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/**
* @file
* Public interface for computing semantic differences in attributes.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2006-2007 Tresys Technology, LLC
*
* This 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef POLDIFF_ATTRIB_DIFF_H
#define POLDIFF_ATTRIB_DIFF_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <apol/vector.h>
#include <poldiff/poldiff.h>
typedef struct poldiff_attrib poldiff_attrib_t;
/**
* Get an array of statistics for the number of differences of each
* form for attributes.
*
* @param diff The policy difference structure from which to get the
* stats.
* @param stats Array into which to write the numbers (array must be
* pre-allocated). The order of the values written to the array is
* as follows: number of items of form POLDIFF_FORM_ADDED, number of
* POLDIFF_FORM_REMOVED, number of POLDIFF_FORM_MODIFIED, number of
* POLDIFF_FORM_ADD_TYPE, and number of POLDIFF_FORM_REMOVE_TYPE.
*/
extern void poldiff_attrib_get_stats(const poldiff_t * diff, size_t stats[5]);
/**
* Get the vector of attribute differences from the attribute
* difference summary.
*
* @param diff The policy difference structure associated with the
* attribute difference summary.
*
* @return A vector of elements of type poldiff_attrib_t, or NULL on
* error. The caller should <b>not</b> destroy the vector
* returned. If the call fails, errno will be set.
*/
extern const apol_vector_t *poldiff_get_attrib_vector(const poldiff_t * diff);
/**
* Obtain a newly allocated string representation of a difference in
* a attribute.
*
* @param diff The policy difference structure associated with the
* attribute.
* @param attrib The attribute from which to generate the string.
*
* @return A string representation of attribute difference; the
* caller is responsible for free()ing this string. On error, return
* NULL and set errno.
*/
extern char *poldiff_attrib_to_string(const poldiff_t * diff, const void *attrib);
/**
* Get the name of the attribute from an attribute diff.
*
* @param attrib The attribute from which to get the name.
*
* @return Name of the attribute on success and NULL on failure; if
* the call fails, errno will be set. The caller should not free the
* returned string.
*/
extern const char *poldiff_attrib_get_name(const poldiff_attrib_t * attrib);
/**
* Get the form of difference from an attribute diff.
*
* @param attrib The attribute from which to get the difference form.
*
* @return The form of difference (one of POLDIFF_FORM_*) or
* POLDIFF_FORM_NONE on error. If the call fails, errno will be set.
*/
extern poldiff_form_e poldiff_attrib_get_form(const void *attrib);
/**
* Get a vector of types added to the attribute.
*
* @param attrib The attribute diff from which to get the types
* vector.
*
* @return A vector of type names (type char *) that are members of
* the attribute in the modified policy. If no types were added the
* size of the returned vector will be 0. The caller must not
* destroy this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_attrib_get_added_types(const poldiff_attrib_t * attrib);
/**
* Get a vector of types removed from the attribute.
*
* @param attrib The attribute diff from which to get the types
* vector.
*
* @return A vector of type names (type char *) that are members of
* the attribute in the original policy. If no types were removed
* the size of the returned vector will be 0. The caller must not
* destroy this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_attrib_get_removed_types(const poldiff_attrib_t * attrib);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_ATTRIB_DIFF_H */
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