forked from Imagelibrary/rtems
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
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* readlink() - POSIX 1003.1b - X.X.X - XXX
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*
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* COPYRIGHT (c) 1989-1998.
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* On-Line Applications Research Corporation (OAR).
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* Copyright assigned to U.S. Government, 1994.
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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.OARcorp.com/rtems/license.html.
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*
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* $Id$
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*/
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#include "libio_.h"
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int readlink(
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const char *pathname,
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char *buf,
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int bufsize
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)
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{
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rtems_filesystem_location_info_t loc;
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int result;
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if (!buf)
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set_errno_and_return_minus_one( EFAULT );
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result = rtems_filesystem_evaluate_path( pathname, 0, &loc, FALSE );
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if ( result != 0 )
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return -1;
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if ( !loc.ops->node_type ){
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if ( loc.ops->freenod )
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(*loc.ops->freenod)( &loc );
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set_errno_and_return_minus_one( ENOTSUP );
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}
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if ( (*loc.ops->node_type)( &loc ) != RTEMS_FILESYSTEM_SYM_LINK ){
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if ( loc.ops->freenod )
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(*loc.ops->freenod)( &loc );
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set_errno_and_return_minus_one( EINVAL );
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}
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if ( !loc.ops->readlink ){
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if ( loc.ops->freenod )
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(*loc.ops->freenod)( &loc );
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set_errno_and_return_minus_one( ENOTSUP );
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}
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result = (*loc.ops->readlink)( &loc, buf, bufsize );
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if ( loc.ops->freenod )
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(*loc.ops->freenod)( &loc );
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return result;
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}
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