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/* EINA_GRAPH - EFL graph processing library
* Copyright (C) 2013 Jérémy Zurcher
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of the Software and its Copyright notices. In addition publicly
* documented acknowledgment must be given that this software has been used if no
* source code of this software is made available publicly. This includes
* acknowledgments in either Copyright notices, Manuals, Publicity and Marketing
* documents or any documentation provided with any product containing this
* software. This License does not apply to any software that links to the
* libraries provided by this software (statically or dynamically), but only to
* the software provided.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <eina_graph.h>
#include "eina_graph_private.h"
EAPI Eina_Graph *
eina_graph_new(unsigned int v, unsigned int step, Eina_Bool directed)
{
unsigned int i;
_Eina_Graph *_g;
_g = calloc(1, sizeof(_Eina_Graph) + (v * sizeof(Eina_Array *)));
if (!_g)
{
ERR("calloc failed : %s", strerror(errno));
return NULL;
}
_g->vertices = v;
_g->directed = directed;
for (i = 0; i < v; i++)
_g->adjs[i] = eina_array_new(step);
return (Eina_Graph *) _g;
}
EAPI void
eina_graph_free(Eina_Graph *g)
{
unsigned int i;
_Eina_Graph * _g = (_Eina_Graph *) g;
for (i = 0; i< _g->vertices; i++)
eina_array_free(_g->adjs[i]);
free(_g);
}
EAPI Eina_Bool
eina_graph_directed(const Eina_Graph *g)
{
_Eina_Graph * _g = (_Eina_Graph *) g;
return _g->directed;
}
EAPI unsigned int
eina_graph_vertices_count(const Eina_Graph *g)
{
_Eina_Graph * _g = (_Eina_Graph *) g;
return _g->vertices;
}
EAPI unsigned int
eina_graph_edges_count(const Eina_Graph *g)
{
_Eina_Graph * _g = (_Eina_Graph *) g;
return _g->edges;
}
EAPI unsigned int
eina_graph_degree(const Eina_Graph *g, unsigned int v)
{
_Eina_Graph * _g = (_Eina_Graph *) g;
if (v >= _g->vertices)
{
ERR("%u is out of [0;%u[", v, _g->vertices);
return 0;
}
return eina_array_count_get(_g->adjs[v]);
}
EAPI unsigned int
eina_graph_degree_max(const Eina_Graph *g)
{
unsigned int i, n, max;
_Eina_Graph * _g = (_Eina_Graph *) g;
max = 0;
for (i = 0; i< _g->vertices; i++)
{
n = eina_array_count_get(_g->adjs[i]);
if ( n > max ) max = n;
}
return max;
}
EAPI float
eina_graph_degree_avg(const Eina_Graph *g)
{
_Eina_Graph * _g = (_Eina_Graph *) g;
return (2.0 * _g->edges) / _g->vertices;
}
EAPI unsigned int
eina_graph_self_loops(const Eina_Graph *g)
{
unsigned int i, j, n, loops;
Eina_Array *ar;
_Eina_Graph * _g = (_Eina_Graph *) g;
loops = 0;
for (i = 0; i< _g->vertices; i++)
{
ar = _g->adjs[i];
n = eina_array_count_get(ar);
for (j = 0; j < n; j++)
{
if(i == eina_array_uint_nth_get(ar, j)) loops++;
}
}
return loops;
}
EAPI Eina_Bool
eina_graph_edge_add(Eina_Graph *g, unsigned int v, unsigned int w)
{
_Eina_Graph * _g = (_Eina_Graph *) g;
if ((v >= _g->vertices) || (w >= _g->vertices))
{
ERR("%u->%u is out of [0;%u[", v, w, _g->vertices);
return EINA_FALSE;
}
if (!eina_array_push_uint(_g->adjs[v], w)) return EINA_FALSE;
if (!_g->directed && (v != w))
if (!eina_array_push_uint(_g->adjs[w], v)) return EINA_FALSE;
_g->edges++;
return EINA_TRUE;
}
EAPI void
eina_graph_dot_write(Eina_Graph *g, FILE *f)
{
int r;
char buf[32];
unsigned int i, j, n;
Eina_Array *ar;
_Eina_Graph * _g = (_Eina_Graph *) g;
if (_g->directed)
fwrite("digraph {\n", 10, 1, f);
else
fwrite("strict graph {\n", 15, 1, f);
for (i = 0; i< _g->vertices; i++)
{
ar = _g->adjs[i];
n = eina_array_count_get(ar);
for (j = 0; j < n; j++)
{
if (_g->directed)
r = snprintf(buf, 32, "%u -> %u;\n", i, eina_array_uint_nth_get(ar, j));
else
r = snprintf(buf, 32, "%u -- %u;\n", i, eina_array_uint_nth_get(ar, j));
fwrite(buf, r, 1, f);
}
}
fwrite("}\n", 2, 1, f);
}
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