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282 lines
7.7 KiB
C
282 lines
7.7 KiB
C
/* Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <hurd.h>
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#include <hurd/lookup.h>
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#include <string.h>
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#include <fcntl.h>
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/* Translate the error from dir_lookup into the error the user sees. */
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static inline error_t
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lookup_error (error_t error)
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{
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switch (error)
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{
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case EOPNOTSUPP:
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case MIG_BAD_ID:
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/* These indicate that the server does not understand dir_lookup
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at all. If it were a directory, it would, by definition. */
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return ENOTDIR;
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default:
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return error;
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}
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}
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error_t
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__hurd_file_name_lookup (error_t (*use_init_port)
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(int which, error_t (*operate) (file_t)),
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file_t (*get_dtable_port) (int fd),
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error_t (*lookup)
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(file_t dir, char *name, int flags, mode_t mode,
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retry_type *do_retry, string_t retry_name,
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mach_port_t *result),
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const char *file_name, int flags, mode_t mode,
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file_t *result)
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{
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error_t err;
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enum retry_type doretry;
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char retryname[1024]; /* XXX string_t LOSES! */
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int startport;
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error_t lookup_op (mach_port_t startdir)
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{
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return lookup_error ((*lookup) (startdir, file_name, flags, mode,
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&doretry, retryname, result));
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}
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if (! lookup)
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lookup = __dir_lookup;
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if (file_name[0] == '\0')
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return ENOENT;
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startport = (file_name[0] == '/') ? INIT_PORT_CRDIR : INIT_PORT_CWDIR;
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while (file_name[0] == '/')
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file_name++;
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if (flags & O_NOFOLLOW) /* See lookup-retry.c about O_NOFOLLOW. */
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flags |= O_NOTRANS;
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if (flags & O_DIRECTORY)
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{
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/* The caller wants to require that the file we look up is a directory.
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We can do this without an extra RPC by appending a trailing slash
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to the file name we look up. */
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size_t len = strlen (file_name);
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if (len == 0)
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file_name = "/";
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else if (file_name[len - 1] != '/')
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{
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char *n = alloca (len + 2);
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memcpy (n, file_name, len);
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n[len] = '/';
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n[len + 1] = '\0';
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file_name = n;
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}
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}
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err = (*use_init_port) (startport, &lookup_op);
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if (! err)
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err = __hurd_file_name_lookup_retry (use_init_port, get_dtable_port,
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lookup, doretry, retryname,
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flags, mode, result);
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return err;
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}
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weak_alias (__hurd_file_name_lookup, hurd_file_name_lookup)
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error_t
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__hurd_file_name_split (error_t (*use_init_port)
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(int which, error_t (*operate) (file_t)),
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file_t (*get_dtable_port) (int fd),
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error_t (*lookup)
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(file_t dir, char *name, int flags, mode_t mode,
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retry_type *do_retry, string_t retry_name,
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mach_port_t *result),
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const char *file_name,
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file_t *dir, char **name)
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{
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error_t addref (file_t crdir)
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{
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*dir = crdir;
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return __mach_port_mod_refs (__mach_task_self (),
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crdir, MACH_PORT_RIGHT_SEND, +1);
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}
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const char *lastslash = strrchr (file_name, '/');
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if (lastslash != NULL)
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{
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if (lastslash == file_name)
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{
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/* "/foobar" => crdir + "foobar". */
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*name = (char *) file_name + 1;
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return (*use_init_port) (INIT_PORT_CRDIR, &addref);
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}
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else
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{
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/* "/dir1/dir2/.../file". */
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char dirname[lastslash - file_name + 1];
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memcpy (dirname, file_name, lastslash - file_name);
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dirname[lastslash - file_name] = '\0';
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*name = (char *) lastslash + 1;
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return
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__hurd_file_name_lookup (use_init_port, get_dtable_port, lookup,
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dirname, 0, 0, dir);
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}
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}
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else if (file_name[0] == '\0')
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return ENOENT;
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else
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{
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/* "foobar" => cwdir + "foobar". */
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*name = (char *) file_name;
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return (*use_init_port) (INIT_PORT_CWDIR, &addref);
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}
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}
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weak_alias (__hurd_file_name_split, hurd_file_name_split)
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/* This is the same as hurd_file_name_split, except that it ignores
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trailing slashes (so *NAME is never ""). */
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error_t
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__hurd_directory_name_split (error_t (*use_init_port)
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(int which, error_t (*operate) (file_t)),
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file_t (*get_dtable_port) (int fd),
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error_t (*lookup)
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(file_t dir, char *name, int flags, mode_t mode,
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retry_type *do_retry, string_t retry_name,
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mach_port_t *result),
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const char *file_name,
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file_t *dir, char **name)
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{
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error_t addref (file_t crdir)
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{
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*dir = crdir;
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return __mach_port_mod_refs (__mach_task_self (),
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crdir, MACH_PORT_RIGHT_SEND, +1);
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}
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const char *lastslash = strrchr (file_name, '/');
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if (lastslash != NULL && lastslash[1] == '\0')
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{
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/* Trailing slash doesn't count. Look back further. */
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/* Back up over all trailing slashes. */
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while (lastslash > file_name && *lastslash == '/')
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--lastslash;
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/* Find the last one earlier in the string, before the trailing ones. */
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lastslash = __memrchr (file_name, '/', lastslash - file_name);
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}
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if (lastslash != NULL)
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{
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if (lastslash == file_name)
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{
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/* "/foobar" => crdir + "foobar". */
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*name = (char *) file_name + 1;
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return (*use_init_port) (INIT_PORT_CRDIR, &addref);
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}
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else
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{
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/* "/dir1/dir2/.../file". */
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char dirname[lastslash - file_name + 1];
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memcpy (dirname, file_name, lastslash - file_name);
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dirname[lastslash - file_name] = '\0';
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*name = (char *) lastslash + 1;
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return
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__hurd_file_name_lookup (use_init_port, get_dtable_port, lookup,
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dirname, 0, 0, dir);
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}
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}
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else if (file_name[0] == '\0')
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return ENOENT;
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else
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{
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/* "foobar" => cwdir + "foobar". */
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*name = (char *) file_name;
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return (*use_init_port) (INIT_PORT_CWDIR, &addref);
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}
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}
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weak_alias (__hurd_directory_name_split, hurd_directory_name_split)
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file_t
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__file_name_lookup (const char *file_name, int flags, mode_t mode)
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{
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error_t err;
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file_t result;
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err = __hurd_file_name_lookup (&_hurd_ports_use, &__getdport, 0,
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file_name, flags, mode & ~_hurd_umask,
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&result);
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return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
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}
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weak_alias (__file_name_lookup, file_name_lookup)
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file_t
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__file_name_split (const char *file_name, char **name)
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{
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error_t err;
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file_t result;
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err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
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file_name, &result, name);
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return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
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}
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weak_alias (__file_name_split, file_name_split)
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file_t
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__directory_name_split (const char *directory_name, char **name)
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{
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error_t err;
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file_t result;
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err = __hurd_directory_name_split (&_hurd_ports_use, &__getdport, 0,
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directory_name, &result, name);
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return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
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}
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weak_alias (__directory_name_split, directory_name_split)
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file_t
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__file_name_lookup_under (file_t startdir,
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const char *file_name, int flags, mode_t mode)
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{
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error_t err;
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file_t result;
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error_t use_init_port (int which, error_t (*operate) (mach_port_t))
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{
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return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
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_hurd_ports_use (which, operate));
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}
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err = __hurd_file_name_lookup (&use_init_port, &__getdport, 0,
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file_name, flags, mode & ~_hurd_umask,
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&result);
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return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
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}
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weak_alias (__file_name_lookup_under, file_name_lookup_under)
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