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#include "splist.h"
#include "list.h"
#include <stdio.h>
struct splist_s {
List *ls; /* a list */
List *inv; /* and its inverse */
NUM len; /* how many elements are stored */
};
splist *
new_splist()
{
splist *result = MYALLOC(splist, 1);
if (result == NULL) return NULL;
result->ls = new_list();
if (result->ls == NULL) {
free(result);
return NULL;
}
result->inv = new_list();
if (result->inv == NULL) {
destroy_list(result->ls, 0);
free(result);
return NULL;
}
result->len = 0;
return result;
}
unsigned char
init_splist(splist *s, NUM size)
{
unsigned char result = 0;
result = list_assure_size(s->ls, size);
if (result) return result;
result = list_set_length(s->ls, size);
if (result) return result;
result = list_assure_size(s->inv, size);
if (result) return result;
result = list_set_length(s->inv, size);
return result;
}
P_ATTR
NUM
splist_len(CCR_MOD(splist *)s)
{
return s->len;
}
P_ATTR
List *
splist_ls(CCR_MOD(splist *) s)
{
return s->ls;
}
H_ATTR
void
reset_splist(splist *s)
{
s->len = 0;
}
H_ATTR
unsigned char
add_to_splist(splist *s, NUM element)
{
if (s->len >= list_length(s->ls)) {
fleprintf0("The length of the sparse list exceeds its size!\n");
print_splist(s);
return 1;
}
NUM *index_pointer = list_nth(s->ls, s->len);
*index_pointer = element;
NUM *element_pointer = list_nth(s->inv, element);
*element_pointer = s->len;
s->len += 1;
return 0;
}
H_ATTR
unsigned char
splist_is_member(splist *s, NUM element)
{
NUM *index = list_nth(s->inv, element);
if (*index < 0 || *index >= s->len)
return 0;
NUM *element_pointer = list_nth(s->ls, *index);
return *element_pointer == element;
}
void
print_splist(splist *s)
{
printf("Printing a sparse list with size %lu:\n",
list_length(s->ls));
for (NUM i = 0; i < list_length(s->ls); i++) {
NUM *pointer = list_nth(s->ls, i);
printf("%ld, \t", *pointer);
pointer = list_nth(s->inv, i);
printf("%ld\n", *pointer);
}
printf("Printing terminated\n");
}
void
destroy_splist(splist *s)
{
destroy_list(s->ls, 2);
destroy_list(s->inv, 2);
free(s);
}
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