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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* fstree_sort.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "fstree.h"
#include "internal.h"
#include "test.h"
int main(void)
{
tree_node_t *a, *b, *c, *d;
struct stat sb;
fstree_t fs;
memset(&fs, 0, sizeof(fs));
memset(&sb, 0, sizeof(sb));
sb.st_mode = S_IFBLK | 0600;
sb.st_rdev = 1337;
a = fstree_mknode(NULL, "a", 1, NULL, &sb);
b = fstree_mknode(NULL, "b", 1, NULL, &sb);
c = fstree_mknode(NULL, "c", 1, NULL, &sb);
d = fstree_mknode(NULL, "d", 1, NULL, &sb);
TEST_ASSERT(a != NULL && b != NULL && c != NULL && d != NULL);
/* empty list */
TEST_NULL(tree_node_list_sort(NULL));
/* single element */
TEST_ASSERT(tree_node_list_sort(a) == a);
TEST_NULL(a->next);
/* two elements, reverse order */
b->next = a;
TEST_ASSERT(tree_node_list_sort(b) == a);
TEST_ASSERT(a->next == b);
TEST_NULL(b->next);
/* two elements, sorted order */
TEST_ASSERT(tree_node_list_sort(a) == a);
TEST_ASSERT(a->next == b);
TEST_NULL(b->next);
/* three elements, reverse order */
c->next = b;
b->next = a;
a->next = NULL;
TEST_ASSERT(tree_node_list_sort(c) == a);
TEST_ASSERT(a->next == b);
TEST_ASSERT(b->next == c);
TEST_NULL(c->next);
/* three elements, ordered */
TEST_ASSERT(tree_node_list_sort(a) == a);
TEST_ASSERT(a->next == b);
TEST_ASSERT(b->next == c);
TEST_NULL(c->next);
/* four elements, reverse order */
d->next = c;
c->next = b;
b->next = a;
a->next = NULL;
TEST_ASSERT(tree_node_list_sort(d) == a);
TEST_ASSERT(a->next == b);
TEST_ASSERT(b->next == c);
TEST_ASSERT(c->next == d);
TEST_NULL(d->next);
/* four elements, sorted order */
TEST_ASSERT(tree_node_list_sort(a) == a);
TEST_ASSERT(a->next == b);
TEST_ASSERT(b->next == c);
TEST_ASSERT(c->next == d);
TEST_NULL(d->next);
/* force merge sort to go through LRLR pattern */
b->next = a;
a->next = d;
d->next = c;
c->next = NULL;
TEST_ASSERT(tree_node_list_sort(b) == a);
TEST_ASSERT(a->next == b);
TEST_ASSERT(b->next == c);
TEST_ASSERT(c->next == d);
TEST_NULL(d->next);
/* cleanup and done */
free(a);
free(b);
free(c);
free(d);
return EXIT_SUCCESS;
}
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