49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
#include "list_ops.h"
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#include <string.h>
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list_t *new_list(size_t length, list_element_t elements[]) {
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list_t *list = malloc(sizeof(list_t) + sizeof(list_element_t) * length);
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if (!list) return NULL;
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list->length = length;
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if (elements && length > 0) {
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memcpy(list->elements, elements, sizeof(list_element_t) * length);
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}
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return list;
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}
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list_t *append_list(list_t *list1, list_t *list2) {
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size_t len1 = list1 ? list1->length : 0;
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size_t len2 = list2 ? list2->length : 0;
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list_t *result = malloc(sizeof(list_t) + sizeof(list_element_t) * (len1 + len2));
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if (!result) return NULL;
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result->length = len1 + len2;
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if (len1 > 0)
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memcpy(result->elements, list1->elements, sizeof(list_element_t) * len1);
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if (len2 > 0)
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memcpy(result->elements + len1, list2->elements, sizeof(list_element_t) * len2);
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return result;
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}
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list_t *filter_list(list_t *list, bool (*filter)(list_element_t)) {
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if (!list || list->length == 0) return new_list(0, NULL);
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list_element_t *temp = malloc(sizeof(list_element_t) * list->length);
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if (!temp) return NULL;
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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 *result = new_list(count, temp);
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free(temp);
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return result;
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}
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size_t length_list(list_t *list) {
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return list ? list->length : 0;
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} |