104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
#include "list_ops.h"
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#include <string.h>
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// constructs a new list
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list_t *new_list(size_t length, list_element_t elements[]) {
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list_t *list = (list_t *)malloc(sizeof(list_t) + length * sizeof(list_element_t));
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if (!list) {
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return NULL;
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}
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list->length = length;
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memcpy(list->elements, elements, length * sizeof(list_element_t));
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return list;
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}
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// append entries to a list and return the new list
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list_t *append_list(list_t *list1, list_t *list2) {
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size_t new_length = list1->length + list2->length;
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list_t *new_list = (list_t *)malloc(sizeof(list_t) + new_length * sizeof(list_element_t));
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if (!new_list) {
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return NULL;
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}
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new_list->length = new_length;
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memcpy(new_list->elements, list1->elements, list1->length * sizeof(list_element_t));
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memcpy(new_list->elements + list1->length, list2->elements, list2->length * sizeof(list_element_t));
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return new_list;
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}
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// filter list returning only values that satisfy the filter function
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list_t *filter_list(list_t *list, bool (*filter)(list_element_t)) {
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list_element_t *temp = (list_element_t *)malloc(list->length * sizeof(list_element_t));
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if (!temp) {
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return NULL;
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}
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size_t count = 0;
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for (size_t i = 0; i < list->length; i++) {
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if (filter(list->elements[i])) {
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temp[count++] = list->elements[i];
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}
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}
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list_t *filtered_list = (list_t *)malloc(sizeof(list_t) + count * sizeof(list_element_t));
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if (!filtered_list) {
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free(temp);
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return NULL;
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}
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filtered_list->length = count;
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memcpy(filtered_list->elements, temp, count * sizeof(list_element_t));
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free(temp);
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return filtered_list;
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}
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// returns the length of the list
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size_t length_list(list_t *list) {
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return list->length;
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}
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// return a list of elements whose values equal the list value transformed by the mapping function
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list_t *map_list(list_t *list, list_element_t (*map)(list_element_t)) {
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list_t *mapped_list = (list_t *)malloc(sizeof(list_t) + list->length * sizeof(list_element_t));
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if (!mapped_list) {
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return NULL;
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}
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mapped_list->length = list->length;
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for (size_t i = 0; i < list->length; i++) {
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mapped_list->elements[i] = map(list->elements[i]);
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}
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return mapped_list;
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}
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// folds (reduces) the given list from the left with a function
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list_element_t foldl_list(list_t *list, list_element_t initial, list_element_t (*foldl)(list_element_t, list_element_t)) {
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list_element_t result = initial;
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for (size_t i = 0; i < list->length; i++) {
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result = foldl(result, list->elements[i]);
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}
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return result;
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}
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// folds (reduces) the given list from the right with a function
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list_element_t foldr_list(list_t *list, list_element_t initial, list_element_t (*foldr)(list_element_t, list_element_t)) {
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list_element_t result = initial;
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for (size_t i = list->length; i > 0; i--) {
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result = foldr(list->elements[i - 1], result);
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}
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return result;
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}
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// reverse the elements of the list
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list_t *reverse_list(list_t *list) {
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list_t *reversed_list = (list_t *)malloc(sizeof(list_t) + list->length * sizeof(list_element_t));
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if (!reversed_list) {
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return NULL;
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}
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reversed_list->length = list->length;
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for (size_t i = 0; i < list->length; i++) {
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reversed_list->elements[i] = list->elements[list->length - i - 1];
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}
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return reversed_list;
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}
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// destroy the entire list
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void delete_list(list_t *list) {
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free(list);
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}
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