refresh

du6/list_ops.c

@@ -2,3 +2,90 @@
 #include <stdlib.h>
 #include "list_ops.h"
 
+list_t *new_list(size_t length, list_element_t elements[]) {
+    list_t *list = malloc(sizeof(list_t) + length * sizeof(list_element_t));
+    if (!list) { 
+    return NULL;
+    }
+    list->length = length;
+
+    for (size_t i = 0; i < length; i++) {
+        list->elements[i] = elements[i];
+    }
+
+    return list;
+}
+
+list_t *new_list(size_t length, list_element_t elements[]) {
+    list_t *result = malloc(sizeof(list_t) + sizeof(list_element_t) * length);
+    if (result == NULL) {
+        return NULL;
+    }
+    result->length = length;
+
+    if (elements != NULL) {
+        for (size_t idx = 0; idx < length; ++idx) {
+            result->elements[idx] = elements[idx];
+        }
+    }
+
+    return result;
+}
+
+void delete_list(list_t *lst) {
+    if (lst != NULL) {
+        free(lst);
+    }
+}
+
+size_t length_list(list_t *lst) {
+    return (lst == NULL) ? 0 : lst->length;
+}
+
+list_t *append_list(list_t *first, list_t *second) {
+    size_t a = first ? first->length : 0;
+    size_t b = second ? second->length : 0;
+
+    size_t total = a + b;
+    list_t *joined = malloc(sizeof(list_t) + total * sizeof(list_element_t));
+    if (!joined) { 
+        return NULL;
+    }
+    joined->length = total;
+
+    for (size_t i = 0; i < a; i++) {
+        joined->elements[i] = first->elements[i];
+    }
+
+    for (size_t j = 0; j < b; j++) {
+        joined->elements[a + j] = second->elements[j];
+    }
+
+    return joined;
+}
+
+list_t *filter_list(list_t *list, bool (*filter)(list_element_t)) {
+    size_t count = 0;
+    for (size_t i = 0; i < list->length; i++) {
+        if (filter(list->elements[i])) {
+            count++;
+        }
+    }
+
+    list_t *new = malloc(sizeof(list_t) + count * sizeof(list_element_t));
+    if (!new) { 
+    return NULL;
+    }
+    new->length = count;
+
+    size_t j = 0;
+    for (size_t i = 0; i < list->length; i++) {
+        if (filter(list->elements[i])) {
+            new->elements[j++] = list->elements[i];
+        }
+    }
+
+    return new;
+}
+
+