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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vppinfra/graph.h>
/* Set link distance, creating link if not found. */
u32
graph_set_link (graph_t * g, u32 src, u32 dst, u32 distance)
{
graph_node_t *src_node, *dst_node;
graph_link_t *l;
u32 old_distance;
/* The following validate will not work if src or dst are on the
pool free list. */
if (src < vec_len (g->nodes))
ASSERT (!pool_is_free_index (g->nodes, src));
if (dst < vec_len (g->nodes))
ASSERT (!pool_is_free_index (g->nodes, dst));
/* Make new (empty) nodes to make src and dst valid. */
pool_validate_index (g->nodes, clib_max (src, dst));
src_node = pool_elt_at_index (g->nodes, src);
dst_node = pool_elt_at_index (g->nodes, dst);
l = graph_dir_get_link_to_node (&src_node->next, dst);
if (l)
{
old_distance = l->distance;
l->distance = distance;
l = graph_dir_get_link_to_node (&dst_node->prev, src);
l->distance = distance;
}
else
{
uword li_next, li_prev;
old_distance = ~0;
li_next = graph_dir_add_link (&src_node->next, dst, distance);
li_prev = graph_dir_add_link (&dst_node->prev, src, distance);
l = vec_elt_at_index (src_node->next.links, li_next);
l->link_to_self_index = li_prev;
l = vec_elt_at_index (dst_node->prev.links, li_prev);
l->link_to_self_index = li_next;
}
return old_distance;
}
void
graph_del_link (graph_t * g, u32 src, u32 dst)
{
graph_node_t *src_node, *dst_node;
src_node = pool_elt_at_index (g->nodes, src);
dst_node = pool_elt_at_index (g->nodes, dst);
graph_dir_del_link (&src_node->next, dst);
graph_dir_del_link (&dst_node->next, src);
}
/* Delete source node and all links from other nodes from/to source. */
uword
graph_del_node (graph_t * g, u32 src)
{
graph_node_t *src_node, *n;
uword index;
graph_link_t *l;
src_node = pool_elt_at_index (g->nodes, src);
vec_foreach (l, src_node->next.links)
{
n = pool_elt_at_index (g->nodes, l->node_index);
graph_dir_del_link (&n->prev, src);
}
vec_foreach (l, src_node->prev.links)
{
n = pool_elt_at_index (g->nodes, l->node_index);
graph_dir_del_link (&n->next, src);
}
graph_dir_free (&src_node->next);
graph_dir_free (&src_node->prev);
index = src_node - g->nodes;
pool_put (g->nodes, src_node);
clib_memset (src_node, ~0, sizeof (src_node[0]));
return index;
}
uword
unformat_graph (unformat_input_t * input, va_list * args)
{
graph_t *g = va_arg (*args, graph_t *);
typedef struct
{
u32 src, dst, distance;
} T;
T *links = 0, *l;
uword result;
while (1)
{
vec_add2 (links, l, 1);
if (!unformat (input, "%d%d%d", &l->src, &l->dst, &l->distance))
break;
}
_vec_len (links) -= 1;
result = vec_len (links) > 0;
vec_foreach (l, links)
{
graph_set_link (g, l->src, l->dst, l->distance);
graph_set_link (g, l->dst, l->src, l->distance);
}
vec_free (links);
return result;
}
u8 *
format_graph_node (u8 * s, va_list * args)
{
graph_t *g = va_arg (*args, graph_t *);
u32 node_index = va_arg (*args, u32);
if (g->format_node)
s = format (s, "%U", g->format_node, g, node_index);
else
s = format (s, "%d", node_index);
return s;
}
u8 *
format_graph (u8 * s, va_list * args)
{
graph_t *g = va_arg (*args, graph_t *);
graph_node_t *n;
graph_link_t *l;
u32 indent = format_get_indent (s);
s = format (s, "graph %d nodes", pool_elts (g->nodes));
/* *INDENT-OFF* */
pool_foreach (n, g->nodes) {
s = format (s, "\n%U", format_white_space, indent + 2);
s = format (s, "%U -> ", format_graph_node, g, n - g->nodes);
vec_foreach (l, n->next.links)
s = format (s, "%U (%d), ",
format_graph_node, g, l->node_index,
l->distance);
}
/* *INDENT-ON* */
return s;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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