forked from Imagelibrary/rtems
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*
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* rtems_filesystem_evaluate_path()
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*
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* Routine to seed the evaluate path routine.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems.h>
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#include <rtems/libio_.h>
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#include <rtems/seterr.h>
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int rtems_filesystem_evaluate_path(
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const char *pathname,
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int flags,
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rtems_filesystem_location_info_t *pathloc,
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int follow_link
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)
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{
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int i;
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int result;
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rtems_filesystem_node_types_t type;
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/*
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* Verify Input parameters.
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*/
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if ( !pathname )
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rtems_set_errno_and_return_minus_one( EFAULT );
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if ( !pathloc )
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rtems_set_errno_and_return_minus_one( EIO ); /* should never happen */
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/*
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* Evaluate the path using the optable evalpath.
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*/
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rtems_filesystem_get_start_loc( pathname, &i, pathloc );
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if ( !pathloc->ops->evalpath_h )
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rtems_set_errno_and_return_minus_one( ENOTSUP );
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result = (*pathloc->ops->evalpath_h)( &pathname[i], flags, pathloc );
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/*
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* Get the Node type and determine if you need to follow the link or
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* not.
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*/
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if ( (result == 0) && follow_link ) {
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if ( !pathloc->ops->node_type_h ){
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rtems_filesystem_freenode( pathloc );
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rtems_set_errno_and_return_minus_one( ENOTSUP );
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}
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type = (*pathloc->ops->node_type_h)( pathloc );
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if ( ( type == RTEMS_FILESYSTEM_HARD_LINK ) ||
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( type == RTEMS_FILESYSTEM_SYM_LINK ) ) {
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if ( !pathloc->ops->eval_link_h ){
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rtems_filesystem_freenode( pathloc );
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rtems_set_errno_and_return_minus_one( ENOTSUP );
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}
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/* what to do with the valid node pathloc points to
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* if eval_link_h fails?
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* Let the FS implementation deal with this case. It
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* should probably free pathloc in either case:
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* - if the link evaluation fails, it must free the
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* original (valid) pathloc because we are going
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* to return -1 and hence the FS generics won't
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* cleanup pathloc.
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* - if the link evaluation is successful, the updated
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* pathloc will be passed up (and eventually released).
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* Hence, the (valid) originial node that we submit to
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* eval_link_h() should be released by the handler.
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*/
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result = (*pathloc->ops->eval_link_h)( pathloc, flags );
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}
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}
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return result;
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}
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int rtems_filesystem_evaluate_parent(
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int flags,
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rtems_filesystem_location_info_t *pathloc
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)
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{
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rtems_filesystem_location_info_t parent;
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int result;
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if ( !pathloc )
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rtems_set_errno_and_return_minus_one( EIO ); /* should never happen */
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if ( !pathloc->ops->evalpath_h )
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rtems_set_errno_and_return_minus_one( ENOTSUP );
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parent = *pathloc;
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result = (*pathloc->ops->evalpath_h)( "..", flags, &parent );
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if (result != 0){
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return -1;
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}
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rtems_filesystem_freenode( &parent );
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return result;
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}
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