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/*
* Copyright (c) 2012 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Obere Lagerstr. 30
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/libio_.h>
static bool is_fs_root( const rtems_filesystem_location_info_t *loc )
{
const rtems_filesystem_location_info_t *mt_fs_root =
&loc->mt_entry->mt_fs_root->location;
return (*loc->ops->are_nodes_equal_h)( loc, mt_fs_root );
}
static bool is_eval_path_root(
const rtems_filesystem_eval_path_context_t *ctx,
const rtems_filesystem_location_info_t *loc
)
{
const rtems_filesystem_location_info_t *rootloc = &ctx->rootloc->location;
return loc->mt_entry == rootloc->mt_entry
&& (*loc->ops->are_nodes_equal_h)( loc, rootloc );
}
void rtems_filesystem_eval_path_generic(
rtems_filesystem_eval_path_context_t *ctx,
void *arg,
const rtems_filesystem_eval_path_generic_config *config
)
{
rtems_filesystem_eval_path_generic_status status =
RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE;
while (status == RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE) {
const char *token;
size_t tokenlen;
rtems_filesystem_eval_path_get_next_token(ctx, &token, &tokenlen);
if (tokenlen > 0) {
if ((*config->is_directory)(ctx, arg)) {
if (rtems_filesystem_is_current_directory(token, tokenlen)) {
if (rtems_filesystem_eval_path_has_path(ctx)) {
status = (*config->eval_token)(ctx, arg, ".", 1);
} else {
int eval_flags = rtems_filesystem_eval_path_get_flags(ctx);
if ((eval_flags & RTEMS_LIBIO_REJECT_TERMINAL_DOT) == 0) {
status = (*config->eval_token)(ctx, arg, ".", 1);
} else {
rtems_filesystem_eval_path_error(ctx, EINVAL);
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
}
}
} else if (rtems_filesystem_is_parent_directory(token, tokenlen)) {
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc( ctx );
if (is_eval_path_root(ctx, currentloc)) {
/* This prevents the escape from a chroot() environment */
status = (*config->eval_token)(ctx, arg, ".", 1);
} else if (is_fs_root(currentloc)) {
if (currentloc->mt_entry->mt_point_node != NULL) {
rtems_filesystem_eval_path_put_back_token(ctx);
rtems_filesystem_eval_path_restart(
ctx,
¤tloc->mt_entry->mt_point_node
);
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
} else {
/* This is the root file system */
status = (*config->eval_token)(ctx, arg, ".", 1);
}
} else {
status = (*config->eval_token)(ctx, arg, "..", 2);
}
} else {
status = (*config->eval_token)(ctx, arg, token, tokenlen);
}
if (status == RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY) {
if (rtems_filesystem_eval_path_has_path(ctx)) {
int eval_flags;
rtems_filesystem_eval_path_eat_delimiter(ctx);
eval_flags = rtems_filesystem_eval_path_get_flags(ctx);
if (
(eval_flags & RTEMS_LIBIO_ACCEPT_RESIDUAL_DELIMITERS) == 0
|| rtems_filesystem_eval_path_has_path(ctx)
) {
rtems_filesystem_eval_path_error(ctx, ENOENT);
}
}
}
} else {
rtems_filesystem_eval_path_error(ctx, ENOTDIR);
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
}
} else {
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
}
}
}
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