73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
#include "a_train.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct car* add_car(struct car* first, const char* target) {
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struct car* last = first;
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struct car* newcar = calloc(1, sizeof(struct car));
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strcpy(newcar->value, target);
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if (last != NULL) {
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struct car* current = last;
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while (current->next != NULL) {
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current = current->next;
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}
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current->next = newcar;
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} else {
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last = newcar;
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return last;
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}
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return first;
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}
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void print_train(struct car* first) {
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if(first != NULL){
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struct car* current = first;
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while(current->next != NULL){
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printf("%s\n", current->value);
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current = current->next;
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}
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}
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}
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void cancel_train(struct car* first) {
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struct car* current = first;
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while(first != NULL){
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current = current->next;
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free(first);
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first = current;
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}
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}
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struct car* clear_train(struct car* first, const char* target) {
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if (first == NULL) {
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return NULL;
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}
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struct car* current = first;
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struct car* previous = NULL;
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while (current != NULL && strcmp(current->value, target) == 0) {
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struct car* temp = current;
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first = current->next;
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current = first;
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free(temp);
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}
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while (current != NULL) {
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if (strcmp(current->value, target) == 0) {
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previous->next = current->next;
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free(current);
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current = previous->next;
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} else {
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previous = current;
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current = current->next;
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}
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}
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return first;
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}
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