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/*
* ausearch-int.c - Minimal linked list library for integers
* Copyright (c) 2005,2008 Red Hat Inc., Durham, North Carolina.
* All Rights Reserved.
*
* This software may be freely redistributed and/or modified under the
* terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Authors:
* Steve Grubb <sgrubb@redhat.com>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "ausearch-int.h"
void ilist_create(ilist *l)
{
l->head = NULL;
l->cur = NULL;
l->cnt = 0;
}
int_node *ilist_next(ilist *l)
{
if (l->cur == NULL)
return NULL;
l->cur = l->cur->next;
return l->cur;
}
void ilist_append(ilist *l, int num, unsigned int hits, int aux)
{
int_node* newnode;
newnode = malloc(sizeof(int_node));
newnode->num = num;
newnode->hits = hits;
newnode->aux1 = aux;
newnode->next = NULL;
// if we are at top, fix this up
if (l->head == NULL)
l->head = newnode;
else // Otherwise add pointer to newnode
l->cur->next = newnode;
// make newnode current
l->cur = newnode;
l->cnt++;
}
void ilist_clear(ilist* l)
{
int_node* nextnode;
register int_node* current;
if (l == NULL)
return;
current = l->head;
while (current) {
nextnode=current->next;
free(current);
current=nextnode;
}
l->head = NULL;
l->cur = NULL;
l->cnt = 0;
}
int ilist_add_if_uniq(ilist *l, int num, int aux)
{
register int_node *cur, *prev;
prev = cur = l->head;
while (cur) {
if (cur->num == num) {
cur->hits++;
return 0;
} else if (num > cur->num) {
prev = cur;
cur = cur->next;
} else {
int head = 0;
// Insert so list is from low to high
if (cur == l->head) {
l->head = NULL;
head = 1;
} else
l->cur = prev;
ilist_append(l, num, 1, aux);
if (head)
l->cur->next = prev;
else
l->cur->next = cur;
return 1;
}
}
if (prev)
l->cur = prev;
/* No matches, append to the end */
ilist_append(l, num, 1, aux);
return 1;
}
// If lprev would be NULL, use l->head
static void swap_nodes(int_node *lprev, int_node *left, int_node *right)
{
int_node *t = right->next;
if (lprev)
lprev->next = right;
right->next = left;
left->next = t;
}
// This will sort the list from most hits to least
void ilist_sort_by_hits(ilist *l)
{
register int_node* cur, *prev;
if (l->cnt <= 1)
return;
prev = cur = l->head;
while (cur && cur->next) {
/* If the next node is bigger */
if (cur->hits < cur->next->hits) {
if (cur == l->head) {
// Update the actual list head
l->head = cur->next;
prev = NULL;
}
swap_nodes(prev, cur, cur->next);
// start over
prev = cur = l->head;
continue;
}
prev = cur;
cur = cur->next;
}
// End with cur pointing at first record
l->cur = l->head;
}
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