|
||
}
|
||
|
||
if (lastslash != NULL)
|
||
{
|
||
if (lastslash == file_name)
|
||
{
|
||
/* "/foobar" => crdir + "foobar". */
|
||
*name = (char *) file_name + 1;
|
||
return (*use_init_port) (INIT_PORT_CRDIR, &addref);
|
||
}
|
||
else
|
||
{
|
||
/* "/dir1/dir2/.../file". */
|
||
char dirname[lastslash - file_name + 1];
|
||
memcpy (dirname, file_name, lastslash - file_name);
|
||
dirname[lastslash - file_name] = '\0';
|
||
*name = (char *) lastslash + 1;
|
||
return
|
||
__hurd_file_name_lookup (use_init_port, get_dtable_port, lookup,
|
||
dirname, 0, 0, dir);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* "foobar" => cwdir + "foobar". */
|
||
*name = (char *) file_name;
|
||
return (*use_init_port) (INIT_PORT_CWDIR, &addref);
|
||
}
|
||
}
|
||
weak_alias (__hurd_directory_name_split, hurd_directory_name_split)
|
||
|
||
|
||
file_t
|
||
__file_name_lookup (const char *file_name, int flags, mode_t mode)
|
||
{
|
||
error_t err;
|
||
file_t result;
|
||
|
||
err = __hurd_file_name_lookup (&_hurd_ports_use, &__getdport, 0,
|
||
file_name, flags, mode & ~_hurd_umask,
|
||
&result);
|
||
|
||
return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
|
||
}
|
||
weak_alias (__file_name_lookup, file_name_lookup)
|
||
|
||
|
||
file_t
|
||
__file_name_split (const char *file_name, char **name)
|
||
{
|
||
error_t err;
|
||
file_t result;
|
||
|
||
err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
|
||
file_name, &result, name);
|
||
|
||
return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
|
||
}
|
||
weak_alias (__file_name_split, file_name_split)
|
||
|
||
file_t
|
||
__directory_name_split (const char *directory_name, char **name)
|
||
{
|
||
error_t err;
|
||
file_t result;
|
||
|
||
err = __hurd_directory_name_split (&_hurd_ports_use, &__getdport, 0,
|
||
directory_name, &result, name);
|
||
|
||
return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
|
||
}
|
||
weak_alias (__directory_name_split, directory_name_split)
|
||
|
||
|
||
file_t
|
||
__file_name_lookup_under (file_t startdir,
|
||
const char *file_name, int flags, mode_t mode)
|
||
{
|
||
error_t err;
|
||
file_t result;
|
||
|
||
error_t use_init_port (int which, error_t (*operate) (mach_port_t))
|
||
{
|
||
return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
|
||
_hurd_ports_use (which, operate));
|
||
}
|
||
|
||
err = __hurd_file_name_lookup (&use_init_port, &__getdport, 0,
|
||
file_name, flags, mode & ~_hurd_umask,
|
||
&result);
|
||
|
||
return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
|
||
}
|
||
weak_alias (__file_name_lookup_under, file_name_lookup_under)
|